Why is iShares Semiconductor ETF plunging today?

On October 30, 2026, the iShares Semiconductor ETF experienced a significant drop of 8.5%, trading at $470.35. This dramatic decline marked the ETF's steepest intraday drop in recent memory. The major catalyst behind the decline was Intel's disappointing fourth-quarter revenue guidance and Amazon's earnings miss. These earnings reports simultaneously dented investor confidence in both legacy chip demand and the AI spending cycle that had previously fueled the sector's remarkable growth in 2026.

The semiconductor sector's downturn was not limited to Intel but also extended to equipment manufacturers, foundries, and analog suppliers. Broadcom shares fell nearly 5% in morning trading, Advanced Micro Devices plunged nearly 10%, and Micron Technology slipped 4.4%. The fund's large-scale selloff added to the pressure, with SOXX, the ETF's predecessor, having netted a $1.54 billion outflow by selling stocks and not buying any during the day.

The broader market also contributed to the ETF's decline. The Nasdaq dropped 2.6%, the S&P 500 fell 1.6%, and the Dow declined 0.7%. The market sentiment was decidedly risk-averse, reflecting the worry generated by weak big-tech earnings. Furthermore, concerns over valuation, supply capacity, financing costs, and uneven chip demand had been brewing for weeks, culminating in today's earnings-related fallout.

The perfect storm of Intel's guidance shock, Amazon's AI spending scrutiny, and large institutional outflows from SOXX's holdings created an unfavourable environment for semiconductor stocks. The upcoming earnings report from NVIDIA scheduled for mid-November will not provide a near-term catalyst to reverse sentiment, with the fund trading way below its session open of $479.74 and its 52-week high of $655.95.