Septerna, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

For the quarterly period ended March 31,2026

OR

For the transition period from _______________ to _______________

Commission File Number:001-42382

Septerna, Inc.

(Exact name of registrant as specified in its charter)

(650)338-3533

(Registrant’s telephone number, including area code)

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 May 7, 2026, the registranthad 45,075,533 shares of common stock, $0.001 par value per share, outstanding.

TABLE OF CONTENTS

We own various U.S. federal trademark applications and unregistered trademarks, including our company name and logo, that we use in connection with the operation of our business. This Quarterly Report on Form 10-Q (this “Quarterly Report”) includes our trademarks and trade names which are protected under applicable intellectual property laws and are our property. This Quarterly Report also contains trademarks, trade names and service marks of other companies, which are the property of their respective owners. Solely for convenience, trademarks, trade names and service marks referred to in this Quarterly Report may appear without the ®, ™ or SM symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent permitted under applicable law, our rights or the right of the applicable licensor to these trademarks, trade names and service marks. We do not intend our use or display of other parties’ trademarks, trade names or service marks to imply, and such use or display should not be construed to imply, a relationship with, or endorsement or sponsorship of us by, these other parties.

From time to time, we may use our website as well as social media, including our X (formerly known as Twitter) account at Septerna_Inc and our LinkedIn account at https://www.linkedin.com/company/septernainc/ to distribute material information about us and for complying with our disclosure obligations under Regulation FD. Our financial and other material information is routinely posted to and accessible on the Investors section of our website, available at www.Septerna.com. Investors are encouraged to review the Investors section of our website because we may post material information on that site that is not otherwise disseminated by us. Information that is contained in and can be accessed through our website or our social media are not incorporated into, and does not form a part of, this Quarterly Report.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report contains express or implied forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). These statements are based on our management’s belief and assumptions and on information currently available to our management. Although we believe that the expectations reflected in these forward-looking statements are reasonable, these statements relate to future events or our future operational or financial performance, and involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by these forward-looking statements. Forward-looking statements in this Quarterly Report include, but are not limited to, statements about:

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the initiation, timing, progress, results and costs of conducting our research and development programs and our current and future preclinical studies and clinical trials, including statements regarding the timing of initiation and completion of studies or trials and related preparatory work, the period during which the results of the trials will become available, and our current and future programs;

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the potential therapeutic benefits of our product candidates, including our SEP-479 and SEP-631 programs;

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our ability to demonstrate, and the timing of, preclinical proof-of-conceptin vivo andex vivo for multiple programs;

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our ability to replicate positive results achieved in our preclinical studies or clinical trials in current or future clinical trials;

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our ability to obtain and maintain regulatory approval for our current and future product candidates and research and development programs, including our SEP-479 and SEP-631 programs, and to advance any product candidates that we may identify and successfully complete any clinical studies, including the manufacture of any such product candidates;

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the timing, scope and likelihood of regulatory filings and approvals, including timing of Investigational New Drug (“IND”) applications or comparable foreign applications, and final U.S. Food and Drug Administration (the “FDA”) approval of our product candidates;

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the timing, scope or likelihood of foreign regulatory filings and approvals;

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the implementation of our business model, and strategic plans for our business, product candidates, and technology;

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the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates and other product candidates we may develop, including the extensions of existing patent terms where available, the validity of intellectual property rights held by third parties, and our ability not to infringe, misappropriate or otherwise violate any third-party intellectual property rights;

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developments relating to our competitors and our industry;

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our ability to leverage programs within our initial target indications and to progress additional programs to further develop our pipeline;

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the ability of our preclinical studies and clinical trials to demonstrate safety and efficacy of our product candidates, and other positive results;

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the partnership with Novo Nordisk A/S (“Novo”) and the intended and potential benefits thereof, including the receipt of potential milestone and royalty payments from commercial product sales, along with tiered royalties based on global net sales, if any;

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Novo's ability to develop and commercialize potential oral small molecule therapies for metabolic-related diseases and the potential of G protein-coupled receptors, including the GLP-1, GIP, and glucagon receptors, to address the unmet medical need for treating obesity, type 2 diabetes and other related conditions;

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our ability to maintain existing collaborations and strategic partnerships, to identify and enter into future license agreements and collaborations, and to realize the intended and potential benefits of such agreements and collaborations;

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our ability to rely on third-party manufacturers and successfully manufacture product candidates for preclinical use, clinical trials and on a larger scale for commercial use, if approved;

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our ability to realize the benefits of collaborations for the development and commercialization of our product candidates;

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our ability to commercialize any of our product candidates;

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developments related to our proprietary Native Complex Platform®;

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regulatory developments in the United States and foreign countries;

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our ability to obtain funding for our operations necessary to complete further development and commercialization of our product candidates;

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

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our need for and ability to attract and retain key scientific, management and other personnel and to identify, hire, and retain additional qualified professionals;

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our expectations regarding the period during which we will remain an emerging growth company under the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”);

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the period over which we expect our existing cash, cash equivalents and investments will be sufficient to fund our operating expenses and capital expenditure requirements;

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our anticipated use of our existing resources;

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our financial performance and estimates of our future expenses, capital requirements, and our needs for additional financing;

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the impact of macroeconomic and geopolitical developments (such as the recent conflict in Iran, as well as ongoing conflicts in Ukraine, and in the Middle East) on our business, including inflationary pressures and capital market disruptions, changes in or disruptions of U.S. governmental agencies, whether from a future U.S. federal government shutdown or reduced resources, new or increased international tariffs and retaliatory tariffs, trade protection measures, economic sanctions and economic slowdowns or recessions that may result from such developments which could harm our research and development efforts as well as the value of our common stock and our ability to access capital markets; and

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other risks and uncertainties, including those listed under the section titled “Risk Factors” in Part II, Item 1A in this Quarterly Report.

In some cases, you can identify forward-looking statements by terminology such as “may,” “might,” “will,” “could,” “would,” “should,” “expect,” “plan,” “anticipate,” “intend,” “believe,” “estimate,” “seek,” “predict,” “future,” “project,” “potential,” “continue,” “target,” “contemplate,” “possible,” “can,” or the negative of these terms or other comparable terminology, and similar expressions, although not all forward-looking statements contain these identifying words. These statements are only predictions. You should not place undue reliance on forward-looking statements because they involve known and unknown risks, uncertainties, and other factors, which are, in some cases, beyond our control and which could materially affect results. Factors that may cause actual results to differ materially from current expectations include, among other things, those listed under the section titled “Summary of Material and Other Risks Associated With our Business” below and under the caption “Risk Factors” in our filings with the Securities and Exchange Commission (the “SEC”) and elsewhere in this Quarterly Report. If one or more of these risks or uncertainties occur, or if our underlying assumptions prove to be incorrect, actual events or results may vary significantly from those implied or projected by the forward-looking statements. No forward-looking statement is a guarantee of future performance. You should read this Quarterly Report and the documents that we reference in this Quarterly Report and have filed with the SEC thereto completely and with the understanding that our actual future results may be materially different from any future results expressed or implied by these forward-looking statements.

The forward-looking statements in this Quarterly Report represent our views as of the date of this Quarterly Report. We do not undertake any obligation to publicly update any forward-looking statement except to the extent required by applicable law. You should therefore not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this Quarterly Report.

This Quarterly Report also contains estimates, projections and other information concerning our industry, our business and the markets for our product candidates. Information that is based on estimates, forecasts, projections, market research or similar methodologies is inherently subject to uncertainties and actual events or circumstances may differ materially from events and circumstances that are assumed in this information. Unless otherwise expressly stated, we obtained this industry, business, market, and other data from our own internal estimates and research as well as from reports, research surveys, studies, and similar data prepared by market research firms and other third parties, industry, medical and general publications, government data and similar sources. All of the market data used in this Quarterly Report involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such data. Industry publications and third-party 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. Our estimates of the potential market opportunities for our product candidates include several key assumptions based on our industry knowledge, industry publications, third-party research, and other surveys, which may be based on a small sample size and may fail to accurately reflect market opportunities. While we believe that our internal assumptions are reasonable, no independent source has verified such assumptions.

This Quarterly Report contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual

iii documents. Copies of some of the documents referred to herein have been filed as exhibits to this Quarterly Report. Unless the context otherwise requires, reference in this Quarterly Report to the terms “Septerna,” “the Company,” “we,” “us,” “our,” and similar designations refer to Septerna, Inc.

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SUMMARY OF MATERIAL AND OTHER RISKS ASSOCIATED WITH OUR BUSINESS

Our business is subject to numerous risks and uncertainties and are subject to change based on various factors, including those highlighted in this section, and in the section entitled “Risk Factors” in our filings with the SEC and elsewhere in this Quarterly Report. These risks include, but are not limited to, the following:

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We have a limited operating history and have incurred significant operating losses since our inception and expect to incur significant losses for the foreseeable future.

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We will require substantial additional funding in order to finance our operations. If we are unable to raise additional capital when needed on acceptable terms, or at all, we may be forced to delay, reduce, or terminate certain of our research and product development programs, future commercialization efforts or other operations.

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We are early in our development efforts. We have not successfully completed any advanced clinical trials, and as a result it will be years before we commercialize a product candidate, if ever. If we are unable to identify and advance product candidates through preclinical studies and clinical trials, obtain marketing approval and ultimately commercialize them, or experience significant delays in doing so, our business will be materially harmed.

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Preclinical and clinical drug development is a lengthy and expensive process, with uncertain timelines and outcomes. If preclinical studies or clinical trials of our product candidates are prolonged or delayed, we may be unable to obtain required regulatory approvals, and therefore be unable to commercialize our therapeutic candidates or any of our future therapeutic candidates on a timely basis or at all.

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We may encounter substantial delays in the commencement, enrollment or completion of our planned clinical trials or we may fail to demonstrate safety and efficacy to the satisfaction of applicable regulatory authorities, which could prevent us from commercializing any product candidates we determine to develop on a timely basis, if at all.

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Serious adverse events, undesirable side effects or other unexpected properties of our product candidates may be identified during development or after approval, which could lead to the discontinuation of our clinical development programs, refusal by regulatory authorities to approve our product candidates or, if discovered following marketing approval, revocation of marketing authorizations or limitations on the use of our product candidates, any of which would limit the commercial potential of such product candidate.

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Our product candidates are subject to extensive regulation and compliance obligations, which is costly and time-consuming and which may cause unanticipated delays or prevent the receipt of the required approvals to commercialize our product candidates.

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Enrollment and retention of patients in clinical trials is an expensive and time-consuming process and could be made more difficult or rendered impossible by multiple factors outside our control, which could adversely affect our business, operating results and prospects.

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Our proprietary Native Complex Platform® is based on novel technologies that are unproven and may not result in approvable or marketable products, which exposes us to unforeseen risks and makes it difficult for us to predict the time and cost of product development and potential for regulatory approval, and we may not be successful in our efforts to expand our development portfolio of product candidates.

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We currently have no marketing and sales organization and have no experience as a company in commercializing products, and we may invest significant resources to develop these capabilities. If we are unable to establish marketing, sales or distribution capabilities or enter into agreements with third parties to market and sell our products, we may not be able to generate product revenue.

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Even if any of our product candidates receive marketing approval, such product candidate may fail to achieve market acceptance by physicians, patients, third-party payors or others in the medical community necessary for commercial success, in which case we may not generate significant revenues or become profitable.

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We face substantial competition, which may result in others discovering, developing or commercializing products before or more successfully than us.

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We rely on third-party manufacturers, clinical research organizations (“CROs”), contract manufacturing organizations (“CMOs”), and suppliers to supply, develop and test components of our product candidates. The loss of our third-party manufacturers, CROs, CMOs, or suppliers, their failure to comply with applicable regulatory requirements or to supply sufficient quantities at acceptable quality levels or prices, or at all, or changes in methods of product candidate manufacturing, development or formulation would materially and adversely affect our business.

The material and other risks summarized above should be read together with the text of the full risk factors and in the other information set forth in our filings with the SEC and in this Quarterly Report, including our financial statements and the related notes,

v as well as in other documents that we file with the SEC. If any such material and other risks and uncertainties actually occur, our business, prospects, financial condition and results of operations could be materially and adversely affected. The risks summarized above or described in full are not the only risks that we face. Additional risks and uncertainties not currently known to us, or that we currently deem to be immaterial may also materially adversely affect our business, prospects, financial condition and results of operations

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