X0508 4 2026-03-05 0 0001736297 Astera Labs, Inc. ALAB 0001277624 LAZAR JACK R C/O ASTERA LABS, INC. 2345 NORTH FIRST STREET SAN JOSE CA 95131 1 0 0 0 1 Common Stock 2026-03-05 4 S 0 1601 118.1473 D 93250 D Common Stock 2026-03-05 4 S 0 3167 119.4934 D 90083 D Common Stock 2026-03-05 4 S 0 1200 120.222 D 88883 D Common Stock 2026-03-05 4 S 0 1035 121.3046 D 87848 D Common Stock 2026-03-05 4 S 0 212 122.0191 D 87636 D Common Stock 2026-03-05 4 S 0 285 123.50 D 87351 D The sales reported in this Form 4 occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 2, 2025. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $117.6400 to $118.6200, 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 $118.7700 to $119.6700, 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 $119.8100 to $120.7600, 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 $120.8800 to $121.8000, 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 $121.9100 to $122.0800, 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. /s/ Philip Mazzara, Attorney-in-Fact 2026-03-09