Insider txns (12m)
63
Stock / equity
CSGP COSTAR GROUP, INC.
- Company
- COSTAR GROUP, INC.
- Security
- Equity
- Size, estimated from filings
- Large cap ($10B – $200B)
- Insiders on record
- 16
- Members of Congress
- 2
- Latest trade on record
- October 15, 2026
CSGP (COSTAR GROUP, INC.) has 63 disclosed insider transactions from 16 insiders in the last 12 months (7 open-market buys, 34 sales, about $18.0M at reported prices) and 7 congressional trades from 2 members of Congress. The most recent disclosure was filed October 16, 2026.
Open-market buys / sales
7 / 34
Congress trades (12m)
7
Distinct filers (12m)
18
Share price
Price and chart by TradingView for COSTAR GROUP, INC.. US share prices here are delayed, not real-time. The trade records on this page come from government filings, not from this chart.
CSGP in charts
Who is trading this stock
Which people account for the buying and selling over the last 12 months?
BoughtSold
8 people account for the disclosed buying and selling in CSGP over the last 12 months; the most active is FLORANCE ANDREW C with $12M.
Prices insiders traded at
What price did insiders buy and sell at? Each marker is one open-market trade at the share price reported on its Form 4.
▲ Bought▼ SoldAverage reported price that day
Insiders reported 11 open-market trades in CSGP since Nov 13, 2025, at prices from $29.89 to $68.79; the most recent was a sale at $30.78 on Aug 7, 2026. These are the prices on the filings, not adjusted for stock splits, and not a market price series.
Insider holdings over time
Is an insider building or unwinding a position? Shares held directly after each filing.
Cann Cynthia CammettFLORANCE ANDREW C
Cann Cynthia Cammett reported 18,822 shares held after the latest filing, against 23,211 at the first on record.
Lobbying spend by quarter
How much has COSTAR GROUP, INC. reported spending on federal lobbying?
COSTAR GROUP, INC. reported $570K in lobbying over the last eight quarters, from filings matched by exact company name.
Insiders trading CSGP
Everyone who filed a Form 4 for this ticker, by number of rows on record. "Bought" and "sold" count open-market purchases (code P) and sales only; awards, option exercises and shares withheld for tax are in the row count but not in those two columns. Showing 15 of 16.
| Insider | Role | Rows | Bought | Sold | Value bought | Value sold | Latest |
|---|---|---|---|---|---|---|---|
| FLORANCE ANDREW C | President and CEO | 10 | 4 | 4 | $7.5M | $4.4M | August 4, 2026 |
| Cann Cynthia Cammett | Chief Accounting Officer | 9 | 0 | 6 | — | $434K | August 7, 2026 |
| SAINT FREDERICK G. | President, Marketplaces | 7 | 1 | 5 | $907K | $751K | August 1, 2026 |
| Ruggles Lisa | Senior VP, Global Operations | 6 | 0 | 5 | — | $847K | March 15, 2026 |
| SIMURO FRANK | Chief Technology Officer | 6 | 0 | 5 | — | $1.7M | March 15, 2026 |
| LOWN CHRISTIAN M. | Chief Financial Officer | 4 | 0 | 2 | — | $485K | July 1, 2026 |
| Boxer Gene | General Counsel and Secretary | 4 | 0 | 2 | — | $222K | March 15, 2026 |
| DESMARAIS MICHAEL J | Chief Human Resources Officer | 4 | 0 | 2 | — | $409K | March 15, 2026 |
| Hill John W | Director | 3 | 0 | 2 | — | $260K | August 5, 2026 |
| Rossmann Robin Jack | Chief Financial Officer | 2 | 0 | 1 | — | $24K | October 15, 2026 |
| Glaser Rachel C | Director | 2 | 1 | 0 | $45K | — | June 23, 2026 |
| Sams Louise S | Director | 2 | 1 | 0 | $48K | — | June 23, 2026 |
| BERISFORD JOHN L | Director | 1 | 0 | 0 | — | — | June 23, 2026 |
| Brunner Angelique G. | Director | 1 | 0 | 0 | — | — | June 23, 2026 |
| McCarthy Christine M | Director | 1 | 0 | 0 | — | — | June 23, 2026 |
What kind of transactions these are 5 Form 4 codes
| Code | Meaning | Rows | Shares | Value at reported prices |
|---|---|---|---|---|
| F | Shares withheld for tax | 26 | 202,331 | $9.0M |
| A | Grant or award | 22 | 594,809 | — |
| P | Open-market purchase | 7 | 232,450 | $8.5M |
| D | Sale back to the company | 4 | 170,876 | — |
| S | Open-market sale | 4 | 12,379 | $534K |
What each code means: Form 4 transaction codes.
Members of Congress trading CSGP
Members whose periodic transaction reports name this ticker. Amounts are the sums of the ranges as filed.
| Member | Seat | Trades | Bought | Sold | Range as filed | Latest |
|---|---|---|---|---|---|---|
| Gilbert Ray Cisneros, Jr. | Representative (CA, District 31), Democrat | 8 | 7 | 1 | $8,008–$120K | August 19, 2026 |
| Lisa C. McClain | Representative (MI, District 9), Republican | 1 | 0 | 1 | $1,001–$15K | September 25, 2025 |
Insider transactions
| Filer | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| Rossmann Robin Jack | Sell F | October 15, 2026 | October 16, 2026 | 1d | 756 | $32 | $24K | Form 4 ↗ | ||
| Cann Cynthia Cammett | Sell S | August 7, 2026 | August 10, 2026 | 3d | 4,788 | $31 | $147K | Form 4 ↗ | ||
| Hill John W | Sell S | August 5, 2026 | August 10, 2026 | 5d | 3,500 | $30 | $106K | late | Form 4 ↗ | |
| FLORANCE ANDREW C | Buy P | August 4, 2026 | August 5, 2026 | 1d | 83,300 | $30 | $2.5M | Form 4 ↗ | ||
| Rossmann Robin Jack | Other A | July 31, 2026 | August 4, 2026 | 4d | 34,771 | — | — | derivative | Form 4 ↗ | |
| Cann Cynthia Cammett | Other A | July 31, 2026 | August 4, 2026 | 4d | 26,078 | — | — | derivative | Form 4 ↗ | |
| Cann Cynthia Cammett | Sell F | August 1, 2026 | August 4, 2026 | 3d | 1,077 | $29 | $31K | Form 4 ↗ | ||
| SAINT FREDERICK G. | Sell F | August 1, 2026 | August 4, 2026 | 3d | 1,436 | $29 | $41K | Form 4 ↗ | ||
| LOWN CHRISTIAN M. | Sell F | July 1, 2026 | July 6, 2026 | 5d | 5,597 | $29 | $164K | late | Form 4 ↗ | |
| Glaser Rachel C | Other A | June 23, 2026 | June 24, 2026 | 1d | 8,262 | — | — | Form 4 ↗ | ||
| BERISFORD JOHN L | Other A | June 23, 2026 | June 24, 2026 | 1d | 8,262 | — | — | Form 4 ↗ | ||
| Hill John W | Other A | June 23, 2026 | June 24, 2026 | 1d | 8,262 | — | — | Form 4 ↗ | ||
| Brunner Angelique G. | Other A | June 23, 2026 | June 24, 2026 | 1d | 8,262 | — | — | Form 4 ↗ | ||
| Musslewhite Robert W | Other A | June 23, 2026 | June 24, 2026 | 1d | 8,262 | — | — | Form 4 ↗ | ||
| Sams Louise S | Other A | June 23, 2026 | June 24, 2026 | 1d | 8,262 | — | — | Form 4 ↗ | ||
| McCarthy Christine M | Other A | June 23, 2026 | June 24, 2026 | 1d | 8,262 | — | — | Form 4 ↗ | ||
| Cann Cynthia Cammett | Sell F | June 15, 2026 | June 16, 2026 | 1d | 461 | $32 | $15K | Form 4 ↗ | ||
| FLORANCE ANDREW C | Buy P | May 1, 2026 | May 4, 2026 | 3d | 3,100 | $36 | $111K | Form 4 ↗ | ||
| FLORANCE ANDREW C | Buy P | May 1, 2026 | May 4, 2026 | 3d | 68,330 | $35 | $2.4M | Form 4 ↗ | ||
| Ruggles Lisa | Sell F | March 15, 2026 | March 17, 2026 | 2d | 2,977 | $44 | $130K | Form 4 ↗ | ||
| Boxer Gene | Sell F | March 15, 2026 | March 17, 2026 | 2d | 428 | $44 | $19K | Form 4 ↗ | ||
| SIMURO FRANK | Sell F | March 15, 2026 | March 17, 2026 | 2d | 11,107 | $44 | $485K | Form 4 ↗ | ||
| DESMARAIS MICHAEL J | Sell F | March 15, 2026 | March 17, 2026 | 2d | 2,873 | $44 | $125K | Form 4 ↗ | ||
| Cann Cynthia Cammett | Sell F | March 15, 2026 | March 17, 2026 | 2d | 1,194 | $44 | $52K | Form 4 ↗ | ||
| Cann Cynthia Cammett | Other A | March 10, 2026 | March 11, 2026 | 1d | 4,374 | — | — | Form 4 ↗ | ||
| FLORANCE ANDREW C | Other A | March 10, 2026 | March 11, 2026 | 1d | 124,162 | — | — | Form 4 ↗ | ||
| LOWN CHRISTIAN M. | Other A | March 10, 2026 | March 11, 2026 | 1d | 12,268 | — | — | Form 4 ↗ | ||
| Boxer Gene | Other A | March 10, 2026 | March 11, 2026 | 1d | 21,920 | — | — | Form 4 ↗ | ||
| DESMARAIS MICHAEL J | Other A | March 10, 2026 | March 11, 2026 | 1d | 17,676 | — | — | Form 4 ↗ | ||
| Sams Louise S | Buy P | March 6, 2026 | March 9, 2026 | 3d | 1,000 | $48 | $48K | Form 4 ↗ | ||
| LOWN CHRISTIAN M. | Other A | February 27, 2026 | March 3, 2026 | 4d | 39,652 | — | — | derivative | Form 4 ↗ | |
| LOWN CHRISTIAN M. | Sell F | March 1, 2026 | March 3, 2026 | 2d | 7,175 | $45 | $320K | Form 4 ↗ | ||
| SAINT FREDERICK G. | Other A | February 27, 2026 | March 3, 2026 | 4d | 39,652 | — | — | derivative | Form 4 ↗ | |
| FLORANCE ANDREW C | Other A | February 27, 2026 | March 3, 2026 | 4d | 83,708 | — | — | derivative | Form 4 ↗ | |
| FLORANCE ANDREW C | Sell F | March 1, 2026 | March 3, 2026 | 2d | 59,593 | $45 | $2.7M | Form 4 ↗ | ||
| Boxer Gene | Other A | February 27, 2026 | March 3, 2026 | 4d | 26,888 | — | — | derivative | Form 4 ↗ | |
| Boxer Gene | Sell F | March 1, 2026 | March 3, 2026 | 2d | 4,547 | $45 | $203K | Form 4 ↗ | ||
| DESMARAIS MICHAEL J | Other A | February 27, 2026 | March 3, 2026 | 4d | 17,926 | — | — | derivative | Form 4 ↗ | |
| DESMARAIS MICHAEL J | Sell F | March 1, 2026 | March 3, 2026 | 2d | 6,353 | $45 | $284K | Form 4 ↗ | ||
| Cann Cynthia Cammett | Other A | February 27, 2026 | March 3, 2026 | 4d | 6,834 | — | — | derivative | Form 4 ↗ | |
| Cann Cynthia Cammett | Sell F | March 1, 2026 | March 3, 2026 | 2d | 1,385 | $45 | $62K | Form 4 ↗ | ||
| Ruggles Lisa | Other A | February 27, 2026 | March 3, 2026 | 4d | 28,197 | — | — | derivative | Form 4 ↗ | |
| Ruggles Lisa | Sell F | March 1, 2026 | March 3, 2026 | 2d | 8,931 | $45 | $399K | Form 4 ↗ | ||
| SIMURO FRANK | Other A | February 27, 2026 | March 3, 2026 | 4d | 52,869 | — | — | derivative | Form 4 ↗ | |
| SIMURO FRANK | Sell F | March 1, 2026 | March 3, 2026 | 2d | 18,702 | $45 | $835K | Form 4 ↗ | ||
| Glaser Rachel C | Buy P | March 2, 2026 | March 3, 2026 | 1d | 1,000 | $45 | $45K | Form 4 ↗ | ||
| SAINT FREDERICK G. | Buy P | March 2, 2026 | March 3, 2026 | 1d | 20,000 | $45 | $907K | Form 4 ↗ | ||
| SAINT FREDERICK G. | Sell F | March 1, 2026 | March 3, 2026 | 2d | 11,096 | $45 | $495K | Form 4 ↗ | ||
| FLORANCE ANDREW C | Buy P | February 27, 2026 | March 2, 2026 | 3d | 55,720 | $45 | $2.5M | Form 4 ↗ | ||
| SIMURO FRANK | Sell F | February 19, 2026 | February 23, 2026 | 4d | 4,421 | $49 | $217K | Form 4 ↗ | ||
| SIMURO FRANK | Sell D | February 19, 2026 | February 23, 2026 | 4d | 30,727 | — | — | Form 4 ↗ | ||
| SAINT FREDERICK G. | Sell F | February 19, 2026 | February 23, 2026 | 4d | 2,149 | $49 | $105K | Form 4 ↗ | ||
| SAINT FREDERICK G. | Sell D | February 19, 2026 | February 23, 2026 | 4d | 17,583 | — | — | Form 4 ↗ | ||
| FLORANCE ANDREW C | Sell F | February 19, 2026 | February 23, 2026 | 4d | 19,221 | $49 | $943K | Form 4 ↗ | ||
| FLORANCE ANDREW C | Sell D | February 19, 2026 | February 23, 2026 | 4d | 104,983 | — | — | Form 4 ↗ | ||
| Ruggles Lisa | Sell F | February 19, 2026 | February 23, 2026 | 4d | 3,219 | $49 | $158K | Form 4 ↗ | ||
| Ruggles Lisa | Sell D | February 19, 2026 | February 23, 2026 | 4d | 17,583 | — | — | Form 4 ↗ | ||
| SIMURO FRANK | Sell F | February 15, 2026 | February 18, 2026 | 3d | 4,151 | $45 | $187K | Form 4 ↗ | ||
| FLORANCE ANDREW C | Sell F | February 15, 2026 | February 18, 2026 | 3d | 17,482 | $45 | $787K | Form 4 ↗ | ||
| Ruggles Lisa | Sell F | February 15, 2026 | February 18, 2026 | 3d | 3,576 | $45 | $161K | Form 4 ↗ | ||
| SAINT FREDERICK G. | Sell F | February 15, 2026 | February 18, 2026 | 3d | 2,424 | $45 | $109K | Form 4 ↗ | ||
| Hill John W | Sell S | November 13, 2025 | November 17, 2025 | 4d | 2,250 | $69 | $155K | Form 4 ↗ | ||
| Cann Cynthia Cammett | Sell S | November 13, 2025 | November 17, 2025 | 4d | 1,841 | $69 | $127K | Form 4 ↗ |
Congressional trades
| Filer | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| Gilbert Ray Cisneros, Jr. | Buy | August 19, 2026 | September 10, 2026 | 22d | — | — | $1,001–$15K | House PTR ↗ | ||
| Gilbert Ray Cisneros, Jr. | Sell | April 14, 2026 | May 8, 2026 | 24d | — | — | $1,001–$15K | House PTR ↗ | ||
| Gilbert Ray Cisneros, Jr. | Buy | March 13, 2026 | April 7, 2026 | 25d | — | — | $1,001–$15K | House PTR ↗ | ||
| Gilbert Ray Cisneros, Jr. | Buy | January 28, 2026 | February 13, 2026 | 16d | — | — | $1,001–$15K | House PTR ↗ | ||
| Gilbert Ray Cisneros, Jr. | Buy | December 10, 2025 | January 12, 2026 | 33d | — | — | $1,001–$15K | House PTR ↗ | ||
| Gilbert Ray Cisneros, Jr. | Buy | October 15, 2025 | November 18, 2025 | 34d | — | — | $1,001–$15K | House PTR ↗ | ||
| Lisa C. McClain | Sell | September 25, 2025 | October 22, 2025 | 27d | — | — | $1,001–$15K | spouse | House PTR ↗ | |
| Gilbert Ray Cisneros, Jr. | Buy | September 22, 2025 | October 10, 2025 | 18d | — | — | $1,001–$15K | House PTR ↗ | ||
| Gilbert Ray Cisneros, Jr. | Buy | September 30, 2025 | October 10, 2025 | 10d | — | — | $1,001–$15K | House PTR ↗ |
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Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- How to read a congressional trade report Owner tells you whose asset it was: the member, the spouse, a dependent child, or held jointly.
- Why congressional trade amounts are ranges There are ten ranges; the lowest is $1,001–$15,000 and the highest is over $50,000,000.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| House Clerk, periodic transaction reports | 8 | 9 | October 10, 2025 | September 10, 2026 | House Clerk search |
| SEC EDGAR, Form 4 | 49 | 63 | November 17, 2025 | October 16, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Insider rows are Form 4 filings for this issuer from SEC EDGAR; congressional rows are periodic transaction reports parsed from the House Clerk and the Senate eFD. Values use the reported price for Form 4 and the disclosed range for Congress. See methodology and corrections.
Not investment advice. Disclosures are shown as filed and may lag the trade or be amended. No recommendation is made or implied.