KLA Stock Plunges 3.31% as $1.06 Billion Volume Ranks 100th in Market Activity

On October 3, 2025, KLA Corporation (KLAC) closed with a 3.31% decline, trading on a volume of $1.06 billion, ranking 100th in market activity. The stock’s performance followed mixed signals from recent industry dynamics and strategic positioning in semiconductor equipment markets.

Analysts noted heightened volatility in the semiconductor equipment sector amid shifting demand patterns for advanced node manufacturing. KLA’s market positioning as a supplier of process control and yield management solutions faced scrutiny as investors recalibrated expectations for capital expenditure cycles in foundry and logic chip segments. The stock’s technical profile showed elevated short-term resistance levels, contributing to cautious sentiment ahead of key earnings and client order updates.

To build an objective, reproducible back-test we need to pin down a few practical details: Universe—Should we scan all U.S. common stocks (≈4,000 names) each day and pick the 500 with the highest dollar trading volume? Trade timing & pricing—A typical implementation ranks by that day’s volume at the close, buys at the close, and liquidates at the next day’s close (1-day holding period). Weighting & capital allocation—Equal-weight each of the 500 names is standard. Frictional costs—Assume zero commission/slippage for simplicity. If the defaults below are acceptable: Universe=all U.S. common stocks (NYSE + NASDAQ + AMEX), Entry price=same-day close after ranking, Exit price=next-day close, Weighting=equal dollar weight across the 500 picks, No transaction costs. Please confirm adjustments before proceeding.