6-K

UNITED STATESSECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TORULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of January 2026

Commission File No. 001-35193

Grifols, S.A.

(Translation of registrant’s name into English)

Avinguda de la Generalitat, 152-158

Parc de Negocis Can Sant Joan

Sant Cugat del Valles 08174

Barcelona, Spain

(Address of registrant’s principal executive office)

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

Form 20-F x                        Form 40-F ¨

Grifols, S.A.

TABLE OF CONTENTS

Pursuant to the provisions of article 227 of the Consolidated Text of the Securities Market Act, approved by the Legislative Royal Decree 4/2015, of 23 October, Grifols, S.A. ("Grifols" or the "Company") hereby informs about the following

OTHER RELEVANT INFORMATION

The Company's Board of Directors informs that it has resolved to unanimously approve with effects as from 1 January 2026 to appoint, following the favourable report from the Appointments and Remuneration Committee, (i) Ms. Laura de la Cruz Galán as the new Secretary non-member of the Board of Directors, replacing Mrs. Núria Martín Barnés, and (ii) Mrs. Núria Martín Barnés as the new Vice-secretary non-member of the Board of Directors, replacing Ms. Laura de la Cruz Galán.

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, thereto duly authorized.

Date: January 8, 2026