Astera Labs (ALAB) counsel pre-plans sale of 10,000 shares

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Astera Labs, Inc. General Counsel and Secretary Philip Mazzara sold a total of 10,000 shares of common stock in open-market transactions on April 1, 2026, at weighted average prices ranging from just over $105 to about $111 per share.

The filing notes these sales occurred automatically under a pre-arranged Rule 10b5-1 trading plan adopted on May 29, 2025. Following the transactions, Mazzara continues to hold 118,584 shares of Astera Labs common stock directly.

Insider Trade Summary 10b5-1

Net Seller: 10,000 shares ($1,077,663)

Net Sell 5 txns

Insider Mazzara Philip

Role General Counsel and Secretary

Sold 10,000 shs ($1.08M)

Type	Security	Shares	Price	Value
Sale	Common Stock	3,100	$106.3426	$330K
Sale	Common Stock	1,985	$107.5416	$213K
Sale	Common Stock	3,415	$108.4046	$370K
Sale	Common Stock	1,000	$109.156	$109K
Sale	Common Stock	500	$110.346	$55K

Holdings After Transaction: Common Stock — 124,984 shares (Direct)

Footnotes (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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $105.8600 to $106.8500, 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $106.8900 to $107.8500, 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $107.8900 to $108.8800, 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 $108.9100 to $109.6100, 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. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $110.0200 to $111.0100, 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.

Key Figures

Shares sold: 10,000 shares Post-transaction holdings: 118,584 shares Transaction price example: $107.5416 per share +1 more

4 metrics

Shares sold 10,000 shares Total common stock sold on April 1, 2026

Post-transaction holdings 118,584 shares Common stock held directly after final reported sale

Transaction price example $107.5416 per share Weighted average price for one sale block of 1,985 shares

Transaction price example $110.3460 per share Weighted average price for one sale block of 500 shares

Key Terms

Rule 10b5-1 trading plan, weighted average price, open-market sale, U.S. Securities and Exchange Commission

4 terms

Rule 10b5-1 trading plan regulatory

"The sales reported in this Form 4 occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

open-market sale financial

"transaction_action: "open-market sale" and transaction_code_description: "Sale in open market or private transaction""

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.

U.S. Securities and Exchange Commission regulatory

"the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold"

The U.S. Securities and Exchange Commission is a government agency responsible for overseeing the stock market and protecting investors. It sets rules to ensure that companies share truthful information and that trading is fair, helping to maintain trust in the financial system. This oversight is important because it helps prevent fraud and ensures that investors can make informed decisions.

Form 4 Insider Transactions: What Each Field Means →

04/03/2026 - 06:31 PM

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)
04/01/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/01/2026		S⁽¹⁾		3,100	D	$106.3426⁽²⁾	124,984	D
Common Stock	04/01/2026		S⁽¹⁾		1,985	D	$107.5416⁽³⁾	122,999	D
Common Stock	04/01/2026		S⁽¹⁾		3,415	D	$108.4046⁽⁴⁾	119,584	D
Common Stock	04/01/2026		S⁽¹⁾		1,000	D	$109.156⁽⁵⁾	118,584	D
Common Stock	04/01/2026		S⁽¹⁾		500	D	$110.346⁽⁶⁾	118,084	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 $105.8600 to $106.8500, 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.

3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $106.8900 to $107.8500, 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 $107.8900 to $108.8800, 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 $108.9100 to $109.6100, 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.

6. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $110.0200 to $111.0100, 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	04/03/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did Astera Labs (ALAB) insider Philip Mazzara do in this Form 4?

Philip Mazzara, General Counsel and Secretary of Astera Labs, sold 10,000 shares of common stock in open-market transactions. These trades occurred on April 1, 2026, and were executed automatically under a pre-arranged Rule 10b5-1 trading plan.

How many Astera Labs (ALAB) shares did the insider sell and at what prices?

Mazzara sold 10,000 Astera Labs common shares in several trades at weighted average prices. Individual transactions reported averages such as $106.3426, $107.5416, $108.4046, $109.1560, and $110.3460 per share, within detailed price ranges noted in the footnotes.

Does Philip Mazzara still hold Astera Labs (ALAB) shares after these sales?

Yes. After the reported open-market sales, Mazzara continues to directly own 118,584 shares of Astera Labs common stock. This figure reflects his holdings following the final transaction reported for April 1, 2026 in the Form 4 filing.

Were the Astera Labs (ALAB) insider sales made under a Rule 10b5-1 plan?

Yes. The filing states the sales occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by Mazzara on May 29, 2025. Such plans pre-schedule trades, reducing the significance of short-term market timing in interpreting insider activity.

What does the weighted average price disclosure mean in this Astera Labs (ALAB) Form 4?

Weighted average price means each reported price is an average for multiple trades within a specified range. Footnotes explain shares were sold in numerous transactions across stated price bands, and the insider offers to provide exact trade breakdowns upon legitimate request.