Swiss banker Boris Collardi burst back onto the financial scene on Friday when EFG International AG said he was buying a 3.6% stake and would get a seat on its board of directors. Private bank and asset manager EFG said Spiro J. Latsis intended to sell the stake to Collardi, who it proposed as a member of the board. The board intended to convene an extraordinary shareholders' meeting to elect Collardi "in the coming months once all regulatory filings and approvals have been completed", it said.