Broadcom Drops Over 4% as AI Slowdown Calls and Rising Yields Slam Semiconductor Stocks

Broadcom shares fell more than 4% on September 14, 2026, as a broad semiconductor selloff was triggered by public calls from Anthropic CEO Dario Amodei and OpenAI CEO Sam Altman urging the AI industry to slow the pace of frontier model development. Amodei published a roughly 3,800-word essay arguing that AI capabilities are outpacing safety controls, while Altman aligned with the view that development should be "paced." Elon Musk's xAI voiced agreement. The statements rattled hardware names across the board, with the Philadelphia Semiconductor Index plunging 5.9%, Marvell falling 7%, Micron declining 5%, and Nvidia pulling back roughly 3%. The Nasdaq 100 slipped 0.8% and the S&P 500 lost about 0.5%, compounded by the 10-year Treasury yield breaching 5% for the first time since October 2023 and a surge in crude oil prices.

The selling in Broadcom came on top of existing pressure: the stock had already declined roughly 5% over the prior 12 days after the company missed Wall Street's revenue expectations for fiscal Q4 2026, even though its fiscal Q3 results beat on both sales and earnings. The company had also announced Anthropic as its next AI networking customer poised to surpass Google in revenue contribution, and offered a $21.7 billion AI revenue forecast, but neither development was enough to offset the macro and sentiment headwinds on the day.

Despite the selloff, Mizuho Securities analyst Vijay Rakesh maintained a bullish view, predicting that Broadcom would rally to a new all-time high over the next 12 months. Some market commentators argued that Broadcom, not Nvidia, is better positioned to win the next leg of AI infrastructure spending, pointing to its custom chip business and expanding hyperscaler customer roster. Broadcom CEO Hock Tan was scheduled to appear on CNBC's "Mad Money" Monday evening, where he was expected to address the company's outlook.