Legend Biotech (LEGN) 20-F 2023 FY Annual report (foreign)

EXHIBIT 13.1

Certification by the Principal Executive Officer pursuant to

18 U.S.C. Section 1350, as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of Legend Biotech Corp. (the “Company”) on Form 20-F for the fiscal year ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Ying Huang, Chief Executive Officer of the Company of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 19, 2024

/s/Ying Huang

Name: Ying Huang

Title: Chief Executive Officer  (Principal Executive Officer)