X0508 4 2026-01-02 0 0001736297 Astera Labs, Inc. ALAB 0001998163 Mazzara Philip C/O ASTERA LABS, INC. 2345 NORTH FIRST STREET SAN JOSE CA 95131 0 1 0 0 General Counsel and Secretary 1 Common Stock 2026-01-02 4 S 0 100 172.65 D 146940 D Common Stock 2026-01-02 4 S 0 600 174.1283 D 146340 D Common Stock 2026-01-02 4 S 0 1100 174.9773 D 145240 D Common Stock 2026-01-02 4 S 0 500 176.92 D 144740 D Common Stock 2026-01-02 4 S 0 2304 178.3094 D 142436 D Common Stock 2026-01-02 4 S 0 2577 179.1146 D 139859 D Common Stock 2026-01-02 4 S 0 1319 179.9021 D 138540 D Common Stock 2026-01-02 4 S 0 1300 180.9815 D 137240 D Common Stock 2026-01-02 4 S 0 200 182.12 D 137040 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 $173.6900 to $174.6700, 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 $174.7000 to $175.4500, 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 $176.5100 to $177.4900, 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 $177.5900 to $178.5700, 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 $178.6600 to $179.5900, 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 $179.6600 to $180.2600, 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 $180.6600 to $181.4900, 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 $181.7500 to $182.4900, 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 2026-01-06