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SEC Form 4 research

COSTAR GROUP INC insider transactions

Inspect COSTAR GROUP INC's public SEC insider acquisitions and sales, reporting owners and source receipts.

As of 2026-10-14T07:26:40.310Z

Issuer CIK
0001057352
Reporting owners
36
Officers and directors
22
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What is a Form 4?

Animation: what a Form 4 is, shown with one real example. Sonic Automotive (SAH) reporting owner Paul P. Rusnak bought 13,701 shares at $59.78 on Wednesday, October 7, 2026, transaction code P, an open-market purchase (S is a sale and A is an award from the company). A timeline marks the SEC's two-business-day filing deadline, which ends Friday, October 9. The SEC accepted the Form 4 at 4:33:21 PM ET on October 9, and NexusTrade treats it as public one minute later, at 4:34:21 PM ET. A lamp for NexusTrade's InsiderTrades indicator stays off from the trade date until that moment, then counts one purchase worth 13,701 × $59.78 = $819,045.78.
In this example the shares were bought on Oct 7, 2026, and NexusTrade's InsiderTrades indicator can count the purchase starting at 4:34:21 PM ET on Oct 9, one minute after the SEC accepted the Form 4.

A Form 4 is the SEC filing a company insider, such as an officer, director or 10% owner, uses to report a trade in the company's stock, generally within two business days. The animation follows one real filing as an example: Paul P. Rusnak's purchase of Sonic Automotive (SAH) shares on October 7, 2026.

The same reading applies to every row on this page. The trade date is when the shares changed hands. The available date is when NexusTrade treats the filing as public, and a NexusTrade InsiderTrades indicator counts a purchase (code P) or sale (code S) only from that moment. Code A awards are not counted as purchases.

Read one actual disclosure before using it

Show the table · 1 row, 7 columns

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2026-08-112026-08-07Cann Cynthia CammettS4,788$30.78Not reported

First displayed source row from Recent insider disclosures. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-08-07 and its public availability date is 2026-08-11. Subtracting those calendar dates gives 4 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code S: a sale. A purchase-following rule excludes this sale even if the reported dollar amount is large.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC accession 0001472762-26-000012 ↗SEC accession 0001351689-26-000005 ↗SEC accession 0001628280-26-052968 ↗

Recent insider disclosures

This table includes purchases, sales and awards in the public filing record. Awards and open-market purchases are distinct transaction codes. For historical research, use the public availability date to determine when the transaction was knowable.

Read code P as a purchase, S as a sale and A as an award. An award is an acquisition, but it is not an open-market purchase. Open the filing receipt to check the transaction details.

Show the table · 5 rows, 7 columns

Scroll sideways to compare all columns. Select a heading to sort.

2026-08-112026-08-07Cann Cynthia CammettS4,788$30.78Not reported
2026-08-112026-08-05Hill John WS3,500$30.21Not reported
2026-08-062026-08-04FLORANCE ANDREW CP83,300$29.89Not reported
2026-08-052026-07-31Rossmann Robin JackA34,771$0Not reported
2026-08-052026-07-31Cann Cynthia CammettA26,078$0Not reported

Most recent 90-day source activity, up to 50 rows. No rows means no matching recent records, not no historical activity.

Officers and directors in the directory

Inspect all 23 displayed rows: Officers and directors in the directory

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Wheeler Scott T000166107312
NASSETTA CHRISTOPHER J000107809580
SAINT FREDERICK G.000150007621
Ruggles Lisa00017171785
Kaplan Laura Cox00016728003
FLORANCE ANDREW C000106606148
SIMURO FRANK00019259602
Radecki Brian J000140219318
Cann Cynthia Cammett00014727626
CARCHEDI FRANCIS000121861518
DESMARAIS MICHAEL J00019259596
FARRINGTON CRAIG00012186143
Glaser Rachel C000149757098
Glosserman Michael J000143626511
HABER WARREN H00009257672
Hill John W000135168921
Kitchen Jennifer00013834107
KLEIN MICHAEL R000106606244
Linnington Matthew00016098229
Marples Paul000141263510
Sams Louise S00017969611
Stanfill John L000143848710
Steinberg David Jay00015224182
Wheeler Scott T ↗NASSETTA CHRISTOPHER J ↗SAINT FREDERICK G. ↗Ruggles Lisa ↗Kaplan Laura Cox ↗FLORANCE ANDREW C ↗SIMURO FRANK ↗Radecki Brian J ↗Cann Cynthia Cammett ↗CARCHEDI FRANCIS ↗DESMARAIS MICHAEL J ↗FARRINGTON CRAIG ↗Glaser Rachel C ↗Glosserman Michael J ↗HABER WARREN H ↗Hill John W ↗Kitchen Jennifer ↗KLEIN MICHAEL R ↗Linnington Matthew ↗Marples Paul ↗Sams Louise S ↗Stanfill John L ↗Steinberg David Jay ↗

Which transactions qualify for the company tracker

The company strategy uses verified officers and directors with qualifying acquisitions at this issuer. Other reporting owners may appear in source records without becoming strategy signals.

Strategy eligibility is held while filing coverage is unresolved.

Historical follower simulations are separate from these source transactions. They do not establish live trading results.