Astera Labs, Inc. (ALAB) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-18 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Astera Labs, Inc. (ALAB) CIK: 0001736297 --- Reporting Owner --- Name: Mazzara Philip CIK: 0001998163 Role: Officer (General Counsel and Secretary) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -9,204 | Price: $235.36 Total Value: $2,166,253.44 Shares Owned After: 109,011 | Ownership: D (Direct) [Transaction #2] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -990 | Price: $235.41 Total Value: $233,060.45 Shares Owned After: 108,021 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F2] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $235.9400 to $235.3600, 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. [Transaction #3] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -116 | Price: $233.19 Total Value: $27,049.65 Shares Owned After: 107,905 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F3] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $233.9800 to $233.1600, 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. [Transaction #4] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -99 | Price: $232.81 Total Value: $23,047.99 Shares Owned After: 107,806 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F4] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $232.9700 to $232.7700, 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. [Transaction #5] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -387 | Price: $231.31 Total Value: $89,517.98 Shares Owned After: 107,419 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F5] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $231.9000 to $230.9300, 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. [Transaction #6] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -186 | Price: $230.28 Total Value: $42,832.34 Shares Owned After: 107,233 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F6] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $230.79000 to $229.9400, 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. [Transaction #7] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -55 | Price: $229.54 Total Value: $12,624.50 Shares Owned After: 107,178 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F7] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $229.7900 to $228.9350, 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. [Transaction #8] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -275 | Price: $226.71 Total Value: $62,346.07 Shares Owned After: 106,903 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F8] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $227.2000 to $226.2800, 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. [Transaction #9] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -90 | Price: $225.76 Total Value: $20,318.42 Shares Owned After: 106,813 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F9] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $226.1800 to $225.2700, 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. [Transaction #10] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -35 | Price: $225.01 Total Value: $7,875.18 Shares Owned After: 106,778 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F10] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $225.0500 to $224.5000, 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. [Transaction #11] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -245 | Price: $223.75 Total Value: $54,817.60 Shares Owned After: 106,533 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F11] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $223.9900 to $223.3000, 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. [Transaction #12] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -189 | Price: $222.20 Total Value: $41,996.01 Shares Owned After: 106,344 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F12] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $222.6400 to $221.6800, 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. [Transaction #13] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -170 | Price: $221.01 Total Value: $37,571.05 Shares Owned After: 106,174 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F13] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $221.6400 to $220.6500, 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. [Transaction #14] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -274 | Price: $220.20 Total Value: $60,334.80 Shares Owned After: 105,900 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F14] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $220.5200 to $219.7000, 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. [Transaction #15] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -356 | Price: $218.87 Total Value: $77,916.97 Shares Owned After: 105,544 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F15] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $219.5100 to $218.5300, 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. [Transaction #16] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -364 | Price: $218.06 Total Value: $79,372.64 Shares Owned After: 105,180 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F16] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $218.5000 to $217.5400, 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. [Transaction #17] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -646 | Price: $216.97 Total Value: $140,163.91 Shares Owned After: 104,534 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F17] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $217.5000 to $216.5200, 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. [Transaction #18] Security: Common Stock Date: 2026-05-18 | Code: S (Open market sale) Shares: -395 | Price: $216.31 Total Value: $85,440.71 Shares Owned After: 104,139 | Ownership: D (Direct) Footnotes: [F1] Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. [F18] The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $216.4900 to $216.1000, 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. --- Footnotes (Complete Index) --- F1: Represents shares of the Issuer's Common Stock required to be sold by the Reporting Person to satisfy tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the Reporting Person. Such sales were automatic and mandated by an election of the Issuer made in advance of the vesting event to require the satisfaction of tax withholding obligations to be funded by a "sell to cover", and does not represent a discretionary trade by the Reporting Person. F10: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $225.0500 to $224.5000, 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. F11: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $223.9900 to $223.3000, 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. F12: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $222.6400 to $221.6800, 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. F13: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $221.6400 to $220.6500, 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. F14: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $220.5200 to $219.7000, 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. F15: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $219.5100 to $218.5300, 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. F16: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $218.5000 to $217.5400, 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. F17: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $217.5000 to $216.5200, 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. F18: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $216.4900 to $216.1000, 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. F2: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $235.9400 to $235.3600, 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. F3: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $233.9800 to $233.1600, 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. F4: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $232.9700 to $232.7700, 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. F5: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $231.9000 to $230.9300, 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. F6: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $230.79000 to $229.9400, 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. F7: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $229.7900 to $228.9350, 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. F8: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $227.2000 to $226.2800, 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. F9: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $226.1800 to $225.2700, 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. --- Signature --- /s/ /s/ Philip Mazzara (2026-05-20)