Alphabet shares fall 5% as AI pioneer Jeff Dean exits in major shakeup

Alphabet's shares dropped 5% following the departure of AI pioneer Jeff Dean, who is leaving to launch a new AI startup called Discovery Loop, focused on automating scientific discovery. This exit is part of a larger leadership restructuring within Alphabet's AI divisions, with Google DeepMind CTO Koray Kavukcuoglu being promoted to Senior Vice President. Alphabet will also be a founding investor and cloud computing partner for Dean's new venture.