UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

For the month of May 2026

Commission File Number 001-38072

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NexGen Energy Ltd.

(Translation of registrant's name into English)

Suite 3150, 1021 - West Hastings Street

Vancouver, B.C., Canada V6E 0C3

(Address of principal executive offices)

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Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☐                    Form 40-F ☒

EXHIBIT INDEX

Exhibit Description
   
99.1 Unaudited Condensed Interim Consolidated Financial Statements for the Periods Ending March 31, 2026 and 2025
99.2 Management's Discussion and Analysis for the Three Months Ended March 31, 2026
99.3 Form 52-109F2 Certification of Interim Filings - Chief Executive Officer
99.4 Form 52-109F2 Certification of Interim Filings - Chief Financial Officer

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, thereunto duly authorized.

  NEXGEN ENERGY LTD.
  (Registrant)
     
     
Date: May 5, 2026 By: /s/ Benjamin Salter
    Name: Benjamin Salter
    Title:  Chief Financial Officer

ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

EXHIBIT 99.1

EXHIBIT 99.2

EXHIBIT 99.3

EXHIBIT 99.4