Form 8-K

8-K — Rocket Lab Corp

Accession: 0001753926-26-000799

Filed: 2026-05-08

Period: 2026-05-08

CIK: 0001819994

SIC: 3760 (GUIDED MISSILES & SPACE VEHICLES & PARTS)

Item: Other Events

Item: Financial Statements and Exhibits

Documents

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EX-5.1 — EXHIBIT 5.1 (g085715_ex5-1.htm)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT

REPORT

Pursuant

to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event

reported): May 8, 2026

ROCKET LAB CORPORATION

(Exact name of Registrant as Specified

in Its Charter)

Delaware

001-39560

39-2182599

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(IRS Employer

Identification No.)

3881 McGowen Street

Long Beach, California

90808

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number,

Including Area Code: 714 465-5737

Not Applicable

(Former Name or Former Address, if Changed

Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended

to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section

12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange on which registered

Common Stock, par value $0.0001 per share

RKLB

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging

growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the

Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the

registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards

provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events.

On May 8, 2026, Rocket Lab Corporation (the “Company”)

filed with the Securities and Exchange Commission (the “SEC”) a prospectus supplement to the prospectus included in

the Company’s registration statement on Form S-3ASR filed with the SEC on March 11, 2025 (File No. 333-285707), as amended

by the Post-Effective Amendment No. 1 filed with the SEC on May 27, 2025 (the “Registration Statement”), covering the

resale by certain selling stockholders of up to 2,277,002 shares of the Company’s Common Stock in the aggregate issued on

April 14, 2026 in a private placement in connection with the previously announced acquisition of Mynaric AG, pursuant to a Stock

Purchase Agreement, dated as of September 25, 2025, by and among the Company, Rocket Lab USA, Inc., OC III LVS LIII LP, CO Finance

II LVS I LLC, Rocket Lab Germany GmbH via joinder dated April 13, 2026 and OC IV LVS VI LP via joinder dated April 13, 2026 (the

“Stock Purchase Agreement”). The prospectus supplement was filed in accordance with the Stock Purchase Agreement. A

copy of the legal opinion of Goodwin Procter LLP relating to the shares covered by the prospectus supplement is filed herewith

as Exhibit 5.1, and is filed with reference to, and is hereby incorporated by reference in, the Registration Statement.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit

No.

Description

5.1

Opinion of Goodwin Procter LLP.

23.1

Consent of Goodwin Procter LLP (included in Exhibit 5.1).

104

Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act

of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

ROCKET LAB CORPORATION

Date:

May 8, 2026

By:

/s/ Adam Spice

Adam Spice

Chief Financial Officer

EX-5.1 — EXHIBIT 5.1

EX-5.1

Filename: g085715_ex5-1.htm · Sequence: 2

Goodwin

Procter LLP

601 Marshall St.

Redwood City, CA 94063

goodwinlaw.com

+1 650 752 3100

May 8, 2026

Rocket Lab Corporation

3881 McGowen Street

Long Beach, California 90808

Re: Securities

Registered under Registration Statement on Form S-3

We have acted as counsel to you in connection with the Registration

Statement on Form S-3ASR (File No. 333-285707) filed on March 11, 2025 by Rocket Lab USA, Inc. and Post-Effective Amendment

No. 1 to such Registration Statement on Form S-3ASR filed on May 27, 2025 (as amended or supplemented, the “Registration

Statement”) by Rocket Lab Corporation, a Delaware corporation (the “Company”) with the Securities and Exchange

Commission pursuant to the Securities Act of 1933, as amended (the “Securities Act”), which became effective upon its

filing. You have asked us to deliver this opinion in connection with the registration of the offering of up to 2,277,002 shares

(the “Shares”) of common stock of the Company, par value $0.0001 per share, pursuant to the Registration Statement,

with all of such Shares to be sold by the selling stockholders listed under “Selling Stockholders” in the prospectus

supplement to the Registration Statement filed by the Company pursuant to Rule 424(b)(7) of the Securities Act on May 8, 2026.

We have reviewed such documents and made such examination of

law as we have deemed appropriate to give the opinion set forth below. We have relied, without independent verification, on certificates

of public officials and, as to matters of fact material to the opinion set forth below, on certificates of officers of the Company.

The opinion set forth below is limited to the Delaware General

Corporation Law.

Based on the foregoing, we are of the opinion that the Shares

have been duly authorized and validly issued and are fully paid and non-assessable.

This opinion letter and the opinion it contains shall be interpreted

in accordance with the Core Opinion Principles as published in 74 Business Lawyer 815 (Summer 2019).

Rocket Lab Corporation

May 8, 2026

Page 2

We hereby consent to the inclusion of this opinion as Exhibit 5.1

to the Registration Statement and to the references to our firm under the caption “Legal Matters” in the Registration

Statement. In giving our consent, we do not admit that we are in the category of persons whose consent is required under Section 7

of the Securities Act or the rules and regulations thereunder.

Very truly yours,

/s/ Goodwin Procter LLP

GOODWIN PROCTER LLP

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