Apple’s Stock Slides 1.56% as $9.75B Volume Ranks Fifth in Daily Trading Amid Supply Chain Woes and Mixed Earnings

Apple Inc. , 2025, , ranking fifth in market activity for the day. The decline came amid mixed signals from earnings reports and supply chain updates.

Recent reports highlighted potential delays in the production of new iPhone models due to component shortages, raising concerns about holiday season sales performance. Analysts noted that such disruptions could impact near-term revenue forecasts, though long-term demand fundamentals remain stable.

Investor sentiment was further tempered by cautious guidance from key suppliers, which suggested tighter inventory controls might persist into early 2026. These factors contributed to a defensive trading pattern, with institutional investors reducing exposure ahead of quarterly reporting deadlines.

To run a clean, reproducible back-test we need to pin down several practical details. Could you please confirm (or adjust) the following? 1. Universe • U.S. listed common stocks (NYSE + NASDAQ) – yes / no? • If not U.S. equities, which exchange(s)? 2. Ranking & rebalancing rule • “Daily trading volume” = previous day’s dollar volume (shares × close) or share volume? • Rebalance at the next day’s open and hold for one full trading session (open-to-close), then repeat – acceptable? 3. Weighting of the 500 names • Equal-weight each stock at the day’s open – OK? 4. Frictions • Ignore commissions/slippage for this first pass? 5. Output • Core performance metrics (CAGR, annualized vol, max drawdown, Sharpe) plus an equity curve – sufficient? Let me know your preferences and we’ll proceed with the test (or suggest alternatives if our tooling can’t support a particular detail).