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 * Ocko Matthew 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 _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O ROCKET LAB CORPORATION, 3881 MCGOWEN STREET 3. Date of Earliest Transaction (Month/Day/Year) 09/16/2025 (Street) LONG BEACH, CA 90808 4. If Amendment, Date 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 (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 09/16/2025 S 303,076 D $47.4874(1) 779,977 I See Footnote(2) Common Stock 09/16/2025 S 745,239 D $47.4874(1) 1,917,900 I See Footnote(3) Common Stock 09/16/2025 S 138,901 D $48.5271(4) 641,076 I See Footnote(2) Common Stock 09/16/2025 S 341,545 D $48.5271(4) 1,576,355 I See Footnote(3) Common Stock 09/16/2025 S 67,409 D $49.2372(5) 573,667 I See Footnote(2) Common Stock 09/16/2025 S 165,753 D $49.2372(5) 1,410,602 I See Footnote(3) Common Stock 09/16/2025 S 12,993 D $50.2431(6) 560,674 I See Footnote(2) Common Stock 09/16/2025 S 31,948 D $50.2431(6) 1,378,654 I See Footnote(3) Common Stock 09/16/2025 S 9,000 D $51.7871(7) 551,674 I See Footnote(2) Common Stock 09/16/2025 S 22,130 D $51.7871(7) 1,356,524 I See Footnote(3) Common Stock 09/16/2025 S 10,148 D $52.2274(8) 541,526 I See Footnote(2) Common Stock 09/16/2025 S 24,955 D $52.2274(8) 1,331,569 I See Footnote(3) Common Stock 09/16/2025 J(9) 541,526 D $ 0 0 I See Footnote(2) Common Stock 09/16/2025 J(10) 1,331,569 D $ 0 0 I See Footnote(3) Common Stock 09/16/2025 J(11) 9,894 D $ 0 9,894 I Three Kingdoms Capital Partners, LP(12) Common Stock 09/16/2025 J(13) 164,026 D $ 0 164,026 I SST Capital Management, LLC(14)

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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
Ocko Matthew C/O ROCKET LAB CORPORATION 3881 MCGOWEN STREET LONG BEACH, CA 90808	X

Signatures

/s/ Matthew Ocko		09/18/2025
**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)	The price reported in column 4 is a weighted average price of the aggregate number of shares sold. These shares were sold in multiple transactions at prices ranging from $47.013 to $48.01, inclusive. The Reporting Person undertakes to provide to Rocket Lab Corporation (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 ranges set forth in this footnote.
(2)	Represents securities held of record by Data Collective IV, L.P. ("DCVC IV"). Data Collective IV GP, LLC ("DCVC IV GP") is the general partner of DCVC IV and has sole voting and dispositive power with regard to the securities held by DCVC IV. The Reporting Person is a managing member of DCVC IV GP and shares voting and dispositive power with respect to the securities held by DCVC IV. The Reporting Person disclaims the existence of a "group" and disclaims beneficial ownership of such securities and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of his indirect pecuniary interest therein, if any.
(3)	Represents securities held of record by DCVC Opportunity Fund II, L.P. ("DCVC Opportunity Fund II"). DCVC Opportunity Fund II GP, LLC ("DCVC Opportunity Fund II GP") is the general partner of DCVC Opportunity Fund II and has sole voting and dispositive power with regard to the securities held by DCVC Opportunity Fund II. The Reporting Person is a managing member of DCVC Opportunity Fund II GP and shares voting and dispositive power with respect to the securities held by DCVC Opportunity Fund II. The Reporting Person disclaims the existence of a "group" and disclaims beneficial ownership of such securities and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of his indirect pecuniary interest therein, if any.
(4)	The price reported in column 4 is a weighted average price of the aggregate number of shares sold. These shares were sold in multiple transactions at prices ranging from $48.013 to $49.01, inclusive. The Reporting Person undertakes 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 ranges set forth in this footnote.
(5)	The price reported in column 4 is a weighted average price of the aggregate number of shares sold. These shares were sold in multiple transactions at prices ranging from $49.015 to $50.01, inclusive. The Reporting Person undertakes 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 ranges set forth in this footnote.
(6)	The price reported in column 4 is a weighted average price of the aggregate number of shares sold. These shares were sold in multiple transactions at prices ranging from $50.02 to $50.398, inclusive. The Reporting Person undertakes 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 ranges set forth in this footnote.
(7)	The price reported in column 4 is a weighted average price of the aggregate number of shares sold. These shares were sold in multiple transactions at prices ranging from $51.10 to $52.09, inclusive. The Reporting Person undertakes 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 ranges set forth in this footnote.
(8)	The price reported in column 4 is a weighted average price of the aggregate number of shares sold. These shares were sold in multiple transactions at prices ranging from $52.10 to $52.45, inclusive. The Reporting Person undertakes 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 ranges set forth in this footnote.
(9)	On September 16, 2025, DCVC IV distributed, for no consideration, 541,526 shares of Common Stock (the "DCVC IV Shares") to its limited partners and to DCVC IV GP, the general partner of DCVC IV, representing each such partner's pro rata interest in such DCVC IV Shares. DCVC IV GP then distributed, for no consideration, the DCVC IV Shares it received in the distribution by DCVC IV to its members, representing each such member's pro rata interest in such DCVC IV Shares.
(10)	On September 16, 2025, DCVC Opportunity Fund II distributed, for no consideration, 1,331,569 shares of Common Stock (the "DCVC Opportunity Fund II Shares") to its limited partners and to DCVC Opportunity Fund II GP, the general partner of DCVC Opportunity Fund II, representing each such partner's pro rata interest in such DCVC Opportunity Fund II Shares. DCVC Opportunity Fund II GP then distributed, for no consideration, the DCVC Opportunity Fund II Shares it received in the distribution by DCVC Opportunity Fund II to its members, representing each such member's pro rata interest in such DCVC Opportunity Fund II Shares.
(11)	Represents shares received by Three Kingdoms Capital Partners, LP pursuant to pro rata distributions by DCVC IV and DCVC Opportunity Fund II, for no consideration, of shares of Common Stock to their respective partners and such partners' members, as applicable.
(12)	The shares are held of record by Three Kingdoms Capital Partners, LP of which the Reporting Person is an indirect member of the general partner. The Reporting Person disclaims the existence of a "group" and disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purpose.
(13)	Represents shares received by SST Capital Management, LLC pursuant to pro rata distributions by DCVC IV and DCVC Opportunity Fund II, for no consideration, of shares of Common Stock to their respective partners and such partners' members, as applicable.
(14)	The shares are held of record by SST Capital Management, LLC of which the Reporting Person is a beneficial owner. The Reporting Person disclaims the existence of a "group" and disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purpose.

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