Silja Line runs ferries in the Baltic, mostly from Helsinki to Sweden and Estonia. The ferry line carried around 5 million passengers last year.
NorFerries, known mostly for setting up routes for cargo ships and passenger ferries, is offering EUR 520 million (USD 671 million) for Silja Line.
"We look at this as a good opportunity," NorFerries chairman Sigurd E Steen told news bureau Reuters. He noted that Silja "is making money today and we think it will make more money in the future."
Bermuda-based Sea Containers said last year that it wanted to sell off Silja Line and its other ferry operations to stem losses.
NorFerries' bid is expected to be challenged by Silja Line's rivals in the Baltic, Tallink and Viking Line. Both have said they're interested in buying Silja as well.
