Chip Stocks Just Had Their Worst Day Since June — The Meta Shock That Sparked a Global AI Selloff

Chip stocks just suffered their worst day since June. The Philadelphia Semiconductor Index plunged 6.7% on Thursday, October 22, as investors abruptly turned on the artificial intelligence trade after Meta Platforms revealed how expensive its AI ambitions have become. Intel, AMD, Marvell and SanDisk each fell more than 8%, Lam Research dropped nearly 12%, and by Friday morning the selloff had rolled through Asia, knocking South Korea's Kospi down 2.36% at the open.

What Happened: The Numbers Behind the Rout

The Nasdaq Composite fell 2.6% to 26,008.86, its worst session since June. The S&P 500 lost 1.2% to 7,663.43, its worst day since July, while the Dow Jones Industrial Average barely moved, edging up 0.02% to 52,873.28 as money rotated into defensive and value names. The damage was concentrated in chips: the Philadelphia Semiconductor Index's 6.7% plunge was its biggest one-day percentage decline since June 23.

Among the hardest hit were Lam Research, down 11.8% to $230.15, KLA down 9.5%, Marvell down 8.7%, Applied Materials down 8.2%, and Intel down 8.04% to $85.49 from a previous close of $92.96. Nvidia fell 4.4%, Broadcom fell 4.3%, TSMC fell 4.5%, and Micron lost 6.3%. Optical and networking names tied to data centers were hit even harder in places, with Coherent down about 12.5% and Lumentum down about 11.5%.

Why It's Blowing Up: Meta's Bill Came Due

The trigger was Meta. The company beat earnings expectations, but investors focused on the cost of its AI buildout: capital spending of $34.91 billion in the third quarter alone, negative free cash flow of $2.12 billion, a narrowed full-year capex forecast of $135 billion to $145 billion, and roughly $825 billion in future spending commitments, alongside plans for new non-voting shares to help fund expansion. Meta shares fell about 7%, erasing roughly $124 billion in market value in a single session.

The question spreading across Wall Street is no longer whether AI demand is real — it is how much capital the boom requires and when the returns arrive. Tesla added to the unease by cutting its 2026 capital spending outlook from more than $25 billion to about $20 billion, a move read as spending discipline replacing capex euphoria, with knock-on risks for every supplier in the chain. Rising oil prices piled on: Brent crude pushed above $112 a barrel and hit a five-month peak near $114 on Friday after Houthi attacks on Saudi energy facilities stoked supply fears.

The Flight to Safety — and the Spread to Asia

As stocks slid, investors rushed into U.S. Treasuries. The 10-year yield dropped more than 19 basis points to below 5% for the first time in nearly a month, its biggest single-day decline since March 2023, and the move extended into the biggest daily Treasury rally in more than three years. Markets also pared back bets on further Federal Reserve tightening, with the implied probability of a December rate rise falling to 85%.

Asia took the baton on Friday. South Korea's Kospi opened down 2.36% at 5,403.17, with Samsung Electronics falling more than 5% in early trade and SK Hynix also lower. Japan's Nikkei fell 1.3% on the day and about 5% for the week, with Kioxia down more than 7% early. MSCI's broad Asia-Pacific index outside Japan fell 0.3%, heading for a fourth straight weekly loss, and an index of mainland Chinese blue chips touched its lowest level since July 2025. The turmoil was strong enough that SK Hynix dropped plans for a U.S. listing of its Solidigm unit, citing market volatility.

Key Facts

• Philadelphia Semiconductor Index: -6.7%, worst day since June 23
• Nasdaq Composite: -2.6% to 26,008.86; S&P 500: -1.2% to 7,663.43; Dow: +0.02%
• Meta: -7% (about $124 billion in market value lost); Q3 capex $34.91 billion; negative free cash flow of $2.12 billion
• Biggest chip losers: Lam Research -11.8%, KLA -9.5%, Marvell -8.7%, Intel -8.04% to $85.49, Nvidia -4.4%
• 10-year Treasury yield fell below 5%; Brent crude topped $112 and hit a five-month peak near $114
• Asia Friday: Kospi opened -2.36%, Nikkei -1.3%, Samsung Electronics down more than 5% early

Sources: Investor's Business Daily, The Wall Street Journal, Reuters, Korea JoongAng Daily, AIStockWire

What's Next

The selloff now faces its biggest test next week, when Alphabet, Microsoft and Amazon report earnings. All three are among the largest AI spenders, and their capital expenditure guidance will either calm the funding fears that sparked this rout or deepen them. Intel also reports on October 29, giving the hardest-hit chip name a chance to answer directly. Until then, traders will watch whether Treasury yields keep falling — a sign investors still want safety — and whether Asian and European markets stabilize after Friday's slide. This post reports market news only and is not financial advice.

FAQ

Why did chip stocks fall so much on October 22, 2026?

Meta's earnings showed AI spending growing faster than cash flow — $34.91 billion of capex in one quarter and negative free cash flow — which revived fears that the AI buildout costs more than it currently earns. Chip suppliers, whose valuations depend on that spending continuing, were sold first and hardest.

How much did the semiconductor index fall?

The Philadelphia Semiconductor Index fell 6.7% on Thursday, its biggest one-day percentage drop since June 23. The Nasdaq Composite fell 2.6% and the S&P 500 fell 1.2% in the same session.

Which chip stocks fell the most?

Lam Research led the declines at -11.8%, followed by KLA at -9.5%, Marvell at -8.7%, Applied Materials at -8.2%, and Intel at -8.04%, closing at $85.49. Nvidia fell a smaller 4.4%.

Did the selloff spread outside the United States?

Yes. On Friday, South Korea's Kospi opened down 2.36%, Samsung Electronics fell more than 5% early, Japan's Nikkei dropped 1.3%, and Kioxia fell more than 7% in early trade as the AI selloff went global.