CSGP · Costar Group, Inc.
Trades by corporate insiders — officers, directors and holders of more than 10% of the shares — disclosed to the SEC on Forms 3, 4 and 5. Form 4 must be filed within two business days of the trade.
Insider Sentiment Score
Peer-relative 0–100 rank of how aggressively insiders accumulated over the trailing 90 days. See the full ranking.
| Date | Insider | Role | Type | Security | Shares |
|---|---|---|---|---|---|
| 2026-08-07 | Cann Cynthia Cammett |
Chief Accounting Officer |
Sell↓
|
Common Stock, par value $0.01 per share
|
4,788 |
| 2026-08-05 | Hill John W |
Director |
Sell↓
|
Common Stock, par value $0.01 per share
|
3,500 |
| 2026-08-04 | FLORANCE ANDREW C |
Director, President and CEO |
Buy↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Average based on sales prices ranging from $29.57 to $29.99. |
Common Stock, par value $0.01 per share
|
83,300 |
| 2026-08-01 | SAINT FREDERICK G. |
President, Marketplaces |
Tax↓
|
Common Stock, par value $0.01 per share
|
1,436 |
| 2026-08-01 | Cann Cynthia Cammett |
Chief Accounting Officer |
Tax↓
|
Common Stock, par value $0.01 per share
|
1,077 |
| 2026-07-31 | Rossmann Robin Jack |
Chief Financial Officer |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in three equal installments on August 1, 2027, August 1, 2028 and August 1, 2029. |
Restricted Stock Units
|
34,771 |
| 2026-07-31 | Cann Cynthia Cammett |
Chief Accounting Officer |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in four equal installments on August 1, 2027, August 1, 2028, August 1, 2029, and August 1, 2030. |
Restricted Stock Units
|
26,078 |
| 2026-07-01 | LOWN CHRISTIAN M. |
EVP & Chief Financial Officer |
Tax↓
|
Common Stock, par value $0.01 per share
|
5,597 |
| 2026-06-23 | Musslewhite Robert W |
Director, Chief Executive Officer |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. |
Common Stock, par value $0.01 per share
|
8,262 |
| 2026-06-23 | McCarthy Christine M |
Director |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. This amount includes shares that were inadvertently omitted from the insider's prior filing. |
Common Stock, par value $0.01 per share
|
8,262 |
| 2026-06-23 | Glaser Rachel C |
Director |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. |
Common Stock, par value $0.01 per share
|
8,262 |
| 2026-06-23 | Brunner Angelique G. |
Director |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. |
Common Stock, par value $0.01 per share
|
8,262 |
| 2026-06-23 | Hill John W |
Director |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. |
Common Stock, par value $0.01 per share
|
8,262 |
| 2026-06-23 | Sams Louise S |
Director |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. |
Common Stock, par value $0.01 per share
|
8,262 |
| 2026-06-23 | BERISFORD JOHN L |
Executive Advisor |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
The restricted stock award vests in full on the earlier of either the first anniversary of the grant date or the date of the Company's 2027 Annual Meeting of Stockholders. |
Common Stock, par value $0.01 per share
|
8,262 |
| 2026-06-15 | Cann Cynthia Cammett |
Chief Accounting Officer |
Tax↓
|
Common Stock, par value $0.01 per share
|
461 |
| 2026-05-01 | FLORANCE ANDREW C |
Director, President and CEO |
Buy↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Average based on sales prices ranging from $35.68 to $36.00. |
Common Stock, par value $0.01 per share
|
3,100 |
| 2026-05-01 | FLORANCE ANDREW C |
Director, President and CEO |
Buy↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Average based on sales prices ranging from $34.67 to $35.67. |
Common Stock, par value $0.01 per share
|
68,330 |
| 2026-03-15 | DESMARAIS MICHAEL J |
Chief Human Resources Officer |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. |
Common Stock, par value $0.01 per share
|
2,873 |
| 2026-03-15 | Ruggles Lisa |
Senior VP, Global Operations |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. |
Common Stock, par value $0.01 per share
|
2,977 |
| 2026-03-15 | Banerjee Nana |
Director |
Other↑
|
No Securities Owned
|
0 |
| 2026-03-15 | SIMURO FRANK |
Chief Technology Officer |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. |
Common Stock, par value $0.01 per share
|
11,107 |
| 2026-03-15 | Boxer Gene |
General Counsel and Secretary |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
This amount reflects a correction due to administrative error. On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. |
Common Stock, par value $0.01 per share
|
482 |
| 2026-03-15 | Cann Cynthia Cammett |
Chief Accounting Officer |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On March 13, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $43.63. |
Common Stock, par value $0.01 per share
|
1,194 |
| 2026-03-10 | Cann Cynthia Cammett |
Chief Accounting Officer |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Pursuant to the Management Stock Purchase Plan, all or a portion of the reporting person's annual cash incentive amount was converted to Deferred Stock Units (each equivalent to one share of common stock) at $46.34 per unit, and the Company awarded the reporting person Restricted Stock Units that vest in full after four years for an equal number of shares of common stock. |
Common Stock, par value $0.01 per share
|
4,374 |
| 2026-03-10 | Boxer Gene |
General Counsel and Secretary |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Pursuant to the Management Stock Purchase Plan, all or a portion of the reporting person's annual cash incentive amount was converted to Deferred Stock Units (each equivalent to one share of common stock) at $46.34 per unit, and the Company awarded the reporting person Restricted Stock Units that vest in full after four years for an equal number of shares of common stock. |
Common Stock, par value $0.01 per share
|
21,920 |
| 2026-03-10 | LOWN CHRISTIAN M. |
EVP & Chief Financial Officer |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Pursuant to the Management Stock Purchase Plan, all or a portion of the reporting person's annual cash incentive amount was converted to Deferred Stock Units (each equivalent to one share of common stock) at $46.34 per unit, and the Company awarded the reporting person Restricted Stock Units that vest in full after four years for an equal number of shares of common stock. |
Common Stock, par value $0.01 per share
|
12,268 |
| 2026-03-10 | DESMARAIS MICHAEL J |
Chief Human Resources Officer |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Pursuant to the Management Stock Purchase Plan, all or a portion of the reporting person's annual cash incentive amount was converted to Deferred Stock Units (each equivalent to one share of common stock) at $46.34 per unit, and the Company awarded the reporting person Restricted Stock Units that vest in full after four years for an equal number of shares of common stock. |
Common Stock, par value $0.01 per share
|
17,676 |
| 2026-03-10 | FLORANCE ANDREW C |
Director, President and CEO |
Award↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Pursuant to the Management Stock Purchase Plan, all or a portion of the reporting person's annual cash incentive amount was converted to Deferred Stock Units (each equivalent to one share of common stock) at $46.34 per unit, and the Company awarded the reporting person Restricted Stock Units that vest in full after four years for an equal number of shares of common stock. |
Common Stock, par value $0.01 per share
|
124,162 |
| 2026-03-06 | Sams Louise S |
Director |
Buy↑
|
Common Stock, par value $0.01 per share
|
1,000 |
| 2026-03-02 | SAINT FREDERICK G. |
President, Marketplaces |
Buy↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Average based on sales prices ranging from $45.26 to $45.38 |
Common Stock, par value $0.01 per share
|
20,000 |
| 2026-03-02 | Glaser Rachel C |
Director |
Buy↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
This amount includes shares that were inadvertently omitted from the insider's prior filing. |
Common Stock, par value $0.01 per share
|
1,000 |
| 2026-03-01 | Boxer Gene |
General Counsel and Secretary |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. |
Common Stock, par value $0.01 per share
|
4,547 |
| 2026-03-01 | Cann Cynthia Cammett |
Chief Accounting Officer |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. Includes 142 shares acquired under the CoStar Group, Inc. Employee Stock Purchase Plan. |
Common Stock, par value $0.01 per share
|
1,385 |
| 2026-03-01 | SAINT FREDERICK G. |
President, Marketplaces |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. |
Common Stock, par value $0.01 per share
|
11,096 |
| 2026-03-01 | SIMURO FRANK |
Chief Technology Officer |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. |
Common Stock, par value $0.01 per share
|
18,702 |
| 2026-03-01 | FLORANCE ANDREW C |
Director, President and CEO |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. |
Common Stock, par value $0.01 per share
|
59,593 |
| 2026-03-01 | DESMARAIS MICHAEL J |
Chief Human Resources Officer |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. Includes 157 shares acquired under the CoStar Group, Inc. Employee Stock Purchase Plan. |
Common Stock, par value $0.01 per share
|
6,353 |
| 2026-03-01 | LOWN CHRISTIAN M. |
EVP & Chief Financial Officer |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. |
Common Stock, par value $0.01 per share
|
7,175 |
| 2026-03-01 | Ruggles Lisa |
Senior VP, Global Operations |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 27, 2026, the last preceding business day, the closing price of the Company's common stock on Nasdaq was $44.63. |
Common Stock, par value $0.01 per share
|
8,931 |
| 2026-02-27 | SIMURO FRANK |
Chief Technology Officer |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. |
Restricted Stock Units
|
52,869 |
| 2026-02-27 | DESMARAIS MICHAEL J |
Chief Human Resources Officer |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. |
Restricted Stock Units
|
17,926 |
| 2026-02-27 | Ruggles Lisa |
Senior VP, Global Operations |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. |
Restricted Stock Units
|
28,197 |
| 2026-02-27 | Cann Cynthia Cammett |
Chief Accounting Officer |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in four equal installments on March 1, 2027, March 1, 2028, March 1, 2029, and March 1, 2030. |
Restricted Stock Units
|
6,834 |
| 2026-02-27 | FLORANCE ANDREW C |
Director, President and CEO |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. |
Restricted Stock Units
|
83,708 |
| 2026-02-27 | FLORANCE ANDREW C |
Director, President and CEO |
Buy↑
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
Average based on sales prices ranging from $44.08 to $44.74. |
Common Stock, par value $0.01 per share
|
55,720 |
| 2026-02-27 | SAINT FREDERICK G. |
President, Marketplaces |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. |
Restricted Stock Units
|
39,652 |
| 2026-02-27 | Boxer Gene |
General Counsel and Secretary |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. |
Restricted Stock Units
|
26,888 |
| 2026-02-27 | LOWN CHRISTIAN M. |
EVP & Chief Financial Officer |
Award↑
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of CoStar Group, Inc. common stock. The restricted stock units vest in three equal installments on March 1, 2027, March 1, 2028 and March 1, 2029. |
Restricted Stock Units
|
39,652 |
| 2026-02-19 | SAINT FREDERICK G. |
President, Marketplaces |
Tax↓
Filing footnotes — Common Stock, par value $0.01 per share (Direct)
On February 19, 2026, the closing price of the Company's Common Stock on Nasdaq was $49.07. |
Common Stock, par value $0.01 per share
|
2,149 |