Company: GIFLF
Filing Date: 2025-12-16
Form Type: 6-K
Source: 0001104659-25-121424
Chunk: 0

Company: Grifols SA
Filing Date: 2025-12-16
Form: 6-K
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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 December 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.

<div align='center'>Form 20-F x Form 40-F ¨

Grifols, S.A.

TABLE OF CONTENTS</div>

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| 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>

Grifols informs that on December 11, 2025,
the European Medicines Agency (EMA) has issued the Certificate of Compliance with Community legislation for the plasma supplied by Grifols
Egypt for Plasma Derivatives (GEPD), the joint venture established in 2020 jointly between Grifols and Egypt’s National Service Projects
Organization.

This certification has been granted after the
quality inspection to the plasma centers owned by GEPD and after the review by the EMA that all procedures, selection of donors, plasma
obtention methods, quality controls, and storage (among others) comply with the quality and security standards required by European legislation.

This certification will allow not only
to manufacture plasma products by GEPD but also to commercialize them throughout