Swedish investment firm Investor has agreed a rare deal in which it held a substantial stake in both the buyer and the seller.

A portfolio company of Investor, Biovitrum, acquired Swedish Orphan International, in which Investor is also the joint-largest shareholder, holding SEK3.5bn (€336m). Owing to a potential conflict of interest, Investor took no part in the buyer's decision-making process to bid, a spokesman said.