EXHIBIT 31(i).3

CERTIFICATION OF PERIODIC REPORT UNDER SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Hudson La Force, certify that:

1.I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K/A of W. R. Grace & Co.; and

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Date: April 30, 2021

/s/ HUDSON LA FORCE

Hudson La Force

President and Chief Executive Officer

(Principal Executive Officer)