Alphabet falls after AI leadership shake-up
Shares fall after AI leadership changes
** Alphabet's GOOGL.O shares fall 5.3% to $357.70
** Co shakes up AI leadership; Google DeepMind CEO Demis Hassabis to leave main managerial role
** Hassabis to take newly created title of GOOGL's chief scientist and transition to being DeepMind chairman
** Several leaders of co's Gemini efforts, including veteran engineer Jeff Dean, to depart the company
** Including session's moves, stock up 14.3% YTD
