[Form 4] Rocket Lab Corp Insider Trading Activity

Rhea-AI Filing Summary

Rocket Lab Corp (RKLB) reporting person Arjun Kampani, SVP General Counsel, disclosed multiple sales of common stock on September 16-17, 2025. The Form 4 shows a series of dispositions totaling 40,601 shares sold, executed as both "sell-to-cover" transactions to satisfy tax withholding on vested restricted stock units and automated sales under a Rule 10b5-1 trading plan adopted December 12, 2024. Reported weighted-average prices for the sales ranged roughly from $46.53 to $52.05, with specific weighted-average prices between $47.18 and $51.63 shown for the reported lots. After these transactions, the filing shows the reporting person beneficially owned 489,629 shares.

Positive

• Timely and detailed disclosure of insider sales on Form 4, including weighted-average price ranges and explanatory footnotes.
• Use of a Rule 10b5-1 trading plan for some sales, indicating pre-scheduled automated transactions rather than opportunistic trades.
• Sell-to-cover transactions were identified as tax withholding on vested RSUs, a routine compensation-related disposition.

Negative

• Total of 40,601 shares sold on September 16-17, 2025, which reduced the reporting person's beneficial ownership to 489,629 shares.
• Sales executed at prices with weighted-average ranges between approximately $46.53 and $52.05, which may be perceived negatively by some investors despite stated purposes.

Insights

Financial Analyst

TL;DR: Insider sales of 40,601 RKLB shares occurred via sell-to-cover and a pre-established 10b5-1 plan; impact appears routine rather than strategic.

The reported transactions consist of multiple small-to-midsize dispositions on September 16-17, 2025, aggregating 40,601 shares at weighted-average prices reported across several ranges between approximately $46.53 and $52.05. Many sales are explicitly identified as "sell-to-cover" for tax withholding related to RSU vesting, which is a common, non-strategic form of insider selling. Additional sales under a Rule 10b5-1 plan indicate pre-scheduled activity rather than opportunistic trading. The remaining beneficial ownership of 489,629 shares provides context for scale but the filing does not state total outstanding company shares, so percent ownership cannot be calculated from this document alone.

Compliance / Governance Expert

TL;DR: Form 4 discloses compliant, timely reporting of sales including Rule 10b5-1 plan activity and tax-related sell-to-cover dispositions.

The filing includes clear explanatory footnotes: several lots are "sell-to-cover" to satisfy tax withholding on settled RSUs, and two lots were executed automatically under a 10b5-1 trading plan adopted December 12, 2024. These disclosures align with standard Section 16 reporting expectations. Weighted-average price ranges are provided and the reporting person offers to supply per-transaction breakdowns upon request, which supports transparency. No derivative transactions or additional indicia of coordinated or undisclosed activity are reported.

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
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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^*

Kampani Arjun

(Last) (First) (Middle)

3881 MCGOWEN STREET

(Street)

LONG BEACH CA 90808

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Rocket Lab Corp [ RKLB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP General Counsel &

3. Date of Earliest Transaction (Month/Day/Year)
09/16/2025

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	09/16/2025		S		5,646(1)	D	$47.785(2)	524,584	D
Common Stock	09/16/2025		S		14,549(1)	D	$48.6044(3)	510,035	D
Common Stock	09/16/2025		S		6,279(1)	D	$49.4143(4)	503,756	D
Common Stock	09/16/2025		S		3,055(1)	D	$50.5206(5)	500,701	D
Common Stock	09/16/2025		S		1,656(1)	D	$51.6341(6)	499,045	D
Common Stock	09/17/2025		S		3,000(7)	D	$47.1793(8)	496,045	D
Common Stock	09/17/2025		S		6,416(7)	D	$47.9506(9)	489,629	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. Represents the sale of shares pursuant to a "sell-to-cover" transaction in order to satisfy applicable tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the reporting person.

2. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $47.1300 to $48.1200, 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 range set forth in this footnote.

3. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $48.1300 to $49.1200, 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 range set forth in this footnote.

4. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $49.1300 to $50.1200, 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 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 $50.1300 to $51.1100, 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 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 $51.1300 to $52.0500, 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 range set forth in this footnote.

7. Represents the sale of shares which occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2024.

8. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.5300 to $47.4600, 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 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 $47.6000 to $48.4400, 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 range set forth in this footnote.

	/s/ Arjun Kampani	09/18/2025
	** 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.
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FAQ

What did Arjun Kampani (RKLB) report on Form 4?

The Form 4 reports multiple sales of Rocket Lab common stock on September 16-17, 2025, totaling 40,601 shares sold, with weighted-average prices reported across specified ranges.

Why were some shares sold according to the Form 4?

Footnotes state that several lots were sell-to-cover transactions to satisfy tax withholding on vested RSUs, and others occurred automatically under a Rule 10b5-1 plan adopted December 12, 2024.

How many shares does the reporting person own after the sales?

After the reported transactions the filing shows the reporting person beneficially owns 489,629 shares.

What price ranges were the shares sold at?

Reported weighted-average prices span roughly $46.53 to $52.05, with specific weighted-average prices listed for each lot between about $47.18 and $51.63.

Were any derivative transactions reported?

No. Table II shows no derivative securities acquired or disposed of; only common stock disposals are reported in Table I.