3U Holding AG

Interim / Quarterly Report • Nov 11, 2025

Group results at a glance

3U Group		9M 2025	9M 2024	+/– in %
Group revenue	EUR million	41.3	42.1	–1.9
ITC		10.2	14.6	–30.0
Renewable Energies		3.6	3.7	–0.5
HVAC		28.2	24.5	15.2
Group-EBITDA	EUR million	–1.9	3.5
ITC		2.4	3.3	–27.9
Renewable Energies		2.4	2.3	6.4
HVAC		–4.0	–0.5
EBITDA margin	%	–4.5	8.2
ITC		23.5	22.8
Renewable Energies		67.2	62.9
HVAC		–14.3	–2.1
Net income for the period	EUR million	–5.7	0.8
3U Group		30/09/2025	31/12/2024	+/– in %
Equity ratio	%	56.4	69.2
Cash and cash equivalents	EUR million	19.9	42.6	–53.3
Working Capital	EUR million	24.9	49.2	–49.5
Net debt	EUR million	25.5	–16.4
Free Cashflow	EUR million	–40.8	–18.6*
Employees	FTE	210	168	25.0
ITC		59	69	–14.5
Renewable Energies		7	7	0.0
HVAC		114	64	78.1
Holding		30	28	7.1

^*as of 30/09/2024

Table of contents 1

Highlights

Highlights 2025

Interim Group Management Report

• Result of operations, financial position and net assets
• Result of the Group's operations
• Segment performance
• Financial position and net assets
• Significant events after the end of the reporting period
• Outlook

Interim Consolidated Financial Statements

• Statement of financial position
• Consolidated statement of income
• Segment information

Additional Information

• Financial calendar
• Contact
• Imprint
• Disclaimer
• 3U Group

2 Highlights 2025

February 2025

3U HOLDING AG relocates to new building in Marburg

After just over a year of construction, the state-of-the-art office building is ready for occupation. Built to cutting-edge energy and environmental standards, the new building at 3U HOLDING AG's headquarters in Marburg is testimony to the company's aspiration to achieve carbon neutrality. The new administrative center boasts a total floor area of around 2,000 square meters, along with 36 modern offices over three floors to accommodate up to 80 staff members. The site area covers approximately 3,200 square meters. A rooftop solar plant can generate up to 36.4MWh of green energy a year. A total of ten charging points for electric vehicles and 34 bike stands with ten charging sockets are available.

3U acquires specialist for water-based floor heating systems

Effective 1 January 2025, 3U HOLDING AG acquired EMPUR Produktionsgesellschaft mbH, which has enabled it to extend its vertical integration and expand the range of products and services associated with the core product of surface heating systems. EMPUR ranks as one of Germany's largest manufacturers in the business of water-based surface heating. In addition, further assets of GKS GmbH & Co. KG und EM-Plan GmbH were taken over. Operating out of Buchholz-Mendt in the District of Neuwied, Rhineland Palatinate, EMPUR is a system supplier for floor heating for new buildings and refurbishment projects, along with industrial applications. The takeover includes 65 employees.

March 2025

Yet another award for www.selfio.de

The Computer BILD magazine and the market research portal Statista have once again admitted www.selfio.de, the Group's leading online specialist for home technology products, to the league of Germany's best online shops. The 3U subsidiary's e-commerce shop therefore takes its place among the leading Top Shops 2025 in the "Home Technology" segment. "Technical Quality" and "User Friendliness" received "very high" ratings from the jury. The award specifically acknowledges the comprehensive range of HVAC products, components for floor heating systems and PV technology. The extensive offer, combined with reliable customer service and expert advice, is the common denominator permeating the e-retailer's presence in the market.

June 2025

• 3U acquires strategic production and logistics location

3U HOLDING AG has purchased a commercial property located in Industriepark Nord in Buchholz-Mendt for EUR 2.5 million, financed by equity capital and a loan. The property consists of three buildings with production and warehouse areas covering 2,300 square metres, along with office space and communal facilities. This measure enables 3U to secure the locations of subsidiaries EMPUR and Calefa in the HVAC segment for the long term. The property facilitates the ongoing production and expansion of floor heating systems and harbours potential for generating additional revenue from leasing. The acquisition emphasises 3U HOLDING AG's strategic alignment to creating sustainable value added and ramping up its capacities.

July 2025

• The holding buys more Bitcoin

3U HOLDING AG has added another 158 Bitcoins to its Bitcoin portfolio, thereby raising the investment volume to more than EUR 26.6 million. Acquiring more Bitcoin is part of a short-term treasury strategy aimed at investing surplus liquidity and at reinforcing the company's financial position. 3U's core business in the areas of ITC, Renewable Energies, HVAC and real estate remain unaffected. 3U HOLDING AG ranks among the first European companies to use cryptocurrency for strategic ends. At the time when the report was being drawn up the Group held 358 Bitcoin in total.

4 Result of operations, financial position and net assets

Result of the Group's operations

After a positive start to the financial year 2025, growth slowed in the second and third quarter. From a cumulative standpoint, consolidated revenue in the first nine months of 2025 was slightly lower year on year, down 1.9% to EUR 41.3 million (9M 2024: EUR 42.1 million). While earnings in the ITC segment declined in line with expectations, the Group recorded stable development in the Renewable Energies segment. Despite the conversion activities at the Langendorf location, the Renewable Energies segment achieved revenue at the year-earlier level. The HVAC's e-commerce operations reported growth through acquiring EMPUR in the period under review.

The ITC segment generated a share in sales revenue (net of consolidation effects) of 24.3% (9M 2024: 34.1%), while the Renewable Energies segment delivered 8.6% (9M 2024: 8.6%) and the HVAC segment 67.1% (9M 2024: 57.4%).

Share of the segments in consolidated revenue in %

Other operating income in the Group dropped by 26.8% to EUR 2.0 million (9M 2024: EUR 2.7 million). The position is principally attributable to income from leasing office space in Würzburg and to compensation for damages. In the previous year, this figure was still mainly impacted by the compensation paid out as a result of technical defects in the Renewable Energies segment and the appreciation in value realised from selling the company's gold holdings.

The cost of materials shed 1.9%, dropping to the slightly lower level of EUR 27.7 million at the end of the first nine months compared with EUR 28.2 million in the previous year's period. In absolute terms, the ITC segment which came in at EUR 3.3 million recorded the greatest decline in relation to the revenue trend. By contrast, the cost of materials in the HVAC segment rose by EUR 3.0 million to EUR 22.8 million. At 67.0%, the Group's cost of materials ratio (cost of materials as a percentage of sales) remained at the year-earlier level (9M 2024: 67.0%) in the first three quarters of 2025.

Due principally to the lower level of other operating income, gross profit posted EUR 16.5 million, down 6.7% in the first nine months of 2025 compared with the year-earlier period (9M 2024: EUR 17.6 million). The gross profit margin decreased slightly, from 41.9% to 39.8%.

The Group's personnel expenses grew tangibly in the reporting period, rising 29.1% to EUR 10.4 million year on year (9M 2024: EUR 8.0 million). This increase is due above all to acquisitions, namely the takeover of the EMPUR companies. The personnel expenses ratio (personnel expenses as a percentage of revenue) stood at 25.1% in the reporting period, up from the year-earlier figure of 19.1%.

The share of other operating expenses in revenue rose substantially, from 14.6% to 17.6%, due also to consultancy costs in connection with acquisitions completed or planned and restructuring measures.

As expected, the marked increase in personnel expenses and higher other operating expenses resulted in a marked decline in EBITDA in the period under review. The Group's earnings before interest, taxes, depreciation and amortisation came in at EUR –1.9 million in the reporting period, down from EUR 3.5 million in the first nine months of 2024. This result corresponds to an EBITDA margin of currently –4.5% (9M 2024: 8.2%).

Depreciation and amortisation amounted to EUR 3.0 million over the period from January to September 2025 (9M 2024: EUR 3.0 million). In the same period, 3U recorded a financial result of EUR –0.4 million (9M 2024: EUR 0.5 million), along with tax expenses of EUR 0.3 million (9M 2024: EUR 0.2 million).

The proportion of the consolidated result attributable to shareholders of the parent company amounted to EUR –5.7 million (9M 2024: EUR 0.8 million). Earnings per share stood at EUR –0.17 (basic and diluted), following on from EUR 0.02 the year before.

Development of the Group in EUR million

As of 30 September 2025, the 3U Group employed a workforce of 234 persons in total (including Management Board members, temporary employees and part-time staff; 31 December 2024: 187). Converted into full-time equivalents, the Group recorded 210 FTE at the end of the quarter compared with 168 FTE as per 31 December 2024. The significant growth as of the current reporting date is almost exclusively due to taking over the EMPUR companies in the first quarter of 2025.

Employees

Segment performance

ITC (Information and Telecommunications Technology) segment

As expected, the ITC segment did not achieve the year-earlier figures in the first nine months of 2025. Earnings in the reporting period which came in at EUR 10.2 million fell 30.0% short of the year-earlier figure (9M 2024: EUR 14.6 million). Along with the virtual discontinuation of Voice Retail, this decline was also due to the modest development of segment's other business lines. At the same time, important strategic initiatives were initiated over the course of the year so as to sustainably reinforce the segment's competitiveness and promote future growth. Among other measures, a comprehensive sales offensive was launched with the aim of winning new customers and strengthening existing customer relationships. In addition, the website was relaunched in the first half of 2025 and now offers significantly enhanced visuals and descriptions of the products and services on offer. Internal processes were also honed and structured more efficiently to enable a faster and more flexible response to market requirements. Special emphasis is being placed on expanding the customer portfolio, along with the targeted development of Managed Services. The decline in cost of materials was disproportionate compared with revenue in the period under review. Furthermore, the slight upturn in network-related and structural costs was offset by growth in other operating income. Consequently, the segment's gross profit fell from EUR 7.8 million in the previous year's period to EUR 6.8 million. At EUR 2.9 million, personnel expenses remained unchanged from the year-earlier level (9M 2024: EUR 3.0 million). Against the backdrop of the revenue trend, segment EBITDA declined to EUR 2.4 million, down from EUR 3.3 million in the first nine months of 2024. The EBITDA margin was raised slightly to 23.5% in the reporting period, up from 22.8%.

Development of the ITC segment in EUR million

Renewable Energies segment

As a result of the ongoing work on the conversion of the Langendorf Wind Farm, the value of the wind energy produced in the period under review did not match the previous year's figure. In the first nine months of 2025, the electricity produced by the power plants declined by 28.4% overall to 24.1 GWh compared with 33.6 GWh the year before. By contrast, there was a gratifyingly significant increase in the volume of solar energy generated during the period under review. The power produced by the Adelebsen Solar Park rose 9.5 GWh in the reporting period, thereby significantly exceeding the year-earlier figure of 8.5 GWh. The energy generated by the Langendorf and Klostermoor wind farms is sold at the agreed fixed price terms and conditions in 2025. Power from the Roge Wind Farm is sold at the market price prevailing in the respective month. Generally speaking, monthly market prices for onshore wind energy developed well in the first nine months of the current year. The average monthly market price for onshore wind amounted to 7.50 ct/kWh in the months of January to September 2025 (9M 2024: 5.73 ct/kWh). As a result, the Renewable Energies segment's revenue dipped only slightly year on year, dropping 0.5% to EUR 3.6 million (9M 2024: EUR 3.7 million). Since, however, expenditure on the maintenance and repair of the wind energy facilities was significantly lower in the first nine months of 2025 than in the previous year, segment EBITDA improved accordingly, rising by 6.3% to EUR 2.4 million (9M 2024: EUR 2.3 million). The EBITDA margin improved notably, up from 62.9% to currently 67.2% in the period under review.

Development of the Renewable Energies segment in EUR million

HVAC (Heating, Ventilation and Air Conditioning Technology) segment

Germany's HVAC sector remained caught in the force field between the politically pursued energy transition and real economic constraint. There are several reasons for the discrepancy between political objectives and practical implementation: End customers' uncertainty, slow-off-the-mark municipal heat planning and the lack of clarity about subsidy conditions are putting a damper on investments. Consequently, the business environment in the sanitary, heating and air conditioning industry deteriorated further in recent months, triggering a significant downturn in demand. The HVAC segment was unable to counteract this development despite the strategic measures initiated in the spring, including expanding the product range, tapping into new market segments, and stepping up sales activities. Owing to the acquisition of the EMPUR Group in February 2025, the segment's total revenue nevertheless grew by a pleasing 15.2% to EUR 28.2 million (9M 2024: EUR 24.5 million). In organic terms, segment revenue nevertheless declined by 8.2%. The cost of materials increased by 15.3%, which is consistent with revenue and thus at a rate proportionate to revenue. Consequently, the cost of materials ratio at 80.8% also remained virtually unchanged from the previous year's level (9M 2024: 80.7%). As a result, gross profit also rose by 15.4%, from EUR 5.0 million to EUR 5.8 million. Against the backdrop of higher structurally-induced costs, with higher workforce numbers as a result of company takeovers and the restructuring costs envisaged, EBITDA came in at EUR –4.0 million in the first nine months of 2025 (9M 2024: EUR –0.5 million).

Development of the SHAC segment in EUR million

Financial position and net assets

Total assets stood at EUR 145.4 million as of 30 September 2025 (31 December 2024: EUR 126.8 million). On the assets side, the increase is mainly attributable to the higher level of non-current assets — here especially property, plant and equipment — that rose by EUR 21.6 million. On the liabilities side, the Group reported an increase of EUR 21.3 million in current liabilities which was principally due to the higher volume of short-term bank loans in connection with the Langendorf repowering project. Property, plant and equipment rose considerably, from EUR 38.4 million to EUR 57.5 million, also in connection with repowering Langendorf and acquiring the property in Buchholz-Mendt. Furthermore, assets have increased due to usage rights secured in the Renewable Energies segment, a development principally attributable to lease agreements, both renewed and newly concluded, in the context of the Langendorf repowering project.

The Group acquired 200 Bitcoin as a strategic reservoir of value in 2024. These Bitcoin are recorded at the cost of purchase in an amount of EUR 12.1 million under intangible assets. In addition, more Bitcoin were bought in the during the reporting period for the purpose of short-to medium-term financing and liquidity management as part of the treasury strategy. Accordingly, the Other current receivables and assets position showed an increase of EUR 16.4 million to EUR 19.4 million as of the reporting date on 30 September 2025 (31 December 2024: EUR 3.0 million). By the end of the third quarter, 3U HOLDING AG held 363.2 Bitcoin in total.

Along with the EMPUR takeover, the completion of the new administration building in Marburg and the Langendorf repowering project, the decline in cash and cash equivalents by EUR 22.7 million to EUR 19.9 million is to be seen mainly in the context of Bitcoin acquisitions in 2025.

Following the significant balance sheet extension as of 30 September 2025, the equity ratio decreased to 56.4% (31 December 2024: 69.2%). Non-current and current liabilities rose overall, from EUR 39.1 million to EUR 63.4 million, which led to a higher debt-to-equity ratio of 77.2% (31 December 2024: 44.5%). The sum total of current and non-current financial liabilities grew by EUR 19.2 million to EUR 45.4 million in the first nine months of the year (31 December 2024: EUR 26.2 million), representing net debt of EUR 25.4 million as of the reporting date on 30 September 2025 (31 December 2024: net cash position of EUR 16.4 million). The substantial increase in financial liabilities on the balance sheet date is also attributable to the interim financing of EUR 22.4 million for the Langendorf Wind Farm repowering project, as well as acquiring a property costing EUR 2.0 million at the EMPUR location in Buchholz-Mendt.

The cash flow from operating activities reported a cash outflow of EUR 19.4 million in the first three quarters of the financial year 2025 (9M 2024: cash inflow of EUR 2.1 million). This outflow of funds was principally attributable to the negative result for the period in the context of buying Bitcoin under the treasury strategy. A further reason was the increase in inventories to be seen largely in connection with the EMPUR takeover. A countertrend emanated from the higher level of trade payables, along with changes in other liabilities.

Condensed cash flow statement (kEUR)		9M
	2025	2024
Cash flow	–22,738	–18,049
Cash flow from operating activities	–19,442	2,144
Cash inflow/outflow from investing activities	–21,405	–20,708
Cash inflow/outflow from financing activities	18,109	515
Change in restrictions on cash and cash equivalents	–2	0
Total changes from cash and cash equivalents	–22,740	–18,049
Cash and cash equivalents at the start of the period	39,654	52,440
Cash and cash equivalents at the end of the period	16,914	34,391

Significant events after the end of the reporting period 13

No events of material significance for 3U HOLDING AG or that would have significantly impacted the Group's financial position, net assets and results of operations occurred after the balance sheet date of 30 September 2025.

Outlook

Developments in the ITC and Renewable Energies segments are in line with the expectations originally communicated. In the ITC segment, the Management Board anticipated a decline in revenue in 2025, with earnings holding steady. In the Renewable Energies segment, the applications submitted for the purpose of expanding capacities within the Group, as well as work on the repowering project in Langendorf, are proceeding to plan. With regard to the Langendorf repowering project, the conversion also necessitated the shutdown of seven old wind turbines. As expected, this measure is reflected in the earnings for financial year 2025 and therefore also in the segment's revenue trend. Solar power performed well. In the first three quarters of 2025, 3U's Adelebsen Solar Park had already produced significantly more environmentally compatible electricity than in the year-earlier period.

The business environment in the Group's largest sales market, namely its HVAC segment, has deteriorated significantly in recent months. The main reasons stem from the ongoing uncertainty regarding the political and economic framework conditions which has prompted notable reticence on the part of customers, thereby leading to demand slumping in the segment. This scenario necessitated adjustments to our guidance for 2025.

In the current financial year, the target parameters envisaged are therefore anticipated below the range communicated back in March. According to current estimates, consolidated revenue is likely to amount to between EUR 54.0 million and EUR 56.0 million (original forecast: EUR 62.0 million to EUR 66.0 million). In terms of profitability and given the expenditure necessitated by the restructuring measures initiated in the HVAC's e-commerce operations, the Management Board anticipates the Group's EBITDA in a range of EUR –2.5 million to EUR –3.5 million (original guidance: negative EBITDA).

15

16 Statement of financial position

Assets — 3U Group (kEUR)	30/09/2025	31/12/2024
Non-current assets	84,777	63,151
Intangible assets	17,803	17,424
Property, plant and equipment	57,463	38,404
Rights of use	4,517	2,326
Investment property	3,486	3,539
Other financial assets	126	125
Deferred tax assets	1,006	967
Other non-current assets	376	366
Current assets	60,604	63,677
Inventories	14,894	12,827
Trade receivables	4,773	3,548
Contract assets	0	213
Income tax receivables	1,678	1,492
Other current assets	19,371	2,971
Cash and cash equivalents	19,888	42,626
Total assets	145,381	126,828

Shareholders' equity and liabilities — 3U Group (kEUR)	30/09/2025	31/12/2024
Shareholders' equity	82,030	87,757
Subscribed capital	36,816	36,816
Treasury shares	–3,241	–3,241
Capital reserve	7,709	7,709
Retained earnings	36,685	36,685
Profit/loss carried forward	9,113	8,381
Net income	–5,710	732
Total shareholders' equity attributable to the shareholders of 3U HOLDING AG	81,372	87,082
Minority interest	658	675
Non-current liabilities	27,604	24,597
Non-current provisions	1,543	1,517
Non-current financial liabilities	21,473	20,471
Non-current lease liabilities	3,778	1,841
Deferred tax liabilities	385	412
Other non-current liabilities	425	356
Current liabilities	35,747	14,474
Current provisions	460	499
Current income tax liabilities	503	341
Current financial liabilities	23,958	5,744
Current lease liabilities	828	622
Trade payables	6,386	5,157
Other current liabilities	3,612	2,111
Total shareholders' equity and liabilities	145,381	126,828

Consolidated statement of income 19

3U Group (kEUR)	Q3	9M
	2025	2024	2025	2024
Revenue	13,063	13,158	41,348	42,136
Other operating income	704	660	1,985	2,714
Changes in inventories of finished services and work in progress	123	408	687	982
Other capitalised services	18	21	128	44
Cost of materials	–9,201	–8,827	–27,690	–28,230
Gross profit/loss	4,707	5,420	16,458	17,646
Personnel expenses	–3,356	–2,680	–10,382	–8,044
Other operating expenses	–2,265	–1,934	–7,256	–6,150
Restructuring expenses	–682	0	–682	0
EBITDA	–1,596	806	–1,862	3,452
Depreciation and amortisation	–1,029	–915	–2,951	–3,028
EBIT	–2,625	–109	–4,813	424
Financial income	30	221	294	918
Financial expenses	–222	–145	–711	–407
Financial result	–192	76	–417	511
EBT	–2,817	–33	–5,230	935
Income taxes	–110	11	–299	–155
Net profit/loss for the period	–2,927	–22	–5,529	780
Of which attributable to minority interest	89	–25	181	13
Of which consolidated net income	–3,016	3	–5,710	767
Earnings per share, basic (EUR)	–0.09	0.00	–0.17	0.02
Earnings per share, diluted (EUR)	–0.09	0.00	–0.17	0.02

20 Segment information

9M 2025 (kEUR)	ITC	Renew able Ener gies	HVAC	Subtotal	Other activities	Recon ciliation	Group
Third-party revenue	9,546	3,633	28,169	41,348	0	0	41,348
Revenue from other segments/busi ness areas	649	0	27	676	1,677	–2,353	0
Intercompany revenue (intra-segment revenue)	776	93	21,945	22,814	0	–22,814	0
Total revenue	10,971	3,726	50,141	64,838	1,677	–25,167	41,348
Less intercompany revenue	–776	–93	–21,945	–22,814	0	22,814	0
Segment revenue/Group revenue	10,195	3,633	28,196	42,024	1,677	–2,353	41,348
Other operating income	898	572	209	1,679	555	–249	1,985
Changes in inventory	0	521	166	687	0	0	687
Other capitalised services	0	70	0	70	0	58	128
Cost of materials	–4,284	–632	–22,774	–27,690	0	0	–27,690
Gross profit/loss	6,809	4,164	5,797	16,770	2,232	–2,544	16,458
Personnel expenses	–2,938	–457	–4,766	–8,161	–2,221	0	–10,382
Other operating expenses	–1,479	–1,265	–4,384	–7,128	–2,294	2,166	–7,256
Restructuring expenses	0	0	–682	–682	0	0	–682
EBITDA	2,392	2,442	–4,035	799	–2,283	–378	–1,862
Depreciation and amortisation	–425	–1,363	–792	–2,580	–670	299	–2,951
EBIT	1,967	1,079	–4,827	–1,781	–2,953	–79	–4,813
Other financial result	139	–1,113	–623	–1,597	–77	1,257	–417
Income tax	–79	–240	6	–313	0	14	–299
Result for the period*	2,027	–274	–5,444	–3,691	–3,030	1,192	–5,529
Of which attributable to minority
interest	0	181	0	181	0	0	181
Segment result*/Group result	2,027	–455	–5,444	–3,872	–3,030	1,192	–5,710

^*Before profit transfer

21

9M 2024 (kEUR)	ITC	Renew able Ener gies	HVAC	Subtotal	Other activities	Recon ciliation	Group
Third-party revenue	13,995	3,652	24,484	42,131	5	0	42,136
Revenue from other segments/busi
ness areas	560	0	0	560	1,544	–2,104	0
Intercompany revenue (intra-segment revenue)	1,024	86	16,351	17,461	0	–17,461	0
Total revenue	15,579	3,738	40,835	60,152	1,549	–19,565	42,136
Less intercompany revenue	–1,024	–86	–16,351	–17,461	0	17,461	0
Segment revenue/Group revenue	14,555	3,652	24,484	42,691	1,549	–2,104	42,136
Other operating income	864	434	269	1,567	1,281	–134	2,714
Changes in inventory	0	958	0	958	0	24	982
Other capitalised services	0	0	24	24		20	44
Cost of materials	–7,622	–854	–19,754	–28,230	0	0	–28,230
Gross profit/loss	7,797	4,190	5,023	17,010	2,830	–2,194	17,646
Personnel expenses	–2,983	–405	–2,569	–5,957	–2,087	0	–8,044
Other operating expenses	–1,498	–1,489	–2,976	–5,963	–2,020	1,833	–6,150
Restructuring expenses	0	0	0	0	0	0	0
EBITDA	3,316	2,296	–522	5,090	–1,277	–361	3,452
Depreciation and amortisation	–439	–1,525	–544	–2,508	–744	224	–3,028
EBIT	2,877	771	–1,066	2,582	–2,021	–137	424
Other financial result	202	–1,026	–673	–1,497	2,470	–462	511
Income tax	38	–165	–61	–188	0	33	–155
Result for the period*	3,117	–420	–1,800	897	449	–566	780
Of which attributable to minority
interest	0	13	0	13	0	0	13
Segment result*/Group result	3,117	–433	–1,800	884	449	–566	767

^*Before profit transfer

22 Financial calendar

• Publication of the Quarterly Announcement 3/2025 11 November 2025
• Annual General Meeting 2026 3 June 2026

The current financial calendar is available on the 3U HOLDING AG website (www.UUU.de).

Contact 23

Company/postal address 3U HOLDING AG Zu den Sandbeeten 1 b 35043 Marburg Germany

Investor Relations Thomas Fritsche Tel. : +49 (0) 6421 999-1200 ir@UUU.de www.UUU.de

Imprint

Published by

Zu den Sandbeeten 1 b 35043 Marburg

3U HOLDING AG

Germany

Photographs

kura — stock.adobe.com (title) // miss irine — stock.adobe.com (page 14) // zinkevych — stock.adobe.com (page 18) //

Font

Interstate by Tobias Frere-Jones (manufacturer: The Font Bureau)

Translation

Diana Polkinghorne MBA, BA DP Business & Financial Translations

© 2025 3U HOLDING AG, Marburg

24 Disclaimer

This quarterly announcement contains statements relating to the future which are subject to risks and uncertainties and which are assessments of the management of 3U HOLDING AG and reflect its current opinions with regard to future events. Such predictive statements can be recognised by the use of terms such as "expect", "assume", "estimate", "anticipate", "intend", "can", "plan", "project", "will" and similar expressions. Statements relating to the future are based on current and valid plans, estimates and expectations. Such statements are subject to risks and uncertainties, most of which are difficult to estimate and which are generally beyond the control of 3U HOLDING AG.

The following are — by no means exhaustive — examples of factors that may trigger or affect a deviation: the development of demand for our services, competitive factors — including price pressure —, technological changes, regulatory measures, risks in the integration of newly acquired companies. If any of these or other risks and uncertain factors occur, or if the assumptions on which the statements are based prove to be incorrect, the actual results of 3U HOLDING AG may differ materially from those outlined or implied in these statements. The company does not undertake to update predictive statements of this nature.

This quarterly announcement contains a range of figures which are not part of commercial regulations and the International Financial Reporting Standards (IFRS), such as EBT, EBIT, EBITDA and EBITDA adjusted for special influences, adjusted EBITDA margin, investments (capex). These figures are not intended to substitute the information for 3U HOLDING AG in accordance with the German Commercial Code (HGB) or IFRS. It should be noted that the figures for 3U HOLDING AG which are not part of commercial regulations and the IFRS, can only be compared to the corresponding figures of other companies to a certain extent.

The interim consolidated financial statements and the interim Group management report were neither audited in accordance with § 317 HGB nor reviewed by an auditor.

The English translation was prepared for convenience reasons. The only binding document is the original German quarterly announcement.

3U Group* 3

3U HOLDING AG

ITC

3U TELECOM GmbH

Marburg, Germany

3U TELECOM GmbH

Vienna, Austria

cs communication systems GmbH

Pleidelsheim, Germany

cs network GmbH telecommunication services

Pleidelsheim, Germany

Discount Telecom S&V GmbH

Marburg, Germany

LineCall Telecom GmbH

Marburg, Germany

OneTel Telecommunication GmbH

Marburg, Germany

RISIMA Consulting GmbH

Marburg, Germany

Renewable Energies

3U ENERGY AG

Marburg, Germany

3U ENERGY PE GmbH

Marburg, Germany

3U Euro Energy Systems GmbH

Marburg, Germany

Repowering Sachsen-Anhalt GmbH

Marburg, Germany

Solarpark Adelebsen GmbH

Adelebsen, Germany

Windpark Klostermoor GmbH & Co. Betriebs-KG

Marburg, Germany

Windpark Langendorf GmbH & Co. KG

Marburg, Germany

Windpark Langendorf Verwaltungsgesellschaft mbH

Marburg, Germany

Windpark Merzdorfer Heide II GmbH & Co. KG

Marburg, Germany

Windpark Roge GmbH

Marburg, Germany

Windpark Roge GmbH & Co. Betriebs-KG

Marburg, Germany

HVAC

Calefa GmbH

Koblenz, Germany

EM-PLAN GmbH

Marburg, Germany

EMPUR Produktionsgesellschaft mbH

Buchholz-Mendt, Germany

PELIA Gebäudesysteme GmbH

Koblenz, Germany

Selfio SE

Koblenz, Germany

^*Fully consolidated companies at the time of reporting

3U HOLDING AG Zu den Sandbeeten 1 b 35043 Marburg Germany

Tel.: +49 (0) 6421 999-0

www.UUU.de