Insider trade

CEO purchased ~$2.49M of CSGP shares in the open market

Traded Aug 4, 2026 · Filed Aug 5, 2026

CoStar GroupCSGP

~$2.49M
Reported value · 83K sh @ $29.89: 1.81M
Holds after · shares reported: -7.0%
stock since the trade · S&P 500 -0.9%, $29.815 → $27.72 on Oct 1

Why it stands out

The boss of CoStar Group spent $2.49M of their very own money to buy CoStar Group shares.

Written from the filing's own figures. OQRO describes what was reported and never tells you what to buy or sell

View the official recordSEC Form 4 — Statement of Changes in Beneficial Ownership

All the details

Dates, kept separate

Transaction date: Aug 4, 2026
Reporting period: Not applicable
Filed with the SEC: Aug 5, 2026

CEO$1M+Holdings +5%Largest by this insider

Context

Classification

open market purchase

Code P — open-market or private purchase

Absolute commitment

~$2,489,837

Shares × reported transaction price

Size band

$1M+

Ownership change

+4.8%

Purchase shares ÷ estimated pre-transaction holdings, from the filing

Rarity

First purchase in 3 months

Confirmed open-market purchases by the same insider in the available history

Largest by this insider

Yes

Compared with 3 earlier confirmed purchases

Cluster activity

No other insider purchases within 30 days

Distinct insiders at the same issuer with confirmed open-market purchases

Size vs CEO pay

This purchase equals about 6.8% of the CEO's reported total pay for fiscal 2025 ($36.4M)

Purchase value ÷ the CEO's total from the Summary Compensation Table, as tagged in the pay versus performance table of the company's proxy statement (DEF 14A), filed 2026-04-30. The proxy names Andrew C. Florance as CEO for that year. A size comparison, not a judgement

Timing vs results

7 days after results of Jul 28, 2026

Results dates are the company's own 8-K (Item 2.02). Many companies only let insiders trade in a window after results

Price at the time

Closed at $29.815 on Aug 4, 2026, 10% above its 52-week low and 69% below its high, after a 2% rise over the previous 30 trading days

52-week range $27.14 (Jul 23, 2026) to $96.56 (Aug 5, 2025), 4% of the way up, from 251 adjusted closes. 30 trading days earlier: $29.22 on Jun 22, 2026. Describes the past only, not a forecast

Planned / mechanical clue

None found in footnotes

Only flagged when a footnote says so; never inferred

After it was reported

After	Stock	S&P 500	Difference
7 days	+11.7%	+1.2%	+10.5%
30 days	+2.6%	-0.3%	+2.9%

Past results only. Not a forecast.

Source receipt

Record ID: 0001628280-26-052968
Filed / recorded: Aug 5, 2026, 1:27 PM UTC
Added to OQRO: Oct 2, 2026, 12:27 PM UTC
Parser: form4-xml-v1
Data quality: Verified: identifiers matched exactly
Issuer: COSTAR GROUP, INC.
Issuer CIK: 1057352
Ticker: CSGP
Reporting person: Andrew C Florance
Relationship: Director, Officer
Officer title: Founder and CEO
Security: Common Stock, par value $0.01 per share
Table: Non-derivative (Table I)
Transaction date: Aug 4, 2026
Transaction code: P
Shares / units: 83,300
Price per share: $29.89
Acquired / disposed: Acquired (A)
Shares owned after: 1,806,165.03
Ownership form: Direct
Amendment: No

Footnotes from the filing

Average based on sales prices ranging from $29.57 to $29.99.

Around the same time

7w ago

5%+ stake

5.3%Stake

A Schedule 13G is filed by holders above 5% who say they will not try to influence the company. Index funds and large asset managers file most of them.

Why it stands out Official record

7w ago

Fund holdings