Costar Group Inc (CSGP): Congress and insider trades
Who in Congress and inside the company traded CSGP, when each filing appeared, and what buying after each one would have earned against the S&P 500.
Key Facts
- Costar Group Inc (CSGP) is a listed stock on NASDAQ.
- 7 members of Congress filed 25 buys and 26 sells of CSGP, the latest published 2026-09-11 (11 September 2026).
- Insiders filed 2 open market buys worth $5.0M and 2 sells worth $253K, the latest filed 2026-08-10 (10 August 2026).
- Across 16 scored buys, Congress averaged -11.1% against the S&P 500 (SPY) over the 90 days after disclosure, with 25% of them ahead of the index. That result is modestly below the market, but could still be chance.
- Across 1 scored buy, Insiders averaged -18.9% against the S&P 500 (SPY) over the 90 days after disclosure, with 0% of them ahead of the index. That result is too few trades to tell.
- Data as of 2026-09-29 (29 September 2026).
Congress trades in CSGP
as of 2026-09-11| Filed | Member | Type | Size | Days to file | 90 day vs S&P |
|---|---|---|---|---|---|
| 11 Sep 2026 | Gil Cisneros (D-CA) | buy | 1K–15K | 22 | n/a |
| 12 Aug 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 18 | n/a |
| 8 Jul 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 20 | n/a |
| 8 Jul 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 6 | n/a |
| 11 Jun 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 13 | -12.6% |
| 13 May 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 17 | n/a |
| 13 May 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 28 | n/a |
| 11 May 2026 | Gil Cisneros (D-CA) | sell | 1K–15K | 24 | n/a |
| 9 Apr 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 28 | -30.9% |
| 9 Apr 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 15 | -30.9% |
| 9 Apr 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 8 | n/a |
| 8 Apr 2026 | Gil Cisneros (D-CA) | buy | 1K–15K | 25 | -31.3% |
| 12 Mar 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 32 | n/a |
| 12 Mar 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 13 | -36.9% |
| 12 Mar 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 20 | -36.9% |
| 16 Feb 2026 | Gil Cisneros (D-CA) | buy | 1K–15K | 16 | -35.9% |
| 13 Jan 2026 | Gil Cisneros (D-CA) | buy | 1K–15K | 33 | -42.0% |
| 2 Jun 2025 | Rob Bresnahan (R-PA) | sell | 1K–15K | 16 | n/a |
| 10 Nov 2023 | Ro Khanna (D-CA) | sell | 1K–15K | 37 | n/a |
| 10 Nov 2023 | Ro Khanna (D-CA) | sell | 1K–15K | 8 | n/a |
| 10 Nov 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 29 | -8.5% |
| 14 Jun 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 20 | -4.9% |
| 22 May 2023 | Daniel S. Goldman (D-NY) | buy | 15K–50K | 39 | -6.5% |
| 17 Apr 2023 | Daniel S. Goldman (D-NY) | sell | 15K–50K | 42 | n/a |
| 12 Apr 2023 | Ro Khanna (D-CA) | sell | 1K–15K | 24 | n/a |
| 12 Apr 2023 | Ro Khanna (D-CA) | sell | 1K–15K | 14 | n/a |
| 12 Oct 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 8 | +4.1% |
| 12 Oct 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 8 | +4.1% |
| 11 Jul 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 20 | n/a |
| 15 Jun 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 36 | +26.0% |
| 15 Jun 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 18 | n/a |
| 15 Jun 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 31 | +26.0% |
| 12 May 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 23 | +21.9% |
| 12 May 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 25 | +21.9% |
| 12 May 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 15 | n/a |
| 11 Mar 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 22 | n/a |
| 11 Mar 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 19 | +11.0% |
| 9 Feb 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 28 | -10.1% |
| 9 Feb 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 19 | -10.1% |
| 10 Jan 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 31 | n/a |
| 8 Dec 2021 | Ro Khanna (D-CA) | sell | 1K–15K | 28 | n/a |
| 16 Sep 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 29 | -18.4% |
| 16 Sep 2021 | Ro Khanna (D-CA) | sell | 1K–15K | 40 | n/a |
| 14 Aug 2021 | Ro Khanna (D-CA) | sell | 1K–15K | 42 | n/a |
| 14 Jul 2021 | Ro Khanna (D-CA) | sell | 1K–15K | 20 | n/a |
| 11 Jun 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 20 | -2.6% |
| 11 Jun 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 28 | -2.6% |
| 11 Mar 2021 | Josh Gottheimer (D-NJ) | sell | 1K–15K | 33 | n/a |
| 12 Jan 2021 | Susie Lee (D-NV) | sell | 1K–15K | 20 | n/a |
| 10 Nov 2020 | Greg Gianforte (R-MT) | sell | 1K–15K | 27 | n/a |
| 6 Nov 2020 | Gil Cisneros (D-CA) | sell | 1K–15K | 29 | n/a |
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Insider trades in CSGP
as of 2026-08-10| Filed | Insider | Type | Shares | Price | Value | 90 day vs S&P |
|---|---|---|---|---|---|---|
| 10 Aug 2026 | Hill John W | sell | 3,500 | $30.21 | $106K | n/a |
| 10 Aug 2026 | Cann Cynthia Cammett | sell | 4,788 | $30.78 | $147K | n/a |
| 5 Aug 2026 | FLORANCE ANDREW C | buy | 83,300 | $29.89 | $2.5M | n/a |
| 4 May 2026 | FLORANCE ANDREW C | buy | 71,430 | $35.20 | $2.5M | -18.9% |
Nothing matches that search.
Related pages
Frequently asked questions
Who has bought CSGP?
25 Congress buys by 7 members and 2 insider buys are on file. The tables on this page list every one.
Did buying CSGP after a disclosure beat the market?
Across 16 scored buys, Congress averaged -11.1% against the S&P 500 (SPY) over the 90 days after disclosure, with 25% of them ahead of the index. That result is modestly below the market, but could still be chance. Across 1 scored buy, Insiders averaged -18.9% against the S&P 500 (SPY) over the 90 days after disclosure, with 0% of them ahead of the index. That result is too few trades to tell. A single stock is a small sample.
Sources: Congressional trades: STOCK Act disclosures, collected from CapitolTrades. Insider trades: SEC Form 4 filings, collected from Finviz. Prices: Yahoo Finance daily adjusted closes. Data as of 2026-09-29 (29 September 2026). About these sources.
Not investment advice. Past disclosed trades do not predict future returns. Disclosures are published late, so the trades shown are ones you could only have copied after the fact. Talk to a licensed adviser before you invest.