In the report of London Stock Exchange, they highlighted 1000 of the fastest growing SMEs across the 28 countries of the European Union. Their selection criteria require companies to have shown not just growing revenue over the past three years, but also to have outperformed their sector peers. Their methodology, devised by Bureau van Dijk, listed SMEs are private and registered in the EU-countries and their revenues has to be between 20 and 300 million euros.
You can find the Talouselämä article here (in Finnish): https://www.kauppalehti.fi/uutiset/euroopan-dynaamisten-kasvuyritysten-listalle-ylsi-20-suomalaista/tisTBgLC
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