Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Beck Peter 2. Issuer Name and Ticker or Trading Symbol Rocket Lab Corp [RKLB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President, CEO and Chairman (Last) (First) (Middle) C/O ROCKET LAB USA, INC., 3881 MCGOWEN STREET 3. Date of Earliest Transaction (Month/Day/Year) 09/15/2025 (Street) LONG BEACH, CA 90808 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) 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 09/15/2025 S 329,621(1) D $53.5413(2) 4,670,379 I By Trust(3) Common Stock 09/15/2025 S 699,956(1) D $54.1653(4) 3,970,423 I By Trust(3) Common Stock 09/15/2025 S 33,981(1) D $54.9573(5) 3,936,442 I By Trust(3) Common Stock 09/16/2025 S 541,708(1) D $48.0403(6) 3,394,734 I By Trust(3) Common Stock 09/16/2025 S 724,204(1) D $48.8984(7) 2,670,530 I By Trust(3) Common Stock 09/16/2025 S 111,298(1) D $49.9823(8) 2,559,232 I By Trust(3) Common Stock 09/16/2025 S 47,055(1) D $50.8814(9) 2,512,177 I By Trust(3) Common Stock 09/16/2025 S 12,177(1) D $51.8102(10) 2,500,000 I By Trust(3) Common Stock 789,373 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	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 control number.		SEC 1474 (9-02)

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 Underlying Securities (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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Beck Peter C/O ROCKET LAB USA, INC. 3881 MCGOWEN STREET LONG BEACH, CA 90808	X		President, CEO and Chairman
Beck Kerryn C/O ROCKET LAB USA, INC. 3881 MCGOWEN STREET LONG BEACH, CA 90808				Voluntary Filer
Butler Warren C/O ROCKET LAB USA, INC. 3881 MCGOWEN STREET LONG BEACH, CA 90808				Voluntary Filer
Equatorial Trust C/O ROCKET LAB CORPORATION 3881 MCGOWEN STREET LONG BEACH, CA 90808				Voluntary Filer
Peek Street Equatorial Trustee Ltd C/O ROCKET LAB CORPORATION 3881 MCGOWEN STREET LONG BEACH, CA 90808				Voluntary Filer

Signatures

/s/ Adam Spice, as Attorney-in-Fact for Peter Beck		09/17/2025
**Signature of Reporting Person		Date
/s/ Adam Spice, as Attorney-in-Fact for Kerryn Beck		09/17/2025
**Signature of Reporting Person		Date
/s/ Adam Spice, as Attorney-in-Fact for Warren Butler		09/17/2025
**Signature of Reporting Person		Date
/s/ Adam Spice, as Attorney-in-Fact for Equatorial Trust		09/17/2025
**Signature of Reporting Person		Date
/s/ Adam Spice, as Attorney-in-Fact for Peek Street Equatorial Trustee Limited		09/17/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Represents the sale of shares which occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the Equatorial Trust (the "Trust") on June 13, 2025.
(2)	The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.7900 to $53.7875, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the 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)	These shares are held directly by the Trust. Peek Street Equatorial Trustee Limited (the "Trustee") is the trustee of the Trust and each of Peter Beck, Kerryn Beck and Warren Butler serve as a director of the Trustee with shared voting and investment control of the shares and, as a result, the Trustee and each such individual is deemed to be an indirect beneficial owner of these securities. Each reporting person disclaims beneficial ownership of these securities, except to the extent, if any, of his, her or its pecuniary interest therein, and the filing of this Form 4 is not an admission that any reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.
(4)	The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.7900 to $54.7800, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the 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. These shares were sold in multiple transactions at prices ranging from $54.7900 to $55.1600, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the 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. These shares were sold in multiple transactions at prices ranging from $47.4100 to $48.4050, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the 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. These shares were sold in multiple transactions at prices ranging from $48.4100 to $49.4050, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the 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. These shares were sold in multiple transactions at prices ranging from $49.4100 to $50.4050, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the 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. These shares were sold in multiple transactions at prices ranging from $50.4100 to $51.4000, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the 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.
(10)	The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $51.4100 to $52.0500, inclusive. The reporting persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the 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.

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