Sec Form 4 Filing - Beck Peter @ Rocket Lab USA, Inc. - 2024-12-03

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

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Beck Peter 2. Issuer Name and Ticker or Trading Symbol Rocket Lab USA, Inc. [ RKLB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 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 (MM/DD/YY) 12/03/2024 (Street) LONG BEACH, CA90808 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 12/03/2024 A 631,498 ( 1 ) A $ 0 631,498 D Common Stock 12/03/2024 A 157,875 ( 2 ) A $ 0 789,373 D Common Stock 50,951,250 I By Trust ( 3 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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, CA90808 X X President, CEO and Chairman Beck Kerryn C/O ROCKET LAB USA, INC. 3881 MCGOWEN STREET LONG BEACH, CA90808 X Butler Warren C/O ROCKET LAB USA, INC. 3881 MCGOWEN STREET LONG BEACH, CA90808 X Equatorial Trust C/O ROCKET LAB USA, INC. 3881 MCGOWEN STREET LONG BEACH, CA90808 X Peek Street Equatorial Trustee Ltd C/O ROCKET LAB USA, INC. 3881 MCGOWEN STREET LONG BEACH, CA90808 X Signatures /s/ Adam Spice, as Attorney-in-Fact for Peter Beck 12/05/2024 Signature of Reporting Person Date /s/ Adam Spice, as Attorney-in-Fact for Kerryn Beck 12/05/2024 Signature of Reporting Person Date /s/ Adam Spice, as Attorney-in-Fact for Warren Butler 12/05/2024 Signature of Reporting Person Date /s/ Adam Spice, as Attorney-in-Fact for Equatorial Trust 12/05/2024 Signature of Reporting Person Date /s/ Adam Spice, as Attorney-in-Fact for Peek Street Equatorial Trustee Limited 12/05/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents restricted stock units ("RSUs") granted to Peter Beck under the Rocket Lab USA, Inc. 2021 Stock Option and Incentive Plan (the "2021 Plan"). Such RSUs will vest as follows: 5/16 of the RSUs will vest on March 1, 2025 and 1/16 of the RSUs will vest on each May 22, August 22, November 22 and March 1 thereafter, in each case subject to Peter Beck's continuous service relationship through each applicable vesting date. The RSUs were granted on December 3, 2024. ( 2 )Represents RSUs granted to Peter Beck under the 2021 Plan. Such RSUs will vest in full on March 1, 2025, subject to Peter Beck's continuous service relationship through such vesting date. The RSUs were granted on December 3, 2024. ( 3 )These shares are held directly by the Equatorial Trust (the "Trust"), a family trust settled by Peter Beck and Kerryn Beck. 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.

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).

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