CoStar Group, Inc. (CSGP)
CSGP moved a median of -0.06% 30 minutes after news, and +0.06% by the close. How CSGP actually reacts to news — the realized, point-in-time move the market made, measured across 476 labeled events over the last three years with zero look-ahead.
CSGP’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.06% | 56% | 476 |
| 30-min | -0.06% | 48% | 476 |
| 60-min | 0.00% | 50% | 476 |
| to close | +0.06% | 51% | 473 |
| Middle 50% of CSGP reactions | -0.65% to +0.62% |
|---|---|
| Median reaction (30-min) | -0.06% |
| Measured reactions | 476 |
Half of all CoStar Group, Inc. news events land between -0.65% and +0.62% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How CSGP reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 14 | +0.03% | 71% | -0.30% |
| Analyst downgrades | 19 | +1.02% | 58% | +2.52% |
| Coverage initiations | 25 | -0.01% | 44% | +0.21% |
| Rating reiterations | 161 | -0.05% | 47% | +0.23% |
| Price-target raises | 24 | -0.12% | 38% | +0.00% |
| Price-target cuts | 55 | +0.15% | 56% | +0.44% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. See how CSGP ranks against every other measured name →
That’s how CSGP usually reacts — get an email when it moves on news →Email me when CSGP moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to CSGP's baseline. Nothing else.
Recent CSGP events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| U.S. Office Leasing Volume Lags Historical Norm Despite Recent Recovery | Press release | Business Wire | -0.30% | -1.17% | |
| CoStar Group to Report Financial Results for Third Quarter on October 27, 2026 | Press release | Business Wire | -0.76% | -1.55% | |
| Apartments.com Releases Multifamily Rent Growth Report for September 2026 | Press release | Business Wire | +0.34% | -0.79% | |
| Every Major Commercial Real Estate Brokerage in Canada Subscribes to CoStar | Press release | Business Wire | +0.34% | -0.79% | |
| Oklahoma City, Hartford and Cleveland Among Top Markets in CoStar’s Bulk Logistics Performance Ranking | Press release | Business Wire | -0.37% | +0.48% | |
| Tampa, Columbus Lead CoStar’s Small-Bay Industrial Performance Ranking | Press release | Business Wire | -0.04% | -1.33% | |
| Homes.com Shares Most Expensive Home Sales Across Major U.S. Markets in August | Press release | Business Wire | -0.04% | -1.33% | |
| Homes.com Report: Housing Market Prices Continue Rising Despite More Homes for Sale | Press release | Business Wire | -1.32% | -2.90% | |
| Canada's Industrial Market Recovery Expected to Translate Into Positive Rent Growth by Late 2027 | Press release | Business Wire | +0.79% | -0.75% | |
| CoStar Group Names Felix Kusch President of Homes.com | Press release | Business Wire | -0.90% | +1.64% | |
| Flight to Quality Continues Across Canada’s Office Sector | Press release | Business Wire | +0.83% | +1.12% | |
| New-Construction Buyers Prioritize Space, Financial Confidence and Function, Homes.com Survey Finds | Press release | Business Wire | +0.81% | +2.46% | |
| Canada's Retail Market Is Still Recuperating From the Closure of Hudson's Bay Stores | Press release | Business Wire | -0.77% | -0.46% | |
| OpenAI Features Apartments.com in GPT-6 Astra Apartment-Hunting Demo | Press release | Business Wire | -0.77% | -0.46% | |
| Apartments.com Releases Multifamily Rent Growth Report for August 2026 | Press release | Business Wire | +2.10% | -0.50% | |
| Canada's Multifamily Market Masks Two Distinct Realities | Press release | Business Wire | +0.41% | +0.34% | |
| CoStar Report Shows Data Centers Fueling Increasing Share of U.S. Industrial Demand | Press release | Business Wire | +2.08% | -0.22% | |
| Diamond Properties’ Mark Blanford and Jeff Haack Receive CoStar’s Q2 2026 Power Broker Quarterly Deals Award | Press release | Business Wire | -0.03% | +0.41% | |
| Homes.com Shares Most Expensive Home Sales Across Major U.S. Markets in July | Press release | Business Wire | +0.34% | +1.30% | |
| CoStar Group Completes Acquisition of Zonda, Expanding into New Home Data, Analytics and Online Marketplaces | Press release | Business Wire | -0.95% | -0.71% | |
| Form 8-K COSTAR GROUP, INC. For: Aug 21 | SEC filing · Form 8-K | SEC EDGAR | +0.49% | +1.17% | |
| CoStar Group Names Steve Price President of Ten-X | Press release | Business Wire | -1.28% | -2.03% | |
| Homes.com Report: U.S. Home Prices Rise 2.6% Despite Expanding Inventory as Sales Continue to Grow | Press release | Business Wire | +4.09% | +7.83% | |
| Apartments.com raises U.S. multifamily rent growth forecast | Press release | Business Wire | +1.27% | -0.49% | |
| CoStar Upgrades U.S. Retail Forecast | Press release | Business Wire | +1.30% | +7.72% | |
| CoStar Projects Steady Decline in U.S. Office Vacancy | Press release | Business Wire | +1.00% | +0.67% | |
| Apartments.com and CoStar Release a Multifamily Vacancy Update for Q2 2026 | Press release | Business Wire | -0.74% | -1.04% | |
| CoStar Data Shows Strong Prelet Activity Driving UK Lab Space Demand to a Record High | Press release | Business Wire | -0.74% | -1.04% | |
| CoStar Expects U.S. Industrial Demand to Outpace Supply by Late 2027 | Press release | Business Wire | -1.90% | -1.24% | |
| CoStar Data Shows London Dominates UK Office Development as Regional Pipeline Hits 20-Year Low | Press release | Business Wire | -0.79% | -0.90% | |
| Apartments.com Releases Multifamily Rent Growth Report for July 2026 | Press release | Business Wire | +1.15% | +4.39% | |
| Form 10-Q COSTAR GROUP, INC. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +1.15% | +4.39% | |
| Form S-8 COSTAR GROUP, INC. | SEC filing · Form S-8 | SEC EDGAR | +1.15% | +4.39% | |
| CoStar Group Q2 2026 Results Mark a Profitability Inflection with Revenue Up 18%, Net Income Increasing 817%, and Adjusted EBITDA More Than Doubling Year-over-Year | Press release | Business Wire | +6.64% | +14.91% | |
| Form 8-K COSTAR GROUP, INC. For: Jul 28 | SEC filing · Form 8-K | SEC EDGAR | +6.64% | +14.91% | |
| Homes.com Shares Most Expensive Home Sales Across Major U.S. Markets in June | Press release | Business Wire | -1.15% | -3.92% | |
| U.S. Retail Asking Rent Growth Slowed in the Second Quarter of 2026 | Press release | Business Wire | +1.04% | -2.81% | |
| CoStar Data Shows Amazon, Defence and Chinese Firms Drive UK Warehouse Demand Recovery | Press release | Business Wire | +0.03% | +4.47% | |
| Homes.com Report: U.S. Home Prices Edge Higher in June as Supply and Demand Trends Remain in Balance | Press release | Business Wire | +2.18% | +1.90% | |
| U.S. Retail Construction Activity Holding Near Post-Pandemic Lows | Press release | Business Wire | +0.78% | +2.52% | |
| CoStar Group Promotes Robin Rossmann to Chief Financial Officer to Drive Margin Expansion and Profitable Growth | Press release | Business Wire | +0.78% | +2.52% | |
| Form 8-K COSTAR GROUP, INC. For: Jul 07 | SEC filing · Form 8-K | SEC EDGAR | +0.78% | +2.52% | |
| U.S. Office Leasing Remained Steady in the Second Quarter of 2026 | Press release | Business Wire | -0.27% | -4.31% | |
| CoStar Group Announces Launch of CoStar Platform in France | Press release | Business Wire | +0.30% | +1.83% | |
| CoStar Group Invests in Wikicasa, Italy’s Agent-Backed Real Estate Marketplace | Press release | Business Wire | +1.57% | +0.96% | |
| CoStar Group to Report Financial Results for Second Quarter on July 28, 2026 | Press release | Business Wire | +0.30% | +1.83% | |
| CoStar Group Stockholders Overwhelmingly Reelect Director Nominees and Support Say-on-Pay at Annual Meeting of Stockholders | Press release | Business Wire | -0.29% | -2.32% | |
| Form 8-K COSTAR GROUP, INC. For: Jun 23 | SEC filing · Form 8-K | SEC EDGAR | -0.29% | -2.32% | |
| Apartments.com Releases Multifamily Rent Growth Report for June 2026 | Press release | Business Wire | -0.29% | -2.32% | |
| Austin, San Jose Lead Apartments.com and CoStar’s U.S. Multifamily Momentum Index | Press release | Business Wire | +1.56% | -2.70% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the CSGP section they belong to.
Where else CSGP is measured.
CSGP earnings → · Analyst actions → · SEC filings →
Other Real Estate names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| NEW YORK REIT (NYRT) | 492 | +0.02% | 51% |
| New Senior Investment Group Inc. (SNR) | 482 | 0.00% | 48% |
| Jones Lang LaSalle Incorporated (JLL) | 473 | +0.07% | 54% |
| CorePoint Lodging Inc. (CPLG) | 472 | -0.10% | 44% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Real Estate names, measured the same way →
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How the numbers are made.
How is CoStar Group, Inc.'s median reaction calculated?
Every labeled CSGP news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 476 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 48% of CSGP's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does CSGP's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.