Astera Labs (ALAB) General Counsel sells 796 shares in open-market trade

Rhea-AI Filing Summary

Astera Labs, Inc. General Counsel and Secretary Philip Mazzara reported an open-market sale of 796 shares of Common Stock on May 21, 2026, at an average price of $291.0251 per share. Following this transaction, he continues to hold 103,343 shares directly.

Insider Trade Summary

Net Seller: 796 shares ($231,656)

Net Sell 1 txn

Insider Mazzara Philip

Role General Counsel and Secretary

Sold 796 shs ($232K)

Type	Security	Shares	Price	Value
Sale	Common Stock	796	$291.0251	$232K

Holdings After Transaction: Common Stock — 103,343 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 796 shares Sale price per share: $291.0251 per share Shares held after transaction: 103,343 shares +2 more

5 metrics

Shares sold 796 shares Open-market sale on May 21, 2026

Sale price per share $291.0251 per share Common Stock transaction

Shares held after transaction 103,343 shares Direct ownership after sale

Transaction code S Sale in open market or private transaction

Transaction direction sell Reported in Form 4 transaction details

Key Terms

Common Stock, open-market sale, Form 4, transaction code "S"

4 terms

Common Stock financial

"796 shares of Common Stock were sold in the reported transaction."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

open-market sale financial

"The filing describes the transaction as an open-market sale of shares."

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Form 4 regulatory

"The insider transaction was disclosed in a Form 4 report."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

transaction code "S" regulatory

"Transaction code "S" indicates a sale in open market or private transaction."

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mazzara Philip

(Last) (First) (Middle)

C/O ASTERA LABS, INC.

2345 NORTH FIRST STREET

(Street)

SAN JOSE CALIFORNIA 95131

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Astera Labs, Inc. [ ALAB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	General Counsel and Secretary

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/21/2026		S		796	D	$291.0251	103,343	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Philip Mazzara	05/26/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Astera Labs (ALAB) report for Philip Mazzara?

Astera Labs General Counsel and Secretary Philip Mazzara reported selling 796 shares of Common Stock in an open-market transaction. The sale occurred on May 21, 2026, and was disclosed in a Form 4 insider trading report filed with regulators.

At what price did Philip Mazzara sell Astera Labs (ALAB) shares?

Philip Mazzara sold 796 Astera Labs Common Stock shares at an average price of $291.0251 per share. This price reflects the transaction value reported in the Form 4 and is based on the executed open-market sale on May 21, 2026.

How many Astera Labs (ALAB) shares does Philip Mazzara hold after this sale?

After selling 796 shares, Philip Mazzara directly holds 103,343 shares of Astera Labs Common Stock. This post-transaction holding figure is explicitly disclosed in the Form 4 and shows his remaining equity stake following the reported sale.

What is Philip Mazzara’s role at Astera Labs (ALAB)?

Philip Mazzara serves as General Counsel and Secretary of Astera Labs, Inc. His officer status is disclosed in the Form 4, which identifies him as an executive reporting person subject to insider trading reporting requirements under U.S. securities regulations.

Was the Astera Labs (ALAB) insider transaction an open-market sale?

Yes. The Form 4 describes the transaction as an open-market sale of Common Stock. It uses transaction code “S” and labels the action as an open-market sale, indicating the shares were sold through regular trading rather than a private or derivative transaction.