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CSGP +7.0%: an unusually large move for this stock. COSTAR GROUP, INC. moved 6.4 points more than its sector, on 0.6× its usual volume.

2026-10-08 · CSGP

CSGP +7.0%: an unusually large move for this stock

COSTAR GROUP, INC. moved 6.4 points more than its sector, on 0.6× its usual volume.

The story in plain words

Thursday, October 8, 2026. CSGP +7.0%: an unusually large move for this stock. COSTAR GROUP, INC. moved 6.4 points more than its sector, on 0.6× its usual volume.

What the data shows for CoStar Group (CSGP): CSGP +7.0% today. Its sector fund (XLRE) +0.7% today. S&P 500 (SPY) −0.6% today.

Worked out from that data: 6.4 points more than its sector. Volume 0.6× its 20-day average. Bigger than 98% of its daily moves over the past 250 trading days. After the 10 most similar CSGP days since Oct 20, 2021, the stock was higher 5 days later 7 of 10 times (History, not a forecast).

Possible contributors. These line up in time with the move; they are not confirmed causes: News: “Stay informed with the top movers within the S&P500 index on Thursday.” (Published around the move. Timing only, not a confirmed cause). News: “1 of Wall Street’s Favorite Stocks with Solid Fundamentals and 2 We Avoid” (Published around the move. Timing only, not a confirmed cause).

About the company: CoStar Group trades as CSGP and is part of the S&P 500, in the Real Estate sector (Real Estate Services), headquartered in Washington, D.C., founded in 1987.

This is one of CookieStocks’ daily stock stories about unusually large one-day price moves in S&P 500 stocks, measured against each stock’s own history, its sector and its usual volume. Stories are found automatically each trading day from market data and SEC filings, and every claim is labelled as observed, calculated or a possible contributor. Statistics only, not investment advice.

Prove it

Every claim on the graphic, labelled: observed (straight from the data), calculated (worked out from it), or possible contributor (lines up in time, not a confirmed cause).

  • OBSERVED
    CSGP +7.0% todayOct 8, 2026, 3:35 PM ET
  • OBSERVED
    Its sector fund (XLRE) +0.7% todayOct 8, 2026, 3:35 PM ET
  • CALCULATED
    6.4 points more than its sectorHow: stock return − sector fund return · Oct 8, 2026, 3:35 PM ET
  • OBSERVED
    S&P 500 (SPY) −0.6% todayOct 8, 2026, 3:35 PM ET
  • CALCULATED
    Volume 0.6× its 20-day averageHow: today’s volume ÷ average of the last 20 days · Oct 8, 2026, 3:35 PM ET
  • CALCULATED
    Bigger than 98% of its daily moves over the past 250 trading daysHow: share of past daily moves smaller in size · Oct 8, 2026, 3:35 PM ET
  • POSSIBLE CONTRIBUTOR
    News: “Stay informed with the top movers within the S&P500 index on Thursday.”Published around the move. Timing only, not a confirmed cause. · Oct 8, 2026, 12:35 PM ET
  • POSSIBLE CONTRIBUTOR
    News: “1 of Wall Street’s Favorite Stocks with Solid Fundamentals and 2 We Avoid”Published around the move. Timing only, not a confirmed cause. · Oct 8, 2026, 8:32 AM ET
  • CALCULATED
    After the 10 most similar CSGP days since Oct 20, 2021, the stock was higher 5 days later 7 of 10 timesHistory, not a forecast. · How: same-company days with a move of similar size and direction

CoStar Group (CSGP) financials and filings →

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Statistics only, not investment advice. Past moves don’t predict future ones. Data as of Oct 8, 2026, 3:35 PM ET.