Company: GIFLF
Filing Date: 2025-06-12
Form Type: 6-K
Source: 0001104659-25-058641
Chunk: 0

Company: Grifols SA
Filing Date: 2025-06-12
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 June 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>

<div align='center'>2</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., Barcelona, Spain ("Grifols"
or the "Company") hereby informs about the following

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

As a continuation of the Privileged
Information notes filed by Grifols on March 31, 2025 and May 6, 2025 of this year in relation to the public delisting purchase offer launched
by its subsidiary Grifols Biotest Holdings GmbH, Frankfurt am Main, Germany to all shareholders of Biotest Aktiengesellschaft, Dreieich,
Germany ("Biotest") to acquire all ordinary shares of Biotest at a price of €43.00 per ordinary share and all non-voting
preferred shares of Biotest at a price of €30.00 per non-voting preferred share (the "Delisting Offer"), in accordance
with the Offer Document the acceptance period ended on June