K+S Aktiengesellschaft Optiver Holding B.V., Amsterdam, Netherlands

K+S Aktiengesellschaft
K+S Aktiengesellschaft: Release according to Article 40, Section 1 of the WpHG [the German Securities Trading Act] with the objective of Europe-wide distribution
17.09.2026 / 18:05 CET/CEST
Dissemination of a Voting Rights Announcement transmitted by EQS News – a service of EQS Group.
The issuer is solely responsible for the content of this announcement.

Notification of Major Holdings
1. Details of issuer

Name:	K+S Aktiengesellschaft
Street:	Bertha-von-Suttner-Str. 7
Postal code:	34131
City:	Kassel Germany
Legal Entity Identifier (LEI):	529900YURAYD4IJX2J91

2. Reason for notification

	Acquisition/disposal of shares with voting rights
X	Acquisition/disposal of instruments
	Change of breakdown of voting rights
	Other reason:

3. Details of person subject to the notification obligation

Legal entity: Optiver Holding B.V.
City of registered office, country: Amsterdam, Netherlands

4. Names of shareholder(s)
holding directly 3% or more voting rights, if different from 3.

5. Date on which threshold was crossed or reached:

16 Sep 2026

6. Total positions

	% of voting rights attached to shares (total of 7.a.)	% of voting rights through instruments (total of 7.b.1 + 7.b.2)	Total of both in % (7.a. + 7.b.)	Total number of voting rights pursuant to Sec. 41 WpHG
New	0.00 %	10.19 %	10.19 %	179100000
Previous notification	n/a %	n/a %	n/a %	/

7. Details on total positions
a. Voting rights attached to shares (Sec. 33, 34 WpHG)

ISIN	Absolute		In %
	Direct (Sec. 33 WpHG)	Indirect (Sec. 34 WpHG)	Direct (Sec. 33 WpHG)	Indirect (Sec. 34 WpHG)
	0	0	0.00 %	0.00 %
Total	0		0.00 %

b.1. Instruments according to Sec. 38 (1) no. 1 WpHG

Type of instrument	Expiration or maturity date	Exercise or conversion period	Voting rights absolute	Voting rights in %
Call Option	18/09/2026-17/12/2027	Anytime	15197000	8.49 %
		Total	15197000	8.49 %

b.2. Instruments according to Sec. 38 (1) no. 2 WpHG

Type of instrument	Expiration or maturity date	Exercise or conversion period	Cash or physical settlement	Voting rights absolute	Voting rights in %
Put Option	18/09/2026-21/12/2029	Anytime	Physical	1230300	0.69 %
Future Contract	16/10/2026	16/10/2026	Cash	1825500	1.02 %
			Total	3055800	1.71 %

8. Information in relation to the person subject to the notification obligation

	Person subject to the notification obligation is not controlled nor does it control any other undertaking(s) that directly or indirectly hold(s) an interest in the (underlying) issuer (1.).
X	Full chain of controlled undertakings starting with the ultimate controlling natural person or legal entity:

Name	% of voting rights (if at least 3% or more)	% of voting rights through instruments (if at least 5% or more)	Total of both (if at least 5% or more)
-Optiver Holding B.V.	%	%	%
-Optiver B.V.	%	%	%
-Optiver V.O.F.	%	10.19 %	10.19 %

9. In case of proxy voting according to Sec. 34 para. 3 WpHG
(only in case of attribution of voting rights in accordance with Sec. 34 para. 1 sent. 1 No. 6 WpHG)
Date of general meeting:
Holding total positions after general meeting (6.) after annual general meeting:

Proportion of voting rights	Proportion of instruments	Total of both
0 %	0 %	0 %

10. Other explanatory remarks:

Optiver V.O.F. acts as market maker in K+S Aktiengesellschaft Derivative Contracts. The reportable position is the result of MM strategies. The firm therefore relied on the exemption for notifications for positions under 10%.

Date

17 Sep 2026

17.09.2026 CET/CEST The EQS Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases.

Language:	English
Company:	K+S Aktiengesellschaft
	Bertha-von-Suttner-Str. 7
	34131 Kassel
	Germany
Internet:	www.k-plus-s.com
LEI Code:	529900YURAYD4IJX2J91


End of News	EQS News Service

2400928 17.09.2026 CET/CEST