Trema International, the firm's largest current shareholder, will reduce its stake from 69% to under 37% as part of the offering.
Rovio has built an empire around its popular mobile game Angry Birds, including toys, clothes and an animated 3-D movie.
The gaming app, which was released in 2009, allows players to sling virtual birds at enemy pigs to save their eggs.
As recently as in 2015, it was struggling to change its business model amid fierce competition.
But revenue soared 94% over last year during the second quarter due to the movie and a strong performance from its games.
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