CoStar Group, Inc.· CSGP

🇺🇸 US · LargeSP500NASDAQ

Real Estate Real Estate - Services Website

Price: $30.91
Day: -2.43%
Mkt Cap: $12.52B
52W Range: $25.89 – $91.01
Volume: 3.88M
Beta: 0.75

D55D FrameworkQuarterly Data

Holdings Analysis

Insider activity, institutional flows, and fund ownership.

Smart Money: 4.0 / 5 (Bullish), from 3 of 3 components
Institutions Q2 2026: 794 institutions hold; 420 added, 267 reduced
Insiders Q3 2026: 1 purchase ($2.5M), 2 sales ($253.1K)

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CoStar Group, Inc.

CSGP|Real Estate|Real Estate - Services

Current price: $31

Smart Money

Dimension 5 of 5

Insider selling pace · Q3 2026

0.6x

quarter in progress, filings still arriving

Seller breadth · Q3 2026

2 sellers

vs 1.0 avg per quarter

Institutional net breadth · Q2 2026

+115

536 adding vs 421 reducing

Institutional ownership · Q2 2026

N/A

overlapping 13F filings

Insider Selling Pace

Each quarter's selling vs this stock's own trailing 6-quarter average

Light <0.5xRoutineElevated >1.5xHeavy >3xBuying

Institutional Positions

Institutions adding above the line, reducing below, net as a line

NewIncreasedReducedClosedNet

Largest Institutional Holders, Q2 2026

By reported market value, and how each moved in the quarter

Holder

Change

VANGUARD PORTFOLIO MANAGEMENT LLC

37.9M

+1.3%

BLACKROCK, INC.

33.8M

+2.2%

VANGUARD CAPITAL MANAGEMENT LLC

26.7M

-0.6%

BAMCO INC /NY/

21.6M

+35.5%

STATE STREET CORP

18.4M

+0.9%

CAPITAL INTERNATIONAL INVESTORS

16.6M

+9.6%

ETF & Fund Activity, Q2 2026

How the covering funds split between buying, holding and selling

266

119

98 buying266 unchanged119 selling

483 funds held CSGP in Q2 2026, holding 222.9M shares between them, up 1.9% on the quarter.

Largest fund holders

Northern Lights Fund Trust131.3K sh

Columbia Funds Variable Series Trust II16.5K sh

EA Series Trust16.2K sh

Notable Insider Transactions, Q3 2026

Largest open-market purchases and sales by value in the last eight quarters

Sale · Oct 25

KLEIN MICHAEL R

$5.4M

Purchase · Aug 4

FLORANCE ANDREW C

$2.5M

Purchase · Feb 27

FLORANCE ANDREW C

$2.5M

Insider transactions from SEC Form 4 filings; institutional holdings from quarterly 13F filings, which are reported with a lag and can overlap between filers. 13F: quarterly institutional holdings report · ETF: Exchange-Traded Fund

See the complete picture

The full 5D Framework: Business Quality · Peer Comparison · Valuation · Analyst Sentiment · Smart Money

Explore CSGP on stockoscope.com→

Generated September 7, 2026

For educational purposes only. Not financial advice. Data may be delayed or incomplete.

Smart Money Sentiment

CSGP Smart Money Sentiment Score

A weighted 1-5 sentiment score across three smart money signals.

Smart Money

4.0/5

Bullish

Weighted across 3 components

Component Breakdown (3 of 3 available)

Insider Activity

40% weight

+51

Institutional Flow

50% weight

+64

Fund Flow

10% weight

Overall Smart Money sentiment of 4.0/5 (Bullish) based on a weighted combination of 3 components. Insider activity uses a relative-baseline comparison against the stock's own history; institutional flow tracks position momentum and 13F share changes; fund flow measures ETF / mutual-fund buying vs selling. Higher scores indicate stronger bullish sentiment from professional investors.Last updated September 6, 2026.

Insider Trading Activity

Insider trading analysis comparing the latest quarter against the stock's own historical baseline.

Insider Selling Pace for CSGP

Each quarter's selling vs the stock's own trailing 6-quarter average; 1.0x is typical for this stock. Green triangles mark quarters with insider buying.

Bullish Signal

Insider buying in Q3 2026

Significant: 1 purchase totaling $2.5M (83.3K shares)

2 sales totaling $253.1K (8.3K shares)

Share volume is 3x+ above the historical average, unusually strong

0.6x

Selling pace

quarter in progress, filings still arriving

0.09%

Stake sold

of active insiders' holdings

2 sellers

Seller breadth

vs 1.0 avg per quarter

$2.5M

Insider buying

1 buyer in Q3 2026

Notable Recent Transactions, CSGP

Top 8 highest-value insider trades from the last 8 quarters

KLEIN MICHAEL R

Director

Sell

71,633 shares at $74.69

≈3.6% of their stake at the time

Oct 25, 2024$5.35M

FLORANCE ANDREW C

Founder and CEO

Buy

83,300 shares at $29.89

≈4.6% of their stake after buying

Aug 4, 2026$2.49M

FLORANCE ANDREW C

CEO

Buy

55,720 shares at $44.52

≈3.5% of their stake after buying

Feb 27, 2026$2.48M

FLORANCE ANDREW C

CEO

Buy

68,330 shares at $35.17

≈4.0% of their stake after buying

May 1, 2026$2.40M

SAINT FREDERICK G.

President, Marketplaces

Sell

25,000 shares at $93.23

≈7.3% of their stake at the time

Jul 28, 2025$2.33M

SAINT FREDERICK G.

President, Marketplaces

Sell

25,000 shares at $90.33

≈7.9% of their stake at the time

Aug 28, 2025$2.26M

SAINT FREDERICK G.

President, Marketplaces

Sell

25,000 shares at $81.10

≈6.8% of their stake at the time

Jun 11, 2025$2.03M

FLORANCE ANDREW C

CEO

Buy

14,731.03 shares at $74.67

≈1.2% of their stake after buying

Oct 25, 2024$1.10M

Institutional Ownership Analysis

Institutional ownership analysis with position momentum, 13F share flow, and ownership percentage trends.

Institutional Positions for CSGP

Institutions adding (new + increased) above zero, reducing (reduced + closed) below, net as a line

New Increased Reduced Closed Net (adding − reducing)

Very Bullish

Institutions accumulating in Q2 2026

13F filings cover more than 100% of shares this quarter (overlapping reports), so ownership and share-flow figures are unreliable

Slight accumulation: 536 adding vs 421 reducing

+115

Net breadth

536 adding vs 421 reducing

Accumulating

1.27

Add / reduce ratio

in Q2 2026

-38

New − closed

116 initiated, 154 exited

6 of 10

Top holders adding

largest holders that added

Position Changes

Q2 2026: how are institutions adjusting their positions?

+536 growing-421 shrinkingNet: +115

116

420

267

154

New (116)

Increased (420)

Reduced (267)

Closed (154)

Top Institutional Holders, CSGP

Largest 8 institutional positions by ownership percentage as of Q2 2026

VANGUARD PORTFOLIO MANAGEMENT LLC

37.9M

$1.1B

Ownership

9.38%

+1.3%

BLACKROCK, INC.

33.8M

$957.6M

Ownership

8.37%

+2.2%

VANGUARD CAPITAL MANAGEMENT LLC

26.7M

$755.7M

Ownership

6.60%

-0.6%

BAMCO INC /NY/

21.6M

$612.5M

Ownership

5.35%

+35.5%

STATE STREET CORP

18.4M

$521.4M

Ownership

4.56%

+0.9%

CAPITAL INTERNATIONAL INVESTORS

16.6M

$471.3M

Ownership

4.12%

+9.6%

BAILLIE GIFFORD & CO

13.2M

$372.5M

Ownership

3.26%

-1.2%

GEODE CAPITAL MANAGEMENT, LLC

12.2M

$343.3M

Ownership

3.01%

-0.1%

ETF and Mutual Fund Holdings

ETF and mutual fund activity breakdown showing buying vs selling funds, top fund holders, and detailed holdings.

Fund Activity

Q2 2026: 483 ETFs and mutual funds reporting

98 buying119 sellingNet: -21

266

119

Buying (98)

Unchanged (266)

Selling (119)

In total, funds bought 20.5M shares and sold 16.2M this quarter. Each fund counts once in the bar above, whatever the size of its move.

Neutral

Mixed fund activity in Q2 2026

483 ETFs and mutual funds reporting

119 funds selling vs 98 buying

Top Fund Holders, CSGP

Largest 8 ETF and mutual fund positions by shares held, each fund's latest filing

Northern Lights Fund Trust

131.3K

Weight

0.27%

Jul 31, 2026No change

Columbia Funds Variable Series Trust II

16.5K

Weight

0.01%

Jun 30, 2026Decreased

EA Series Trust

16.2K

Weight

0.02%

Jun 30, 2026Decreased

MASSMUTUAL SELECT FUNDS

14.9K

Weight

0.84%

Jun 30, 2026No change

FIRST TRUST EXCHANGE-TRADED FUND

13.2K

Weight

0.05%

Jun 30, 2026Decreased

NORTHERN LIGHTS FUND TRUST III

12.2K

Weight

0.08%

Jun 30, 2026Increased

Morgan Stanley ETF Trust

11.3K

Weight

0.00%

Jun 30, 2026Increased

New Age Alpha Variable Funds Trust

9.3K

Weight

4.77%

Jun 30, 2026Decreased

CoStar Group, Inc.· CSGP

Holdings Analysis

Insider Trading Activity

1.3Transaction History74Real market purchases and sales onlyShow All Types

Institutional Ownership Analysis

2.4Detailed Holdings154Most recent institutional positions with changes and valuations

ETF and Mutual Fund Holdings

3.3Fund Holdings Details25Most recent ETF and mutual fund holdings with share counts and weights

Search stocks

Holdings Analysis

Insider Trading Activity

1.3Transaction History74Real market purchases and sales onlyShow All Types

Institutional Ownership Analysis

2.4Detailed Holdings154Most recent institutional positions with changes and valuations

ETF and Mutual Fund Holdings

3.3Fund Holdings Details25Most recent ETF and mutual fund holdings with share counts and weights