Biggest Stock Movers Today
S&P 500 and NASDAQ 100 top gainers and losers at the Friday, October 30, 2026 close
On Friday, October 30, 2026, the biggest gainer among S&P 500 and NASDAQ 100 stocks was Regeneron Pharmaceuticals, Inc. (REGN), up 13.33% to $927.89. The biggest loser was Reddit, Inc. (RDDT), down 29.22% to $91.73. Of the 499 stocks with a closing price that day, 219 rose and 280 fell. Over the last five trading days, Pentair plc (PNR) gained the most (+19.82%) and Reddit, Inc. (RDDT) lost the most (-36.41%).
Top 10 Gainers on October 30
| # | Ticker | Company | Day Change | Close | Volume vs 20-Day Avg | Sector | Index |
|---|---|---|---|---|---|---|---|
| 1 | REGN | Regeneron Pharmaceuticals, Inc. | +13.33% | $927.89 | 4.5x | Healthcare | S&P 500 / NASDAQ 100 |
| 2 | GPN | Global Payments, Inc. | +12.97% | $96.84 | 8.7x | Industrials | S&P 500 |
| 3 | GDDY | GoDaddy Inc | +10.72% | $117.24 | 2.3x | Technology | S&P 500 |
| 4 | CSGP | CoStar Group, Inc. | +7.21% | $30.17 | 1.5x | Real Estate | S&P 500 |
| 5 | CBOE | Cboe Global Markets, Inc. | +6.77% | $335.53 | 2.0x | Financial Services | S&P 500 |
| 6 | VLTO | Veralto Corporation | +6.77% | $111.10 | 2.4x | Industrials | S&P 500 |
| 7 | TMUS | T-Mobile US, Inc. | +6.21% | $156.44 | 1.7x | Communication Services | S&P 500 / NASDAQ 100 |
| 8 | TYL | Tyler Technologies, Inc. | +5.45% | $394.30 | 1.8x | Technology | S&P 500 |
| 9 | LYB | LyondellBasell Industries N.V. Class A | +5.00% | $68.64 | 1.4x | Basic Materials | S&P 500 |
| 10 | ACN | Accenture PLC | +4.46% | $258.24 | 1.5x | Technology | S&P 500 |
Top 10 Losers on October 30
| # | Ticker | Company | Day Change | Close | Volume vs 20-Day Avg | Sector | Index |
|---|---|---|---|---|---|---|---|
| 1 | RDDT | Reddit, Inc. | -29.22% | $91.73 | 6.7x | Communication Services | S&P 500 |
| 2 | INTC | Intel Corporation | -28.58% | $65.76 | 4.6x | Technology | S&P 500 / NASDAQ 100 |
| 3 | ILMN | Illumina, Inc. | -18.64% | $235.99 | 2.3x | Healthcare | S&P 500 |
| 4 | TWLO | Twilio Inc. | -15.24% | $205.03 | 1.7x | Technology | S&P 500 |
| 5 | DDOG | Datadog, Inc. | -11.50% | $235.27 | 2.2x | Technology | S&P 500 / NASDAQ 100 |
| 6 | COHR | Coherent Corp. | -11.34% | $210.32 | 1.6x | Technology | S&P 500 |
| 7 | QCOM | QUALCOMM Incorporated | -11.12% | $164.79 | 2.4x | Technology | S&P 500 / NASDAQ 100 |
| 8 | ALAB | Astera Labs, Inc. | -10.93% | $258.70 | 1.8x | Technology | NASDAQ 100 |
| 9 | AMD | Advanced Micro Devices, Inc. | -10.88% | $504.80 | 2.0x | Technology | S&P 500 / NASDAQ 100 |
| 10 | DELL | Dell Technologies Inc. | -10.77% | $424.30 | 1.7x | Technology | S&P 500 |
Top 10 Gainers, Last 5 Trading Days (Oct 26 to Oct 30)
| # | Ticker | Company | 5-Day Change | Close | Volume vs 20-Day Avg | Sector | Index |
|---|---|---|---|---|---|---|---|
| 1 | PNR | Pentair plc | +19.82% | $66.26 | 1.5x | Industrials | S&P 500 |
| 2 | VRT | Vertiv Holdings Co | +19.65% | $232.50 | 1.1x | Industrials | S&P 500 |
| 3 | GEN | Gen Digital Inc. | +17.08% | $29.13 | 1.1x | Technology | S&P 500 |
| 4 | GPN | Global Payments, Inc. | +16.93% | $96.84 | 8.7x | Industrials | S&P 500 |
| 5 | NCLH | Norwegian Cruise Line Holdings Ltd. | +16.36% | $17.57 | 1.3x | Consumer Cyclical | S&P 500 |
| 6 | CMG | Chipotle Mexican Grill, Inc. | +15.88% | $31.89 | 1.0x | Consumer Cyclical | S&P 500 |
| 7 | HII | Huntington Ingalls Industries, Inc. | +15.62% | $316.88 | 1.3x | Industrials | S&P 500 |
| 8 | REGN | Regeneron Pharmaceuticals, Inc. | +15.26% | $927.89 | 4.5x | Healthcare | S&P 500 / NASDAQ 100 |
| 9 | GM | General Motors Company | +15.12% | $87.40 | 1.4x | Consumer Cyclical | S&P 500 |
| 10 | PWR | Quanta Services, Inc. | +13.60% | $620.73 | 1.2x | Industrials | S&P 500 |
Top 10 Losers, Last 5 Trading Days (Oct 26 to Oct 30)
| # | Ticker | Company | 5-Day Change | Close | Volume vs 20-Day Avg | Sector | Index |
|---|---|---|---|---|---|---|---|
| 1 | RDDT | Reddit, Inc. | -36.41% | $91.73 | 6.7x | Communication Services | S&P 500 |
| 2 | NOW | SERVICENOW, INC. | -33.87% | $105.12 | 2.2x | Technology | S&P 500 |
| 3 | ALNY | Alnylam Pharmaceuticals, Inc. | -26.35% | $165.00 | 3.7x | Healthcare | NASDAQ 100 |
| 4 | FFIV | F5, Inc. | -25.71% | $338.34 | 3.1x | Technology | S&P 500 |
| 5 | FTNT | Fortinet, Inc. | -24.40% | $136.08 | 1.8x | Technology | S&P 500 / NASDAQ 100 |
| 6 | INTC | Intel Corporation | -24.38% | $65.76 | 4.6x | Technology | S&P 500 / NASDAQ 100 |
| 7 | TWLO | Twilio Inc. | -21.68% | $205.03 | 1.7x | Technology | S&P 500 |
| 8 | XYL | Xylem Inc | -15.03% | $92.40 | 1.0x | Industrials | S&P 500 |
| 9 | HPQ | HP Inc. | -14.45% | $28.78 | 2.6x | Technology | S&P 500 |
| 10 | MRVL | Marvell Technology, Inc. | -14.05% | $196.40 | 2.0x | Technology | S&P 500 / NASDAQ 100 |
This page ranks every current S&P 500 and NASDAQ 100 member by its price change at the close: the day’s change against
the previous close, and the 5-day change against the close five trading days earlier. Prices are split-adjusted daily closes
from Yahoo Finance. It updates after the market closes each trading day.
Volume vs 20-Day Avg compares the day’s trading volume with the average of the previous 20 trading days.
A big move on 2x or 3x normal volume usually has news behind it; a big move on normal volume is often drift.
A * marks a move over 40%, which is worth checking for a split or spin-off before reading it as a crash or a rally.
Click any ticker for that stock’s full report. Each week we pick one of these movers and explain what actually happened.