Climb Bio, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

For the quarterly period ended September 30,2026

OR

For the transition period from to

Commission File Number:001-40708

CLIMB BIO, INC.

(Exact Name of Registrant as Specified in its Charter)

Registrant’s telephone number, including area code: (866)-857-2596

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No☒

As of October 30, 2026, the registrant had 58,738,178 shares of common stock, $0.0001 par value per share, outstanding.

Table of Contents

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q (Quarterly Report) contains forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended (Securities Act), and Section 21E of the Securities Exchange Act of 1934, as amended (Exchange Act), that involve substantial risks and uncertainties. All statements, other than statements of historical fact, contained in this Quarterly Report, including statements regarding our strategy, future operations, future financial position, future revenue, projected costs, prospects, plans, objectives of management and expected market growth, are forward-looking statements. The words “anticipate,” “believe,” “contemplate,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “will,” “would,” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words.

The forward-looking statements in this Quarterly Report include, among other things, statements about:

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the initiation, timing, progress and results of our and our partners’ research and development programs, nonclinical studies and clinical trials;

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the anticipated timing of the submission and clearance of investigational new drug applications (IND) and comparable foreign applications for budoprutug and CLYM116;

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our estimates regarding the potential patient populations for our product candidates;

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our estimates regarding expenses, future revenue, capital requirements, need for additional financing and the period over which we believe our cash, cash equivalents and marketable securities will be sufficient to fund our operating expenses and capital expenditure requirements;

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our plans to develop and, if approved, subsequently commercialize our product candidates;

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the timing of and our ability to submit applications for, and obtain and maintain regulatory approvals for our product candidates;

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our intellectual property position and our expectations regarding our ability to obtain, maintain and enforce intellectual property protection for our product candidates;

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our estimates regarding the size of the potential markets for our product candidates and our ability to serve those markets;

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our commercialization, marketing and manufacturing capabilities and strategy;

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our competitive position and expectations regarding developments and projections relating to our competitors and any competing products that are or might become available;

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the impact of government laws and regulations;

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the benefits of, and our ability to satisfy our obligations under, our license agreements;

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our ability to enter into future collaborations, strategic alliances, or option and license arrangements; and

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our expectations regarding the time during which we will be an emerging growth company under the Jumpstart Our Business Startups Act of 2012 (JOBS Act).

We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. We have included important factors in this Quarterly Report particularly in the “Risk Factor Summary” below and in Part II, Item 1A, “Risk Factors,” that we believe could cause actual results or events to differ materially from the forward-looking statements that we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make.

You should read this Quarterly Report and the documents that we reference herein and have filed as exhibits or incorporated by reference hereto completely and with the understanding that our actual future results may be materially different from what we expect. The forward-looking statements contained in this Quarterly Report are made as of the date of this Quarterly Report, and we do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law.

Risk Factor Summary

Our business is subject to numerous risks and uncertainties, including those risks discussed in further detail below. These risks include, among others, the following:

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We have incurred significant losses since our inception and expect to continue incurring substantial losses for the foreseeable future.

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If we are unable to access capital when needed and on acceptable terms, we may be forced to delay, reduce, or discontinue our product candidate development programs, commercialization efforts, or other operations.

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We currently have no source of product revenue and may never become profitable.

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Our future success is dependent on the regulatory approval and commercialization of our product candidates, and if we are unable to successfully develop and commercialize our product candidates, or experience any delay in doing so, our business could be materially harmed.

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Preliminary, initial, or interim results from clinical trials that we announce, present, or publish from time to time may change as more data and information become available (or are updated based upon audit, validation and verification procedures of the data/information commonly performed for clinical trials) that could result in material changes in the final trial results.

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Nonclinical and clinical development involves a lengthy, complex, and expensive process, which is uncertain and may not predict final outcomes, and our product candidates may not demonstrate safety or efficacy in later-stage trials or satisfy regulatory requirements. Further, clinical development in immunology and autoimmune diseases presents inherent challenges, such as disease heterogeneity, variable clinical course, and evolving regulatory expectations for clinically meaningful endpoints, any of which may delay or impair our ability to obtain regulatory approval.

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If we encounter difficulties enrolling or retaining patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

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We face significant competition in an environment of rapid technological change, and our competitors may develop or obtain regulatory approval for products before us or develop products that are safer, less expensive, or more effective than our product candidates, which could impair our commercial prospects.

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Our estimates of market opportunity and forecasts of market growth for our product candidates may prove to be inaccurate, and even if the markets in which we compete achieve the forecasted growth, our business may not grow at similar rates, or at all.

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We are, have been, and may in the future become, involved in litigation that could result in significant costs, divert the attention of management and harm our business.

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Enacted and future legislation may increase the difficulty and cost for us to obtain marketing approval and commercialize our product candidates, if and when approved, and may affect the prices we may charge for such product candidates, if and when approved.

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Disruptions in our supply chain or manufacturing, including reliance on single-source suppliers and the complexities of biologics manufacturing, could delay, prevent, or impair our development or commercialization efforts.

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If we are unable to obtain, maintain, or enforce adequate intellectual property protection, our competitive position could be harmed, and we rely heavily on certain in-licensed patents and other intellectual property rights in connection with our development of our product candidates and may be required to acquire or license additional patents or other intellectual property rights to continue to develop and commercialize our product candidates.

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With respect to budoprutug, we own two pending U.S. provisional patent applications, nine pending U.S. nonprovisional patent applications, three pending Patent Cooperation Treaty international patent applications (each, a PCT application), and eight pending ex-U.S. patent applications, and we have also exclusively licensed four issued U.S. patents and at least 45 ex-U.S. patents or patent applications under our license agreement (the CRH Agreement) with Cancer Research Technology Limited (CRH). With respect to CLYM116, we have one exclusively in-licensed PCT application under the Mabworks Agreement and co-own six pending U.S. provisional patent applications, one pending U.S. nonprovisional patent application, and one pending PCT application with Beijing Mabworks Biotech Co., Ltd. (Mabworks). We can provide no assurance that any of our current or future patent applications will result in issued patents. If we are unable to obtain, maintain and protect sufficient patent and other intellectual property rights for our product candidates and technology, or if the scope of patent and other intellectual property rights obtained is not sufficiently broad, we may not be able to compete effectively in our market.

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If our information technology systems or data, or those of third parties upon which we rely, such as contract research organizations (CROs), are or were compromised or interrupted, we could experience adverse consequences resulting from such compromise or interruption, including but not limited to regulatory investigations or actions; litigation; fines and penalties; disruptions of our business operations; reputational harm; loss of revenue or profits; loss of customers or sales; and other adverse consequences.

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We may not be able to attract or retain key personnel necessary to execute our business strategy.

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The trading price of our common stock has been and may continue to be volatile, and purchasers of our common stock could incur substantial losses.

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We have identified material weaknesses in our internal control over financial reporting; if we are unable to remediate these material weaknesses, or if we identify additional material weaknesses in the future, or otherwise fail to maintain effective internal control over financial reporting, we may not be able to accurately or timely report our financial condition or results of operations, which may adversely affect our business.