Seth Klarman’s $30 billion Baupost Group plans to return some capital to investors by year end because the hedge fund doesn’t see enough opportunities in the market. Investors were told in recent weeks that the firm expects to return capital for the third time in its history, according to a person with knowledge of the matter. Boston-based Baupost is holding 42 percent of its assets in cash and wants to balance the money it manages with potential opportunities, said the person, who declined to be named because the information is private. It is unclear how much will be given back.