Morgan Stanley files Rule 144 notice to sell RKLB shares (RKLB)

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC reported proposed sales of restricted common stock under Rule 144, listing 31,908 shares and 2,021 shares dated 05/22/2026 tied to restricted stock vesting. The filings identify the issuer as the counterparty and show transactions associated with compensation vesting on 05/22/2026.

Insights

Securities Compliance Analyst

Routine Rule 144 notice for vested restricted shares; procedural disclosure only.

The filing lists proposed resale of vested restricted common stock under Rule 144, with specific share counts of 31,908 and 2,021 dated 05/22/2026. This is a notice of intent to sell, not a sale confirmation.

Key items to watch in subsequent filings are actual sale reports or Form 4/Form 5 entries; timing and proceeds are not shown in the provided excerpt.

Key Figures

Proposed resale 1: 31,908 shares Proposed resale 2: 2,021 shares Filer address indicator: 200 W Civic Center Dr., Sandy, UT 84070

3 metrics

Proposed resale 1 31,908 shares Restricted stock vesting on 05/22/2026

Proposed resale 2 2,021 shares Restricted stock vesting on 05/22/2026

Filer address indicator 200 W Civic Center Dr., Sandy, UT 84070 Morgan Stanley Smith Barney LLC Executive Services contact

Key Terms

Restricted Stock Vesting, Rule 144, Form 144

3 terms

Restricted Stock Vesting financial

"Restricted Stock Vesting | Issuer | 31908 | 05/22/2026"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

Rule 144 regulatory

"Filer Information | Securities To Be Sold | Restricted Stock Vesting"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Form 144 regulatory

"CONTENT METADATA: form_type: 144"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	MORGAN STANLEY SMITH BARNEY LLC EXECUTIVE SERVICES 200 W CIVIC CENTER DR. 4TH FLOOR SANDY UT 84070	14622	2084709.94	578867475	05/26/2026	NASDAQ
Common	MORGAN STANLEY SMITH BARNEY LLC EXECUTIVE SERVICES 200 W CIVIC CENTER DR. 4TH FLOOR SANDY UT 84070	927	132165.65	578867475	05/26/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	05/22/2026	Restricted Stock Vesting	Issuer			31908	05/22/2026	Compensation
Common	05/22/2026	Restricted Stock Vesting	Issuer			2021	05/22/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 for RKLB disclose?

The filing discloses proposed resale of restricted common stock under Rule 144. It lists 31,908 shares and 2,021 shares tied to vesting on 05/22/2026, with the issuer identified as the counterparty.

Does this Form 144 mean the shares were sold?

No. Form 144 is a notice of intent to sell under Rule 144, not proof of sale. The filing lists proposed amounts but does not report completed transactions or proceeds.

Who is the filing party in the RKLB Form 144?

The filing party is Morgan Stanley Smith Barney LLC Executive Services located in Sandy, UT, shown as the reporting filer for the proposed sales dated 05/22/2026.

Why are the shares listed as 'Restricted Stock Vesting'?

The shares are identified as resulting from Restricted Stock Vesting, indicating they became vested as compensation on 05/22/2026