Filed Pursuant to Rule 424(b)(2)

Registration Statement No.: 333-289542

PROSPECTUS SUPPLEMENT

$100,000,000

Common Shares

We have entered into a sales agreement, dated August 12, 2025 (Sales Agreement), with TD Securities (USA) LLC (TD Cowen), relating to our common shares offered by this prospectus supplement. In accordance with the terms of the Sales Agreement, we may offer and sell our common shares having an aggregate offering price of up to $100,000,000 from time to time through TD Cowen. No common shares will be offered or sold pursuant to the Sales Agreement in Canada, to anyone known to be a resident of Canada or on or through the facilities of any exchange or trading market in Canada, and there will be no solicitations or advertising activities undertaken in Canada in connection with this offering.

Our common shares are listed on The Nasdaq Capital Market under the symbol “DMAC.” On August 19, 2025, the last reported sale price of our common shares on The Nasdaq Capital Market was $5.76 per share.

Sales of our common shares, if any, under this prospectus supplement and the accompanying prospectus will be made in negotiated transactions, including block trades or block sales, or by any method permitted by law deemed to be an “at the market offering” as defined in Rule 415 promulgated under the Securities Act of 1933, as amended (Securities Act), including without limitation sales made through The Nasdaq Capital Market or on any other trading market for our common shares, or by any other method permitted by law. TD Cowen is not required to sell any specific amount of securities, but will act as our sales agent using commercially reasonable efforts consistent with its normal trading and sales practices, on mutually agreed terms between TD Cowen and us. There is no arrangement for funds to be received in any escrow, trust or similar arrangement.

The compensation to TD Cowen for sales of common shares sold pursuant to the Sales Agreement will be an amount up to 3.0% of the gross proceeds of any common shares sold under the Sales Agreement. In connection with the sale of our common shares on our behalf, TD Cowen will be deemed to be an “underwriter” within the meaning of the Securities Act and the compensation of TD Cowen will be deemed to be underwriting commissions or discounts. We have also agreed to provide indemnification and contribution to TD Cowen with respect to certain liabilities, including liabilities under the Securities Act or the Securities Exchange Act of 1934, as amended (Exchange Act).

We are a “smaller reporting company” as defined under Rule 405 of the Securities Act and, as such, we have elected to comply with certain reduced public company reporting requirements.

Our business and an investment in our common shares involve significant risks. These risks are described under the caption “Risk Factors” beginning on page S-9 of this prospectus supplement, as well as those risk factors described in the documents incorporated by reference into this prospectus supplement.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

TD Cowen

August 22, 2025 

TABLE OF CONTENTS

ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement is part of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission (SEC), using a “shelf” registration process. To the extent there is a conflict between the information contained in this prospectus supplement and the information contained in the accompanying prospectus or any document incorporated by reference herein or therein filed prior to the date of this prospectus supplement, you should rely on the information in this prospectus supplement; provided that if any statement in one of these documents is inconsistent with a statement in another document having a later date – for example, a document incorporated by reference in the accompanying prospectus – the statement in the document having the later date modifies or supersedes the earlier statement.

We further note that the representations, warranties and covenants made by us in any agreement that is filed as an exhibit to any document that is incorporated by reference herein were made solely for the benefit of the parties to such agreement, including, in some cases, for the purpose of allocating risk among the parties to such agreements, and should not be deemed to be a representation, warranty or covenant to you. Moreover, such representations, warranties or covenants were accurate only as of the date when made. Accordingly, such representations, warranties and covenants should not be relied on as accurately representing the current state of our affairs.

We have not, and TD Cowen has not, authorized any other person to provide any information other than that contained or incorporated by reference into this prospectus supplement, the accompanying prospectus or in any free writing prospectus prepared by or on behalf of us or to which we have referred you. We and TD Cowen take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. You should not assume that the information contained in this prospectus supplement or the accompanying prospectus is accurate as of any date other than the date of this prospectus supplement or the accompanying prospectus, or that information contained in any document incorporated or deemed to be incorporated by reference is accurate as of any date other than the date of that document. Our business, financial condition, results of operations and prospects may have changed since that date. You should read this prospectus supplement, the accompanying prospectus, the documents incorporated by reference in this prospectus supplement and the accompanying prospectus, and any free writing prospectus that we have authorized for use in connection with this offering, in their entirety before making an investment decision. You should also read and consider the information in the documents to which we have referred you in the sections of this prospectus supplement entitled “Where You Can Find More Information” and “Incorporation of Certain Information by Reference.”

We are offering to sell, and seeking offers to buy, our common shares only in jurisdictions where offers and sales are permitted. The distribution of this prospectus supplement and the accompanying prospectus and the offering of the common shares in certain jurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus supplement and the accompanying prospectus must inform themselves about, and observe any restrictions relating to, the offering of the common shares and the distribution of this prospectus supplement and the accompanying prospectus outside the United States. This prospectus supplement and the accompanying prospectus do not constitute, and may not be used in connection with, an offer to sell, or a solicitation of an offer to buy, any securities offered by this prospectus supplement and the accompanying prospectus by any person in any jurisdiction in which it is unlawful for such person to make such an offer or solicitation.

Except as otherwise indicated herein or as the context otherwise requires, references in this prospectus supplement to “DiaMedica,” “DMAC,” “the Company,” “we,” “us,” and “our” or similar references mean DiaMedica Therapeutics Inc. and its subsidiaries. References in this prospectus supplement to “voting common shares” or “common shares” refer to our voting common shares, without par value per share. This prospectus supplement and the information incorporated herein by reference include trademarks, service marks and trade names owned by us or other companies. All trademarks, service marks and trade names included or incorporated by reference herein are the property of their respective owners. Use or display by us of trademarks, service marks or trade names owned by others is not intended to and does not imply a relationship between us and, or endorsement or sponsorship by, the owners of the trademarks, service marks or trade names.

All references in this prospectus supplement to “$,” “U.S. Dollars” and “dollars” are to United States dollars.

In addition to the industry, market and competitive position data referenced in this prospectus supplement from our own internal estimates and research, some market data and other statistical information included in this prospectus supplement are based in part upon information obtained from third-party industry publications, research, surveys and studies, none of which we commissioned. Third-party industry publications, research, surveys and studies generally indicate that their information has been obtained from sources believed to be reliable, although they do not guarantee the accuracy or completeness of such information.

We are responsible for all of the disclosure in this prospectus supplement and while we believe that each of the publications, research, surveys and studies included in this prospectus supplement are prepared by reputable sources, we have not, and TD Cowen has not, independently verified market and industry data from third-party sources. In addition, while we believe our internal company research and estimates are reliable, such research and estimates have not been verified by independent sources. Assumptions and estimates of our and our industry’s future performance are necessarily subject to a high degree of uncertainty and risk due to a variety of factors, including those described in “Risk Factors.” These and other factors could cause our future performance to differ materially from our assumptions and estimates. See “Cautionary Note Regarding Forward-Looking Statements.”

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Statements contained in or incorporated by reference into this prospectus supplement that are not descriptions of historical facts are forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995 that are based on management’s current expectations and are subject to risks and uncertainties that could negatively affect our business, operating results, financial condition and common share price. We have attempted to identify forward-looking statements by terminology including “anticipates,” “believes,” “can,” “continue,” “could,” “estimates,” “expects,” “intends,” “may,” “plans,” “potential,” “predicts,” “should,” “will,” “would,” the negative of these terms or other comparable terminology, and the use of future dates.

The forward-looking statements in or incorporated by reference into this prospectus supplement may include, among other things, statements about:

These forward-looking statements are subject to a number of risks, uncertainties and assumptions, including those described under “Risk Factors” in this prospectus supplement and the documents incorporated herein (including in our most recent Annual Report on Form 10-K and any subsequent Quarterly Reports on Form 10-Q). Moreover, we operate in a very competitive and rapidly-changing environment. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this prospectus supplement may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements. Forward-looking statements should not be relied upon as predictions of future events. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee that the future results, levels of activity, performance or events and circumstances reflected in the forward-looking statements will be achieved or occur. Except as required by law, including the securities laws of the United States, we do not intend to update any forward-looking statements to conform these statements to actual results or to changes in our expectations.

 

Our product development pipeline is as follows:

 

 

1.  Investigator sponsored trial

 

We are developing DM199 to address two major critical unmet needs. In PE, there are currently no approved agents in any global market to safely lower maternal blood pressure and/or reduce the risk of fetal growth restriction. Historically, the major issue with potential PE treatments has been that traditional vasodilators commonly used to reduce essential hypertension (e.g., beta-blockers, angiotensin converting enzyme inhibitors (ACEi)) can readily cross the placental barrier and enter into the fetal circulation and cause harm to the developing fetus. We believe that DM199 is uniquely suited to treat PE since its molecular size, ~26 kilodaltons (KD), is typically too large to cross the placental barrier and therefore may reduce blood pressure and enhance microcirculatory perfusion to the maternal organs and placenta without entering fetal circulation. Additionally, we believe DM199 has the potential to not only address hypertension of PE, but also to confer disease modifying outcomes for both maternal and perinatal outcomes, including fetal growth restriction. In AIS, up to 80% of AIS patients are not eligible for treatment with currently approved clot-busting (thrombolytic) drugs or catheter-based clot removal procedures (mechanical thrombectomy). DM199 is intended to enhance collateral blood flow and boost neuronal survival in the ischemic penumbra by inhibiting neuronal cell death (apoptosis) and promoting neuronal remodeling and neoangiogenesis, and accordingly, offer a potential treatment option for AIS patients who otherwise have no therapeutic options.

 

Preeclampsia Program and Phase 2 Investigator-Sponsored Study

 

Our clinical development program in PE currently centers around an investigator-sponsored safety, tolerability and pharmacodynamic, proof-of-concept Phase 2 study in PE patients. This Phase 2 study consists of three studies in PE (Part 1a, dose-escalation; Part 1b, dose-expansion; and Part 2, expectant management) and a fourth study in fetal growth restriction (FGR, Part 3, expectant management). Part 1a topline study results are intended to identify a suitable dose for Parts 1b, 2, and 3. Up to 90 women with PE and potentially an additional 30 subjects with fetal growth restriction may be evaluated. The first subject in Part 1a was enrolled in the fourth quarter of 2024 and interim results from Part 1a of the study were released in July 2025. The interim results (N=28 subjects) demonstrate that DM199 appears safe and well-tolerated with clinically-relevant pharmacodynamic activity with no evidence of placental transfer. Additionally, subjects exhibited rapid, statistically significant reductions in blood pressure with duration of effect that was sustained up to 24 hours post-infusion compared to pre-treatment baseline, a durable effect extending up to 24 hours post-infusion. Preparations are underway to initiate Part 1b where up to 30 subjects with PE and expected delivery within 72 hours will be treated with a dose regimen identified from Part 1a.

 

Based in part upon these interim results, we believe DM199 has the potential to lower blood pressure, enhance endothelial health and improve perfusion to maternal organs and the placenta. We have completed studies on fertility, embryofetal development and pre- and post-natal development in animal models, which support the potential safety of DM199 in pregnant humans. Additionally, based on the strength of the interim results, DiaMedica plans to submit an Investigational New Drug (IND) application in the United States in the second half of 2025.

 

RISK FACTORS

An investment in our common shares involves a high degree of risk. Before making an investment decision, you should carefully consider the following risks and the risks described in the “Risk Factors” section of our most recent Annual Report on Form 10-K and in any subsequent Quarterly Reports on Form 10-Q or Current Reports on Form 8-K, together with all other information contained in this prospectus supplement, the accompanying prospectus and in our filings with the SEC that we have incorporated by reference in this prospectus supplement, as well as any amendment or update to our risk factors reflected in subsequent filings with the SEC. The occurrence of any of the events described below could have a material adverse effect on our business, financial condition, results of operations, cash flows, prospects or the value of our common shares. These risks are not the only ones that we face. Additional risks not currently known to us or that we currently deem immaterial also may impair our business. Please also read carefully the section below titled “Cautionary Note Regarding Forward-Looking Statements.”

Risks Related to this Offering and Our Common Shares

The price of our common shares has been volatile and may continue to be volatile.

Our common shares trade on The Nasdaq Capital Market under the trading symbol “DMAC.” From January 2, 2024 to June 30, 2025, the sale price of our common shares ranged from $2.16 to $6.82 per share. A number of factors could influence the volatility in the market price of our common shares, including changes in the economy or in the financial markets, industry related developments, such as a general decline in the biotechnology sector, and the impact of material events and changes in our operations, such as the pursuit of an IND application for further clinical trials in PE, operating results and financial condition. Each of these factors could lead to increased volatility in the market price of our common shares. In addition, the market prices of the securities of our competitors may also lead to fluctuations in the trading price of our common shares.

We do not have a history of a very active trading market for our common shares.

From January 2, 2024 to June 30, 2025, the daily trading volume of our common shares ranged from 24,100 shares to 3,185,200 shares. Although we anticipate a more active trading market for our common shares in the future, due in part to our June 2025 inclusion in the Russel 2000 Index, we can give no assurance that a more active trading market will develop or be sustained. If we do not have an active trading market for our common shares, it may be difficult for you to sell our common shares at a favorable price or at all.

If you purchase common shares in this offering, you may experience immediate and substantial dilution of your investment.

The offering price per share in this offering may exceed the net tangible book value per share of our common shares. Assuming that an aggregate of 17,361,111 shares are sold at a price of $5.76 per share, the last reported sale price of our common shares on The Nasdaq Capital Market on August 19, 2025, for aggregate gross proceeds to us of $100.0 million, and after deducting commissions and estimated offering expenses payable by us, you will experience immediate dilution of $3.70 per share, representing the difference between our as adjusted net tangible book value per share as of June 30, 2025 after giving effect to this offering and the assumed offering price. See the section titled “Dilution” in this prospectus supplement for a more detailed discussion of the dilution you will incur if you participate in this offering.

Future sales and issuances of our common shares or rights to purchase our common shares could result in additional dilution of our shareholders and could cause our stock price to fall.

Additional capital will likely be needed in the future to continue our planned operations. To the extent we raise additional capital through the sale of equity or convertible debt securities, the ownership interests of our shareholders will be diluted. In addition, as of June 30, 2025, we had outstanding options to purchase 6,311,194 common shares, deferred share units representing 164,770 common shares, restricted share units representing 7,607 common shares and 1,112,419 common shares reserved for future issuance in connection with future grants under the 2019 Plan and the 2021 Plan and options to purchase 374,410 common shares and deferred share units representing 9,745 common shares under our Prior Plan and Prior DSU Plan. If these or any future outstanding options or deferred share units are exercised or otherwise converted into our common shares at prices below the price you pay for our common shares in this offering, you will experience additional dilution.

The actual number of shares we will issue under the Sales Agreement, at any one time or in total, is uncertain.

Subject to certain limitations in the Sales Agreement and compliance with applicable law, we have the discretion to deliver a placement notice to TD Cowen at any time throughout the term of the Sales Agreement. The number of shares that are sold by TD Cowen after delivering a placement notice will fluctuate based on a number of factors, including the market price of our common shares during the sales period, any limits we set with TD Cowen in any applicable placement notice and the demand for our common shares. Because the price per share of each share sold will fluctuate during the sales period, it is not possible at this stage to predict the number of shares that will be sold or the aggregate proceeds to be raised in connection with those sales, if any.

The common shares offered hereby will be sold in “at the market offerings,” and investors who buy shares at different times will likely pay different prices.

Investors who purchase shares in this offering at different times will likely pay different prices, and so may experience different outcomes in their investment results. We will have discretion, subject to market demand, to vary the timing, prices and numbers of shares sold, and, subject to any restrictions we may place in any applicable placement notice, there is no minimum or maximum sales price. Investors may experience a decline in the value of their shares as a result of share sales made at prices lower than the prices they paid.

We are a “smaller reporting company,” and because we have opted to use the reduced disclosure requirements available to us, certain investors may find investing in our common shares less attractive.

We are currently a “smaller reporting company” under the federal securities laws and, as such, are subject to scaled disclosure requirements afforded to such companies. For example, as a smaller reporting company, we may choose to present only the two most recent fiscal years of audited financial statements in our Annual Report on Form 10-K, and we are subject to reduced executive compensation disclosure requirements. Our shareholders and investors may find our common shares less attractive as a result of our status as a “smaller reporting company” and our reliance on the reduced disclosure requirements afforded to these companies. If some of our shareholders or investors find our common shares less attractive as a result, there may be a less active trading market for our common shares and the market price of our common shares may be more volatile. 

If securities or industry analysts do not continue to publish research or reports about our business, or publish negative reports about our business, the market price of our common shares and trading volume could decline.

The market price and trading volume for our common shares will depend in part on the research and reports that securities or industry analysts publish about us or our business. We do not have any control over the reporting of these analysts. There can be no assurance that analysts will continue to cover us or provide favorable coverage. If one or more of the analysts who cover us downgrade our common shares or negatively change their opinion of our common shares, the market price of our common shares would likely decline. If one or more of these analysts cease coverage of our Company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which could cause the market price of our common shares or trading volume to decline.

We could be subject to securities class action litigation, which is expensive and could divert management attention.

In the past, securities class action litigation has often been brought against a company following a significant decline in the market price of its securities. This risk is especially relevant for us because biopharmaceutical companies have experienced significant stock price volatility in recent years. If we face such litigation, it could result in substantial costs and a diversion of management’s attention and our resources, which could harm our business. This is particularly true in light of our limited securities litigation insurance coverage.

We have broad discretion over the use of our cash, cash equivalents and marketable securities, including the net proceeds we receive in this offering, and may not use them effectively.

Our management has broad discretion to use our cash, cash equivalents and marketable securities, including the net proceeds we receive in this offering, to fund our operations and could spend these funds in ways that do not improve our results of operations or enhance the value of our common shares. The failure by our management to apply these funds effectively could result in financial losses that could have a material adverse effect on our business, cause the price of our common shares to decline and delay the development of our product candidate. Pending their use to fund operations, we may invest our cash, cash equivalents and marketable securities in a manner that does not produce income or that loses value.

Subsequent trials may fail to replicate promising data seen in earlier preclinical studies and clinical trials.

Interim data from the ongoing Part 1a portion of the investigator-sponsored Phase 2 study of DM199 for the treatment of preeclampsia provided promising results. However, promising results in our preclinical studies or clinical trials may not be replicated in ongoing and future studies or trials, and the final data analysis may differ from interim data analysis.

Even if ongoing and future trials of DM199 are conducted and completed as planned, the results may not replicate the promising results seen in preclinical studies and early clinical studies or meet the primary or secondary endpoints, or otherwise not prove sufficient to obtain regulatory approval or result in a restricted product label that could negatively impact commercialization. Success in preclinical testing does not ensure success in clinical trials, and success in early stage clinical trials does not ensure success in later clinical trials. This can be due to a variety of reasons, including variations in patient populations, or the inability of certain patients to complete all assessments required by the clinical trial protocol, adjustments to clinical trial protocols or designs as compared to earlier testing or trials, variations in the data that could produce inconclusive or uninterpretable results, or the use of additional trial sites or investigators.

Furthermore, if we fail to replicate the promising results from our preclinical studies or clinical trials in ongoing or future clinical trials, we may be unable to successfully develop, obtain regulatory approval for and commercialize our current or future product candidates.

USE OF PROCEEDS

We may issue and sell our common shares having aggregate sales proceeds of up to $100,000,000 from time to time. Because there is no minimum offering amount required as a condition to close this offering, the actual total public offering amount, commissions and proceeds to us, if any, are not determinable at this time. There can be no assurance that we will be able to sell any common shares under or fully utilize the Sales Agreement with TD Cowen.

We intend to use the net proceeds from this offering to continue our clinical and product development activities for DM199 in preeclampsia and general corporate purposes.

The amounts and timing of our use of the net proceeds from this offering will depend on a number of factors, such as the timing, progress and results of our clinical trials, regulatory requirements, the timing and progress of any partnering efforts, technological advances and the competitive environment for our products. As of the date of this prospectus supplement, we cannot specify with certainty all of the particular uses for the net proceeds to us from the sale of our common shares offered by us hereunder. Accordingly, our management will have broad discretion in the timing and application of these proceeds.

Pending the uses described above, we intend to deposit the proceeds in our non-interest bearing checking account Unless otherwise indicated in the applicable prospectus supplement, we intend to use the net proceeds from the sale of securities and any exercise of warrants under this prospectus and the applicable prospectus supplement to continue our clinical and product development activities and for other working capital and general corporate purposes. The prospectus supplement relating to a particular offering of securities by us will identify the use of proceeds for that offering. We may find it necessary or advisable to use the net proceeds for other purposes, and we will have broad discretion in the application of the proceeds. Pending the uses described above, we intend to deposit the proceeds in our non-interest bearing checking account or interest bearing money market fund or invest them in short-term or marketable securities until we use them for their stated purpose.

DIVIDEND POLICY

We have never declared or paid any cash dividends on our common shares and do not anticipate paying any cash dividends in the foreseeable future. We expect to retain our future earnings, if any, for use in the operation and expansion of our business. Additionally, we may in the future become subject to contractual restrictions on, or prohibitions against, the payment of dividends. Subject to the foregoing, the payment of cash dividends in the future, if any, will be at the discretion of our Board of Directors and will depend upon such factors as earnings levels, capital requirements, our overall financial condition and any other factors deemed relevant by our Board of Directors. As a result, our shareholders will likely need to sell their common shares to realize a return on their investment and may not be able to sell their common shares at or above the price paid for them.

DILUTION

If you invest in our common shares in this offering, your ownership interest will be immediately diluted to the extent of the difference between the public offering price per common share and the as adjusted net tangible book value per share of our common shares immediately after this offering. Net tangible book value per common share is determined at any date by subtracting our total liabilities from the amount of our total tangible assets (total assets less intangible assets) and dividing the difference by the number of our common shares deemed to be outstanding at that date.

Our net tangible book value as of June 30, 2025 was approximately $27.2 million, or $0.63 per common share, based on 43,072,488 common shares outstanding as of June 30, 2025. After giving effect to the sale of our common shares in the aggregate amount of $100.0 million in this offering at an assumed offering price of $5.76 per common share, the last reported sale price of our common shares on The Nasdaq Capital Market on August 19, 2025, and after deducting commissions and estimated offering expenses payable by us, our as adjusted net tangible book value as of June 30, 2025 would have been $124.7 million, or $2.06 per common share. This amount represents an immediate increase in net tangible book value of $1.43 per common share to existing shareholders and an immediate dilution in net tangible book value of $3.70 per common share to new investors purchasing common shares in this offering.

The following table illustrates this dilution on a per common share basis:

The table above assumes for illustrative purposes that an aggregate of 17,361,111 common shares are sold at a price of $5.76 per share, the last reported sale price of our common shares on The Nasdaq Capital Market on August 19, 2025, for aggregate gross proceeds of $100.0 million. The common shares sold in this offering, if any, will be sold from time to time at various prices.

The number of our common shares to be outstanding after this offering is based on 43,072,488 common shares outstanding as of June 30, 2025, and excludes as of that date the following:

The number of our common shares to be outstanding after this offering also excludes 8,606,425 shares issued and 1,000,000 common shares reserved for future issuance in connection with future grants under the 2021 Plan subsequent to June 30, 2025 through August 20, 2025.

PLAN OF DISTRIBUTION

We have entered into a Sales Agreement with TD Cowen, under which we may issue and sell from time to time up to $100,000,000 of our common shares through or to TD Cowen as our sales agent or principal. Sales of our common shares, if any, will be made in negotiated transactions, including block trades or block sales, or by any method permitted by law deemed to be an “at the market offering” as defined in Rule 415 under the Securities Act, including without limitation sales made through Nasdaq or on any other existing trading market for our common shares, or by any other method permitted by law. Sales pursuant to the Sales Agreement may be made through an affiliate of TD Cowen. No common shares will be offered or sold pursuant to the Sales Agreement in Canada, to anyone known to be a resident of Canada or on or through the facilities of any exchange or trading market in Canada, and there will be no solicitations or advertising activities undertaken in Canada in connection with this offering.

TD Cowen will offer our common shares subject to the terms and conditions of the Sales Agreement on a daily basis or as otherwise agreed upon by us and TD Cowen. We will designate the maximum amount of common shares to be sold through TD Cowen on a daily basis or otherwise determine such maximum amount together with TD Cowen. Subject to the terms and conditions of the Sales Agreement, TD Cowen will use its commercially reasonable efforts to sell on our behalf all of the common shares requested to be sold by us. We may instruct TD Cowen not to sell common shares if the sales cannot be effected at or above the price designated by us in any such instruction. TD Cowen or we may suspend the offering of our common shares being made through TD Cowen under the Sales Agreement upon proper notice to the other party. TD Cowen and we each have the right, by giving written notice as specified in the Sales Agreement, to terminate the Sales Agreement in each party’s sole discretion at any time.

The aggregate compensation payable to TD Cowen as sales agent equals up to 3.0% of the gross sales price of the common shares sold through it pursuant to the Sales Agreement. We have also agreed to reimburse TD Cowen up to $75,000 of TD Cowen’s actual outside legal expenses incurred by TD Cowen in connection with the execution of the Sales Agreement, in addition to certain ongoing disbursements of its legal counsel. We estimate that the total expenses of the offering payable by us, excluding commissions payable to TD Cowen under the Sales Agreement, will be approximately $150,000.

The remaining sales proceeds, after deducting any expenses payable by us and any transaction fees imposed by any governmental, regulatory, or self-regulatory organization in connection with the sales, will equal our net proceeds for the sale of such common shares.

TD Cowen will provide written confirmation to us following the close of trading on The Nasdaq Capital Market on each day in which common shares are sold through it as sales agent under the Sales Agreement. Each confirmation will include the number of common shares sold through it as sales agent on that day, the volume weighted average price of the common shares sold, the percentage of the daily trading volume and the net proceeds to us.

We will report at least quarterly the number of common shares sold through TD Cowen under the Sales Agreement and the net proceeds to us in connection with the sales of common shares.

Settlement for sales of common shares will occur, unless the parties agree otherwise, on the first business day that is also a trading day following the date on which any sales were made in return for payment of the net proceeds to us. There is no arrangement for funds to be received in an escrow, trust or similar arrangement.

In connection with the sales of our common shares on our behalf, TD Cowen will be deemed to be an “underwriter” within the meaning of the Securities Act, and the compensation paid to TD Cowen will be deemed to be underwriting commissions or discounts. We have agreed in the Sales Agreement to provide indemnification and contribution to TD Cowen against certain liabilities, including liabilities under the Securities Act. As sales agent, TD Cowen will not engage in any transactions that stabilizes our common shares.

Our common shares are listed on The Nasdaq Capital Market and trades under the symbol “DMAC.” The transfer agent of our common shares is Computershare Investor Services.

TD Cowen and/or its affiliates have provided, and may in the future provide, various investment banking and other financial services for us for which services they have received and, may in the future receive, customary fees.

CERTAIN UNITED STATES INCOME TAX CONSIDERATIONS

The following discussion is generally limited to certain material U.S. federal income tax considerations relating to the purchase, ownership and disposition of our common shares by U.S. Holders (as defined below). This discussion applies to U.S. Holders that hold our common shares as capital assets. This summary is for general information purposes only and does not purport to be a complete analysis or listing of all potential U.S. federal income tax considerations that may apply to a U.S. Holder arising from and relating to the acquisition, ownership, and disposition of our common shares. Accordingly, this summary is not intended to be, and should not be construed as, legal or U.S. federal income tax advice with respect to any U.S. Holder. Although this discussion is generally limited to the U.S. federal income tax considerations to U.S. Holders, the U.S. federal income tax treatment of dividends on and gain on sale or exchange of our common shares by certain “Non-U.S. Holders” (as defined below) is included below at “U.S. Federal Income Taxation of Non-U.S. Holders.”

No legal opinion from U.S. legal counsel or ruling from the Internal Revenue Service (IRS) has been requested, or will be obtained, regarding the U.S. federal income tax consequences of the acquisition, ownership, and disposition of common shares. This summary is not binding on the IRS, and the IRS is not precluded from taking a position that is different from, and contrary to, the positions presented in this summary. In addition, because the guidance on which this summary is based is subject to various interpretations, the IRS and the U.S. courts could disagree with one or more of the positions described in this summary.

This discussion is based on the U.S. Internal Revenue Code of 1986, as amended (Code), U.S. Treasury regulations promulgated thereunder and administrative and judicial interpretations thereof, and the income tax treaty between the United States and Canada (Convention), all as in effect on the date hereof and all of which are subject to change, possibly with retroactive effect. This summary is applicable to U.S. Holders who are residents of the United States for purposes of the Convention and who qualify for the full benefits of the Convention. This summary does not discuss the potential effects, whether adverse or beneficial, of any proposed legislation. Each prospective investor is responsible for monitoring developments with their own tax advisors, we do not undertake to update any of the information in this summary based on any change in law after the effective date hereof, including any change that may have retroactive effect.

This discussion does not address all of the U.S. federal income tax considerations that may be relevant to specific U.S. Holders in light of their particular circumstances or to U.S. Holders subject to special treatment under U.S. federal income tax law (such as certain financial institutions, insurance companies, broker-dealers and traders in securities or other persons that generally mark their securities to market for U.S. federal income tax purposes, tax-exempt entities, retirement plans, regulated investment companies, real estate investment trusts, certain former citizens or residents of the United States, persons who hold common shares as part of a “straddle,” “hedge,” “conversion transaction,” “synthetic security” or integrated investment, persons that have a “functional currency” other than the U.S. dollar, persons that own (or are deemed to own) 10% or more (by voting power or value) of our common shares, persons that acquire their common shares as part of a compensation arrangement, corporations that accumulate earnings to avoid U.S. federal income tax, partnerships and other pass-through entities, and investors in such pass-through entities). This discussion does not address any U.S. state or local or non-U.S. tax considerations or any U.S. federal estate, gift or alternative minimum tax considerations. In addition, except as specifically set forth below, this summary does not discuss applicable tax reporting requirements.

As used in this discussion, the term “U.S. Holder” means a beneficial owner of common shares that is, for U.S. federal income tax purposes, (1) an individual who is a citizen or resident of the United States, (2) a corporation (or entity treated as a corporation for U.S. federal income tax purposes) created or organized in or under the laws of the United States, any state thereof, or the District of Columbia, (3) an estate the income of which is subject to U.S. federal income tax regardless of its source or (4) a trust (x) with respect to which a court within the United States is able to exercise primary supervision over its administration and one or more United States persons have the authority to control all of its substantial decisions or (y) that has elected under applicable U.S. Treasury regulations to be treated as a domestic trust for U.S. federal income tax purposes.

If an entity treated as a partnership for U.S. federal income tax purposes holds the common shares, the U.S. federal income tax considerations relating to an investment in the common shares will depend in part upon the status and activities of such entity and the particular partner. Any such entity should consult its own tax advisor regarding the U.S. federal income tax considerations applicable to it and its partners of the purchase, ownership and disposition of the common shares.

Persons holding common shares should consult their own tax advisors as to the particular tax considerations applicable to them relating to the purchase, ownership and disposition of common shares, including the applicability of U.S. federal, state and local tax laws and non-U.S. tax laws.

Distributions

Subject to the discussion below under “Passive Foreign Investment Company Considerations,” a U.S. Holder that receives a distribution with respect to the common shares generally will be required to include the gross amount of such distribution (before reduction for any Canadian withholding taxes) in gross income as a dividend when actually or constructively received to the extent of the U.S. Holder’s pro rata share of our current and/or accumulated earnings and profits (as determined under U.S. federal income tax principles). To the extent a distribution received by a U.S. Holder is not a dividend because it exceeds the U.S. Holder’s pro rata share of our current and accumulated earnings and profits, it will be treated first as a tax-free return of capital and reduce (but not below zero) the adjusted tax basis of the U.S. Holder’s common shares. To the extent the distribution exceeds the adjusted tax basis of the U.S. Holder’s common shares, the remainder will be taxed as capital gain. However, we cannot provide any assurance that we will maintain or provide earnings and profits determinations in accordance with U.S. federal income tax principles. Therefore, U.S. Holders should expect that a distribution will generally be treated as a dividend even if that distribution would otherwise be treated as a non-taxable return of capital or as capital gain under the rules described above.

The U.S. dollar value of any distribution on the common shares made in Canadian dollars generally should be calculated by reference to the exchange rate between the U.S. dollar and the Canadian dollar in effect on the date of receipt (or deemed receipt) of such distribution by the U.S. Holder regardless of whether the Canadian dollars so received are in fact converted into U.S. dollars at that time. If the Canadian dollars received are converted into U.S. dollars on the date of receipt (or deemed receipt), a U.S. Holder generally should not recognize currency gain or loss on such conversion. If the Canadian dollars received are not converted into U.S. dollars on the date of receipt (or deemed receipt), a U.S. Holder generally will have a basis in such Canadian dollars equal to the U.S. dollar value of such Canadian dollars on the date of receipt (or deemed receipt). Any gain or loss on a subsequent conversion or other disposition of such Canadian dollars by such U.S. Holder generally will be treated as ordinary income or loss and generally will be income or loss from sources within the United States for U.S. foreign tax credit purposes. Different rules apply to U.S. Holders who use the accrual method of tax accounting. Each U.S. Holder should consult its own U.S. tax advisors regarding the U.S. federal income tax consequences of receiving, owning, and disposing of foreign currency.

Distributions on the common shares that are treated as dividends generally will constitute income from sources outside the United States for foreign tax credit purposes and generally will constitute “passive category income.” Because we are not a United States corporation, such dividends will not be eligible for the “dividends received” deduction generally allowed to corporate shareholders with respect to dividends received from U.S. corporations. Dividends paid by a “qualified foreign corporation” to a U.S. Holder who is an individual, trust or estate will generally be treated as “qualified dividend income” and are eligible for taxation at a reduced capital gains rate rather than the marginal tax rates generally applicable to ordinary income provided that a holding period requirement (more than 60 days of ownership, without protection from the risk of loss, during the 121-day period beginning 60 days before the ex-dividend date) and certain other requirements are met, subject to certain exceptions (including, but not limited to, dividends treated as investment income for purposes of investment interest deduction limitations). However, if we are treated as a “passive foreign investment company” (a PFIC) for the taxable year in which the dividend is paid or the preceding taxable year (see discussion below under “Passive Foreign Investment Company Considerations”), we will not be treated as a qualified foreign corporation, and therefore the reduced capital gains tax rate described above will not apply. Each U.S. Holder is advised to consult its own tax advisors regarding the availability of the reduced tax rate on dividends.

If a U.S. Holder is subject to Canadian withholding tax on dividends paid on the holder’s common shares (see discussion below under “Material Canadian Federal Income Tax Considerations-Dividends”), the U.S. Holder may be eligible, subject to a number of complex limitations, to claim a credit against its U.S. federal income tax for the Canadian withholding tax imposed on the dividends. However, if U.S. persons collectively own, directly or indirectly, 50% or more of the voting power or value of our common shares it is possible that a portion of any dividends we pay will be considered U.S.-source income in proportion to our U.S.-source earnings and profits, which could limit the ability of a U.S. Holder to claim a foreign tax credit for the Canadian withholding taxes imposed in respect of such a dividend, although certain elections may be available under the Code and the Convention to mitigate these effects. A U.S. Holder may claim a deduction for the Canadian withholding tax in lieu of a credit, but only for a year in which the U.S. Holder elects to do so for all creditable foreign income taxes. The rules governing the foreign tax credit are complex. Each U.S. Holder is advised to consult its tax advisor regarding the availability of the foreign tax credit under its particular circumstances.

Sale, Exchange or Other Disposition of Common Shares

Subject to the discussion below under “Passive Foreign Investment Company Considerations,” a U.S. Holder generally will recognize capital gain or loss for U.S. federal income tax purposes upon the sale, exchange or other disposition of common shares. The amount of gain recognized will equal the excess of the amount realized (i.e., the amount of cash plus the fair market value of any property received) over the U.S. Holder’s adjusted tax basis in the common shares sold or exchanged. The amount of loss recognized will equal the excess of the U.S. Holder’s adjusted tax basis in the common shares sold or exchanged over the amount realized. Such capital gain or loss generally will be long-term capital gain or loss if, on the date of sale, exchange or other disposition, the common shares were held by the U.S. Holder for more than one year. Net long-term capital gain derived by a non-corporate U.S. Holder with respect to capital assets is currently subject to tax at reduced rates. The deductibility of a capital loss is subject to significant limitations. Any gain or loss recognized from the sale, exchange or other disposition of common shares will generally be gain or loss from sources within the United States for U.S. foreign tax credit purposes, except as otherwise provided in an applicable income tax treaty and if an election is properly made under the Code.

If common shares are sold, exchanged or otherwise disposed of in a taxable transaction for Canadian dollars or other non-U.S. currency, the amount realized generally will be the U.S. dollar value of the Canadian dollars or other non-U.S. currency received based on the spot rate in effect on the date of sale, taxable exchange or other taxable disposition. If a U.S. Holder is a cash method taxpayer and the common shares are traded on an established securities market, Canadian dollars or other non-U.S. currency paid or received by such U.S. Holder will be translated into U.S. dollars at the spot rate on the settlement date of the sale. An accrual method taxpayer may elect the same treatment with respect to the sale of common shares traded on an established securities market, provided that the election is applied consistently from year to year. Such election cannot be changed without the consent of the IRS. Canadian dollars or other non-U.S. currency received on the sale, taxable exchange or other taxable disposition of common shares generally will have a tax basis equal to its U.S. dollar value as determined pursuant to the rules above. Any gain or loss recognized by a U.S. Holder on a sale, taxable exchange or other taxable disposition of the Canadian dollars or other non-U.S. currency will be ordinary income or loss and generally will be U.S.-source gain or loss.

Passive Foreign Investment Company Considerations

General Rule. For any taxable year in which 75% or more of our gross income is passive income, or at least 50% of the value of our assets (where the value of our total assets is determined based upon the market value of our common shares at the end of each quarter or other measuring period) are held for the production of, or produce, passive income, we would be characterized as a PFIC for U.S. federal income tax purposes. The percentage of a corporation’s assets that produce or are held for the production of passive income generally is determined based upon the average ratio of passive assets to total assets calculated at the end of each measuring period. Calculation of the value of assets at the end of each measuring period is generally made at the end of each of the four quarters that make up the company’s taxable year, unless an election is made to use an alternative measuring period (such as a week or month). The “weighted average” of those periodic values is then used to determine the value of assets for the passive asset test for the taxable year. Assets that produce or are held for the production of passive income generally include cash, even if held as working capital or raised in a public offering, marketable securities and other assets that may produce passive income. However, in proposed regulations section 1.1297-1(d)(2), a limited exception to the passive asset test valuation rules is provided for the treatment of working capital in order to take into account the short-term cash needs of operating companies. This proposed regulation provides that an amount of cash held in a non-interest bearing account that is held for the present needs of an active trade or business and is no greater than the amount reasonably expected to cover 90 days of operating expenses incurred in the ordinary course of the trade or business of the foreign corporation (for example, accounts payable for ordinary operating expenses or employee compensation) is not treated as a passive asset. Taxpayers are permitted to rely on the proposed rule provided they consistently follow the rule for each subsequent taxable year beginning before the date of filing of the Treasury decision adopting the rule as a final regulation. The Treasury Department and the IRS indicated that they continue to study the appropriate treatment of working capital for purposes of the passive asset test.

PFIC Status Determination. The tests for determining PFIC status for any taxable year are dependent upon a number of factors, some of which are beyond our control, including the value of our assets, the market price of our common shares, and the amount and type of our gross income. Based on these tests (i) we believe that we were a PFIC for the taxable year ended December 31, 2016, (ii) we do not believe that we were a PFIC for any of the taxable years ended December 31, 2017 through December 31, 2021, and (iii) we believe that we were a PFIC for the taxable years ended December 31, 2022 through December 31, 2024. Our status as a PFIC is a fact-intensive determination made for each taxable year, and we cannot provide any assurance regarding our PFIC status for the taxable year ending December 31, 2025 or for future taxable years. U.S. shareholders who own our common shares for any period during which we are a PFIC (which we believe would currently only be those shareholders that held our common shares in the taxable year ended December 31, 2016, December 31, 2022, December 31, 2023 or December 31, 2024) will be required to file IRS Form 8621 for each tax year during which they hold our common shares, unless, after we are no longer a PFIC, any such shareholder makes the “purging election” discussed below.

PFIC Consequences. If we are a PFIC for any year during a non-corporate U.S. shareholder’s holding period of our common shares, and the U.S. shareholder does not make a Qualified Electing Fund election (QEF Election) or a “mark-to-market” election, both as described below, then such non-corporate U.S. shareholder generally will be required to treat any gain realized upon a disposition of our common shares, or any so-called “excess distribution” received on our common shares (generally, any distributions on our common shares in a taxable year that are greater than 125% of the average annual distributions received by such U.S. shareholder in the three preceding taxable years or, if shorter, the U.S. shareholder’s holding period), as ordinary income, rather than as capital gain, and the preferential tax rate applicable to dividends received on our common shares would not be available. This income generally would be allocated over a U.S. shareholder’s holding period with respect to our common shares and the amount allocated to prior years will be subject to tax at the highest tax rate in effect for that year and an interest charge would be imposed on the amount of deferred tax on the income allocated to prior taxable years. Pursuant to the specific provisions of the PFIC rules, a taxpayer may realize gain on the disposition of common shares if the securities are disposed of by a holder whose securities are attributed to the U.S. shareholder, if the securities are pledged as security for a loan, transferred by gift or death, or are subject to certain corporate distributions. Additionally, if we are a PFIC, a U.S. shareholder who acquires our common shares from a decedent would be denied normally available step-up in tax basis for our common shares to fair market value at the date of death but instead would have a tax basis equal to the lower of the fair market value of such common shares or the decedent’s tax basis in such common shares. Proposed regulations, that are not yet effective, address domestic partnerships and S corporations that own stock in a PFIC for which a QEF election or “mark-to-market” election could be made. Currently, only the domestic partnership or S corporation (and not the partners or S corporation shareholders) can make these elections. The proposed regulations would reverse the current rule so that only the partners or S corporation shareholders - not the partnership or S corporation - could make the elections. These proposed regulations would only apply to partnership or S corporation shareholders’ tax years beginning on or after the date they are issued in final form.

QEF Election. A U.S. shareholder may avoid the adverse tax consequences described above by making a timely and effective QEF election. A U.S. shareholder who makes a QEF election generally must report, on a current basis, its share of our ordinary earnings and net capital gains, whether or not we distribute any amounts to our shareholders, and would be required to comply with specified information reporting requirements. Any gain subsequently recognized upon the sale by that U.S. shareholder of the common shares generally would be taxed as capital gain and the denial of the basis step-up at death described above would not apply. The QEF election is available only if the company characterized as a PFIC provides a U.S. shareholder with certain information regarding its earnings and capital gains, as required under applicable U.S. Treasury regulations. We intend to provide all information and documentation that a U.S. shareholder making a QEF election is required to obtain for U.S. federal income tax purposes (e.g., the U.S. shareholder’s pro rata share of ordinary income and net capital gain, and a “PFIC Annual Information Statement” as described in applicable U.S. Treasury regulations).

Mark-to-Market Election. As an alternative to a QEF Election, a U.S. shareholder may also mitigate the adverse tax consequences of PFIC status by timely making a “mark-to-market” election. A U.S. shareholder who makes the mark-to-market election generally must include as ordinary income each year the increase in the fair market value of the common shares and deduct from gross income the decrease in the value of such shares during each of its taxable years. Losses would be allowed only to the extent of the net mark-to-market gain previously included in income under the election. The U.S. shareholder’s adjusted tax basis in the common shares with respect to which the mark-to-market election applies would be adjusted to reflect amounts included in gross income or allowed as a deduction as a result of such election. If a U.S. shareholder makes an effective mark-to-market election, any gain recognized upon the sale or other disposition of our common shares in a year that we are a PFIC will be treated as ordinary income and any loss will be treated first as ordinary loss (to the extent of any net mark-to-market gains for prior years) and thereafter as capital loss. If a mark-to-market election with respect to our common shares is in effect on the date of a U.S. shareholder’s death, the tax basis of the common shares in the hands of a U.S. shareholder who acquired them from a decedent will be the lesser of the decedent’s tax basis or the fair market value of the common shares. A mark-to-market election may be made and maintained only if our common shares are regularly traded on a qualified exchange, including The Nasdaq Capital Market. Whether our common shares are regularly traded on a qualified exchange is an annual determination based on facts that, in part, are beyond our control. Accordingly, a U.S. shareholder might not be eligible to make a mark-to-market election to mitigate the adverse tax consequences if we are characterized as a PFIC.

Election Tax Risks. Certain economic risks are inherent in making either a QEF Election or a mark-to-market election. If a QEF Election is made, it is possible that earned income will be reported to a U.S. shareholder as taxable income and income taxes will be due and payable on such an amount. A U.S. shareholder of our common shares may pay tax on such “phantom” income, i.e., where income is reported to it pursuant to the QEF Election, but no cash is distributed with respect to such income. There is no assurance that any distribution or profitable sale will ever be made regarding our common shares, so the tax liability may result in a net economic loss. A mark-to-market election may result in significant share price gains in one year causing a significant income tax liability. This gain may be offset in another year by significant losses. If a mark-to-market election is made, this highly variable tax gain or loss may result in substantial and unpredictable changes in taxable income. The amount included in income under a mark-to-market election may be substantially greater than the amount included under a QEF election. Both the QEF and mark-to-market elections are binding on the U.S. shareholder for all subsequent years that the U.S. shareholder owns our shares unless permission to revoke the election is granted by the IRS.

Purging Election. Although we generally will continue to be treated as a PFIC as to any U.S. shareholder if we are a PFIC for any year during a U.S. shareholder’s holding period, if we cease to satisfy the requirements for PFIC classification, the U.S. shareholder may avoid PFIC classification for subsequent years if the U.S. shareholder elects to make a so-called “purging election,” by recognizing income, based on the excess distribution regime described above, on the unrealized appreciation in the common shares through the close of the tax year in which we cease to be a PFIC. When a foreign corporation no longer qualifies as a PFIC (due to a change in facts or law), the foreign corporation nonetheless retains its PFIC status with respect to a shareholder unless and until the shareholder makes an election under Code section 1298(b)(1) and regulations section 1.1298-3 (purging election) on IRS Form 8621 attached to the shareholder’s tax return (including an amended return), or requests the consent of the IRS Commissioner to make a late election under Code section 1298(b)(1) and regulations section 1.1298-3(e) (late purging election) on Form 8621-A.

The U.S. federal income tax rules relating to PFICs are very complex. U.S. Holders are urged to consult their own tax advisors with respect to the purchase, ownership and disposition of common shares, the consequences to them of an investment in a PFIC, any elections available with respect to the common shares and the IRS information reporting obligations with respect to the purchase, ownership and disposition of common shares in the event we are considered a PFIC.

Additional Tax on Passive Income

Certain U.S. Holders that are individuals, estates or trusts (other than trusts that are exempt from tax) with adjusted income exceeding certain thresholds, will be subject to a 3.8% tax on all or a portion of their “net investment income,” which includes dividends on the common shares, and net gains from the disposition of the common shares. Further, excess distributions treated as dividends, gains treated as excess distributions, and mark-to-market inclusions and deductions are all included in the calculation of net investment income.

Treasury regulations provide, subject to the election described in the following paragraph, that solely for purposes of this additional tax, that distributions of previously taxed income will be treated as dividends and included in net investment income subject to the additional 3.8% tax. Additionally, to determine the amount of any capital gain from the sale or other taxable disposition of common shares that will be subject to the additional tax on net investment income, a U.S. Holder who has made a QEF election will be required to recalculate its basis in the common shares excluding any QEF election basis adjustments.

Alternatively, a U.S. Holder may make an election which will be effective with respect to all interests in controlled foreign corporations and PFICs that are subject to a QEF election and that are held in that year or acquired in future years. Under this election, a U.S. Holder pays the additional 3.8% tax on QEF election income inclusions and on gains calculated after giving effect to related tax basis adjustments. U.S. Holders that are individuals, estates or trusts should consult their own tax advisors regarding the applicability of this tax to any of their income or gains in respect of the common shares.

U.S. Federal Income Taxation of Non-U.S. Holders

A beneficial owner of our common shares, other than a partnership or entity treated as a partnership for U.S. Federal income tax purposes, that is not a U.S. Holder is referred to herein as a “Non-U.S. Holder”. Non-U.S. Holders generally will not be subject to U.S. federal income tax or withholding tax on dividends received from us with respect to our common shares, unless that income is effectively connected with the Non-U.S. Holder’s conduct of a trade or business within the United States. In general, if the Non-U.S. Holder is entitled to the benefits of certain U.S. income tax treaties with respect to those dividends, that income is taxable only if it is attributable to a permanent establishment or fixed base maintained by the Non-U.S. Holder in the United States.

Non-U.S. Holders generally will not be subject to U.S. federal income tax or withholding tax on any gain realized upon the sale, exchange or other disposition of our common shares, unless:

If the Non-U.S. Holder is engaged in a U.S. trade or business for U.S. federal income tax purposes, the income from the common shares, including dividends and the gain from the sale, exchange or other disposition of the stock, that is effectively connected with the conduct of that U.S. trade or business (and, if required by an applicable income tax treaty, are attributable to a permanent establishment or fixed base in the United States) will generally be subject to regular U.S. federal income tax in the same manner as discussed above relating to the general taxation of U.S. Holders. In addition, if such Non-U.S. Holder is a corporation, its earnings and profits that are attributable to the effectively connected income, which are subject to certain adjustments, may be subject to an additional branch profits tax at a rate of 30%, or at a lower rate as may be specified by an applicable U.S. income tax treaty.

Information Reporting with Respect to Foreign Financial Assets

U.S. individuals (and, under regulations, certain entities) that own “specified foreign financial assets” (as defined in Section 6038D of the Code) with an aggregate fair market value in excess of $50,000 are generally required to file an information report on IRS Form 8938 with respect to such assets with their tax returns. Such U.S. Holders are required to attach a complete IRS Form 8938 to their tax return for each year in which they hold such assets. Significant penalties may apply to persons who fail to comply with these rules. Specified foreign financial assets include not only financial accounts maintained in foreign financial institutions, but also, unless held in accounts maintained by certain financial institutions, any stock or security issued by a non-U.S. person, such as our common shares. The failure to report information required under the current regulations could result in substantial penalties and in the extension of the statute of limitations with respect to federal income tax returns filed by a U.S. Holder. U.S. Holders should consult their own tax advisors regarding the possible implications of these U.S. Treasury regulations for an investment in our common shares.

Special Reporting Requirements for Transfers to Foreign Corporations

A U.S. Holder that acquires common shares generally will be required to file IRS Form 926 with the IRS if (1) immediately after the acquisition such U.S. Holder, directly or indirectly, owns at least 10% of our common shares, or (2) the amount of cash transferred in exchange for common shares during the 12-month period ending on the date of the acquisition exceeds $100,000. Significant penalties may apply for failing to satisfy these filing requirements. U.S. Holders are urged to contact their tax advisors regarding these filing requirements.

Information Reporting and Backup Withholding

For U.S. Holders, dividends on and proceeds from the sale or other disposition of common shares may be reported to the IRS unless the U.S. Holder establishes a basis for exemption. Backup withholding may apply to amounts subject to reporting if (1) the U.S. Holder fails to provide an accurate taxpayer identification number or otherwise establish a basis for exemption, or (2) the U.S. Holder is notified by the IRS that backup withholding applies. Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules generally will be allowed as a refund or a credit against a U.S. Holder’s U.S. federal income tax liability if the required information is furnished by the U.S. Holder on a timely basis to the IRS.

For Non-U.S. Holders, information returns may be filed with the IRS in connection with, and Non-U.S. Holders may be subject to U.S. tax withholding on amounts received in respect of, a Non-U.S. Holder’s common shares, unless the Non-U.S. Holder furnishes to the applicable withholding agent the required certification as to its non-U.S. status, such as by providing a valid IRS Form W-8BEN, IRS Form W-8BEN-E or IRS Form W-8ECI, as applicable, or the Non-U.S. Holder otherwise establishes an exemption. Distributions paid with respect to common shares and proceeds from the sale of or other disposition of common shares received in the United States by a Non- U.S. Holder through certain U.S.-related financial intermediaries may be subject to information reporting and U.S. tax withholding unless such Non-U.S. Holder provides proof of an applicable exemption or complies with certain certification procedures described above. If a Non-U.S. Holder sells its common shares through a U.S. office of a broker, the payment of the proceeds is subject to both U.S. backup withholding and information reporting unless such Non-U.S. Holder certifies that it is a non-U.S. person, under penalties of perjury, or it otherwise establishes an exemption. If a Non-U.S. Holder sells common shares through a non-U.S. office of a non-U.S. broker and the sales proceeds are paid to such Non-U.S. Holder outside the United States, then information reporting and backup withholding generally will not apply to that payment. However, U.S. information reporting requirements, but not backup withholding, will apply to a payment of sales proceeds, even if that payment is made to a Non-U.S. Holder outside the United States, if such Non-U.S. Holder sells common shares through a non-U.S. office of a broker that is a U.S. person or has certain other contacts with the United States, unless such Non-U.S. Holder certifies that it is a non-U.S. person under penalty of perjury, or otherwise establishes an exemption.

The discussion of reporting requirements set forth above is not intended to constitute a complete description of all reporting requirements that may apply to a U.S. Holder or Non-U.S. Holder. A failure to satisfy certain reporting requirements may result in an extension of the time period during which the IRS can assess a tax and, under certain circumstances, such an extension may apply to assessments of amounts unrelated to any unsatisfied reporting requirement. U.S. Holders and Non-U.S. Holders should consult with their own tax advisors regarding their reporting obligations, if any, as a result of their acquisition, ownership, or disposition of our common shares.

THE DISCUSSION ABOVE IS A GENERAL SUMMARY. IT DOES NOT COVER ALL TAX MATTERS THAT MAY BE OF IMPORTANCE TO A U.S. HOLDER OR NON-U.S. HOLDER. EACH U.S. HOLDER AND NON-U.S. HOLDER IS URGED TO CONSULT ITS OWN TAX ADVISOR ABOUT THE TAX CONSEQUENCES TO IT OF AN INVESTMENT IN COMMON SHARES IN LIGHT OF THE INVESTOR’S OWN CIRCUMSTANCES.

MATERIAL CANADIAN FEDERAL INCOME TAX CONSIDERATIONS

The following is, as of August 7, 2025, a summary of the principal Canadian federal income tax considerations under the Income Tax Act (Canada) (Tax Act) generally applicable to a holder who acquires our common shares as a beneficial owner under this offering and who, for purposes of the Tax Act and at all relevant times, is neither resident in Canada nor deemed to be resident in Canada for purposes of the Tax Act and any applicable income tax treaty or convention, and who does not use or hold (and is not deemed to use or hold) common shares in the course of carrying on a business in Canada, deals at arm’s length with and is not affiliated with us and holds our common shares as capital property (Holder). Generally, common shares will be considered to be capital property to a Holder thereof provided that the Holder does not hold common shares in the course of carrying on a business and such Holder has not acquired them in one or more transactions considered to be an adventure or concern in the nature of trade.

This summary does not apply to a Holder, (i) that is a “financial institution” for purposes of the mark-to-market rules contained in the Tax Act; (ii) that is a “specified financial institution” as defined in the Tax Act; (iii) that holds an interest which is a “tax shelter investment” as defined in the Tax Act; or (iv) that has elected to report its tax results in a functional currency other than Canadian currency. Special rules, which are not discussed in this summary, may apply to a Holder that is an “authorized foreign bank” within the meaning of the Tax Act, a partnership or an insurer carrying on business in Canada and elsewhere. Such Holders should consult their own tax advisors.

This summary is based upon the provisions of the Tax Act (including the regulations (Regulations) thereunder) in force as of August 7, 2025, and our understanding of the current administrative policies and assessing practices of the Canada Revenue Agency (CRA) published in writing by the CRA prior to August 7, 2025. This summary takes into account all specific proposals to amend the Tax Act (and the Regulations) publicly announced by or on behalf of the Minister of Finance (Canada) prior to the date hereof (Tax Proposals) and assumes that the Tax Proposals will be enacted in the form proposed, although no assurance can be given that the Tax Proposals will be enacted in their current form or at all. This summary does not otherwise take into account any changes in law or in the administrative policies or assessing practices of the CRA, whether by legislative, governmental or judicial decision or action. This summary is not exhaustive of all possible Canadian federal income tax considerations and does not take into account other federal or any provincial, territorial or foreign income tax legislation or considerations, which may differ materially from those described in this summary.

This summary is of a general nature only and is not, and is not intended to be, and should not be construed to be, legal or tax advice to any particular Holder, and no representations concerning the tax consequences to any particular Holder are made. Holders should consult their own tax advisors regarding the income tax considerations applicable to them having regard to their particular circumstances.

Currency

Generally for purposes of the Tax Act, all amounts relating to the acquisition, holding or disposition of our common shares (including dividends, adjusted cost base and proceeds of disposition) must be determined in Canadian dollars based on the relevant exchange rate under the Tax Act.

Dividends

Dividends paid or credited (or deemed to be paid or credited) to a Holder by us are subject to Canadian withholding tax at the rate of 25% unless reduced by the terms of an applicable tax treaty or convention. For example, under the US Treaty, as amended, the dividend withholding tax rate is generally reduced to 15% in respect of a dividend paid or credited to a Holder beneficially entitled to the dividend who is resident in the United States for purposes of the US Treaty and whose entitlement to the benefits of the US Treaty is not limited by the limitation of benefits provisions of the US Treaty. Holders are urged to consult their own tax advisors to determine their entitlement to relief under the US Treaty or any other applicable tax treaty as well as their ability to claim foreign tax credits with respect to any Canadian withholding tax, based on their particular circumstances.

Disposition of Common Shares

A Holder generally will not be subject to tax under the Tax Act in respect of a capital gain realized on the disposition or deemed disposition of a common share, unless the common share constitutes or is deemed to constitute “taxable Canadian property” to the Holder thereof for purposes of the Tax Act, and the gain is not exempt from tax pursuant to the terms of an applicable tax treaty or convention.

In general, provided the common shares are listed on a “designated stock exchange” (which currently includes The Nasdaq Capital Market) at the date of the disposition, the common shares will only constitute “taxable Canadian property” of a Holder if, at any time within the 60-month period preceding the disposition: (i) such Holder, persons with whom the Holder did not deal at arm’s length, partnerships in which the Holder or a person with whom the Holder did not deal at arm’s length holds a membership interest directly or indirectly through one or more partnerships, or any combination thereof, owned 25% or more of the issued shares of any class or series of the Company’s share capital; and (ii) more than 50% of the fair market value of the common shares was derived directly or indirectly from one or any combination of (A) real or immovable property situated in Canada, (B) Canadian resource properties, (C) timber resource properties, and (D) options in respect of, or interests in, or for civil law rights in, property described in any of subparagraphs (ii)(A) to (C), whether or not the property exists. However, and despite the foregoing, in certain circumstances the common shares may be deemed to be “taxable Canadian property” under the Tax Act.

Holders whose common shares may be “taxable Canadian property” should consult their own tax advisers.

LEGAL MATTERS

The validity of the common shares being offered by this prospectus supplement has been passed upon for us by Pushor Mitchell LLP, Kelowna, British Columbia, Canada. Certain legal matters will be passed upon for us by Alston & Bird LLP, New York, New York. TD Cowen is being represented in connection with this offering by Wilmer Cutler Pickering Hale and Dorr LLP, New York, New York.

EXPERTS

The consolidated financial statements incorporated into this prospectus supplement by reference to the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 have been audited by Baker Tilly US, LLP, an independent registered public accounting firm. Their report, which is incorporated herein by reference, expresses an unqualified opinion on the consolidated financial statements. Such consolidated financial statements have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with the SEC. Our SEC filings are available to the public through the Internet at the SEC’s website at www.sec.gov, which contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

We also file annual audited and interim unaudited financial statements, proxy statements and other information with the Ontario, Manitoba, Québec, Alberta and British Columbia Securities Commissions. Copies of these documents that are filed through the System for Electronic Document Analysis and Retrieval (SEDAR+) of the Canadian Securities Administrators are available at its website www.sedarplus.ca.

In addition, we maintain a website that contains information regarding our Company, including copies of reports, proxy statements and other information we file with the SEC. The address of our website is www.diamedica.com. Except for the documents specifically incorporated by reference into this prospectus supplement, information contained on our website or that can be accessed through our website does not constitute a part of this prospectus supplement. We have included our website address only as an inactive textual reference and do not intend it to be an active link to our website.

We have filed with the SEC a registration statement on Form S-3 under the Securities Act with respect to the securities offered by this prospectus supplement and the accompanying prospectus. When used in this prospectus supplement, the term “registration statement” includes amendments to the registration statement as well as the exhibits, schedules, financial statements and notes filed as part of the registration statement. This prospectus supplement, which constitutes a part of the registration statement, does not contain all of the information in the registration statement. This prospectus supplement omits information contained in the registration statement as permitted by the rules and regulations of the SEC. For further information with respect to us and the common shares that may be offered by this prospectus supplement, reference is made to the registration statement. Statements herein concerning the contents of any contract or other document are not necessarily complete and in each instance reference is made to the copy of such contract or other document filed with the SEC as an exhibit to the registration statement, each such statement being qualified by and subject to such reference in all respects.

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to incorporate by reference the information we file with them. This allows us to disclose important information to you by referencing those filed documents. We have previously filed the documents set forth below with the SEC and are incorporating them by reference into this prospectus supplement and the registration statement. Our SEC file no. is 001‑36291.

We also are incorporating by reference any future information filed (rather than furnished) by us with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this prospectus supplement and until the termination or completion of this offering. The most recent information that we file with the SEC automatically updates and supersedes more dated information.

You may access our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, proxy statement, and amendments, if any, to those documents filed or furnished pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act with the SEC free of charge at the SEC’s website at www.sec.gov or our website as soon as reasonably practicable after such material is electronically filed with, or furnished to, the SEC. Except for the documents specifically incorporated by reference into this prospectus supplement, information contained on our website or that can be accessed through our website does not constitute a part of this prospectus supplement or the accompanying prospectus. We have included our website address only as an inactive textual reference and do not intend it to be an active link to our website.

You can obtain a copy of any documents which are incorporated by reference in this prospectus supplement, except for exhibits which are not specifically incorporated by reference into those documents, at no cost, by writing or telephoning us at:

DiaMedica Therapeutics Inc.

301 Carlson Parkway, Suite 210

Minneapolis, Minnesota 55305

Attention: Secretary

(763) 496-5454

$100,000,000

Common Shares

PROSPECTUS SUPPLEMENT

TD Cowen

August 22, 2025