On March 10, just hours after Silicon Valley Bank collapsed, the hedge fund manager Bill Ackman hosted a dinner for about 20 people at his penthouse apartment in Manhattan.The dinner had been planned, and the boldface names were there to discuss Ukraine. But before talk turned to the war, Mr. Ackman sought out the one person in the room who he thought might have a solution to SVB: Jamie Dimon, the chief executive of JPMorgan Chase.Mr. Ackman asked Mr. Dimon, who had led the rescue of two banks during the 2008 financial crisis, if he would consider buying Silicon Valley Bank, according to two dinner attendees.Not this time, Mr. Dimon said.Four days later, on March 14, Tre …
