Chip Index Falls 21.9% From October Peak
The Philadelphia Semiconductor Index closed at 10,328.33 on November 2, down sharply from its October 6 high amid losses across major chipmakers.
Updated on Nov. 3, 2026 in Semiconductors
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The Philadelphia Semiconductor Index closed Monday at 10,328.33, 21.9% below its October 6 close of 13,217.82. Losses among major chipmakers ranged from 11.2% for TSMC to 48.4% for Intel.
Why it matters
The decline reflects a broad selloff across the semiconductor sector, with significant consolidation activity underway as Marvell announced an all-stock deal to acquire Lumentum. The moves come as investors weigh uneven demand across data center, PC and memory markets.
Intel posted third-quarter revenue of $16.5 billion, a 21% year-over-year increase, with revenue, gross margin and earnings per share exceeding company guidance. Marvell's all-stock Lumentum deal carries an implied enterprise value of $115 billion, with Lumentum holders receiving 4.5 Marvell shares per share held.
The players
Intel
Intel is a major U.S. semiconductor manufacturer that has faced sharp stock losses despite reporting third-quarter results above company guidance.
Marvell Technology
Marvell Technology is a U.S. semiconductor company that announced an all-stock deal to acquire Lumentum at an implied enterprise value of $115 billion.
Lumentum
Lumentum is a photonics and optical components company whose shareholders will receive Marvell shares under the proposed acquisition.
TSMC
TSMC, the Taiwan Semiconductor Manufacturing Company, is the world's largest contract chipmaker, whose Taiwan-listed shares fell 11.2% in the period measured.
Kioxia
Kioxia is a Japanese memory chip manufacturer that forecast October-to-December revenue of 2.5 trillion yen.
The details
Marvell shares fell 40.3% from their October 6 high, and Lumentum shares dropped 18.6% on Monday following the acquisition announcement. Kioxia forecast October-to-December revenue of 2.5 trillion yen, citing strong data center demand offset by unfavorable exchange rates.
Timeline
October 5, 2026: Intel reached its recent closing high before its decline.
October 6, 2026: The semiconductor index reached its peak close.
October 29-30, 2026: Marvell shares fell on consecutive sessions.
November 2, 2026: The semiconductor index closed 21.9% below its peak.
November 3, 2026: AMD is scheduled to release third-quarter results after U.S. markets close.
The Tech Race
The Philadelphia Semiconductor Index serves as the main gauge of U.S.-listed chipmaker performance, and its 21.9% drop from the October 6 peak places the current selloff among the sharpest declines in the sector this year. The Marvell-Lumentum deal adds a consolidation dimension as chipmakers pursue scale amid uneven demand across data center and PC markets.
Consumers may see the effects of chip-sector shifts in device pricing and availability over time, though the source does not specify near-term product impacts. Investors holding semiconductor index funds or individual chip stocks have experienced significant paper losses following the recent decline.
The takeaway
Sharp sector-wide drawdowns can coincide with strong company results, underscoring that stock prices and fundamentals may diverge in the short term. Investors tracking the semiconductor sector may find the upcoming AMD earnings release a useful signal of demand conditions.
What happens next
AMD is scheduled to release third-quarter results after U.S. markets close on November 3, 2026, which could shape sentiment across the sector.
Further reading
For broader context on the chip sector, explore more Semiconductors coverage.
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