X0609 4 2026-06-24 0 0001736297 Astera Labs, Inc. ALAB 0001405693 Mayer Bethany false C/O ASTERA LABS, INC. 2345 NORTH FIRST STREET SAN JOSE CA 95131 1 0 0 0 1 Common Stock 2026-06-24 4 S 0 99 391.2689 D 6137 D Common Stock 2026-06-24 4 S 0 193 392.6746 D 5944 D Common Stock 2026-06-24 4 S 0 54 393.86 D 5890 D Common Stock 2026-06-24 4 S 0 146 396.4915 D 5744 D Common Stock 2026-06-24 4 S 0 165 398.3154 D 5579 D Common Stock 2026-06-24 4 S 0 29 399.96 D 5550 D Common Stock 839 I By Trust The sales reported in this Form 4 occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 25, 2024. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $391.1300 to $391.3800, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $392.1500 to $392.8300, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $396.0700 to $396.8350, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $398.0000 to $398.6100, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. These shares are owned directly by The Jantzen/Mayer Family 2002 Trust, of which the Reporting Person is a trustee. The Reporting Person disclaims beneficial ownership of these securities, except to the extent, if any, of her pecuniary interest therein, and the filing of this Form 4 is not an admission that the Reporting Person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose. /s/ Philip Mazzara, Attorney-in-Fact 2026-06-26