Why It Moved · Market · 2026-10-14
Why it moved, October 13: Applied Materials -7%, Johnson & Johnson -6%, CDW +6%
On Tuesday, October 13 the S&P 500 fell 0.0% and 266 of 501 member stocks finished higher. These were the five biggest moves among S&P 500 stocks, and what was behind them.
The biggest S&P 500 moves, October 13
| Company | Move | vs usual day | Volume vs 20-day avg | Year to date | Where it stands |
|---|
| Applied Materials (AMAT) | -6.7% | 2.4x | 1.8x | +81.3% | 36% below its 52-week high; above its 200-day average, below its 50-day |
| Johnson & Johnson (JNJ) | -5.7% | 6.1x | 2.4x | +22.1% | 11% below its 52-week high; above its 200-day average, below its 50-day |
| CDW (CDW) | +5.7% | 3.0x | 1.8x | +13.3% | 3% below its 52-week high; above its 50- and 200-day averages |
| Citigroup (C) | -5.6% | 4.0x | 2.1x | +8.3% | 14% below its 52-week high; below its 50- and 200-day averages |
| Flex Ltd. (FLEX) | -5.4% | 1.8x | 1.8x | +83.5% | 32% below its 52-week high; above its 200-day average, below its 50-day |
"vs usual day" compares the move with the stock's average daily move (up or down) over the past year. Stocks with a one-day change over 60% (usually a spin-off or split) are left out.
What this means
- Applied Materials (AMAT) fell 6.7% as Yahoo Finance UK reported “Applied Materials Stocks Fall 5.7% Although Evercore Backs Its EPIC Strategy”1. That was about 2 times its usual daily move of 2.8%, on 1.8 times its average trading volume. The median Information Technology stock moved -0.2%. It now sits 36% below its 52-week high; above its 200-day average, below its 50-day.
- Johnson & Johnson (JNJ) fell 5.7% despite a raised outlook2. That was about 6 times its usual daily move of 0.9%, on 2.4 times its average trading volume, options had priced a move of about ±2%. The median Health Care stock moved -0.3%. It now sits 11% below its 52-week high; above its 200-day average, below its 50-day.
- CDW (CDW) rose 5.7%. That was about 3 times its usual daily move of 1.9%, on 1.8 times its average trading volume. The median Information Technology stock moved -0.2%. It now sits 3% below its 52-week high; above its 50- and 200-day averages.
- Citigroup (C) fell 5.6% around its quarterly earnings report. That was about 4 times its usual daily move of 1.4%, on 2.1 times its average trading volume, options had priced a move of about ±3%. The median Financials stock moved -0.4%. It now sits 14% below its 52-week high; below its 50- and 200-day averages.
- Flex Ltd. (FLEX) fell 5.4%. That was against a usual daily move of 3.0%, on 1.8 times its average trading volume. The median Information Technology stock moved -0.2%. It now sits 32% below its 52-week high; above its 200-day average, below its 50-day.
- A big one-day move tells you what the market learned that day, not where the stock goes next: large moves partly reverse about as often as they continue.
- Moves on several times normal volume usually reflect new information (results, guidance, a deal) rather than drift.
Sources
- Yahoo Finance UK, Oct 13, 2026: Applied Materials Stocks Fall 5.7% Although Evercore Backs Its EPIC Strategy
- Barron's, Oct 13, 2026: Johnson & Johnson Hikes Earnings Guidance but Pharma Growth Masks a MedTech Stumble. Stock Falls
Did the model see it coming?Subscribers see the model's view on every S&P 500 stock before and after big moves.
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Prices and volume from Torvanta's end-of-day data. News context is drawn from the coverage cited below and may not be the whole cause of a move. Research only, not investment advice or a recommendation to buy or sell any security. Rankings change as data changes and can be wrong. Torvanta and its founder may hold positions in securities discussed. Past performance does not guarantee future results.
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