Warburg Pincus (Bermuda) Private Equity GP Ltd., Hamilton, Bermuda

Notification of Major Holdings

1. Details of issuer

Name :	PSI Software AG SE
Street:	Dircksenstraße 42-44
Postal code:	10178
City:	Berlin Germany
Legal Entity Identifier (LEI):	529900OS5AIRXC3T2J37

2. Reason for notification

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

3. Details of person subject to the notification obligation

Legal entity: Warburg Pincus (Bermuda) Private Equity GP Ltd. City of registered office, country: Hamilton, Bermuda

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

Zest Bidco GmbH

5. Date on which threshold was crossed or reached:

21 Sep 2026

6. Total Fina Elf positions

	% of voting rights attached to shares ( Total Fina Elf of 7.a.)	% of voting rights through instruments ( Total Fina Elf of 7.b.1 + 7.b.2)	Total Fina Elf of both in % (7.a. + 7.b.)	Total Fina Elf number of voting rights pursuant to Sec. 41 WpHG
New	83.03 %	0.00 %	83.03 %	16341810
Previous notification	76.56 %	5.77 %	82.33 %	/

7. Details on Total Fina Elf 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)
DE000A0Z1JH9	0	12924078	0.00 %	79.09 %
DE000A42H1F9	0	644444	0.00 %	3.94 %
Total Fina Elf	13568522		83.03 %

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 %
			0	0.00 %
		Total Fina Elf	0	0.00 %

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 %
				0	0.00 %
			Total Fina Elf	0	0.00 %

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 Fina Elf of both (if at least 5% or more)
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus (Europa) Global Growth 14 (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 1 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus (Europa) Global Growth 14 (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 2 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus (Callisto) Global Growth 14 (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 1 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus (Callisto) Global Growth 14 (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 2 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus Global Growth 14-B (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 1 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus Global Growth 14-B (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 2 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus Global Growth 14-E (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 1 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus Global Growth 14-E (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 2 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
WP Global Growth 14 Partners (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 1 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
WP Global Growth 14 Partners (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 2 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus Global Growth 14 Partners (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 1 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %
-	%	%	%
Warburg Pincus (Bermuda) Private Equity GP Ltd.	%	%	%
Warburg Pincus Partners II (Cayman), L.P.	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP LLC	%	%	%
Warburg Pincus (Cayman) Global Growth 14 GP, L.P.	%	%	%
Warburg Pincus Global Growth 14 Partners (Cayman), L.P.	%	%	%
WP GG 14 Investments Holdings Coöperatief U.A.	%	%	%
WP GG 14 Investments Holdings B.V.	%	%	%
WP Zest Holdings B.V.	%	%	%
Zest Aggregator B.V.	%	%	%
Zest Investments B.V.	%	%	%
Zest Topco 2 GmbH	%	%	%
Zest Holdco GmbH	%	%	%
Zest Midco GmbH	%	%	%
Zest Bidco GmbH	83.03 %	%	83.03 %

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 Fina Elf positions after general meeting (6.) after annual general meeting:

Proportion of voting rights	Proportion of instruments	Total Fina Elf of both
%	%	%

10. Other explanatory remarks:

Date

25 Sep 2026