The CoStar Group, Inc. line shows up 18 times in the congressional disclosure record between 2015 and 2025, filed by 7 members: 4 purchases against 14 sales. On balance the chamber has been net sellers, and the purchases sit down 61.5% against the latest close.
*Purchases only, weighted by the midpoint of each disclosed dollar band and marked to the latest close. Filings report a range, never a share count, so this follows the stock rather than anyone's position size.
Members ranked by how their reported CSGP purchases have moved since, over roughly the last three years, weighted by disclosed band midpoint and marked to the latest close.
| Date | Member | Type | Amount | Est. price | Latest close | Return |
|---|---|---|---|---|---|---|
| 2025-09-25 | Lisa McClain | SELL | $1K–$15K | $83.09 | $32.22 2026-08-28 | +61.2% exit |
| 2025-07-31 | Gilbert Cisneros | BUY | $1K–$15K | $95.19 | $32.22 2026-08-28 | -66.2% |
| 2025-07-09 | Gilbert Cisneros | BUY | $1K–$15K | $84.50 | $32.22 2026-08-28 | -61.9% |
| 2025-01-21 | William R. Keating | BUY | $1K–$15K | $74.16 | $32.22 2026-08-28 | -56.5% |
| 2020-10-13 | Greg Gianforte | SELL | $1K–$15K | $88.32 | $32.22 2026-08-28 | +63.5% exit |
| 2020-09-24 | Greg Gianforte | SELL | $100K–$250K | $81.92 | $32.22 2026-08-28 | +60.7% exit |
| 2020-05-07 | Greg Gianforte | SELL | $50K–$100K | $63.90 | $32.22 2026-08-28 | +49.6% exit |
| 2020-01-17 | Josh Gottheimer | SELL | $1K–$15K | $64.96 | $32.22 2026-08-28 | +50.4% exit |
| 2019-11-22 | Josh Gottheimer | SELL | $1K–$15K | $59.06 | $32.22 2026-08-28 | +45.5% exit |
| 2019-10-09 | Gilbert Cisneros | SELL | $1K–$15K | $60.03 | $32.22 2026-08-28 | +46.3% exit |
| 2019-09-26 | Gilbert Cisneros | SELL | $1K–$15K | $59.46 | $32.22 2026-08-28 | +45.8% exit |
| 2019-09-10 | Gilbert Cisneros | SELL | $1K–$15K | $57.97 | $32.22 2026-08-28 | +44.4% exit |
| 2019-09-06 | Greg Gianforte | SELL | $50K–$100K | $61.60 | $32.22 2026-08-28 | +47.7% exit |
| 2019-04-23 | Susie Lee | SELL | $1K–$15K | $49.51 | $32.22 2026-08-28 | +34.9% exit |
| 2018-06-28 | Lamar Smith | SELL | $1K–$15K | $41.53 | $32.22 2026-08-28 | +54.8% rt |
| 2017-10-27 | Greg Gianforte | SELL | $100K–$250K | $29.94 | $32.22 2026-08-28 | -7.6% exit |
| 2017-09-29 | Lamar Smith | BUY | $1K–$15K | $26.82 | $32.22 2026-08-28 | +20.1% |
| 2015-06-03 | Lamar Smith | SELL | $1K–$15K | $20.77 | $32.22 2026-08-28 | -55.1% exit |
Buys are marked to the latest close and treated as open. A sell tagged rt closes an earlier disclosed buy in the same name. exit shows how the stock moved after the member sold.
7 members of the U.S. House and Senate have disclosed CoStar Group, Inc. transactions under the STOCK Act — 4 purchases and 14 sales. The full member-by-member breakdown, with dates and dollar ranges, is in the table above.
No member of Congress has disclosed a CSGP purchase in the last 90 days. STOCK Act filings lag the trade by up to 45 days, so newer buys may still be pending disclosure.
Notional-weighted, lawmakers' disclosed CSGP buys are down 61.5% versus the latest close of $32.22. Each trade's own return — and realized round-trips on matched sells — is in the Return column.
Yes. Under the 2012 STOCK Act, members of Congress may buy and sell individual stocks but must publicly disclose each transaction within 45 days. Bargo surfaces those filings so you can see who traded CSGP and how it performed.