Alphabet's stock opened weaker in pre-market trade, falling roughly 1.3% as the company extends a multi-session slide tied to a growing roster of resignations among key AI researchers. The most immediate spark for the move was a report indicating that Jonas Adler and Alexander Pritzel - both described as core contributors to Google's Gemini AI model - are leaving to join Anthropic, the startup behind the Claude models and backed by Amazon and Google.
These departures come on the heels of two earlier, prominent exits. Noam Shazeer, who co-led Gemini and co-authored the 2017 Transformer paper "Attention Is All You Need," departed for OpenAI on June 18. The following day, June 19, Nobel laureate John Jumper - a DeepMind scientist credited with the AlphaFold project - announced he was joining Anthropic. The rapid succession of high-profile moves has intensified concerns among some analysts about Alphabet's ability to retain top talent at the frontiers of AI research.
D.A. Davidson analyst Gil Luria summed up that anxiety, warning that the back-to-back exits raise the concern that Google is "losing the war for talent at the frontier of AI." The analyst commentary has added to the negative tone surrounding the stock as markets weigh the implications of continued departures.
Compounding the personnel losses, Google pushed back the general availability date for its Gemini 3.5 Pro model from June to July 2026, citing the need for quality refinements. Several analysts pointed out that the delay comes at a sensitive moment for enterprise procurement cycles, potentially affecting customers that were timing contracts and deployments around the originally announced availability.
Market chatter also references ongoing dilution concerns and the perception that Alphabet is investing heavily while ceding ground in the race to attract and retain researchers who build frontier AI. That narrative has helped keep sentiment fragile despite supportive developments elsewhere in the business.
Not all analysts have taken a negative view. Argus Research backed the stock following Alphabet’s recent capital raise. At the same time, Alphabet’s core business metrics remain robust: Google Cloud reported 63% year-over-year growth and the company cited a contracted backlog of $460 billion. Even with those positives, investor nerves appear sensitive to headlines about talent and product timing.
On pricing detail visible in market feeds, Alphabet A shares were shown at 345.29, down 0.84 points or 0.24% at the close on June 24, with pre-market quotes indicating a move to 341.17, off 4.12 points or 1.19% as of 08:16:09. Overall, the sequence of researcher exits, the Gemini 3.5 Pro delay, and lingering dilution questions combined to keep pressure on the stock heading into the trading session.
What to watch
- Further departures among AI researchers and engineers at Alphabet.
- Any additional changes to the Gemini product timeline or further commentary from Google about quality or availability.
- Reactions from enterprise customers tied to procurement timing.