(Adds detail, Solidium quote)
June 28 (Reuters) - SOLIDIUM OY:
* Finnish state-owned investment fund Solidium says it has increased its voting rights in paper maker Stora Enso.
* Says acquired 5,659,099 Stora Enso A shares and sold 5,690,961 R shares.
* After the transactions Solidium has 27.3 percent of the votes in Stora Enso, up from previous 25.1 percent, and holds 12.3 percent of company shares.
* "Stora Enso's A shares are seldom for sale in large amounts and we wanted to utilise the opportunity. We divested a corresponding amount of R shares", Solidium's Managing Director Antti Makinen said in a statement. Source text for Eikon: Further company coverage: (Reporting by Gdynia Newsroom and Tuomas Forsell in Helsinki; editing by Niklas Pollard)