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  4. [Form 4] Rocket Lab Corp Insider Trading Activity

Rocket Lab (RKLB) CFO sells 9,677 shares to cover taxes

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Rocket Lab Corp (RKLB) disclosed that Chief Financial Officer Adam C. Spice sold a total of 9,677 shares of common stock on August 24, 2026 in a series of open-market transactions. According to the disclosure, all sales were part of a sell-to-cover arrangement under a Rule 10b5-1 trading plan to satisfy tax withholding obligations arising from the vesting and settlement of previously granted restricted stock units. The reported weighted-average sale prices ranged from about $69.00 to $71.17 per share. Following these transactions, an indirect holding of 250,000 shares is reported as held by a trust.

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Insider Spice Adam C.
Role Chief Financial Officer
Sold 9,677 shs ($674K)
Type Security Shares Price Value
Sale Common Stock F1, F2 8,952 $69.5345 $622K
Sale Common Stock F1, F3 290 $70.2023 $20K
Sale Common Stock F1 435 $71.17 $31K
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 1,155,967 shares (Direct); Common Stock — 250,000 shares (Indirect, by Trust)
Footnotes (3)
  1. F1. Represents the sale of shares pursuant to a "sell-to-cover" transaction pursuant to a Rule 10b5-1 election adopted by the Reporting Person 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. F2. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $69.0000 to $69.9900. The Reporting Person undertakes to provide the Registrant, any securityholder of the Registrant, 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. F3. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $70.0000 to $70.6400. The Reporting Person undertakes to provide the Registrant, any securityholder of the Registrant, 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.
Shares sold (total) 9,677 shares Common Stock sales by CFO Adam C. Spice on 2026-08-24
Shares sold at $69.5345 8,952 shares at $69.5345 per share Open-market sale, weighted-average price, 2026-08-24
Shares sold at $70.2023 290 shares at $70.2023 per share Open-market sale, weighted-average price, 2026-08-24
Shares sold at $71.1700 435 shares at $71.1700 per share Open-market sale, 2026-08-24
Weighted-average price range (F2) $69.0000–$69.9900 Price range for transactions referenced by footnote F2
Weighted-average price range (F3) $70.0000–$70.6400 Price range for transactions referenced by footnote F3
Indirect holdings by Trust 250,000 shares Common Stock held indirectly by Trust following transactions
Rule 10b5-1 regulatory
"pursuant to a "sell-to-cover" transaction pursuant to a Rule 10b5-1 election"
Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.
sell-to-cover financial
"Represents the sale of shares pursuant to a "sell-to-cover" transaction"
Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.
restricted stock units financial
"in connection with the vesting and settlement of restricted stock units"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
weighted-average price financial
"The price reported in Column 4 is a weighted-average price."
Weighted-average price is the average of multiple prices where each price is counted according to its size or importance—larger trades carry more weight than smaller ones, like averaging course grades by credit hours. It matters to investors because it gives a more realistic picture of the true price paid or received, helping assess trade execution, compare performance, calculate cost basis, and value positions more accurately than a simple average.

FAQ

What did RKLB CFO Adam C. Spice report in this Form 4?
Adam C. Spice, Chief Financial Officer of Rocket Lab Corp (RKLB), reported selling a total of 9,677 shares of common stock on August 24, 2026 in open-market transactions tied to tax withholding on vesting restricted stock units.

How many RKLB shares did the CFO sell and at what prices?
The CFO sold 9,677 shares of Rocket Lab common stock. Weighted-average prices were $69.5345 for 8,952 shares, $70.2023 for 290 shares, and $71.1700 for 435 shares, with transaction price ranges from $69.0000–$69.9900 and $70.0000–$70.6400 where noted.

Was the RKLB insider trading done under a Rule 10b5-1 plan?
Yes. The filing states the sales were made pursuant to a Rule 10b5-1 election adopted by the reporting person, used in a sell-to-cover transaction to satisfy tax withholding obligations on vesting restricted stock units.

Why were these RKLB shares sold by the CFO?
The shares were sold as part of a sell-to-cover transaction to satisfy applicable tax withholding obligations in connection with the vesting and settlement of restricted stock units previously granted to the reporting person.

What ongoing RKLB share holdings are reported for the CFO?
The Form 4 reports an indirect holding of 250,000 shares of Rocket Lab common stock held by Trust following the reported transactions.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Spice Adam C.
(Last)(First)(Middle)
3881 MCGOWEN STREET
(Street)
LONG BEACH CALIFORNIA 90808
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
Rocket Lab Corp [ RKLB ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/24/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
CodeVAmount(A) or (D)Price
Common Stock08/24/2026S8,952(1)D$69.5345(2)1,156,692D
Common Stock08/24/2026S290(1)D$70.2023(3)1,156,402D
Common Stock08/24/2026S435(1)D$71.171,155,967D
Common Stock250,000Iby Trust
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents the sale of shares pursuant to a "sell-to-cover" transaction pursuant to a Rule 10b5-1 election adopted by the Reporting Person 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 $69.0000 to $69.9900. The Reporting Person undertakes to provide the Registrant, any securityholder of the Registrant, 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 $70.0000 to $70.6400. The Reporting Person undertakes to provide the Registrant, any securityholder of the Registrant, 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: Adam Spice08/26/2026
** Signature of Reporting PersonDate
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.
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 Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR