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Rocket Lab Corp (RKLB) COO executes 44,390-share sell-to-cover stock sale

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

Rhea-AI Filing Summary

Rocket Lab Corp Chief Operations Officer Frank Klein sold 44,390 shares of common stock in open-market transactions on May 26, 2026. The filing states these sales were part of a Rule 10b5-1 “sell-to-cover” plan to satisfy tax withholding from vested restricted stock units, and he continues to hold more than 1 million shares afterward.

Positive

  • None.

Negative

  • None.

Insights

Routine Rule 10b5-1 sell-to-cover by Rocket Lab’s COO, with large remaining stake.

Chief Operations Officer Frank Klein reported selling 44,390 shares of Rocket Lab Corp common stock on May 26, 2026. All six transactions are coded “S” for open-market sales and described as part of a “sell-to-cover” arrangement tied to vested restricted stock units.

A footnote explains the trades were executed under a pre-established Rule 10b5-1 election to cover tax withholding obligations. Such pre-planned, tax-driven sales generally carry limited informational value about management’s view of the stock, especially when tied to equity compensation vesting.

After these sales, Klein still holds more than 1 million shares directly, according to the reported post-transaction balances. That remaining stake indicates the disposals represent only a small portion of his overall position. Overall, this looks like a routine administrative sale rather than a change in strategic ownership.

Insider Klein Frank
Role Chief Operations Officer
Sold 44,390 shs ($6.33M)
Type Security Shares Price Value
Sale Common Stock 1,172 $139.4122 $163K
Sale Common Stock 3,490 $140.2017 $489K
Sale Common Stock 4,336 $141.4563 $613K
Sale Common Stock 12,915 $142.355 $1.84M
Sale Common Stock 17,288 $143.2433 $2.48M
Sale Common Stock 5,189 $144.1287 $748K
Holdings After Transaction: Common Stock — 1,087,065 shares (Direct, null)
Footnotes (1)
  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. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $138.7700 to $139.7600. 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. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $139.8000 to $140.8000. 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. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $140.8200 to $141.8200. 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. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $141.8300 to $142.8300. 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. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $142.8400 to $143.8300. 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. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $143.8500 to $144.7600. 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 44,390 shares Total common stock sold on May 26, 2026
Transactions count 6 sales Non-derivative open-market sales, code S
Sample sale price $144.1287 per share Weighted-average price for one reported sale tranche
Price range example $138.7700–$139.7600 One disclosed weighted-average price range across multiple trades
Remaining holdings More than 1,000,000 shares Direct ownership after the reported transactions
Rule 10b5-1 regulatory
"pursuant to a "sell-to-cover" transaction pursuant to a Rule 10b5-1 election adopted by the Reporting Person"
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 pursuant to a Rule 10b5-1 election"
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 previously granted to the Reporting Person"
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. These shares were sold in multiple transactions"
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*
Klein Frank
(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 Operations Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/26/2026		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 Stock05/26/2026S1,172(1)D$139.4122(2)1,087,065D
Common Stock05/26/2026S3,490(1)D$140.2017(3)1,083,575D
Common Stock05/26/2026S4,336(1)D$141.4563(4)1,079,239D
Common Stock05/26/2026S12,915(1)D$142.355(5)1,066,324D
Common Stock05/26/2026S17,288(1)D$143.2433(6)1,049,036D
Common Stock05/26/2026S5,189(1)D$144.1287(7)1,043,847D
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 $138.7700 to $139.7600. 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 $139.8000 to $140.8000. 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.
4. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $140.8200 to $141.8200. 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.
5. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $141.8300 to $142.8300. 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.
6. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $142.8400 to $143.8300. 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.
7. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $143.8500 to $144.7600. 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: Frank Klein05/28/2026
** 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

FAQ

What insider transaction did Rocket Lab Corp (RKLB) report for COO Frank Klein?

Frank Klein, Rocket Lab’s Chief Operations Officer, sold 44,390 shares of common stock. The sales occurred on May 26, 2026 and were executed as open-market transactions. They were tied to a sell-to-cover arrangement for tax withholding on vested restricted stock units previously granted to him.

How many Rocket Lab (RKLB) shares did the COO sell and why?

The COO sold 44,390 Rocket Lab common shares in total. A footnote explains the trades were part of a “sell-to-cover” transaction under a Rule 10b5-1 election, intended to satisfy applicable tax withholding obligations from the vesting and settlement of restricted stock units.

At what prices were Frank Klein’s Rocket Lab (RKLB) shares sold?

The reported prices are weighted-average figures for multiple trades. Footnotes state the shares were sold in ranges including $138.7700–$139.7600, $139.8000–$140.8000, $140.8200–$141.8200 and up to $143.8500–$144.7600, with detailed per-trade breakdowns available on request.

Was the Rocket Lab (RKLB) COO’s sale a discretionary trade or under a plan?

The filing states the sales were made under a Rule 10b5-1 election. This pre-arranged trading plan was adopted by the reporting person to automatically sell shares needed to cover tax withholding obligations when restricted stock units vested and settled, indicating a planned, administrative transaction.

How many Rocket Lab (RKLB) shares does the COO still own after these sales?

After the reported sales, the COO continues to hold more than 1 million shares. The Form 4 tables show post-transaction balances above one million shares in each line, indicating that the 44,390 shares sold are a relatively small portion of his total direct ownership.

What does a “sell-to-cover” transaction mean in the Rocket Lab (RKLB) Form 4?

“Sell-to-cover” means shares are sold solely to pay tax withholding on vested equity awards. In this case, the filing explains that the COO’s trades were executed to cover taxes arising from the vesting and settlement of previously granted restricted stock units, not as a standalone investment decision.