aTyr Pharma to be Added to the Russell 2000® and Russell 3000® Indexes

SAN DIEGO, June 26, 2025 (GLOBE NEWSWIRE) -- aTyr Pharma, Inc. (Nasdaq: ATYR) (“aTyr” or the “Company”), a clinical stage biotechnology company engaged in the discovery and development of first-in-class medicines from its proprietary tRNA synthetase platform, today announced that the Company is expected to be added to the Russell 2000® Index and broad market Russell 3000® Index, effective after the U.S. market close on June 27, 2025, as part of the 2025 Russell U.S. Indexes annual reconstitution. The Russell 3000® Index tracks the performance of the largest 3,000 publicly traded U.S. companies and serves as a broad benchmark for the U.S. equity market. The Russell 2000® Index is a subset of the Russell 3000® Index that tracks small-cap companies in the U.S. equities market. Membership in the Russell Indexes lasts for one year and results in automatic inclusion in appropriate growth and value style indexes. FTSE Russell determines membership for its Russell Indexes primarily by objective, market-capitalization rankings and style attributes. The Russell Indexes are used by investment managers and institutional managers for index funds and as benchmarks for active investment strategies. Russell Indexes are part of FTSE Russell, a leading global index provider. For more information on the Russell Indexes and the annual reconstitution, visit the “Russell Reconstitution” section on the FTSE Russell website. About aTyr aTyr is a clinical stage biotechnology company leveraging evolutionary intelligence to translate tRNA synthetase biology into new therapies for fibrosis and inflammation. tRNA synthetases are ancient, essential proteins that have evolved novel domains that regulate diverse pathways extracellularly in humans. aTyr’s discovery platform is focused on unlocking hidden therapeutic intervention points by uncovering signaling pathways driven by its proprietary library of domains derived from all 20 tRNA synthetases. aTyr’s lead therapeutic candidate is efzofitimod, a first-in-class biologic immunomodulator in clinical development for the treatment of interstitial lung disease, a group of immune-mediated disorders that can cause inflammation and progressive fibrosis, or scarring, of the lungs. For more information, please visit www.atyrpharma.com. Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are usually identified by the use of words such as "anticipate," “believes,” “designed,” “could,” “can,” “expects,” “intends,” “may,” “plans,” “potential,” “will,” and variations of such words or similar expressions. We intend these forward-looking statements to be covered by such safe harbor provisions for forward-looking statements and are making this statement for purposes of complying with those safe harbor provisions. These forward-looking statements include, among others, statements regarding the Company’s expected inclusion in the Russell 2000® and 3000® Indexes; and certain development goals. These forward-looking statements also reflect our current views about our plans, intentions, expectations, strategies and prospects, which are based on the information currently available to us and on assumptions we have made. Although we believe that our plans, intentions, expectations, strategies and prospects, as reflected in or suggested by these forward-looking statements, are reasonable, we can give no assurance that the plans, intentions, expectations, strategies or prospects will be attained or achieved. All forward-looking statements are based on estimates and assumptions by our management that, although we believe to be reasonable, are inherently uncertain. Furthermore, actual results may differ materially from those described in these forward-looking statements and will be affected by a variety of risks and factors that are beyond our control including, without limitation, uncertainty regarding geopolitical and macroeconomic events, risks associated with the discovery, development and regulation of efzofitimod, the risks associated with clinical trials generally, the risk that future findings may not reflect the findings from the interim analysis discussed above, the risk that we or our partners may cease or delay preclinical or clinical development activities for efzofitimod for a variety of reasons (including difficulties or delays in patient enrollment in planned clinical trials), the possibility that existing collaborations could be terminated early, and the risk that we may not be able to raise the additional funding required for our business and product development plans, as well as those risks set forth in our most recent Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and in our other SEC filings. Except as required by law, we assume no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise. Contact:Ashlee DunstonSr. Director, Investor Relations and Public Affairsadunston@atyrpharma.com

aTyr Pharma to be Added to the Russell 2000® and Russell 3000® Indexes

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