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C

CSGP

Nasdaq

COSTAR GROUP, INC.

Latest disclosureAugust 10, 2026
Insider score Why 37?
37/ 100
Qualifying buys · 30d
$0

3 purchases · 2 sales

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Insider transactions 18

Limited filing history
All18Buying3Selling2Other13
Filters

Last 30 daysNo qualifying insider buying. No qualifying insider sales.

18 trades · May 1, 2026 – August 7, 2026Incomplete history: this shows the filings imported so far, not every filing ever made. Dates are trade dates. Filters affect this table only.

Showing the first 6 of 18 trades on this page.

Sale disclosed

Cynthia Cammett Cann

Chief Accounting Officer

Common Stock, par value $0.01 per share

Reported value
$147.37K
Reported price
$30.78 / share
Traded August 7, 2026Filed August 10, 2026SEC filing
Sale disclosed

John W. Hill

Director

Common Stock, par value $0.01 per share

Reported value
$105.74K
Reported price
$30.21 / share
Traded August 5, 2026Filed August 10, 2026SEC filing
Explore furtherTechnical lab Company financials Test a strategy Compare company

Why this buying score?

Qualifying common-equity purchase value

$1,997,962 of common-equity purchase value after transaction-age decay across 180 days.

+25 pts

Distinct buying groups

1 distinct reporting-owner group(s). Joint rows count once; identity is not proof of discretion.

+4 pts

CEO purchase

Qualifying common-equity P acquisition; no disclosed plan, exercise or excluded purchase context detected.

+8 pts

This score describes qualifying insider purchases at issuer level. Read the methodology

Sources and coverage

Source
SEC EDGAR · Form 4
Issuer CIK
0001057352
Latest public acceptance
Aug 10, 2026, 08:06 PM UTC
Score calculated
Oct 7, 2026, 12:06 AM UTC
Parser
form4-parser-1.5
Classifier
form4-classifier-1.1
Scoring methodology
insider-experimental-1.1
Availability
Public filing time, not trade date

Open a transaction's SEC filing for the primary evidence. A code P may describe an open-market or private purchase; classification is not proof of intent.

Insider activity can have many explanations. Signal Strength is not a probability of profit or a recommendation to trade.

Purchase disclosed

Andrew C. Florance

Founder and CEO

Common Stock, par value $0.01 per share

Reported value
$2.49M
Reported price
$29.89 / share
Traded August 4, 2026Filed August 5, 2026SEC filing
Award disclosed

Robin Jack Rossmann

Chief Financial Officer

Restricted Stock Units

Derivative security · not the ordinary share price.

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded July 31, 2026Filed August 4, 2026SEC filing
Tax or exercise withholding

Cynthia Cammett Cann

Chief Accounting Officer

Common Stock, par value $0.01 per share

Value context
$30.97K
Reported price
$28.76 / share
Traded August 1, 2026Filed August 4, 2026SEC filing
Award disclosed

Cynthia Cammett Cann

Chief Accounting Officer

Restricted Stock Units

Derivative security · not the ordinary share price.

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded July 31, 2026Filed August 4, 2026SEC filing
Tax or exercise withholding

Frederick G. Saint

President, Marketplaces

Common Stock, par value $0.01 per share

Value context
$41.3K
Reported price
$28.76 / share
Traded August 1, 2026Filed August 4, 2026SEC filing
Tax or exercise withholding

Christian M. Lown

Chief Financial Officer

Common Stock, par value $0.01 per share

Value context
$164.33K
Reported price
$29.36 / share
Traded July 1, 2026Filed July 6, 2026SEC filing
Award disclosed

Rachel C. Glaser

Director

Common Stock, par value $0.01 per share

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded June 23, 2026Filed June 24, 2026SEC filing
Award disclosed

John L. Berisford

Director

Common Stock, par value $0.01 per share

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded June 23, 2026Filed June 24, 2026SEC filing
Award disclosed

John W. Hill

Director

Common Stock, par value $0.01 per share

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded June 23, 2026Filed June 24, 2026SEC filing
Award disclosed

Angelique G. Brunner

Director

Common Stock, par value $0.01 per share

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded June 23, 2026Filed June 24, 2026SEC filing
Award disclosed

Robert W. Musslewhite

Director

Common Stock, par value $0.01 per share

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded June 23, 2026Filed June 24, 2026SEC filing
Award disclosed

Louise S. Sams

Director

Common Stock, par value $0.01 per share

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded June 23, 2026Filed June 24, 2026SEC filing
Award disclosed

Christine M. McCarthy

Director

Common Stock, par value $0.01 per share

Value context
Non-cash award
Reported price
Award · no purchase price
Understand this price

The filing reports a zero transaction price for this award. It does not mean the awarded securities have no market value.

Traded June 23, 2026Filed June 24, 2026SEC filing
Tax or exercise withholding

Cynthia Cammett Cann

Chief Accounting Officer

Common Stock, par value $0.01 per share

Value context
$14.77K
Reported price
$32.04 / share
Traded June 15, 2026Filed June 16, 2026SEC filing
Purchase disclosed

Andrew C. Florance

President and CEO

Common Stock, par value $0.01 per share

Reported value
$2.4M
Reported price
$35.17 / share
Traded May 1, 2026Filed May 4, 2026SEC filing
Purchase disclosed

Andrew C. Florance

President and CEO

Common Stock, par value $0.01 per share

Reported value
$111.04K
Reported price
$35.82 / share
Traded May 1, 2026Filed May 4, 2026SEC filing
Reporting insiderSecurity / transactionAmount / priceValueTraded / disclosedSource
Chief Accounting OfficerCommon Stock, par value $0.01 per shareSale4,788$30.78 / share$147.37KAug 7Filed Aug 10 · 3d laterSEC filing
DirectorCommon Stock, par value $0.01 per shareSale3,500$30.21 / share$105.74KAug 5Filed Aug 10 · 5d laterSEC filing
Founder and CEOCommon Stock, par value $0.01 per sharePurchase83,300$29.89 / share$2.49MAug 4Filed Aug 5 · 1d laterSEC filing
Chief Financial OfficerRestricted Stock UnitsGrant or awardDerivative units34,771Award · no purchase priceNon-cash awardJul 31Filed Aug 4 · 4d laterSEC filing
Chief Accounting OfficerCommon Stock, par value $0.01 per shareExercise-price or tax withholding1,077$28.76 / share$30.97KAug 1Filed Aug 4 · 3d laterSEC filing
Chief Accounting OfficerRestricted Stock UnitsGrant or awardDerivative units26,078Award · no purchase priceNon-cash awardJul 31Filed Aug 4 · 4d laterSEC filing
President, MarketplacesCommon Stock, par value $0.01 per shareExercise-price or tax withholding1,436$28.76 / share$41.3KAug 1Filed Aug 4 · 3d laterSEC filing
Chief Financial OfficerCommon Stock, par value $0.01 per shareExercise-price or tax withholding5,597$29.36 / share$164.33KJul 1Filed Jul 6 · 5d laterSEC filing
DirectorCommon Stock, par value $0.01 per shareGrant or award8,262Award · no purchase priceNon-cash awardJun 23Filed Jun 24 · 1d laterSEC filing
DirectorCommon Stock, par value $0.01 per shareGrant or award8,262Award · no purchase priceNon-cash awardJun 23Filed Jun 24 · 1d laterSEC filing
DirectorCommon Stock, par value $0.01 per shareGrant or award8,262Award · no purchase priceNon-cash awardJun 23Filed Jun 24 · 1d laterSEC filing
DirectorCommon Stock, par value $0.01 per shareGrant or award8,262Award · no purchase priceNon-cash awardJun 23Filed Jun 24 · 1d laterSEC filing
DirectorCommon Stock, par value $0.01 per shareGrant or award8,262Award · no purchase priceNon-cash awardJun 23Filed Jun 24 · 1d laterSEC filing
DirectorCommon Stock, par value $0.01 per shareGrant or award8,262Award · no purchase priceNon-cash awardJun 23Filed Jun 24 · 1d laterSEC filing
DirectorCommon Stock, par value $0.01 per shareGrant or award8,262Award · no purchase priceNon-cash awardJun 23Filed Jun 24 · 1d laterSEC filing
Chief Accounting OfficerCommon Stock, par value $0.01 per shareExercise-price or tax withholding461$32.04 / share$14.77KJun 15Filed Jun 16 · 1d laterSEC filing
President and CEOCommon Stock, par value $0.01 per sharePurchase2 trades71,430avg $35.20 / share$2.51MMay 1Filed May 4 · 3d later
2 filings
  • 68,330 @ $35.17 · $2.4MSEC filing
  • 3,100 @ $35.82 · $111.04KSEC filing

Congress transactions 9

All Congress filings
Purchase disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a purchase for the member.

Gilbert Cisneros official portraitGilbert CisnerosReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
August 19, 2026
Filed September 10, 2026 · 22d laterOriginal report
Partial sale disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a partial sale for the member.

Gilbert Cisneros official portraitGilbert CisnerosReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
April 14, 2026
Filed May 8, 2026 · 24d laterOriginal report
Purchase disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a purchase for the member.

Gilbert Cisneros official portraitGilbert CisnerosReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
March 13, 2026
Filed April 7, 2026 · 25d laterOriginal report
Purchase disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a purchase for the member.

Gilbert Cisneros official portraitGilbert CisnerosReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
January 28, 2026
Filed February 13, 2026 · 16d laterOriginal report
Purchase disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a purchase for the member.

Gilbert Cisneros official portraitGilbert CisnerosReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
December 10, 2025
Filed January 12, 2026 · 33d laterOriginal report
Purchase disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a purchase for the member.

Gilbert Cisneros official portraitGilbert CisnerosReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
October 15, 2025
Filed November 18, 2025 · 34d laterOriginal report
Sale disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a sale for a spouse.

Lisa McClain official portraitLisa McClainReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
September 25, 2025
Filed October 22, 2025 · 27d laterOriginal report
Purchase disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a purchase for the member.

Gilbert Cisneros official portraitGilbert CisnerosReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
September 30, 2025
Filed October 10, 2025 · 10d laterOriginal report
Purchase disclosed

CoStar Group, Inc. - Common Stock (CSGP) · Stock

The filing reports a purchase for the member.

Gilbert Cisneros official portraitGilbert CisnerosReporting House member
Reported amount
$1,001 – $15,000Reported range; exact amount not disclosed.
Trade date
September 22, 2025
Filed October 10, 2025 · 18d laterOriginal report
Limited filing history · Market-wide discovery does not establish complete company history. View coverage