TN-201 Received Orphan Medicinal Product Designation from the European Commission

Preclinical TN-401 Data Presented at Heart Rhythm 2022

Tenaya Therapeutics, Inc. (NASDAQ: TNYA), a biotechnology company with a mission to discover, develop and deliver potentially curative therapies that address the underlying causes of heart disease, today provided business and program updates, and reported financial results for the first quarter ended March 31, 2022.

“Tenaya continues to advance a broad pipeline of potentially first-in-class programs for both rare and prevalent forms of heart disease,” said Faraz Ali, Chief Executive Officer of Tenaya. “Our progress is measurable across all aspects of our business. We recently presented encouraging preclinical data for our emerging gene therapy program, TN-401, being developed for the treatment of genetic arrhythmogenic right ventricular cardiomyopathy. Our IND-enabling efforts for TN-201 and TN-301 are on track, as are efforts for our cGMP manufacturing facility to become operational. We are also pleased to announce that TN-201 has been granted orphan drug designation in Europe.”

Recent Business and Program Updates

TN-201 – MYBPC3 Gene Therapy Program for Genetic Hypertrophic Cardiomyopathy (HCM)

• TN-201 received Orphan Medicinal Product designation from the European Commission for the treatment of HCM due to mutations in the MYBPC3 gene. TN-201 has also received Orphan Drug Designation from the U.S. Food and Drug Administration (FDA).
• Tenaya expects to submit an Investigational New Drug (IND) application for TN-201 to the FDA in the second half of 2022.

TN-401 – PKP2 Gene Therapy Program for Genetic Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC)

• Tenaya presented preclinical data at the Heart Rhythm Society’s annual Heart Rhythm 2022 meeting for its investigational PKP2 gene therapy, TN-401. In a preclinical study using a Pkp2 knockout mouse model to assess prevention of disease onset and progression, a single dose of PKP2 gene therapy restored heart function, reduced the occurrence of severe arrythmia, prevented adverse remodeling and fibrosis, and significantly increased survival.
• Tenaya expects to submit an IND application for TN-401 to the FDA in 2023.

TN-301 – HDAC6 Small Molecule Inhibitor for Heart Failure with Preserved Ejection Fraction (HFpEF)

• Tenaya expects to submit an IND application for TN-301 to the FDA in the second half of 2022.

cGMP Manufacturing Facility

• Tenaya expects its state-of-the-art, modular cGMP manufacturing facility in Union City, California, will become operational in the first half of 2022.

First Quarter 2022 Financial Highlights

• Cash Position: As of March 31, 2022, cash, cash equivalents and investments in marketable securities (current and noncurrent) were $213.5 million. Tenaya expects current cash, cash equivalents and investments in marketable securities (current and noncurrent) will be sufficient to fund its current operating plan at least into the second half of 2023.
• Research & Development (R&D) Expenses: R&D expenses for the first quarter ended March 31, 2022, were $24.2 million. Non-cash stock-based compensation included in R&D expense was $1.0 million for the first quarter ended March 31, 2022.
• General & Administrative (G&A) Expenses: G&A expenses for the first quarter ended March 31, 2022, were $7.0 million. Non-cash stock-based compensation included in G&A expense was $1.1 million for the first quarter ended March 31, 2022.
• Net Loss: Net loss for the first quarter ended March 31, 2022, was $31.1 million, or $0.75 per share.

About Tenaya Therapeutics

Tenaya Therapeutics is a biotechnology company committed to a bold mission: to discover, develop and deliver curative therapies that address the underlying drivers of heart disease. Founded by leading cardiovascular scientists from Gladstone Institutes and the University of Texas Southwestern Medical Center, Tenaya is developing therapies for rare genetic cardiovascular disorders, as well as for more prevalent heart conditions, through three distinct but interrelated product platforms: Gene Therapy, Cellular Regeneration and Precision Medicine. For more information, visit www.tenayatherapeutics.com.

Forward-Looking Statements

This press release contains forward-looking statements as that term is defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Statements in this press release that are not purely historical are forward-looking statements. Words such as “potentially,” “on track”, “expects”, “will,” and similar expressions are intended to identify forward-looking statements. Such forward-looking statements include, among other things, statements regarding the breadth, timing and therapeutic potential of Tenaya’s pipeline; statements regarding IND enabling activities for TN-201 and TN-301 and the cGMP manufacturing facility; the expected timing for submission of IND applications for TN-201, TN-401 and TN-301; the sufficiency of projected cash flows; and statements by Tenaya’s chief executive officer. The forward-looking statements contained herein are based upon Tenaya’s current expectations and involve assumptions that may never materialize or may prove to be incorrect. These forward-looking statements are neither promises nor guarantees and are subject to a variety of risks and uncertainties, including but not limited to: risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics and operating as an early stage company; Tenaya’s ability to develop, initiate or complete preclinical studies and clinical trials, and obtain approvals, for any of its product candidates; the timing, progress and results of preclinical studies for TN-201, TN-301, TN-401 and Tenaya’s other programs; Tenaya’s ability to raise any additional funding it will need to continue to pursue its business and product development plans; negative impacts of the COVID-19 pandemic on Tenaya’s manufacturing and operations, including preclinical studies and planned clinical trials; the timing, scope and likelihood of regulatory filings and approvals; the potential for any clinical trial results to differ from preclinical, interim, preliminary, topline or expected results; Tenaya’s manufacturing, commercialization and marketing capabilities and strategy; the loss of key scientific or management personnel; competition in the industry in which Tenaya operates; Tenaya’s reliance on third parties; Tenaya’s ability to obtain and maintain intellectual property protection for its product candidates; general economic and market conditions; and other risks. Information regarding the foregoing and additional risks may be found in the section entitled “Risk Factors” in documents that Tenaya files from time to time with the Securities and Exchange Commission. These forward-looking statements are made as of the date of this press release, and Tenaya assumes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

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