Viru is a 5.0% ABV pilsner-style beer brewed in Estonia. It is brewed in the country's second largest city, Tartu, by the A. Le Coq brewery. The brand is owned by Baltic Beer Company Ltd (formerly Brand Independence Ltd), based in London, UK, and is brewed under licence in Estonia. A. Le Coq is the second largest brewery in Estonia, with a market share of 36.8% in 2005.
The largest brewery in Estonia has over 60% of the market share
The context doesn't mention the market share size of the other breweries