[Form 4] Rocket Lab Corp Insider Trading Activity

Rhea-AI Filing Summary

Frank Klein, Chief Operations Officer of Rocket Lab Corp (RKLB), reported multiple sales of common stock on September 16-17, 2025. The filings show a series of sell-to-cover transactions tied to RSU vesting and additional sales executed under a Rule 10b5-1 trading plan. Across the listed transactions the reporting person disposed of 49,821 shares at weighted-average prices that ranged roughly from $47.13 to $52.05. Following the reported dispositions, the filing shows the reporting person beneficially owned 1,316,005 shares of common stock. The form states the sales were to satisfy tax-withholding obligations and pursuant to an existing trading plan, and provides weighted-average price ranges for each tranche.

Positive

• Clear disclosure of the reasons for the sales (sell-to-cover for RSU tax withholding and Rule 10b5-1 plan) demonstrating regulatory compliance
• Detailed price ranges and an undertaking to provide per-transaction pricing on request, enhancing transparency

Negative

• Insider sold 49,821 shares across September 16-17, 2025, which represents a material disposition of holdings that investors may notice

Insights

Financial Analyst

TL;DR: Routine insider sales via sell-to-cover and a 10b5-1 plan; disposals total 49,821 shares with weighted-average prices ~ $47.13–$52.05.

The transactions disclosed are sales rather than open-market buys and were largely described as sell-to-cover to satisfy tax withholding on vested RSUs, with additional automatic sales under a Rule 10b5-1 plan. The filing provides weighted-average price ranges for each tranche and reports the reporting person retained 1,316,005 shares after the sales. From a financial-analysis perspective, these are standard liquidity and tax-related insider transactions and do not, by themselves, indicate a change in company fundamentals. The disclosures are complete with price ranges and an offer to provide detailed per-transaction pricing on request.

Corporate Governance Expert

TL;DR: Compliance-focused disclosure; use of a 10b5-1 plan and explicit sell-to-cover explanations reduce governance concerns.

The Form 4 clearly documents the nature of the disposals: sell-to-cover for RSU tax obligations and automatic sales under a Rule 10b5-1 plan adopted December 13, 2024. That transparency aligns with best practices for insider trading disclosures. The filing includes weighted-average price ranges and an explicit statement committing to provide detailed pricing if requested, which supports good governance and regulatory compliance. These factors mitigate typical red flags associated with insider sales.

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^*

Klein Frank

(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)
	Chief Operations Officer

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		8,244(1)	D	$47.785(2)	1,357,582	D
Common Stock	09/16/2025		S		21,244(1)	D	$48.6044(3)	1,336,338	D
Common Stock	09/16/2025		S		9,169(1)	D	$49.4143(4)	1,327,169	D
Common Stock	09/16/2025		S		4,461(1)	D	$50.5206(5)	1,322,708	D
Common Stock	09/16/2025		S		2,417(1)	D	$51.6341(6)	1,320,291	D
Common Stock	09/17/2025		S		1,849(7)	D	$47.3118(8)	1,318,442	D
Common Stock	09/17/2025		S		2,437(7)	D	$48.0281(9)	1,316,005	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 13, 2024.

8. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.6700 to $47.6600, 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 $47.6700 to $48.3500, 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.

	By: /s/ Arjun Kampani, as Attorney-in-Fact For: Frank Klein	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 transactions did Frank Klein report on Form 4 for RKLB?

The reporting person disclosed multiple sales totaling 49,821 shares of Rocket Lab common stock on September 16-17, 2025, including sell-to-cover transactions and sales under a Rule 10b5-1 plan.

Why were the shares sold according to the Form 4?

The filing states the sales were to satisfy tax withholding obligations related to vested restricted stock units and some sales occurred automatically under a Rule 10b5-1 trading plan.

How many Rocket Lab shares does Frank Klein beneficially own after these transactions?

Following the reported disposals, the Form 4 shows the reporting person beneficially owned 1,316,005 shares.

What price ranges were the sales executed at?

The weighted-average price ranges reported across the tranches span approximately $47.13 to $52.05; the form provides specific ranges per tranche and offers to provide per-transaction pricing on request.

Was a trading plan used for any of the sales?

Yes. The filing indicates some sales occurred automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 13, 2024.