Stocks › CSGP
COSTAR GROUP, INC.
CSGP·Nasdaq·
United States·USD
United States·USD$27.66
+0.28 (+1.02%)
Close · Oct 5, 2026 · Close Prices from Tiingo.com
CSGP
COSTAR GROUP, INC. · Nasdaq
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
CSGPS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
Loading price history…
Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of CSGP by members of U.S. Congress · 95 on record · 25 in the last 12 months
Whale Activity
Position changes in CSGP reported for 2026-06-30 by 12 tracked institutional filers
- Increased3
- New1
- Held0
- Decreased4
- Closed0
- No prior filing4
| Filer | Shares | Value | Change |
|---|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC | 37.9M | $1.07B | decreased |
| BlackRock, Inc. | 33.8M | $957.6M | increased |
| VANGUARD CAPITAL MANAGEMENT LLC | 26.7M | $755.7M | decreased |
| Meritage Group LP | 5.4M | $152.8M | — |
| BECK MACK & OLIVER LLC | 2.1M | $59.0M | — |
| TWO SIGMA INVESTMENTS, LP | 1.1M | $31.3M | increased |
| D. E. Shaw & Co., Inc. | 1.0M | $29.5M | decreased |
| MILLENNIUM MANAGEMENT LLC | 747.0K | $21.2M | increased |
| CITADEL ADVISORS LLC | 741.9K | $21.0M | decreased |
| Point72 Asset Management, L.P. | 130.6K | $3.7M | new |
| ArchPoint Investors | 126.0K | $3.6M | — |
| Worth Venture Partners, LLC | 12.5K | $354K | — |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by CSGP insiders, by quarter · Form 4
Recent Insider Transactions
1,086 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| Cann Cynthia CammettChief Accounting Officer | Sale | −4,788 | $30.78 | $147K | Aug 7, 2026 | Form 4 ↗ |
| Hill John WDirector · Director | Sale | −3,500 | $30.21 | $106K | Aug 5, 2026 | Form 4 ↗ |
| FLORANCE ANDREW CFounder and CEO · Director | Purchase | +83.3K | $29.89 | $2.5M | Aug 4, 2026 | Form 4 ↗ |
| Sams Louise SDirector | Grant / award | +8,262 | $0.00 | $0 | Jun 23, 2026 | Form 4 ↗ |
| Brunner Angelique G.Director | Grant / award | +8,262 | $0.00 | $0 | Jun 23, 2026 | Form 4 ↗ |
| McCarthy Christine MDirector | Grant / award | +8,262 | $0.00 | $0 | Jun 23, 2026 | Form 4 ↗ |
| Glaser Rachel CDirector | Grant / award | +8,262 | $0.00 | $0 | Jun 23, 2026 | Form 4 ↗ |
| BERISFORD JOHN LDirector | Grant / award | +8,262 | $0.00 | $0 | Jun 23, 2026 | Form 4 ↗ |
| Musslewhite Robert WDirector | Grant / award | +8,262 | $0.00 | $0 | Jun 23, 2026 | Form 4 ↗ |
| Hill John WDirector | Grant / award | +8,262 | $0.00 | $0 | Jun 23, 2026 | Form 4 ↗ |
| Cann Cynthia CammettChief Accounting Officer | Tax withholding | −461 | $32.04 | $15K | Jun 15, 2026 | Form 4 ↗ |
| FLORANCE ANDREW CPresident and CEO · Director | Purchase | +3,100 | $35.82 | $111K | May 1, 2026 | Form 4 ↗ |
| FLORANCE ANDREW CPresident and CEO · Director | Purchase | +68.3K | $35.17 | $2.4M | May 1, 2026 | Form 4 ↗ |
| SIMURO FRANKChief Technology Officer | Tax withholding | −11.1K | $43.63 | $485K | Mar 15, 2026 | Form 4 ↗ |
| DESMARAIS MICHAEL JChief Human Resources Officer | Tax withholding | −2,873 | $43.63 | $125K | Mar 15, 2026 | Form 4 ↗ |
| Boxer GeneGeneral Counsel and Secretary | Tax withholding Amended | −482 | $43.63 | $21K | Mar 15, 2026 | Form 4 ↗ |
| Boxer GeneGeneral Counsel and Secretary | Tax withholding | −428 | $43.63 | $19K | Mar 15, 2026 | Form 4 ↗ |
| Ruggles LisaSenior VP, Global Operations | Tax withholding | −2,977 | $43.63 | $130K | Mar 15, 2026 | Form 4 ↗ |
| Cann Cynthia CammettChief Accounting Officer | Tax withholding | −1,194 | $43.63 | $52K | Mar 15, 2026 | Form 4 ↗ |
| DESMARAIS MICHAEL JChief Human Resources Officer | Grant / award | +17.7K | — | — | Mar 10, 2026 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding CSGP · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| VANGUARD REAL ESTATE INDEX FUND VANGUARD SPECIALIZED FUNDS | 15.9M | $457.1M | 0.63% | Jul 31, 2026 |
| Baron Partners Fund BARON SELECT FUNDS | 15.7M | $444.7M | 2.46% | Jun 30, 2026 |
| VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS | 13.0M | $367.2M | 0.02% | Jun 30, 2026 |
| Invesco QQQ Trust, Series 1 | 8.8M | $356.7M | 0.10% | Mar 31, 2026 |
| MidCap Fund Principal Funds, Inc | 10.1M | $349.2M | 1.39% | Apr 30, 2026 |
| VANGUARD 500 INDEX FUND VANGUARD INDEX FUNDS | 10.6M | $299.5M | 0.02% | Jun 30, 2026 |
| Akre Focus ETF Professionally Managed Portfolios | 8.5M | $244.2M | 4.65% | Jul 31, 2026 |
| VANGUARD U.S. GROWTH FUND VANGUARD WORLD FUND | 5.5M | $178.4M | 0.38% | May 31, 2026 |
| Fidelity 500 Index Fund Fidelity Concord Street Trust | 5.4M | $174.6M | 0.02% | May 31, 2026 |
| iShares Core S&P 500 ETF iShares Trust | 5.6M | $159.1M | 0.02% | Jun 30, 2026 |
Mutual funds and ETFs whose N-PORT filings list CSGP's shares (CUSIP 22160N109), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Activist & Passive Stakes
Schedule 13D / 13G beneficial-ownership filings
- Ronald BaronSCHEDULE 13G · passive (13G) · 21.6M shares5.3%
Aug 14, 2026 · ↗ - Baron Capital Management, Inc.SCHEDULE 13G · passive (13G) · 2.9M shares0.7%
Aug 14, 2026 · ↗ - Baron Capital Group, Inc.SCHEDULE 13G · passive (13G) · 21.6M shares5.3%
Aug 14, 2026 · ↗ - BAMCO INC /NY/SCHEDULE 13G · passive (13G) · 18.7M shares4.6%
Aug 14, 2026 · ↗
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming costar as client
- POLARIS GOVERNMENT RELATIONS, LLCCOSTAR GROUP · 2026 Q2 · RES$60K
Filing ↗ - MILLER STRATEGIES, LLCCOSTAR GROUP, INC. · 2026 Q2 · HOU, LBR$90K
Filing ↗ - POLARIS GOVERNMENT RELATIONS, LLCCOSTAR GROUP · 2026 Q2 · RES$60K
Filing ↗ - PENN AVENUE PARTNERSCOSTAR GROUP, INC. · 2026 Q2 · RES$60K
Filing ↗ - MILLER STRATEGIES, LLCCOSTAR GROUP, INC. · 2026 Q2 · HOU, LBR—
Filing ↗
Government Contracts
Federal awards to COSTAR GROUP, INC. · USAspending
No federal contract awards found for COSTAR GROUP, INC..
U.S. Patents
Recent USPTO applications naming COSTAR GROUP, INC.
No USPTO patent applications found for COSTAR GROUP, INC..
Annual Financials
From CSGP's 10-K filings · XBRL
No annual XBRL figures on record for CSGP. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
- 10-for-1Stock splitJun 28, 2021
Split dates and ratios from the price history · Close Prices from Tiingo.com
Material Events (8-K)
Corporate events filed with the SEC
- 8-K · Items 7.01, 9.01Reg FD disclosureAug 21, 2026
EDGAR ↗ - 8-K · Items 2.02, 9.01Results of operationsJul 28, 2026
EDGAR ↗ - 8-K · Items 5.02, 7.01, 9.01Officer / director change · Reg FD disclosureJul 13, 2026
EDGAR ↗ - 8-K · Items 5.02, 5.07, 7.01, 9.01Officer / director change · Shareholder vote · Reg FD disclosureJun 25, 2026
EDGAR ↗ - 8-K · Items 1.01, 7.01, 9.01Material agreement · Reg FD disclosureMay 29, 2026
EDGAR ↗
About COSTAR GROUP, INC.
From SEC EDGAR company records
Industry (SIC 7389)Services-Business Services, NEC
SectorIndustrials
HeadquartersARLINGTON, VA
IncorporatedDE
SEC CIK0001057352 ↗
Former namesCOSTAR GROUP, INC., COSTAR GROUP INC, REALTY INFORMATION GROUP INC