Astera Labs Director Manuel Alba Files Form 144 Notice to Sell $50.5M in Common Stock

Form 144 Filing Analysis: Astera Labs, Inc. ($ALAB)

Executive Summary

Director Manuel Alba, on behalf of the Mar 2011 Childrens Trust, filed a Form 144 notice on September 1, 2026, indicating an intent to sell up to 170,000 shares of Astera Labs Common Stock with an estimated aggregate market value of $50,486,600.00 (approx. $296.98 per share).

Key Details

• Issuer: Astera Labs, Inc. (CIK: 0001736297)
• Reporting Owner: Manuel Alba (Director, CIK: 0001134727)
• Selling Account: Mar 2011 Childrens Trust
• Securities Offered: 170,000 Common Shares
• Aggregate Market Value: $50,486,600.00
• Shares Outstanding: 173,485,104
• Transaction Broker: Morgan Stanley Smith Barney LLC
• Rule 10b5-1 Plan Adoption Date: May 22, 2026
• Original Acquisition: Acquired directly from Issuer on March 21, 2018, via private acquisition for cash.

Prior Sales in Past 3 Months

Related entities and trusts associated with Manuel Alba have engaged in significant selling activity over the past 90 days:

• 07/01/2026 (Mar 2011 Childrens Trust): 170,000 shares sold for gross proceeds of $75,457,826.00
• 07/01/2026 (Casa Alameda 2007, LLC): 33,000 shares sold for gross proceeds of $14,647,723.80
• 07/01/2026 (Alba 2003 Living Trust): 150,000 shares sold for gross proceeds of $66,580,578.00

Trading & Market Significance

This filing represents a high-dollar-value divestment (~$50.5M) representing approximately 0.10% of total shares outstanding. Given the pre-arranged Rule 10b5-1 plan adopted in May 2026, the sale follows a programmatic liquidation schedule rather than discretionary, opportunistic selling.