X0609 4 2026-04-01 0 0001736297 Astera Labs, Inc. ALAB 0001134727 ALBA MANUEL false C/O ASTERA LABS, INC. 2345 NORTH FIRST STREET SAN JOSE CA 95131 1 0 0 0 1 Common Stock 2026-04-01 4 S 0 57001 106.3194 D 1517497 I By Alba Trust Common Stock 2026-04-01 4 S 0 24317 107.4443 D 1493180 I By Alba Trust Common Stock 2026-04-01 4 S 0 45668 108.3324 D 1447512 I By Alba Trust Common Stock 2026-04-01 4 S 0 15367 109.1027 D 1432145 I By Alba Trust Common Stock 2026-04-01 4 S 0 5060 110.2112 D 1427085 I By Alba Trust Common Stock 2026-04-01 4 S 0 2587 111.1412 D 1424498 I By Alba Trust Common Stock 2026-04-01 4 S 0 33000 107.6141 D 319863 I By Casa Alameda 2007, LLC Common Stock 5000 I By spouse Common Stock 2351 D The sales reported in this Form 4 occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 29, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $105.8500 to $106.8400, 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 Manuel Alba-Marquez in trust for Alba 2003 Living Trust (the "Alba Trust"), of which the Reporting Person and his spouse are co-trustees. The Reporting Person disclaims beneficial ownership of these securities, except to the extent, if any, of his 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $106.8500 to $107.8400, 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 $107.8500 to $108.8400, 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 $108.8500 to $109.8400, 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 $109.8500 to $110.8300, 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 $110.8500 to $111.2700, 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 $107.6124 to $107.6148, 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 Casa Alameda 2007, LLC, of which the Reporting Person is a manager. The Reporting Person disclaims beneficial ownership of these securities, except to the extent, if any, of his 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 2026-04-03