Best stock of the week: Fair Isaac (FICO) +15.52%, plus the biggest losers (October 16, 2026)
The S&P 500 slipped 1.95% this week, with the Nasdaq down 4.48% and the Russell 2000 off 3.05%, while the Dow edged up 0.67%. Energy and defense names led weekly gains, while technology and communication services stocks saw the steepest declines.
| Ticker | Company | Price ($) | Week | Last day | Avg. daily volume |
|---|---|---|---|---|---|
| FICO | Fair Isaac | 771.19 | +15.52% | +0.16% | $789M |
| CTSH | Cognizant | 66.03 | +11.54% | +0.40% | $371M |
| EFX | Equifax | 161.25 | +10.61% | -0.01% | $277M |
| BRO | Brown & Brown | 69.40 | +10.37% | +2.09% | $133M |
| ACN | Accenture | 229.68 | +9.86% | +2.12% | $1.6B |
| AJG | Arthur J. Gallagher | 254.88 | +9.53% | +1.91% | $291M |
| TYL | Tyler Technologies | 360.87 | +9.50% | -0.76% | $225M |
| DRI | Darden Restaurants | 216.35 | +9.46% | +0.95% | $225M |
| BF.B | Brown–Forman | 28.88 | +9.44% | +1.05% | $106M |
| COP | ConocoPhillips | 146.51 | +9.25% | +3.37% | $924M |
| Ticker | Company | Price ($) | Week | Last day | Avg. daily volume |
|---|---|---|---|---|---|
| CIEN | Ciena | 332.73 | -26.02% | -6.67% | $1.2B |
| COHR | Coherent | 232.90 | -25.50% | -7.06% | $2.0B |
| LITE | Lumentum | 824.13 | -25.31% | -5.22% | $5.1B |
| HPE | Hewlett Packard Enterprise | 55.13 | -24.95% | -5.97% | $1.7B |
| SKYD | Skydance | 6.91 | -24.56% | -4.82% | $347M |
| FLEX | Flex | 90.46 | -24.51% | -8.16% | $574M |
| SMCI | Supermicro | 31.63 | -24.44% | -9.86% | $1.2B |
| DELL | Dell Technologies | 451.71 | -22.92% | -4.58% | $4.7B |
| BE | Bloom Energy | 221.31 | -21.10% | -6.34% | $3.7B |
| P | Everpure | 124.01 | -19.73% | -7.04% | $664M |
| Market | Last | Change | Week to date |
|---|---|---|---|
| S&P 500 | 7,659.44 | -1.09% | -1.95% |
| Nasdaq | 26,140.03 | -2.15% | -4.48% |
| Dow Jones | 52,002.41 | -0.34% | +0.67% |
| Russell 2000 | 2,721.37 | -1.66% | -3.05% |
| VIX | 19.99 | +21.45% | - |
| 10-year yield (%) | 5.10 | +0.18% | - |
| US Dollar Index | 101.78 | -0.22% | - |
| Gold ($/oz) | 4,187.50 | +0.42% | - |
| WTI crude ($) | 98.92 | +0.97% | - |
| Bitcoin ($) | 81,561.39 | -0.71% | - |
What were the best-performing S&P 500 stocks this week?
Fair Isaac led the week with a 15.52% gain, followed by Cognizant at 11.54% and Equifax at 10.61%. Other top performers included Brown & Brown, Accenture, and Arthur J. Gallagher, each up more than 9.5%.
Fair Isaac (FICO) rose 15.52% for the week ended October 16, 2026, the largest gain among S&P 500 constituents. Cognizant (CTSH) added 11.54%, and Equifax (EFX) gained 10.61%.
Brown & Brown (BRO) advanced 10.37%, while Accenture (ACN) and Arthur J. Gallagher (AJG) climbed 9.86% and 9.53%, respectively. Tyler Technologies (TYL) and Darden Restaurants (DRI) each rose more than 9.4%.
The reasons for these moves are not in our data. Readers can check company SEC filings and press releases for details.
Which S&P 500 stocks fell the most this week?
Ciena posted the largest weekly decline, down 26.02%, followed by Coherent at -25.50% and Lumentum at -25.31%. Hewlett Packard Enterprise and Skydance also fell more than 24%.
Ciena (CIEN) dropped 26.02% for the week, the worst performance in the S&P 500. Coherent (COHR) lost 25.50%, and Lumentum (LITE) fell 25.31%.
Hewlett Packard Enterprise (HPE) declined 24.95%, and Skydance (SKYD) slid 24.56%. Flex (FLEX) and Supermicro (SMCI) each lost more than 24.4%.
No specific causes for these declines are included in our data. Investors should consult company filings and press releases for more information.
How did the major indices perform this week?
The S&P 500 fell 1.95% for the week, the Nasdaq dropped 4.48%, and the Russell 2000 declined 3.05%. The Dow Jones Industrial Average was the outlier, gaining 0.67%.
For the week ending October 16, 2026, the S&P 500 stood at 7,659.44, down 1.95% week-to-date. The Nasdaq Composite was at 26,140.03, down 4.48% for the week.
The Dow Jones Industrial Average closed at 52,002.41, up 0.67% for the week. The Russell 2000 finished at 2,721.37, down 3.05%.
Market breadth was nearly balanced on Friday, with 246 advancers and 248 decliners among S&P 500 constituents. The VIX rose 21.45% on the day to 19.99.
What other market indicators moved this week?
The 10-year Treasury yield was 5.098%, the US Dollar Index stood at 101.778, and WTI crude rose to $98.92. Gold was at $4,187.50 per ounce, and Bitcoin traded at $81,561.39.
The 10-year Treasury yield (TNX) was 5.098% on Friday, up 0.18% for the day. The US Dollar Index (DXY) was at 101.778, down 0.22%.
WTI crude oil settled at $98.92 per barrel, up 0.97% on the day. Gold was quoted at $4,187.50 per ounce, up 0.42%.
Bitcoin traded at $81,561.39, down 0.71% on the day. These figures are as of the latest available data and may have changed since.
Frequently asked questions
What was the S&P 500's weekly performance?
The S&P 500 fell 1.95% for the week ending October 16, 2026, closing at 7,659.44.
Which stock had the biggest weekly gain in the S&P 500?
Fair Isaac (FICO) was the top weekly gainer, rising 15.52%.
Which stock had the biggest weekly loss in the S&P 500?
Ciena (CIEN) was the worst weekly performer, falling 26.02%.
Bottom line
The S&P 500 ended the week lower, with technology and communication services stocks leading declines, while energy and defense names posted gains. The Dow was the only major index to finish higher. Past performance does not guarantee future results. Live tables are updated during the session on our stock market page.