S&P 500 Movers | Winners: TRV, STX, CNC | Losers: ISRG, CDNS, SNPS
The day’s market action was defined by sharp divergences, but the real story lies in which moves have staying power.
The S&P 500 returned -1.0% on a day that saw declines across major indexes, with the Dow Jones Industrial Average returning -0.8% and the Nasdaq-100 -1.5%. The session’s most severe move was in Intuitive Surgical (ISRG), which returned -14.1%. This raises a critical question for any observer of daily market action: how much of a single day’s drama is noise, and how much is signal? The day’s biggest winners and losers are a starting point for that inquiry.
Friday’s S&P 500 Winners
The 10 stocks with the highest returns on the last trading day:
| # | Ticker | Company Name | 1-D Returns |
YTD Returns |
|---|---|---|---|---|
| 1 | TRV | Travelers Companies | 9.2% | 28.2% |
| 2 | STX | Seagate Technology | 5.7% | 186.7% |
| 3 | CNC | Centene | 4.0% | 61.5% |
| 4 | CASY | Casey’s General Stores | 3.9% | 55.7% |
| 5 | LITE | Lumentum | 3.8% | 98.8% |
| 6 | HUM | Humana | 3.5% | 57.3% |
| 7 | ADM | Archer-Daniels-Midland | 3.5% | 51.5% |
| 8 | ALL | Allstate | 3.3% | 21.3% |
| 9 | AIG | American International | 3.2% | -4.7% |
| 10 | VLO | Valero Energy | 3.1% | 92.3% |
Friday’s S&P 500 Losers
And the 10 stocks with the lowest returns:
| # | Ticker | Company Name | 1-D Returns |
YTD Returns |
|---|---|---|---|---|
| 1 | ISRG | Intuitive Surgical | -14.1% | -39.0% |
| 2 | CDNS | Cadence Design Systems | -9.5% | 5.6% |
| 3 | SNPS | Synopsys | -7.9% | -18.2% |
| 4 | NFLX | Netflix | -7.3% | -26.5% |
| 5 | AXON | Axon Enterprise | -5.8% | -10.2% |
| 6 | HOOD | Robinhood Markets | -5.7% | -11.6% |
| 7 | AMAT | Applied Materials | -5.6% | 106.6% |
| 8 | BLDR | Builders FirstSource | -5.0% | -27.8% |
| 9 | PNR | Pentair | -4.9% | -39.7% |
| 10 | CVNA | Carvana | -4.7% | -20.2% |
Some daily strength has deeper roots.
While a single day’s leaderboard can be random, persistence is worth noting. Travelers Companies (TRV) was the day’s strongest stock, returning +9.2%, but this follows a longer trend. The stock also appears on the one-month winners list with a one-month return of +20.0%. Valero Energy (VLO) shows a similar pattern, with a one-month return of +26.8%. These are not one-day events. In contrast, the day’s weakest performer, Intuitive Surgical (ISRG), trades at 41.1 times trailing earnings, while top gainer TRV trades at 9.4 times.
Movers Over The Last Week
Widening the window to five trading days, these are the strongest and weakest S&P 500 names:
| # | Ticker | Company Name | 1-W Returns |
YTD Returns |
|---|---|---|---|---|
| 1 | PYPL | PayPal | 22.1% | -2.5% |
| 2 | CTAS | Cintas | 13.8% | 9.3% |
| 3 | VLO | Valero Energy | 10.3% | 92.3% |
| 4 | MPC | Marathon Petroleum | 10.2% | 93.9% |
| 5 | PANW | Palo Alto Networks | 10.1% | 94.7% |
| 6 | PSX | Phillips 66 | 9.8% | 62.8% |
| 7 | TRV | Travelers Companies | 8.9% | 28.2% |
| 8 | CRWD | CrowdStrike | 8.5% | 73.3% |
| 9 | VRSK | Verisk Analytics | 8.2% | -9.8% |
| 10 | ABT | Abbott Laboratories | 8.0% | -18.1% |
| # | Ticker | Company Name | 1-W Returns |
YTD Returns |
|---|---|---|---|---|
| 1 | SNDK | SanDisk | -29.3% | 470.7% |
| 2 | IBM | International Business Machines | -26.0% | -27.3% |
| 3 | MRVL | Marvell Technology | -20.0% | 122.4% |
| 4 | GLW | Corning | -19.0% | 77.2% |
| 5 | CIEN | Ciena | -18.7% | 60.1% |
| 6 | WDC | Western Digital | -18.1% | 177.2% |
| 7 | PNR | Pentair | -18.0% | -39.7% |
| 8 | APP | AppLovin | -16.3% | -37.0% |
| 9 | ISRG | Intuitive Surgical | -15.1% | -39.0% |
| 10 | SMCI | Super Micro Computer | -14.6% | -17.4% |
Movers Over The Last Month
And over the last 21 trading days:
| # | Ticker | Company Name | 1-M Returns |
YTD Returns |
|---|---|---|---|---|
| 1 | PYPL | PayPal | 29.6% | -2.5% |
| 2 | TECH | Bio-Techne | 28.7% | 23.0% |
| 3 | PANW | Palo Alto Networks | 28.1% | 94.7% |
| 4 | VLO | Valero Energy | 26.8% | 92.3% |
| 5 | MPC | Marathon Petroleum | 24.8% | 93.9% |
| 6 | CRL | Charles River Laboratories International | 21.4% | 12.5% |
| 7 | PSX | Phillips 66 | 20.3% | 62.8% |
| 8 | TRV | Travelers Companies | 20.0% | 28.2% |
| 9 | GDDY | GoDaddy | 19.7% | -24.0% |
| 10 | VEEV | Veeva Systems | 19.6% | -12.5% |
| # | Ticker | Company Name | 1-M Returns |
YTD Returns |
|---|---|---|---|---|
| 1 | ORCL | Oracle | -32.6% | -34.5% |
| 2 | MRVL | Marvell Technology | -32.3% | 122.4% |
| 3 | SNDK | SanDisk | -32.0% | 470.7% |
| 4 | WDC | Western Digital | -29.9% | 177.2% |
| 5 | COHR | Coherent | -27.5% | 50.4% |
| 6 | ALB | Albemarle | -27.3% | -14.2% |
| 7 | ON | ON Semiconductor | -26.1% | 61.3% |
| 8 | ECHO | EchoStar | -23.9% | -15.4% |
| 9 | STX | Seagate Technology | -23.6% | 186.7% |
| 10 | IBM | International Business Machines | -21.5% | -27.3% |
A large move is a signal to start research, not end it.
The tables presented earlier are best used as a map of market attention and volatility, not a set of instructions. A stock returning -14.1% in a single session, or another gaining +9.2%, is clearly undergoing a re-evaluation by market participants. The disciplined next step is not to react, but to investigate the fundamentals of the business behind the ticker. A movers list flags a name; the work of understanding why begins after.
The next step is never to trade the list; it is to test it. Our Guidance Momentum screen shows which risers have management raising guidance behind them, and our Buy the Dip screen shows which of the fallers still generate the growth and cash that make a recovery plausible.
Every Stock On That List Moved That Much In One Session
The movers list is a daily reminder that the same volatility fills both columns, and nobody knows which side their name lands on next. How much damage any single position could do to your net worth is a question with a precise answer. The Trefis Wealth team computes it for investors professionally, with the same rules-based systematic discipline that runs our High Quality Portfolio. Request a free vulnerability audit of your biggest positions.