Four insiders bought $3.48M in stock over 90 days with zero sales and a cluster alert. Institutional flows are mildly negative (453 sellers vs 422 buyers) but high-conviction holders Akre Capital and Meritage Group maintain outsized positions.

Confirmation

Continued insider purchases or a shift to institutional net accumulation would reinforce this call.

Invalidation Risk

Any insider selling or a sharp increase in institutional distribution would invalidate the bullish view.

The above is AI-generated from public regulatory filings and summarizes historical data only. It is not investment advice and should not be used as the basis for any buy or sell decision.

Insider Trading (Form 4)

6890d confidence

unique buyers

$3.48M

buy value

data as of 2026-07-16

12-Month Buy/Sell Activity

Mar 25

Aug 25

Mar 26

BuySell

操作	內部人	職稱	交易日	金額
買入	Sams Louise S	Director	2026-03-06	$48K
買入	Glaser Rachel C	Director	2026-03-02	$45K
買入	SAINT FREDERICK G.	President, Marketplaces	2026-03-02	$907K
買入	FLORANCE ANDREW C	President and CEO	2026-02-27	$2.48M
賣出	Hill John W	Director	2025-11-13	$155K
賣出	Cann Cynthia Cammett	Chief Accounting Officer	2025-11-13	$127K
賣出	SAINT FREDERICK G.	President, Marketplaces	2025-08-28	$2.26M
賣出	SAINT FREDERICK G.	President, Marketplaces	2025-07-28	$2.33M

View all insider trades →

Form 144 Pre-Sale Notices

No Form 144 planned sale filings in the last 90 days

Beneficial Ownership (13D/13G)

No Schedule 13D/13G filings for this ticker

Material Events (8-K)

Filings (14d)

Data as of 2026-07-13

2026-07-13

On July 7, 2026, CoStar Group disclosed that CFO Christian Lown will resign on July 31, 2026, to pursue an opportunity outside the industry. The board appointed Robin Rossmann, currently Managing Director for Europe, as the new CFO, effective the same day. Rossmann will receive an annual salary of £440,000 (increasing to $590,000 upon relocating to the U.S.), a target bonus of 100% of salary, a one-time equity award valued at $2.5 million, and a $500,000 relocation subsidy.

View Full Filing (SEC EDGAR)

View all Form 8-K filings

FAQ

Who are the top institutional investors holding COSTAR GROUP INC (CSGP)?

Major stakeholders currently include Vanguard Portfolio Management LLC ($1.5B), BlackRock, Inc. ($1.4B), Vanguard Capital Management LLC ($1.1B). Based on the latest 13F filings, there are a total of 792 tracked investment funds and institutions maintaining positions in CSGP.

What is the overall institutional sentiment toward CSGP recently?

Institutional sentiment appears Bearish (Net Selling). During the most recent reporting quarter, the stock experienced a net outflow of $11.4B, driven by 423 managers accumulating shares while 453 reduced their exposure.

Which institutions have been selling or reducing their CSGP positions?

In the latest period, 276 funds trimmed their holdings, and 177 managers completely exited their positions. The aggregate reported sell value was $12.0B.

Are there any notable investors adding CSGP to their portfolios?

Yes, buying activity remains notable. 113 institutions opened new positions in {ticker}, and 310 existing holders added to their shares. The total reported buy value for the quarter amounted to $9.2B.