Atreca Presents Data from Ongoing Phase 1b Study of ATRC-101 in Patients with Select Advanced Solid Tumors during Oral Abstract Session at the ASCO 2023 Annual Meeting - Seite 2

About Atreca, Inc.

Atreca is a biopharmaceutical company developing novel antibody-based immunotherapeutics generated by its differentiated discovery platform. Atreca's platform allows access to an unexplored landscape in oncology through the identification of unique antibody-target pairs generated by the human immune system during an active immune response against tumors. These antibodies provide the basis for first-in-class therapeutic candidates, such as our lead product candidate ATRC-101. A Phase 1b study evaluating ATRC-101 in multiple solid tumor cancers is currently enrolling patients. For more information on Atreca, please visit www.atreca.com.

Forward-Looking Statements

This release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include without limitation those regarding our strategy and future plans, including statements regarding the continuing safety and tolerability of ATRC-101 in our ongoing Phase 1b trial, enrollment of patients in our Phase 1b clinical trial of ATRC-101, our belief that our ATRC-101 results validate the potential of our discovery platform and its ability to identify promising therapeutic antibodies against novel tumor targets, our plan to make go/no-go decisions by the end of 2023 for potential Phase 2 development of ATRC-101, the development of ATRC-101 and our clinical and regulatory plans, and the timing thereof, data read-outs and the timing thereof, including the reporting of updated data from the monotherapy and pembrolizumab combination arms of our Phase 1b clinical trial of ATRC-101, the continuing correlation between longer progression-free survival and high target expression in our Phase 1b clinical trial of ATRC-101, and the potential of ATRC-101 to address a significant unmet need in multiple tumor types as a part of a range of potential therapeutic combinations with established regimens, including checkpoint inhibitors. These forward-looking statements include, but are not limited to, statements about our plans, objectives, representations and contentions and are not historical facts and typically are identified by use of terms such as “continue,” “will,” “expect,” “advance,” “target,” “belief,” and similar words, although some forward-looking statements are expressed differently. Our actual results may differ materially from those indicated in these forward-looking statements due to risks and uncertainties related to the initiation, timing, progress and results of our research and development programs, preclinical studies, clinical trials, regulatory submissions, and other matters that are described in our most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (SEC) and available on the SEC's website at www.sec.gov, including the risk factors set forth therein. Investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release, and we undertake no obligation to update any forward-looking statement in this press release, except as required by law.