Company: GIFLF
Filing Date: 2025-05-06
Form Type: 6-K
Source: 0001104659-25-044928
Chunk: 0

Company: Grifols SA
Filing Date: 2025-05-06
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 May 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>

<div align='center'>2</div>

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

Pursuant to the provisions of article 226 of the
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'>INSIDE INFORMATION</div>

As a continuation of the Inside Information note
filed by Grifols on 31 March 2025, Grifols informs that today the German federal financial supervisory authority, the Bundesanstalt für
Finanzdienstleistungsaufsicht ("BaFin"), approved the publication of the offer document submitted by its fully owned
subsidiary Grifols Biotest Holdings GmbH with the terms and conditions of the public delisting purchase offer launched to all shareholders
of Biotest AG ("Biotest") to acquire all ordinary shares of Biotest which are not already directly or indirectly held
by Grifols Biotest