CoStar (CSGP) insider buying
23 open-market purchases of CSGP by CoStar's executives and directors since September 2025, worth $48,360 in total, from SEC Form 4 filings.
The most recent: Ro Khanna bought — on March 23, 2026.
The biggest buyer over the period is Louise S Sams: 1 purchase, $48,360.
By year
| Year | Purchases | Value |
|---|---|---|
| 2026 | 15 | $48,360 |
| 2025 | 8 | $0 |
Biggest buyers
| Insider | Buys | Value |
|---|---|---|
| Louise S Sams | 1 | $48,360 |
| Ro Khanna | 10 | $0 |
| Gilbert Ray Cisneros, Jr. | 12 | $0 |
Every purchase
Newest first. From SEC Form 4 filings. Insider buying across the market.
| Date | Insider | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Mar 23, 2026 | Ro Khanna |
0 | $42.91 | — | — |
| Mar 23, 2026 | Ro Khanna |
0 | $42.91 | — | — |
| Mar 13, 2026 | Gilbert Ray Cisneros, Jr. |
0 | $43.63 | — | — |
| Mar 13, 2026 | Gilbert Ray Cisneros, Jr. |
0 | $43.63 | — | — |
| Mar 10, 2026 | Ro Khanna |
0 | $46.33 | — | — |
| Mar 10, 2026 | Ro Khanna |
0 | $46.33 | — | — |
| Mar 6, 2026 | Louise S Sams |
1,000 | $48.36 | $48,360 | Form 4 |
| Feb 24, 2026 | Ro Khanna |
0 | $49.15 | — | — |
| Feb 24, 2026 | Ro Khanna |
0 | $49.15 | — | — |
| Feb 17, 2026 | Ro Khanna |
0 | $45.74 | — | — |
| Feb 17, 2026 | Ro Khanna |
0 | $45.74 | — | — |
| Jan 29, 2026 | Ro Khanna |
0 | $61.93 | — | — |
| Jan 29, 2026 | Ro Khanna |
0 | $61.93 | — | — |
| Jan 28, 2026 | Gilbert Ray Cisneros, Jr. |
0 | $65.20 | — | — |
| Jan 28, 2026 | Gilbert Ray Cisneros, Jr. |
0 | $65.20 | — | — |
| Dec 10, 2025 | Gilbert Ray Cisneros, Jr. |
0 | $67.87 | — | — |
| Dec 10, 2025 | Gilbert Ray Cisneros, Jr. |
0 | $67.87 | — | — |
| Oct 15, 2025 | Gilbert Ray Cisneros, Jr. |
0 | $75.19 | — | — |
| Oct 15, 2025 | Gilbert Ray Cisneros, Jr. |
0 | $75.19 | — | — |
| Sep 30, 2025 | Gilbert Ray Cisneros, Jr. |
0 | $84.37 | — | — |
| Sep 30, 2025 | Gilbert Ray Cisneros, Jr. |
0 | $84.37 | — | — |
| Sep 22, 2025 | Gilbert Ray Cisneros, Jr. |
0 | $86.31 | — | — |
| Sep 22, 2025 | Gilbert Ray Cisneros, Jr. |
0 | $86.31 | — | — |
Questions
Are CoStar insiders buying the stock?
23 open-market purchases of CSGP by CoStar's executives and directors since September 2025, worth $48,360 in total, from SEC Form 4 filings. The most recent: Ro Khanna bought — on March 23, 2026.
What counts as insider buying here?
Open-market purchases (Form 4 code P) by officers and directors. Option exercises, grants and purchases by 10% owners are left out.
From CoStar's annual reports filed with the SEC (XBRL data), standardised by Investingly. Information only, not investment advice.