[Unofficial translation:] Publication of the total number of voting rights pursuant to Section 41 of the German Securities Trading Act (WpHG)

This is an unofficial translation of the adhoc-announcement. Please download the official adhoc-announcement here (only available in German).

1. Issuer
Rostra AG, Fritz-Vomfelde-Straße 34, 40547 Düsseldorf, Germany

2. Type of capital measure or other measure
Other (capital) measure (Section 41 (1) WpHG)
Status as of / Date of effectiveness: December 19, 2025

3. New total number of voting rights: 4,411,045
of which multiple voting rights: n/a