S&P 500 top gainers and losers: September 18, 2026
In the Friday, September 18, 2026 session (closing bell at 4:00 p.m. New York time (22:00 in Madrid)), 156 of the 503 S&P 500 stocks with a quote rose and 346 fell; 1 closed unchanged. The median move was −0.63% and the equal-weighted average −0.45%. SPY, the fund that tracks the cap-weighted S&P 500, fell 0.12%.
Latest closed session: Friday, September 18, 2026. Closing prices, not live quotes; the page updates every night after the Wall Street close.
The top gainer was Coinbase Global (COIN, +11.66%); the biggest loser, Nucor (NUE, −6.32%). None of the 40 names in the two tables had just reported earnings, and 48 index stocks moved 3% or more either way. By sector, the best was Industrials (median +0.04%, 39 of 76 up) and the worst Utilities (−1.34%, 31 of 31 down).
The 20 biggest S&P 500 gainers
| # | Company | Chg. / close | Rel. vol. |
|---|---|---|---|
| 1 | COIN Coinbase GlobalInsiders 30d: 3 sales | +11.66%$194.25 | ×2.0 |
| 2 | SNDK SandiskInsiders 30d: 6 sales | +10.99%$1,791.82 | ×1.7 |
| 3 | HOOD Robinhood MarketsInsiders 30d: 5 sales | +9.12%$119.82 | ×1.6 |
| 4 | COHR CoherentInsiders 30d: 7 sales | +7.22%$317.36 | ×1.7 |
| 5 | LRCX Lam ResearchInsiders 30d: 4 sales | +6.98%$288.11 | ×2.5 |
| 6 | STX Seagate TechnologyInsiders 30d: 24 sales | +6.93%$858.79 | ×2.0 |
| 7 | AMAT Applied MaterialsInsiders 30d: 2 sales | +6.51%$444.57 | ×2.3 |
| 8 | TER TeradyneInsiders 30d: 4 sales | +5.19%$371.47 | ×1.8 |
| 9 | FIX Comfort Systems USAInsiders 30d: 1 sale | +4.92%$1,651.37 | ×2.5 |
| 10 | KLAC KLAInsiders 30d: 1 sale | +4.74%$176.99 | ×2.3 |
| 11 | LITE LumentumInsiders 30d: 26 sales | +4.17%$930.91 | ×2.2 |
| 12 | WDC Western DigitalInsiders 30d: 8 sales | +4.13%$441.36 | ×2.3 |
| 13 | MPWR Monolithic Power SystemsInsiders 30d: 2 sales | +4.12%$1,217.80 | ×2.4 |
| 14 | MU Micron TechnologyInsiders 30d: 1 sale | +3.92%$1,015.80 | ×1.5 |
| 15 | ETN Eaton | +3.74%$424.77 | ×2.4 |
| 16 | ADI Analog DevicesInsiders 30d: 6 sales | +3.60%$375.72 | ×2.3 |
| 17 | MCHP Microchip TechnologyInsiders 30d: 1 sale | +3.46%$73.27 | ×2.1 |
| 18 | TXN Texas InstrumentsInsiders 30d: 1 sale | +3.29%$266.64 | ×3.6 |
| 19 | PWR Quanta Services | +3.27%$636.71 | ×1.4 |
| 20 | VRT VertivInsiders 30d: 1 sale | +3.27%$249.39 | ×1.5 |
The 20 biggest losers
| # | Company | Chg. / close | Rel. vol. |
|---|---|---|---|
| 1 | NUE Nucor | −6.32%$248.38 | ×2.6 |
| 2 | QCOM QUALCOMMInsiders 30d: 3 sales | −5.82%$177.72 | ×4.6 |
| 3 | ARE Alexandria Real Estate EquitiesInsiders 30d: 1 buy, 2 sales | −5.40%$53.30 | ×2.1 |
| 4 | GM General Motors | −5.10%$82.20 | ×3.4 |
| 5 | ACN Accenture | −4.73%$181.29 | ×2.6 |
| 6 | NFLX NetflixInsiders 30d: 3 sales | −4.67%$71.79 | ×4.3 |
| 7 | CF CF Industries | −4.57%$127.70 | ×1.8 |
| 8 | FISV Fiserv | −4.28%$47.19 | ×1.8 |
| 9 | APP AppLovin | −4.21%$308.06 | ×2.4 |
| 10 | STLD Steel Dynamics | −4.11%$235.26 | ×2.8 |
| 11 | LEN Lennar | −4.10%$76.43 | ×3.5 |
| 12 | GEN Gen DigitalInsiders 30d: 5 sales | −3.97%$29.01 | ×3.3 |
| 13 | TAP Molson Coors Beverage | −3.97%$37.53 | ×17.5 |
| 14 | CHTR Charter Communications | −3.90%$128.17 | ×2.5 |
| 15 | PSKY Paramount Skydance | −3.86%$10.21 | ×6.7 |
| 16 | LYB LyondellBasell Industries | −3.61%$61.93 | ×2.3 |
| 17 | ALB Albemarle | −3.60%$110.91 | ×2.1 |
| 18 | MOS MosaicInsiders 30d: 1 sale | −3.58%$24.48 | ×1.4 |
| 19 | DELL Dell TechnologiesInsiders 30d: 51 sales | −3.46%$568.06 | ×1.2 |
| 20 | IBM International Business MachinesInsiders 30d: 1 sale | −3.45%$229.55 | ×2.7 |
Change: from the September 17, 2026 close to the September 18, 2026 close, split-adjusted, excluding dividends. Rel. vol.: the session's volume divided by the average of the previous 20 ("×1" is normal; "—" if there is not enough history). "Earnings": the SEC filing (8-K) this session reflects, before the open or the evening before; if the 8-K has not been processed yet, the date announced in Nasdaq's calendar. "After this close": it reported after the session, so its change does not reflect it yet. "Insiders 30d": open-market buys and sales filed on Form 4 (Aug 19, 2026 to Sep 18, 2026), excluding grants and option exercises.
Sectors in the session
| Sector | Stocks | Up / down | Median |
|---|---|---|---|
| Industrials | 76 | 39 / 37 | +0.04% |
| Financial Services | 70 | 33 / 36 | −0.08% |
| Energy | 21 | 9 / 12 | −0.39% |
| Technology | 85 | 33 / 52 | −0.46% |
| Healthcare | 59 | 16 / 43 | −0.48% |
| Real Estate | 30 | 3 / 27 | −0.92% |
| Consumer Defensive | 33 | 6 / 27 | −0.93% |
| Basic Materials | 20 | 3 / 17 | −1.05% |
| Consumer Cyclical | 54 | 10 / 44 | −1.22% |
| Communication Services | 24 | 4 / 20 | −1.31% |
| Utilities | 31 | 0 / 31 | −1.34% |
Sorted by the median change of their stocks: the company in the middle, which one or two huge moves cannot drag. Each sector links to its page, with all its companies.
How to read a day's gainers and losers
A single day is mostly noise. A large stock moving one or two points in a session is normal and rarely reflects company news. These tables start to say something when a move is several times that stock's usual range, and even then one session does not make a trend.
Big moves usually have a cause. Earnings and guidance, an announced deal or merger, analysts changing their view, a regulatory decision or a clinical trial. That is why each row shows whether the company had just reported earnings and whether its insiders bought or sold shares in the last month: two causes that can be checked in public filings, the 8-K and the Form 4 filed with the SEC.
Volume tells you how many were behind it. A move on two or three times the usual volume involved a lot of trading and usually reflects new information; one on normal volume carries less weight and reverses more easily.
The company or its sector? Compare each row with its sector's median in the table above. If the whole sector falls, the cause is usually shared (interest rates, commodities, regulation); if one company falls while its sector rises, the news is its own.
The index is not the typical stock. The S&P 500 weights each company by market value, so a handful of giants can lift it while most of its stocks fall. That is why, besides SPY, this page shows how many rose, how many fell and the median.
Moves that are not news. On the day a stock starts trading without its dividend, its price drops by roughly the amount paid, and the changes here are price-only, without dividends. Splits are adjusted, and a huge jump that cannot be confirmed by a second source is not published, because it may be a data error.
What this page does not say. A big gain is not a signal to buy, nor a big loss a signal to sell. Academic research has documented both very short-term reversals and continuation over several months, but those are average effects measured over thousands of stocks and many years, not predictions for a given stock tomorrow.
Informational page: it reports what already happened in the market and is not a recommendation to buy or sell any security. It takes no one's situation, horizon or risk into account.
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The 11 S&P 500 sectors →
Sources: daily closes from the market-data provider (Yahoo Finance), split-adjusted; sector classification from the same provider (similar to but not the same as GICS); earnings announcements from SEC 8-K filings (EDGAR) and Nasdaq's public calendar; SEC Form 4. Closed sessions only: this page does not use live quotes. Information, not investment advice.