Semiconductor stocks extended declines this week, with the PHLX Semiconductor Index dropping 5% on Tuesday and a further 2% on Wednesday, erasing roughly 7% of sector value. The index now sits about 20% below its June 22 record, despite no negative news from chip companies.
Analog Devices (NASDAQ:ADI) reported record results and forecast a record fourth quarter, yet its shares fell alongside the broader sector. The selloff followed a surge in long-term borrowing costs, with the 30-year U.S. Treasury yield climbing to 5.33% on Tuesday, its highest level since June 2007.
The semiconductor index fell from 12,621 on Tuesday to 11,738 by Wednesday, with declines spread across memory chips, AI-focused stocks, and industry leaders. Advanced Micro Devices (NASDAQ:AMD) and Micron Technology (NASDAQ:MU) each dropped about 7%, while Nvidia (NASDAQ:NVDA) declined less sharply but still retreated both days.
The bond market rally reflected broader concerns, including a widening U.S. fiscal deficit of $432.3 billion in July and persistent inflation above the Federal Reserve’s 2% target. Rising oil prices compounded investor anxiety, driving demand for longer-duration Treasuries to two-decade highs.
Despite the sector’s 66% gain in 2026 following a 7,083 close at the end of 2025, the recent pullback underscores sensitivity to interest rate movements. Growth stocks with valuations tied to future earnings are particularly vulnerable to rising long-term yields, which reduce the present value of distant cash flows.
