The Securities and Exchange Commission has ended an investigation into bets that Barry Diller, Alexander von Furstenberg and David Geffen made on Activision Blizzard days before the videogame company agreed to be acquired by Microsoft in 2022, sending letters to Diller, von Furstenberg and Geffen this week that say it doesn’t plan to accuse them of insider trading tied to their purchase of Activision options, according to The Wall Street Journal’s Katherine Sayre, Jeffrey Trachtenberg and Dave Michaels.