Company: GIFLF
Filing Date: 2025-07-29
Form Type: 6-K
Source: 0001104659-25-071400
Chunk: 0

Company: Grifols SA
Filing Date: 2025-07-29
Form: 6-K
Chunk 0
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<div align='center'>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
UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of July 2025

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)</div>

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 ¨ |

<div align='center'>Grifols, S.A.

TABLE OF CONTENTS</div>

| Grifols, S.A.                      
 Avinguda de la Generalitat 152-158 
 08174 Sant Cugat del Vallès        
 Barcelona - SPAIN                  
 Tel. [34] 935 710 500              
 Fax [34] 935 710 267               
 www.grifols.com                    |

Pursuant to the provisions of Article 227 of Law
6/2023 of March 17, on Securities Markets and Investment Services, Grifols, S.A. ("Grifols" or the "Company")
hereby informs about the following

<div align='center'>OTHER RELEVANT INFORMATION</div>

The Board of Directors of Grifols, in its meeting
held on 28 July 2025 resolved, among other resolutions, to amend the Regulations of the Internal Functioning of the Board of Directors
of Grifols in order to revise the wording related to the Sustainability Committee, which has been renamed as the "Sustainability,
Communication and Reputation Committee", as well as to establish as an authority of such committee the supervision of the corporate
reputation of the Company and the companies within the group.

The new amended text of the Regulations of the
Internal Functioning of the Board of Directors of Grifols will be communicated to the National Securities Market Commission (Comisión Nacional del Mercado de Valores) through the corresponding procedure authorized for this purpose and is available on Grifols'
cor