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Sika posts half-year sales growth of 4.0% in local currencies worldwide; CHF 80 million savings in 2026 Sika delivers 4.0% local currency revenue growth and upgrades full-year growth expectations Ad hoc announcement pursuant to Article 53 of the Listing Rules of the SIX Exchange Regulation Sika posts half-year sales growth of 4.0% in local currencies; reported sales of CHF 5.59 billion; (-1.5% in CHF, including a foreign currency effect of -5.5%) ...

Sika reports 4.0% local-currency revenue growth worldwide; upgrades full-year growth expectations. Half-Year Report 2026 2026 Sika Half-Year Report sika.com/halfyear CONTENT AT A GLANCE …………………………………………….. 3 Half-year results …………………………………………. 3 Sika Group key figures …………………………………. 4 Investor information ……………………………………. 5 LETTER TO STAKEHOLDERS ……………………….. 6 REGIONS ……………………………………………………. 8 The regions in brief ……………………………………… 10 INTERIM FINANCIAL STATEMENTS ……………. 11 Consolidated income statement …………………… 11 Consolidated statement of comprehensive income ……………………………………………………….. 12 Consolidated balance sheet ………………………….. 13 Consolidated statement of changes in equity … 14 Consolidated statement of cash flows …………… 15 NOTES TO THE INTERIM FINANCIAL STATEMENTS ……………………………………………. 16 Principles of consolidation and valuation ……….. 16 Supporting information to the interim financial statements ………………………………………………… 19 FINANCIAL CALENDAR ………………………………. 24 AT A GLANCE LETTER TO STAKEHOLDERS REGIONS INTERIM FINANCIAL STATEMENTS NOTES TO THE INTERIM FINANCIAL STATEMENTS FINANCIAL CALENDAR 2 ...

Sika worldwide delivers 4.0% local currency revenue growth; Outlook raised to 3–6% local-currency growth. Sika_Media Release_HY26_en Ad Hoc Announcement Pursuant to Article 53 of the SIX Exchange Regulation Listing Rules SIKA DELIVERS 4.0% LOCAL CURRENCY REVENUE GROWTH AND UPGRADES FULL-YEAR GROWTH EXPECTATIONS • Sika posts half-year sales growth of 4.0% in local currencies; reported sales of CHF 5.59 billion; (-1.5% in CHF, including a foreign currency effect of -5.5%) • Organic growth of 2.9%; acquisition effect of 1.1% • Material margin up 60 bps year on year to 55.7% • EBITDA of CHF 1.06 billion, with an EBITDA margin of 19.0%; up 10 bps year on year • Net profit of CHF 552.1 million (2025: CHF 554.4 million); diluted earnings per share of CHF 3.43 (2025: CHF 3.45) • Operating free cash flow of CHF 139.6 million (2025: CHF 181.9 million) • Fast Forward program on track to deliver CHF 80 million in savings in 2026 • Record employee engagement score of 88 index points, surpassing strategic target • Outlook for 2026: Sales growth now expected 3% to 6% in local currencies; EBITDA margin of 19.0% to 19.5%. Sika is comfortable with current consensus CHF EBITDA expectations • Medium-term targets for sustainable, profitable growth reaffirmed under Strategy 2028 In the first half of the year, Sika delivered 4.0% revenue growth in local currencies, with organic growth of 2.9%. In the second quarter, both local currency and organic growth accelerated compared to the first quarter, reaching 6.8% and 5.7%, respectively, with each region recording stronger revenue growth. Thomas Hasler, CEO: “In the first half of the year, Sika delivered improved momentum, with the second quarter building on our good start to the year. Our investments in industry-leading innovation, efficient global manufacturing and sourcing, and our digital transformation allowed us to continue to gain market share throughout the first half of the year. Our focus on delivering a best-in-class customer value proposition and forging strong customer partnerships meant that we outpaced the construction market. As a result of our accelerating leadership in MEDIA RELEASE DATE PAGE SIKA AG July 28, 2026 1 / 7 Zugerstrasse 50 6340 Baar, Switzerland www.sika.com CONTACT PHONE E-MAIL Dominik Slappnig Corporate Communications and Investor Relations +41 58 436 68 21 slappnig.dominik@ch.sika.com ...