July Tech Stock Shock: 19 Symbols Plunge Over 25% as Semiconductor Index Slides

July has seen 19 leading technology stocks shed more than a quarter of their value, reshaping market dynamics.

Semiconductor Index Under Pressure

The PHLX Semiconductor Index (SOX) fell 1.6% on Friday’s close, translating to an 18.2% decline for the month after doubling in the first half of 2026. This reversal signals a shift from the earlier risk‑on enthusiasm.

Top Decliners

■Sandisk SNDK: -40.4% (July), +471% (YTD), Forward P/E 6.4 (from 13.6)

■Corning GLW: -39.5%, +77%, Forward P/E 40.0 (from 28.2)

■Astera Labs ALAB: -37.1%, +83%, Forward P/E 79.5 (from 70.5)

■Marvell Technology MRVL: -36.7%, +122%, Forward P/E 36.7 (from 24.0)

■Intel INTC: -31.9%, +158%, Forward P/E 66.5 (from 61.2)

Despite the July sell‑off, seven of these names still boast triple‑digit year‑to‑date gains, with Sandisk leading at +471% YTD.

What This Means for Investors

■Forward P/E multiples now sit below the sector average (SOXX: 22.8), indicating that earnings estimates are outpacing share prices.

■High‑flying growth stories such as Micron Technology MU (+197% YTD) are confronting short‑term momentum exhaustion, which could seed liquidity strain.

■Names like Nebius Group NBIS and CoreWeave CRWV lack forward P/E data, highlighting that their profit models remain nascent and warrant caution.

This pullback likely reflects the unwinding of excess optimism in tech, turning previously built‑up liquidity pressure into a reflux. If hedge funds continue to trim their net sector exposure and short‑term profit‑taking intensifies, Q3 volatility may rise further. A sustainable turnaround will hinge on a return to fundamentals and the materialization of earnings upgrades; otherwise, the downturn could extend into a broader correction.