SIY Sisäilmatieto Oy is a limited company based in Espoo, registered in 1998. Its taxable income in 2024 was 42 t€ and its income taxes 8 302 €. Public buyers bought 64 t€ from it in 2022–2026; the largest buyer is Ympäristöministeriö (Ympäristöministeriön hallinnonala).
Taxes
Measured by taxable income, SIY Sisäilmatieto Oy is in the upper half of the industry class business and other management consultancy activities (7664 companies with taxable income; median 16 t€, 2,7 times the median).
Taxable income is the profit as calculated for taxation, not revenue. Public data from the Finnish Tax Administration; figures for 2025 are published in November 2026. Revenue, financial ratios and employee numbers are shown once the company has filed its financial statements digitally.
Sales to public buyers
Largest buyers
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