Regulatory announcement no 20: Interim report 1 January - 30 June 2026. Reported revenue growth of 29.5% and adj. EBITA up 34.6% in H1 2026. Outlook reiterated

About this update from Installatorgruppen A/s

Highlights H1 2026 Financial performance Revenue was up 29.5% to DKK 2,222 million, driven by growth across the majority of our portfolio and by acquisitions. Organic growth of 2.2%, in line with our expectations, despite cold weather and a strong H1 2025. Adjusted EBITA was up 34.6% to DKK 207 million and the margin up 0.3ppt. to 9.3%. Denmark's EBITA was DKK 176 million (H1 2025: DKK 149 million) at a margin of 9.3% (9.1%), and Switzerland turned profitable with EBITA of DKK 19 million against a loss of DKK 9 million, at a margin of 5.8%. Adjusted free cash flow was DKK 141 million (H1 2025: DKK 163 million) at an adjusted cash conversion rate of 71.3%, reflecting the seasonal working capital build-up. Net interest‑bearing debt was DKK 1,090 million, equal to leverage of 2.0x, driven by acquisitions, the earn‑out revaluation, the buy-back of own shares at the IPO and the seasonal working capital build-up. Business update Admitted to trading on Nasdaq Copenhagen on 11 June 2026. Eight acquisitions including three add‑ons were completed, six in Denmark and two in Switzerland, taking the Group to 47 companies. Erik Lytzen followed in July, and several companies are currently in due diligence. The order book grew to DKK 4.3 billion at 30 June 2026 (31 December 2025: DKK 3.6 billion), equal to organic growth of 9.8% measured on the companies owned at the turn of the year. A new DKK 1,750 million five-year revolving credit facility took effect on listing. Outlook The 2026 outlook is reiterated: reported revenue of DKK 4,650 to 4,900 million, adjusted EBITA of DKK 415 to 465 million and reported EBIT of DKK 225 to 285 million, with combined revenue of DKK 5,450 to 5,700 million and combined adjusted EBITA of DKK 475 to 525 million. Niels Eldrup Meidahl, Group CEO, says: “Based on solid performance of the underlying business, InstallatørGruppen delivered strong reported revenue and EBITA growth in H1 2026. Organic growth was more modest, impacted by the timing of revenue moving into H2 as a prolonged winter caused project delays. However, our order book stood at DKK 4.3 billion on 30 June against DKK 3.6 billion at the beginning of the year, and we start H2 with more contracted work in hand than at any point in our history. On that basis we confirm our guidance for the full year.” Key figures DKK million (unless otherwise stated) Q2 2026 Q2 2025 H1 2026 H1 2025 Revenue 1,150 918 2,222 1,716 Adjusted EBITA 113 101 207 154 Special items 25 9 56 17 EBITA 88 92 151 137 Adjusted EBITA margin, % 9.9 11.0 9.3 9.0 Adjusted free cash flow 26 67 141 163 Number of stand-alone acquisitions 4 3 5 7   Conference call and webcast InstallatørGruppen presents the interim report on 26 August 2026 at 10:00 CEST, in English, followed by a Q&A session. Presentation of the interim report for H1 2026 Webcast Link to webcast Telephone conference Registration in advance is required at Link to telephone conference Materials Investors.installergroup.com Financial calendar Reporting dates for 2026 and 2027 Q3 trading statement 28 October 2026 Full-year results 2026 4 March 2027 Annual Report 2026 18 March 2027 Annual General Meeting 22 April 2027 Contacts For further information Investor Relations Maximillian Hjorth Beste, Head of M&A and Investor Relations +45 2899 2846  |  [email protected] Company InstallatørGruppen A/S, Støden 6, 1., DK-4000 Roskilde  |  Company registration number 43891871 Attachment Interim Report H1 2026

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