Sicily’s Civil Protection department identified Morgan Stanley International Bank chairman Jonathan Bloomer and Clifford Chance lawyer Chris Morvillo as missing in an update to the BBC, APA reports.
UK tech tycoon Mike Lynch and his 18-year-old daughter were earlier confirmed as missing after the sinking, which happened about 700m (2,300ft) from the Mediterranean island's shore.
The 56m Bayesian was carrying 22 people including Brits, Americans and Canadians. Fifteen people were rescued, including a one-year-old British girl.
A man's body has been recovered. He has not been formally identified, but the Palermo coastguard said he was the ship's cook.