[Form 4] Astera Labs, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Philip Mazzara, General Counsel and Secretary of Astera Labs, Inc. (ALAB), reported automatic sales of 10,000 shares of the company's common stock on 10/01/2025 under a Rule 10b5-1 trading plan adopted on May 29, 2025. The Form 4 lists nine sell transactions executed the same day at weighted average prices for each block, with reported price ranges across the trades from $186.67 up to $195.48. Following the reported sales, the filing shows the reporting person beneficially owns 151,573 shares.

The Form 4 is signed by Mr. Mazzara on 10/03/2025 and contains explanatory footnotes stating the per-block prices are weighted averages and that detailed per-trade price breakdowns are available on request. No derivative securities are reported on this Form 4.

Positive

• 10,000 shares sold under a documented Rule 10b5-1 plan (adopted May 29, 2025)
• Filing discloses per-block weighted average prices and offers detailed per-trade pricing on request
• Form 4 was signed and filed promptly (signed 10/03/2025)

Negative

• Reporting person reduced direct beneficial ownership to 151,573 shares after sales
• Insider sales occurred across price ranges from $186.67 to $195.48, realizing proceeds (per-share amounts shown) that may be material to holder concentration

Insights

Insider Transactions Specialist

Insider sold 10,000 shares under a Rule 10b5-1 plan; holdings now 151,573 shares.

The filing documents nine sell transactions on 10/01/2025 executed automatically under a trading plan adopted on May 29, 2025. Aggregate sales equal 10,000 shares, with line-item weighted average prices reported and per-trade price ranges disclosed in footnotes.

This is routine disclosure of scheduled insider sales rather than open-market ad hoc trading; the presence of a 10b5-1 plan clarifies the transactions were pre-planned. The report also confirms no derivative holdings were changed.

Corporate Governance Analyst

Form 4 shows transparent, pre-arranged sales and timely reporting.

The report includes the plan adoption date (May 29, 2025) and the Form 4 was signed on 10/03/2025, indicating the insider followed required disclosure procedures. Footnotes provide price ranges and offer to supply per-trade detail on request, which supports transparency.

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

1. Name and Address of Reporting Person^*

Mazzara Philip

(Last) (First) (Middle)

C/O ASTERA LABS, INC.

2345 NORTH FIRST STREET

(Street)

SAN JOSE CA 95131

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

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

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

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

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	10/01/2025		S(1)		700	D	$187.2057(2)	160,873	D
Common Stock	10/01/2025		S(1)		800	D	$188.3688(3)	160,073	D
Common Stock	10/01/2025		S(1)		509	D	$189.8462(4)	159,564	D
Common Stock	10/01/2025		S(1)		1,395	D	$190.9717(5)	158,169	D
Common Stock	10/01/2025		S(1)		1,000	D	$192.2113(6)	157,169	D
Common Stock	10/01/2025		S(1)		2,407	D	$193.0792(7)	154,762	D
Common Stock	10/01/2025		S(1)		2,189	D	$194.0717(8)	152,573	D
Common Stock	10/01/2025		S(1)		900	D	$194.9489(9)	151,673	D
Common Stock	10/01/2025		S(1)		100	D	$195.66	151,573	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:

1. 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.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $186.6700 to $187.4900, 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.

3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $187.8600 to $188.8500, 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.

4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $189.3200 to $190.2900, 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.

5. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $190.4900 to $191.4400, 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.

6. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $191.6000 to $192.5900, 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.

7. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $192.6100 to $193.5300, 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.

8. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $193.6300 to $194.6100, 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.

9. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $194.6300 to $195.4800, 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.

Remarks:

	/s/ Philip Mazzara	10/03/2025
	** 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.

FAQ

What did Astera Labs (ALAB) insider Philip Mazzara report on Form 4?

The filing reports that Philip Mazzara sold 10,000 shares of ALAB common stock on 10/01/2025 under a Rule 10b5-1 trading plan.

When was the Rule 10b5-1 trading plan adopted for the sales reported by ALAB insider?

The Form 4 states the Rule 10b5-1 trading plan was adopted on May 29, 2025.

How many shares does the reporting person own after the reported transactions?

After the reported sales, the Form 4 shows the reporting person beneficially owns 151,573 shares.

What price range is disclosed for the shares sold in the ALAB Form 4?

Footnotes disclose per-trade price ranges; combined ranges across the reported blocks run from $186.67 to $195.48, with each block showing a weighted average price.

Were any derivative securities reported in this Form 4 for ALAB?

No; Table II for derivative securities shows no reported transactions or holdings in this filing.