Costar Group, Inc
Held by 11 tracked managers as of Q2 2026 · CUSIP ⓘCUSIP: A 9-character ID for one specific security - one share class of one company, or one bond. Tickers can change and can mean different things in different countries; a CUSIP always identifies exactly the same security, which is why filings use it. Guide 22160N109 · Sector ⓘGICS sectors: The 11-sector system most investors know (Global Industry Classification Standard): Technology, Health Care, Financials and so on. This site assigns each company a GICS-style sector from its SIC code, with a few hand corrections, so sector pages match the names investors expect. Guide
In plain English: 11 of the investors we track own this stock. In the latest quarter, 6 of them bought more of it and 7 sold some or all of theirs (2 bought it for the first time). That tells you what they did last quarter — not what the stock will do next.
Educational and informational only, not personalized investment advice. Based on public filings that may be delayed or contain errors; verify with the original filings. Disclaimer
Managers holding
11
-1 vs last quarter (like-for-like)
Total value held
$1.84B
Across tracked managers
Average weight ⓘOn average, how big this stock is in the portfolios that own it (its share of each manager's reported portfolio value).
0.9%
Of each manager's book
QoQ value ⓘLike-for-like: only managers that filed both quarters are compared, so a manager filing late (or confidentially) does not look like buying or selling. Includes price changes.
-$854.33M
-33.8% vs last quarter
Net shares bought
-3.6M
Est. net flow -$129.91M
Quarter activity
6 bought · 7 sold
2 new · 3 sold out
Tracked capital in this stock
Total value held (area) and number of managers (line). Dips can mean a large holder filed that quarter confidentially (e.g. Norges Bank in Q1/Q3).
Aggregate buying and selling
Net share change reported each quarter
Who owns CSGP?
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Who owns CSGP? — Q2 2026
Holders ranked by position size, with each one's quarter-over-quarter change.
Column filters
| # | Manager | Fund | Shares | Value | % of their portfolio ↓ | QoQ | Δ shares | Δ shares % | Est. Δ value ⓘChange in shares × this quarter's price |
|---|---|---|---|---|---|---|---|---|---|
| 3 | Chuck Akre | Akre Capital Management | 11.70M | $331.33M | 6.5% | Added | +1.4M | +13.1% | +$38.26M |
| 4 | Polen Capital | Polen Capital Management | 8.76M | $248.06M | 2.1% | Reduced | -3.8M | -30.3% | -$107.93M |
| 1 | Ron Baron | Baron Capital (BAMCO) | 21.63M | $612.47M | 0.9% | Added | +5.3M | +32.6% | +$150.45M |
| 2 | Baillie Gifford | Baillie Gifford & Co | 13.15M | $372.53M | 0.3% | Reduced | -456.8K | -3.4% | -$12.94M |
| 6 | Two Sigma | Two Sigma Investments | 1.10M | $31.29M | 0.0% | Added | +801.9K | +264.7% | +$22.71M |
| 7 | David Shaw | D.E. Shaw & Co. | 1.04M | $29.55M | 0.0% | Reduced | -4.9M | -82.3% | -$137.81M |
| 5 | Norges Bank | Norges Bank Investment Management | 5.95M | $168.50M | 0.0% | — | — | — | — |
| 8 | Israel Englander | Millennium Management | 747.00K | $21.15M | 0.0% | Added | +623.4K | +504.4% | +$17.65M |
| 9 | Ken Griffin | Citadel Advisors | 741.90K | $21.01M | 0.0% | Reduced | -346.3K | -31.8% | -$9.81M |
| 10 | Steve Cohen | Point72 Asset Management | 130.62K | $3.70M | 0.0% | New | +130.6K | — | +$3.70M |
| 11 | Jeremy Grantham | GMO | 24.56K | $695.65K | 0.0% | New | +24.6K | — | +$695.65K |
Column filters
| Manager | Fund | Shares sold | Value last quarter ↓ |
|---|---|---|---|
| Chase Coleman | Tiger Global Management | -1.5M | $60.51M |
| Keith Meister | Corvex Management | -851.7K | $34.36M |
| Select Equity Group | Select Equity Group | -767 | $30.94K |
Politician trades
Column filters
| Politician | Date | Ticker | Asset | Type | Reported range ⓘThe dollar range the politician reported. Exact amounts are not disclosed. | Est. size ⓘOur estimate only: the midpoint of the reported range. | Owner | Account ⓘSubholding Of: the account the trade was in, as named on the report (e.g. an IRA or a brokerage account). The same stock bought on the same day in different accounts is a separate trade in each account. | Filed ↓ | Filing delay ⓘDays between the trade and the report. Over 45 days is late under the STOCK Act. | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Gil Cisneros Politician | Aug 19, 2026 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Sep 10, 2026 | 22 days | PTR ↗ |
| Ro Khanna Politician | Jun 16, 2026 | CSGP | COSTAR GROUP, INC, CMIN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Jul 6, 2026 | 20 days | PTR ↗ |
| Ro Khanna Politician | Jun 30, 2026 | CSGP | COSTAR GROUP, INC. CMIN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Jul 6, 2026 | 6 days | PTR ↗ |
| Ro Khanna Politician | May 27, 2026 | CSGP | COSTAR GROUP, INC. CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Jun 9, 2026 | 13 days | PTR ↗ |
| Ro Khanna Politician | Apr 13, 2026 | CSGP | COSTAR GROUP, INC. CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | May 11, 2026 | 28 days | PTR ↗ |
| Ro Khanna Politician | Apr 24, 2026 | CSGP | COSTAR GROUP, INC. CMN scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | May 11, 2026 | 17 days | PTR ↗ |
| Gil Cisneros Politician | Apr 14, 2026 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | May 8, 2026 | 24 days | PTR ↗ |
| Gil Cisneros Politician | Mar 13, 2026 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Apr 7, 2026 | 25 days | PTR ↗ |
| Gil Cisneros Politician | Jan 28, 2026 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Feb 13, 2026 | 16 days | PTR ↗ |
| Ro Khanna Politician | Jan 6, 2026 | CSGP | COSTAR GROUP, INC. CMIN scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Feb 6, 2026 | 31 days | PTR ↗ |
| Ro Khanna Politician | Jan 29, 2026 | CSGP | COSTAR GROUP, INC, CMIN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Feb 6, 2026 | 8 days | PTR ↗ |
| Ro Khanna Politician | Jan 13, 2026 | CSGP | COSTAR GROUP, INC. CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Feb 6, 2026 | 24 days | PTR ↗ |
| Gil Cisneros Politician | Dec 10, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Jan 12, 2026 | 33 days | PTR ↗ |
| Ro Khanna Politician | Dec 5, 2025 | CSGP | COSTAR GROUP, INC. CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Jan 6, 2026 | 32 days | PTR ↗ |
| Ro Khanna Politician | Dec 12, 2025 | CSGP | COSTAR GROUP, INC. CMN scanned | Purchase | — | — | Spouse | — | Jan 6, 2026 | 25 days | PTR ↗ |
| Ro Khanna Politician | Nov 3, 2025 | CSGP | CMN COSTAR GROUP, INC. CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Dec 8, 2025 | 35 days | PTR ↗ |
| Gil Cisneros Politician | Oct 15, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Nov 18, 2025 | 34 days | PTR ↗ |
| Lisa McClain Politician | Sep 25, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | Charles Schwab Brokerage Account 924 | Oct 22, 2025 | 27 days | PTR ↗ |
| Gil Cisneros Politician | Sep 30, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Oct 10, 2025 | 10 days | PTR ↗ |
| Gil Cisneros Politician | Sep 22, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Oct 10, 2025 | 18 days | PTR ↗ |
| Lisa McClain Politician | Aug 13, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | Charles Schwab Brokerage Account 924 | Sep 12, 2025 | 30 days | PTR ↗ |
| Gil Cisneros Politician | Jul 31, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Aug 14, 2025 | 14 days | PTR ↗ |
| Gil Cisneros Politician | Jul 9, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | — | Aug 14, 2025 | 36 days | PTR ↗ |
| Gil Cisneros Politician | Jun 27, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $15,001 - $50,000 | Est. $32,500 (midpoint of reported range $15,001–$50,000) | Self | 150 Main Street Trust > Bank of America | Jul 10, 2025 | 13 days | PTR ↗ |
| Gil Cisneros Politician | Jun 30, 2025 | CSGP | CoStar Group, Inc. - Common Stock (CSGP) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | 150 Main Street Trust > Bank of America | Jul 10, 2025 | 10 days | PTR ↗ |