Alphabet shares tumble 5% as Google loses two key AI researchers to rivals

Shares of Alphabet, Google's parent company, tumbled on June 22 (local time) after the company lost two of its most prominent AI researchers to rivals. The selloff has fueled concerns that Google is falling behind in the race to attract top AI talent.

Alphabet's stock fell as much as 7 percent during trading on the New York Stock Exchange that day before closing down 5.08 percent from the previous session. The company's market capitalization shed 346 trillion won ($225 billion) in a single day, marking the largest single-day loss in its history.

The departure of key researchers from Google has been identified as the primary driver of the decline.

John Jumper, a vice president at Google DeepMind and Nobel laureate, announced June 19 that he was leaving the company to join AI startup Anthropic.

Jumper was a lead developer of AlphaFold, an AI system for predicting protein structures, and shared the Nobel Prize in Chemistry with DeepMind CEO Demis Hassabis. AlphaFold has been used to predict more than 200 million protein structures and is credited with driving breakthroughs in drug development and life sciences research.

Noam Shazeer, a vice president of engineering who co-led development of Google's flagship Gemini AI model, announced June 17 via social media that he had joined OpenAI.

Shazeer is widely regarded as one of the most influential researchers in the development of generative AI. In 2017, he co-authored "Attention Is All You Need" alongside other Google researchers — a landmark paper that laid the foundation for the transformer architecture now used in most generative AI models.

Google had invested about $2.7 billion to bring Shazeer on board in 2024.

The back-to-back departures of two prominent researchers to competitors have deepened investor concerns that Google is losing ground in the battle for AI talent.

Gil Luria, head of technology research at DA Davidson, said the high-profile exits "raise concerns that Google is losing the talent war in cutting-edge AI." He added that while Google had been considered an AI leader last year when it held some of the most capable models, its standing has since faded — and the latest departures could signal a further erosion of its competitive edge.

However, Motley Fool cautioned that the market's reaction may be somewhat excessive. Alphabet lost roughly $250 billion in market cap following news of the two departures, an amount that analysts said is difficult to justify on the basis of losing just two individuals.

Some investors have interpreted the moves by Jumper and Shazeer as a sign that the two believe OpenAI and Anthropic now hold the upper hand in AI. But Motley Fool said "the prospect of higher compensation is a plausible explanation" for the job changes, cautioning against reading the exits as evidence of a broader competitive decline at Google.