UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

Date of Report: September 24, 2026

Commission File Number: 001-39307

Legend Biotech Corporation

(Exact Name of Registrant as Specified in its Charter)

77 Corporate Drive

Bridgewater, New Jersey 08807

(Address of principal executive office)

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 ☐

On September 24, 2026, Legend Biotech Corporation (the “Company”) held its 2026 Annual General Meeting of Shareholders (the “Meeting”). The voting results are attached hereto as Exhibit 99.1.

This report on Form 6-K, including Exhibit 99.1, shall be deemed to be incorporated by reference in the registration statements of the Company on Form F-3 (Nos. 333-257625 and 333-278050) and Form S-8 (Nos. 333-239478 and 333-283217), to the extent not superseded by documents or reports subsequently filed.

EXHIBITS

Exhibit 99.1 — Voting Results of Annual General Meeting

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.