Mereo BioPharma signs alvelestat deal with Sentynl

Mereo BioPharma Group plc entered into an Option and License Agreement with Sentynl Therapeutics for the U.S. commercial and global manufacturing rights to alvelestat for alpha-1 antitrypsin deficiency-associated lung disease (AATD-LD).

Rhea-AI Filing Summary

Mereo BioPharma Group plc entered into an Option and License Agreement with Sentynl Therapeutics for the U.S. commercial and global manufacturing rights to alvelestat for alpha-1 antitrypsin deficiency-associated lung disease (AATD-LD). The agreement grants Sentynl an exclusive option to license U.S. commercialization rights while Mereo retains commercial rights for the rest of the world.

Under the terms, Mereo will receive a non-refundable option fee and, upon option exercise, would be eligible for $40 million in upfront and R&D payments, up to $435 million in potential regulatory and commercial milestones, and double-digit tiered royalties on U.S. net sales. Sentynl would also fund the alvelestat Phase 3 development program on option exercise. Mereo will lead the global Phase 3 study and regulatory interactions until completion, while the companies collaborate during a short option period to refine the Phase 3 design and advance manufacturing.

Positive

• Option and license deal adds potential $40 million in upfront and R&D payments plus up to $435 million in milestones and royalties-based revenue.
• Sentynl funding the alvelestat Phase 3 program on option exercise reduces Mereo’s future development funding burden.
• Mereo retains rest-of-world commercial rights to alvelestat while partnering for U.S. commercialization and global manufacturing.

Negative

• None.

Filing Explained

The August 11 agreement starts an option period; the fee is unquantified, and the license and larger payments depend on exercise.

As a Form 8-K, this filing reports Mereo’s August 11 entry into an Option and License Agreement with Sentynl for alvelestat. The immediate structural change is an option framework—not a completed U.S. license: Sentynl holds the option, while the larger license-related payments and U.S. commercialization rights depend on exercise.

Mereo will receive a non-refundable option fee, but the filing does not state its amount. The filing also identifies global manufacturing rights for Sentynl and says Mereo retains commercial rights outside the United States; the larger payments remain described as potential or conditional rather than received.

The filing does not report option exercise or commencement of Phase 3; it says the program could begin in early 2027 if the option is exercised. At March 31, 2026, Mereo had $36,223,000 of cash and equivalents and reported operating cash flow of -$4,312,000.

The agreement itself is expected to be filed as an exhibit to Mereo’s Form 10-Q for the quarter ending September 30, 2026; that filing should provide the detailed option and payment mechanics.

8-K Event Classification

3 items: 1.01, 7.01, 9.01

3 items

Item 1.01 Entry into a Material Definitive Agreement Business

The company signed a significant contract such as a merger agreement, credit facility, or major partnership.

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, or exhibit attachments filed with this report.

Key Figures

Upfront and R&D payments: $40 million Potential milestone payments: $435 million AATD-LD U.S. prevalence: 50,000–80,000 people +2 more

5 metrics

Upfront and R&D payments $40 million Eligible on exercise of Sentynl’s option under the alvelestat agreement

Potential milestone payments $435 million Regulatory and commercial milestones tied to alvelestat for AATD-LD

AATD-LD U.S. prevalence 50,000–80,000 people Estimated prevalence of the Pi*ZZ variant in the United States

Alvelestat clinical exposure over 1,000 patients Number of patients exposed to alvelestat in respiratory disease trials

Rare disease product candidates 3 Setrusumab, alvelestat and vantictumab in Mereo’s rare disease portfolio

Key Terms

Option and License Agreement, alpha-1 antitrypsin deficiency-associated lung disease, Orphan Drug Designation, Fast Track designation, +1 more

5 terms

Option and License Agreement regulatory

"entered into an Option and License Agreement (the “Agreement”) with Sentynl"

alpha-1 antitrypsin deficiency-associated lung disease medical

"rights to alvelestat for alpha-1 antitrypsin deficiency-associated lung disease"

A genetic condition in which the body lacks enough of a protein that protects the lungs, causing progressive lung damage and breathing problems similar to how a missing air filter lets dust gum up an engine. It matters to investors because it creates a defined group of patients and ongoing medical need, which shapes demand for treatments, the size of potential markets, clinical trial designs, regulatory decisions, and reimbursement dynamics.

Orphan Drug Designation regulatory

"Alvelestat has received Orphan Drug Designation for AATD-LD"

Orphan drug designation is a special status given to medicines developed to treat rare diseases affecting only a small number of people. This status often provides benefits like faster approval processes and financial incentives, making it more attractive for companies to develop these drugs. For investors, it signals potential for exclusive market rights and reduced competition, which can impact the drug’s profitability.

Fast Track designation regulatory

"It has also received Fast Track designation from the FDA"

Fast track designation is a status the U.S. Food and Drug Administration grants to drugs intended to treat serious conditions and address an unmet medical need. It gives the developer more frequent communication with the FDA and can allow parts of the application to be reviewed on a rolling basis, and it may pave the way to priority review or accelerated approval. It can shorten development timelines, though it does not guarantee approval.

neutrophil elastase inhibitor medical

"Alvelestat is a novel, oral small molecule designed to specifically inhibit neutrophil elastase"

A neutrophil elastase inhibitor is a drug or compound that blocks neutrophil elastase, an enzyme released by white blood cells during inflammation that can break down healthy tissue. Think of it as putting a guardrail around an overactive clean-up crew to prevent collateral damage in organs like the lungs. It matters to investors because these inhibitors are a therapeutic class targeted in clinical trials and regulatory reviews for inflammatory and respiratory diseases, influencing development timelines, market opportunity, and licensing or acquisition value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What agreement did Mereo BioPharma (MREO) sign with Sentynl Therapeutics?

Mereo BioPharma signed an Option and License Agreement with Sentynl for U.S. commercial and global manufacturing rights to alvelestat for AATD-LD. Sentynl gains an exclusive U.S. commercialization option, while Mereo keeps rest-of-world rights and leads global Phase 3 development.

How much could Mereo BioPharma (MREO) receive financially from the Sentynl deal?

Mereo could receive a non-refundable option fee, $40 million in upfront and R&D payments upon option exercise, and up to $435 million in potential regulatory and commercial milestones. It is also entitled to double-digit tiered royalties on U.S. net sales of alvelestat.

Who will lead Phase 3 development of alvelestat under the MREO–Sentynl agreement?

Mereo BioPharma will lead the global Phase 3 study and regulatory interactions for alvelestat until completion. During the option period, Mereo and Sentynl will collaborate to refine the Phase 3 design and advance manufacturing before potential Phase 3 initiation, which could occur in early 2027.

What commercialization rights does Sentynl gain in the MREO alvelestat deal?

Upon option exercise, Sentynl gains exclusive rights to commercialize alvelestat in the United States and global manufacturing rights for AATD-LD. Mereo retains commercial rights for the rest of the world while benefiting from U.S. royalties, milestones, and development funding support.

How large is the target patient population for alvelestat mentioned by Mereo BioPharma (MREO)?

The materials state that AATD-LD affects an estimated 50,000–80,000 individuals in the United States. Alvelestat, a neutrophil elastase inhibitor being readied for Phase 3, could become the first oral treatment for this rare, progressive genetic lung disease if approved.

What regulatory designations has alvelestat received according to Mereo BioPharma (MREO)?

Alvelestat has received Orphan Drug Designation for AATD-LD from both the European Commission and the FDA, and Fast Track designation from the FDA. These designations are intended to facilitate development and review for treatments targeting serious rare diseases.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

Current Report

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 11, 2026

MEREO BIOPHARMA GROUP PLC

(Exact name of registrant as specified in its charter)

England and Wales		001-38452		Not Applicable
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

4th Floor, One Cavendish Place,

London, W1G 0QF

United Kingdom

(Address of principal executive offices, including zip code)

+44-333-023-7300

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

Title of each class		Trading Symbol		Name of each exchange on which registered
American Depositary Shares, each representing five Ordinary Shares, par value £0.003 per share		MREO		The Nasdaq Stock Market LLC
Ordinary Shares, nominal value £0.003 per share*		*		The Nasdaq Stock Market LLC

*Not for trading, but only in connection with the listing of the American Depositary Shares on The Nasdaq Stock Market LLC.

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

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. ☐

Item 1.01 Entry into a Material Definitive Agreement

On August 11, 2026, Mereo BioPharma Group plc (the “Company” or "Mereo") entered into an Option and License Agreement (the “Agreement”) with Sentynl Therapeutics, Inc. (“Sentynl”), a U.S.-based biopharmaceutical company, for the U.S. commercial and global manufacturing rights to alvelestat for alpha-1 antitrypsin deficiency-associated lung disease (“AATD-LD”). Under the Agreement, Mereo will receive a non-refundable option fee and, on option exercise, is eligible to receive $40 million in upfront and R&D payments, up to $435 million in potential milestones, and double-digit tiered royalties on U.S. sales of alvelestat. Mereo will lead the global Phase 3 study and regulatory interactions until the study is completed. During the option period, the Company and Sentynl will collaborate to advance manufacturing and refine the Phase 3 study design.

The Agreement contains various representations, warranties, covenants, dispute resolution mechanisms, indemnities and other provisions customary for transactions of this nature.

The foregoing description of the Agreement does not purport to be complete and is qualified in its entirety by the terms of the Agreement. A copy of the Agreement is expected to be filed as an exhibit to the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ending September 30, 2026.

Item 7.01 Regulation FD Disclosure.

On August 11, 2026, the Company issued a press release relating to the Agreement discussed in Item 1.01. The full text of the press release issued in connection with the announcement is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information contained in this Item 7.01, including Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, except as shall be expressly set forth by reference in such a filing.

Forward Looking Statements

This Current Report on Form 8-K contains “forward-looking statements.” All statements other than statements of historical fact contained herein are forward-looking statements within the meaning of Section 27A of the Securities Act, and Section 21E of the Exchange Act. Forward-looking statements usually relate to future events and anticipated revenues, earnings, cash flows or other aspects of the Company’s operations or operating results. Forward-looking statements are often identified by the words “believe,” “expect,” “anticipate,” “plan,” “intend,” “foresee,” “should,” “would,” “could,” “may,” “estimate,” “outlook,” “will,” “continue” and similar expressions, including the negative thereof. The absence of these words, however, does not mean that the statements are not forward-looking. These forward-looking statements are based on Mereo’s current expectations, beliefs and assumptions concerning future developments and business conditions and their potential effect on Mereo. While management believes that these forward-looking statements are reasonable as and when made, there can be no assurance that future developments affecting Mereo will be those that it anticipates. All of Mereo’s forward-looking statements involve known and unknown risks and uncertainties some of which are significant or beyond its control and assumptions that could cause actual results to differ materially from Mereo’s historical experience and its present expectations or projections. Such risks and uncertainties include, among others, the uncertainties inherent in the clinical development process; Mereo’s reliance on third parties to conduct and provide funding for its clinical trials; the sufficiency of existing cash to fund operations and/or the inability to raise additional funding on favorable terms or at all; the uncertainty inherent in regulatory review processes, including varying interpretations and analyses of data from clinical trials; Mereo’s dependence on enrollment of patients in its clinical trials; potentially smaller than anticipated market opportunities for Mereo’s product candidates; Mereo’s dependence on its key executives; the Company’s dependence on its strategic partners; and the Company’s ability to maintain compliance with Nasdaq continued listing requirements. You should carefully consider the foregoing factors and the other risks and uncertainties that affect Mereo’s business, including those described in the “Risk Factors” section of its latest Annual Report on Form 10-K, as well as discussions of potential risks, uncertainties, and other important factors in Mereo’s subsequent filings with the Securities and Exchange Commission. Mereo wishes to caution you not to place undue reliance on any forward-looking statements, which speak only as of the date hereof. Mereo undertakes no obligation to publicly update or revise any of our forward-looking statements after the date they are made, whether as a result of new information, future events or otherwise, except to the extent required by law.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.	Description of Exhibit
99.1	Press Release, dated August 11, 2026.
104	Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

	MEREO BIOPHARMA GROUP PLC
Date: August 11, 2026	By:	/s/ Christine Fox
		Name:	Christine Fox
		Title:	Chief Financial Officer

Exhibit 99.1

Mereo BioPharma and Sentynl Therapeutics Announce Option and License Agreement for alvelestat in Alpha-1 Antitrypsin Deficiency-Associated Lung Disease (AATD-LD)

•Sentynl expands its rare disease portfolio with potential first-in-class oral treatment for AATD-LD, a rare genetic respiratory disease

•On option exercise, Sentynl will have the right to commercialize the product in the United States; Mereo to lead global development and retains rest of the world rights

•Mereo will receive an upfront option fee and, on option exercise, is eligible to receive $40 million in upfront and R&D payments, up to $435 million in potential milestones, and double-digit tiered royalties on U.S. sales

•Companies will collaborate to refine the Phase 3 design during short option period

London, UK, Solana Beach, California, and Ahmedabad, India – August 11, 2026 – Mereo BioPharma Group plc (Nasdaq: MREO) (“Mereo” or the “Company”), a clinical-stage biopharmaceutical company focused on rare diseases and Sentynl Therapeutics, Inc. (“Sentynl”), a U.S.-based biopharmaceutical company and wholly-owned subsidiary of Zydus Lifesciences Limited (“Zydus”), today announced that they have entered into an option and license agreement for the U.S. commercial and global manufacturing rights to alvelestat for AATD-LD. Alvelestat is a neutrophil elastase inhibitor being readied for Phase 3 and, if approved, would be the first oral treatment for this rare, progressive genetic lung disease affecting an estimated 50,000-80,000 individuals in the United States.1,2,3,4,5,6

The option and license agreement grants Sentynl the exclusive right to acquire a license to commercialize alvelestat for AATD-LD in the United States, with Mereo retaining commercial rights in the rest of the world. The agreement also grants Sentynl global rights to manufacture alvelestat for AATD-LD and on option exercise, it provides funding for the alvelestat Phase 3 development program, which could be initiated in early 2027.

“We are very pleased to have the opportunity to partner with Sentynl to advance alvelestat for patients with AATD-LD. We have been preparing alvelestat for a global Phase 3 study, backed by positive efficacy data from two Phase 2 studies. We believe Sentynl’s commitment to rare diseases and established commercial infrastructure make them the ideal partner for alvelestat and look forward to collaborating with them during the option period, when we plan to refine the global Phase 3 study design,” said Denise Scots-Knight, Chief Executive Officer of Mereo BioPharma.

“This partnership marks a pivotal moment for Sentynl’s rare disease strategy. Mereo’s alvelestat is a highly promising, differentiated candidate that meaningfully expands our portfolio and has the potential to address an area of significant unmet need,” said Dr. Sharvil P. Patel, Managing Director, Zydus Lifesciences Limited. “AATD-LD has a profound impact on patients' lives. If approved, alvelestat has the potential to be a meaningful new option that could help their quality of life.”

“We take great pride in having built a sustainable approach for developing therapies for ultra-rare conditions, and this partnership allows us to expand that strategic focus to a larger population within the rare disease community, enabling us to help more people,” said Matt Heck, Chief Executive Officer of Sentynl Therapeutics. “For patients with AATD-LD, the current standard of care is demanding, often relying on generalized therapies or frequent intravenous treatments. We see a clear opportunity to improve upon that with alvelestat. Mereo has built a strong foundation for this asset, making them an ideal partner as we collaborate during the option period to prepare for the next phase of development.”

Mereo will receive a non-refundable option fee from Sentynl and, on exercise of the option, the Company would also receive $40 million in upfront and R&D payments. Under these terms, Mereo would also be eligible to receive up to $435 million in regulatory and commercial milestone payments, as well as double-digit tiered royalties on U.S. net sales of alvelestat. Mereo will lead the global Phase 3 study and regulatory interactions until the study is completed. However, during the option period, the companies will collaborate to advance manufacturing and streamline the Phase 3 study design.

About Alpha-1 Antitrypsin Deficiency-Associated Lung Disease (AATD-LD)

AATD is a rare, genetic disease that results in a deficiency of the alpha-1 antitrypsin protein, which protects the lungs against damaging enzymes that the body releases during inflammation. The majority of individuals with severe deficiency develop pulmonary emphysema, a progressive, life-threatening lung disease, which results in severe shortness of breath, chronic cough and sputum production with susceptibility to acute exacerbations. Individuals with AATD may also develop asthma and bronchiectasis, a permanent enlargement of parts of the lungs’ airways. The estimated prevalence of AATD-LD (Pi*ZZ variant) in the United States is approximately 50,000-80,000 people.1,2,3,4,5,6

About Alvelestat

Alvelestat is a novel, oral small molecule designed to specifically inhibit neutrophil elastase (NE), a key enzyme involved in inflammation and the destruction of lung tissue. As a small molecule, alvelestat is able to access both cell-bound and soluble elastase and effectively penetrate lung tissue. The safety and tolerability profile of alvelestat has been established through clinical trials in over 1,000 patients with respiratory diseases, including AATD-LD, COPD, bronchiectasis, cystic fibrosis, COVID-19 and bronchiolitis obliterans syndrome following allogeneic stem cell transplant.

Alvelestat has received Orphan Drug Designation for AATD-LD from the European Commission and the FDA. It has also received Fast Track designation from the FDA.

About Mereo BioPharma

Mereo BioPharma is a biopharmaceutical company focused on the development of innovative therapeutics for rare diseases. The Company has three rare disease product candidates: setrusumab for the treatment of osteogenesis imperfecta (OI); alvelestat for the treatment of alpha-1 antitrypsin deficiency-associated lung disease (AATD-LD); and vantictumab for the treatment of autosomal dominant osteopetrosis type 2 (ADO2). The Company and its partner for setrusumab, Ultragenyx Pharmaceutical Inc., have reported top-line results from two Phase 3 studies for setrusumab in OI in patients aged 2 to 25 years old. Ultragenyx is funding and leading global development and Mereo has retained EU and UK commercial rights. Mereo has entered into an exclusive option and license agreement with Sentynl Therapeutics Inc. for the U.S. rights commercialize alvelestat, while retaining rest of the world rights and will lead the global development. The agreement also grants Sentynl global rights to manufacture alvelestat for AATD-LD. Mereo has partnered with āshibio, Inc., for vantictumab in ADO2. āshibio, Inc. is funding and leading the global development program and Mereo has retained EU and UK commercial rights. Mereo has also entered into exclusive global license agreements with ReproNovo SA, for the development and commercialization of leflutrozole for the treatment of infertility in men, and with Feng Biosciences for the development and commercialization of navicixizumab for late-stage ovarian cancer.

For more information visit https://www.mereobiopharma.com/

About Zydus Lifesciences Limited

Zydus Lifesciences Ltd., is an innovative, global life sciences company that discovers, develops, manufactures, and markets a broad range of healthcare therapies. The group employs over 30,000 people worldwide, including 1,500 scientists engaged in R & D, and is driven by its mission to unlock new possibilities in life sciences through quality healthcare solutions that impact lives. The group aspires to transform lives through pathbreaking discoveries. Over the last decade, Zydus has introduced several innovative, first-in class products in the market for treating unmet healthcare needs with vaccines, therapeutics, biologicals, and New Chemical Entities. For more details visit www.zyduslife.com.

About Sentynl Therapeutics, Inc.

Sentynl Therapeutics Inc. (“Sentynl”) is a commercial stage U.S.-based biopharmaceutical company focused on bringing innovative therapies to patients living with rare diseases. Recognized for its commitment to the rare disease community, Sentynl leverages its global operations as well as its parent organization, Zydus Lifesciences Limited, to advance the development, manufacturing, and delivery of treatments to patients who need them in numerous countries worldwide. Sentynl is dedicated to improving patient outcomes and access while upholding ethical standards and operating in compliance with applicable laws, regulations, and industry guidelines. For more information, visit www.sentynl.com.

Forward-Looking Statements

This press release contains “forward-looking statements” that involve substantial risks and uncertainties, as well as assumptions that, if they never materialize or prove incorrect, could cause our results to differ materially from those expressed or implied by such forward-looking statements. All statements other than statements of historical fact contained herein are forward-looking statements within the meaning of Section 27A of the United States Securities Act of 1933, as amended, and Section 21E of the United States Securities Exchange Act of 1934, as amended. Forward-looking statements reflect our current expectations, beliefs and assumptions concerning future events or our future 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. Risks and uncertainties include, among other things, the uncertainties inherent in the clinical development process; the Company’s reliance on third parties to conduct and provide funding for its clinical trials; the sufficiency of existing cash to fund operations and/or the inability to raise additional funding on favorable terms or at all; the uncertainty inherent in regulatory review processes, including varying interpretations and analyses of data from clinical trials; the Company’s dependence on enrollment of patients in its clinical trials; potentially smaller than anticipated market opportunities for the Company's product candidates; the Company’s dependence on its key executives; the Company’s dependence on its strategic partners; and the Company’s ability to maintain compliance with Nasdaq continued listing requirements.

You should carefully consider the foregoing factors and the other risks and uncertainties that affect the Company’s business, including those described in the “Risk Factors” section of its Annual Report on Form 10-K, as well as discussions of potential risks, uncertainties, and other important factors in the Company’s subsequent filings with the Securities and Exchange Commission. Forward-looking statements are often identified by the words “believe,” “expect,” “anticipate,” “plan,” “intend,” “foresee,” “should,” “would,” “could,” “may,” “estimate,” “outlook,” “will,” “continue” and similar expressions, including the negative thereof. The absence of these words, however, does not mean that the statements are not forward-looking. These forward-looking statements are based on the Company’s current expectations, beliefs and assumptions concerning future developments and business conditions and their potential effect on the Company. While management believes that these forward-looking statements are reasonable as and when made, there can be no assurance that future developments affecting the Company will be those that it anticipates. The Company wishes to caution you not to place undue reliance on any forward-looking statements, which speak only as of the date hereof. The Company undertakes no obligation to publicly update or revise any of our forward-looking statements after the date they are made, whether as a result of new information, future events or otherwise, except to the extent required by law.

[1] Blanco I, Diego I, Castañón C, Estimated Worldwide Prevalence of the PI*ZZ Alpha-1 Genotype Antitrypsin in Subjects with Chronic Obstructive Pulmonary Disease. Archivos de Bronconeumología. 2023 Jul 10.1016 427-434;

[2] Blanco I, Bueno P, Diego I, et al. Alpha-1 antitrypsin PiZ gene frequency and PiZZ genotype numbers worldwide: an update. Int J Chron Obstruct Pulmon Dis. 2017;12:561-569.

[3] de Serres FJ, Blanco I, Fernández-Bustillo E. Estimating the risk for alpha-1 antitrypsin deficiency among COPD patients: Evidence supporting targeted screening. COPD. 2006;3(3):133-139.

[4] Stoller JK, Aboussouan LS. AAT deficiency. Lancet. 2005;365(9478):2225-2236.

[5] U.S. Census Bureau. QuickFacts: United States. U.S. Department of Commerce; 2023. Accessed Aug. 4, 2026. https://www.census.gov/quickfacts

[6] U.S. Census Bureau. B02001: Race, 2022 American Community Survey 1-Year Estimates. U.S. Department of Commerce; 2022. Accessed Aug. 4, 2026. https://data.census.gov/

Investor Contacts

Mereo BioPharma

Denise Scots-Knight, Chief Executive Officer

Christine Fox, Chief Financial Officer

+44 (0)333 023 7300

investors@mereobiopharma.com

Sentynl Therapeutics, Inc.

Media: Maureen Roberts, maureen.roberts@omc.com Sentynl: Michael Hercz, ir@sentynl.com Zydus Lifesciences Limited

Media: Sujatha Rajesh; sujatha.rajesh@zyduslife.com; +91-9974051180 Investor Relations: Arvind Bothra, arvind.bothra@zyduslife.com, +91-7045656895

Filing Exhibits & Attachments

2 documents

Press Releases

• EX-99.1 EX-99.1 37.1 KB

Other Documents

• EX-101 XBRL TAXONOMY EXTENSION SCHEMA WITH EMBEDDED LINKBASES DOCUMENT 56.9 KB