Sep 28, 2026 · 6 min
Nvidia expands buybacks as markets punish leadership risk
Closing Bell: Kodiak Surges, MongoDB Plunges, Boeing Falls
The session shows how capital returns, executive moves, regulatory delays, clinical data, and rising yields can pull stocks sharply in opposite directions.
- 1Nvidia raised its remaining buyback authorization to $235 billion through fiscal 2028.
- 2MongoDB plunged after its CEO left to lead Meta’s enterprise AI platform.
- 3Boeing fell as the FAA delayed 737 MAX 10 certification over a software issue.
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MongoDB’s sharp decline after its CEO was recruited by Meta illustrates how leadership changes can become immediate market catalysts.
The brief
Nvidia led the gainers after expanding its share buyback authorization by $150 billion, leaving $235 billion available through fiscal 2028.
Kodiak Sciences rallied sharply after positive late-stage drug-trial results, showing how clinical news can quickly reshape a stock’s valuation.
MongoDB plunged when its CEO was recruited by Meta to lead a new enterprise AI platform, turning an executive transition into a market event.
Boeing also fell after the FAA delayed certification of the 737 MAX 10 over a software issue, while Meta extended its recent losses.
The broader backdrop was less company-specific: the 10-year Treasury yield began a fifth consecutive week of increases, pressuring markets across the curve.
Romaine Bostick
Nvidia Corporation
Muse Glimmer
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