Bilfinger SE: Release according to Article 40, Section 1 of the WpHG [the German Securities Trading Act] with the objective of Europe-wide distribution

Notification of Major Holdings

1. Details of issuer

Name:	Bilfinger SE
Street:	Oskar-Meixner-Straße 1
Postal code:	68163
City:	Mannheim Germany
Legal Entity Identifier (LEI):	529900H0HULEN2BZ4604

2. Reason for notification

	Acquisition/disposal of shares with voting rights
	Acquisition/disposal of instruments
	Change of breakdown of voting rights
X	Other reason: voluntary group notification with triggered threshold on subsidiary level

3. Details of person subject to the notification obligation

Legal entity: Wellington Management Group LLP City of registered office, country: Boston, United States of America (USA)

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:

19 Aug 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	4.66 %	0.02 %	4.68 %	37606372
Previous notification	4.48 %	0.02 %	4.51 %	/

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)
DE0005909006	0	1752629	0.00 %	4.66 %
Total	1752629		4.66 %

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	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 %
Equity Swap	05/05/2028	05/05/2028	Cash settlement	6439	0.02 %
Equity Swap	20/05/2033	20/05/2033	Cash settlement	1647	0 %
Equity Swap	15/05/2033	15/05/2033	Cash settlement	889	0 %
			Total	8975	0.02 %

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)
Wellington Management Group LLP	%	%	%
Wellington Group Holdings LLP	%	%	%
Wellington Investment Advisors Holdings LLP	%	%	%
Wellington Management Company LLP	3.71 %	%	%
Wellington Global Multi-Strategy Fund	%	%	%
-	%	%	%
Wellington Management Group LLP	%	%	%
Wellington Group Holdings LLP	%	%	%
Wellington Investment Advisors Holdings LLP	%	%	%
Wellington Management Global Holdings, Ltd.	%	%	%
Wellington Management International Ltd.	3.11 %	%	%
-	%	%	%
Wellington Management Group LLP	%	%	%
Wellington Group Holdings LLP	%	%	%
Wellington Management Funds Holdings LLP	%	%	%
Wellington Alternative Investments LLC	%	%	%
Wellington Global Multi-Strategy Master Fund (Cayman) L.P.	%	%	%
-	%	%	%
Wellington Management Group LLP	%	%	%
Wellington Group Holdings LLP	%	%	%
Wellington Management Funds Holdings LLP	%	%	%
Wellington Alternative Investments LLC	%	%	%
Wellington Global Multi-Strategy Fund, L.P.	%	%	%
-	%	%	%
Wellington Management Group LLP	%	%	%
Wellington Group Holdings LLP	%	%	%
Wellington Management Funds Holdings LLP	%	%	%
Wellington Alternative Investments LLC	%	%	%
Wellington Strategic European Equity Long/Short Master Fund (Cayman) L.P.	%	%	%
-	%	%	%
Wellington Management Group LLP	%	%	%
Wellington Group Holdings LLP	%	%	%
Wellington Management Funds Holdings LLP	%	%	%
Wellington Alternative Investments LLC	%	%	%
Wellington Strategic European Equity Long/Short Fund (Cayman) L.P.	%	%	%
-	%	%	%
Wellington Management Group LLP	%	%	%
Wellington Group Holdings LLP	%	%	%
Wellington Management Funds Holdings LLP	%	%	%
Wellington Alternative Investments LLC	%	%	%
Wellington Strategic European Equity Long/Short Fund, L.P.	%	%	%

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
%	%	%

10. Other explanatory remarks:

Date

24 Aug 2026