// company-profile
Costar Group, Inc.
CSGPExchangeNasdaqSectorServices-Business Services, NECInc.DEFilings150Insiders20
// api This Costar Group, Inc. insider-trading data is served live by the Form4API insider trading API. Get the same data via API.
// activity-summary
Recent insider activity is bearish. Over the last 30 days, insiders net sold $15K across 1 transaction.
// 90-day insight
Over the last 90 days, Costar Group, Inc. insiders bought $2.5M (2 transactions) and sold $15K (1 transaction).
- Most active insider: FLORANCE ANDREW C with 2 transactions totaling $2.5M.
- Largest single purchase: $2.4M by FLORANCE ANDREW C on May 1, 2026.
Activity skews bullish — buys outpace sales.
Institutional Ownership
Top 13F-HR holders of Costar Group, Inc. as of 2026-03-31
Total reported AUM
$14.25B
QoQ change
-41.6%
Reporting period
2026-03-31
#1
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
$1.11B
27.4M shares
#2
STATE STREET CORP
CIK 93751
$752.4M
18.7M shares
#3
PRINCIPAL FINANCIAL GROUP INC
CIK 1126328
$686.4M
17.0M shares
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 15, 2026 | Cann Cynthia Cammett | CSGP | Tax Withholding | 461 | $32.04 | $15K |
| May 1, 2026 | FLORANCE ANDREW C | CSGP | Purchase | 68,330 | $35.17 | $2.40M |
| May 1, 2026 | FLORANCE ANDREW C | CSGP | Purchase | 3,100 | $35.82 | $111K |
| Mar 15, 2026 | Boxer Gene | CSGP | Tax Withholding | 482 | $43.63 | $21K |
| Mar 15, 2026 | Cann Cynthia Cammett | CSGP | Tax Withholding | 1,194 | $43.63 | $52K |
45 more transactions hidden
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