Apple Shares Dip 0.55% on Third-Highest Trading Volume Amid Tech Sector Uncertainty

On September 26, 2025, Apple Inc. (AAPL) closed with a 0.55% decline, trading at a volume of $11.82 billion—the third-highest on the day. The stock’s movement drew attention amid mixed market sentiment toward tech sector leadership.

Analysts highlighted uncertainty around upcoming earnings reports and shifting consumer spending patterns. Recent supply chain adjustments in key product lines, including the iPhone 16 series, were cited as potential near-term headwinds. However, long-term optimism persists over the company’s AI integration roadmap and expanding services ecosystem.

To run this back-test for you I need to nail down a few practical details: 1. Market universe • Do you want to use all U.S. listed common stocks (NYSE + NASDAQ + AMEX) that are still active today, or a different universe (e.g., only S&P 1500 constituents)? 2. Ranking & execution convention • “Buy the top 500 by daily trading volume” – should the ranking be done on yesterday’s volume and the trade executed at today’s open, or do you prefer buy at today’s close after seeing today’s volume? • Exit price: next-day open, next-day close, or something else? 3. Weighting & transaction costs • Equal-weight each of the 500 names? • Ignore commissions/slippage, or apply a standard cost (e.g., 5 bps per side)? Once we pin these down I’ll retrieve the required data and run the portfolio back-test.