Who owns CoStar Group (CSGP)
Which tracked institutional funds hold CSGP, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CSGP company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on CSGP is one-sided between 2026-Q1 and 2026-Q2: 113 added or opened and 333 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
CSGP’s largest tracked holder by dollar value, VANGUARD PORTFOLIO MANAGEMENT LLC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CSGP divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 706 tracked filers holding CSGP, 390 increased or opened the position and 446 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in CSGP between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 33
- Jupiter Topco LLC$222M
- EdgePoint Investment Group Inc.$169M
- Qube Research & Technologies Ltd$91M
- United Asset Strategies, Inc.$14M
- JACOBS LEVY EQUITY MANAGEMENT, INC$13M
- Aquatic Capital Management LLC$6M
Full exits 77
- JANUS HENDERSON GROUP PLC$312M
- Amundi$132M
- TIGER GLOBAL MANAGEMENT LLC$61M
- Greenhouse Funds LLLP$56M
- CAPITOLIS LIQUID GLOBAL MARKETS LLC$55M
- Stephens Investment Management Group LLC$35M
Largest adds
- AQR CAPITAL MANAGEMENT LLC$189M
- FEDERATED HERMES, INC.$73M
- JPMORGAN CHASE & CO$70M
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/$45M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$35M
- Spyglass Capital Management LLC$31M
Largest trims
- PRINCIPAL FINANCIAL GROUP INC$607M
- VANGUARD PORTFOLIO MANAGEMENT LLC$469M
- VANGUARD CAPITAL MANAGEMENT LLC$351M
- POLEN CAPITAL MANAGEMENT LLC$259M
- NORGES BANK$249M
- STATE STREET CORP$231M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 37,914,844 | $1.1B | 10.1% | 2026-Q2 |
| BlackRock, Inc. added | 33,813,969 | $958M | 9.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 26,683,792 | $756M | 7.1% | 2026-Q2 |
| BAMCO INC /NY/ added | 21,626,763 | $612M | 5.7% | 2026-Q2 |
| STATE STREET CORP trimmed | 18,410,876 | $521M | 4.9% | 2026-Q2 |
| Capital International Investors added | 16,643,016 | $471M | 4.4% | 2026-Q2 |
| BAILLIE GIFFORD & CO trimmed | 13,154,165 | $373M | 3.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 12,166,469 | $343M | 3.2% | 2026-Q2 |
| AKRE CAPITAL MANAGEMENT LLC added | 11,699,396 | $331M | 3.1% | 2026-Q2 |
| POLEN CAPITAL MANAGEMENT LLC trimmed | 8,759,314 | $248M | 2.3% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 8,445,474 | $239M | 2.2% | 2026-Q2 |
| Jupiter Topco LLC new | 7,832,860 | $222M | 2.1% | 2026-Q2 |
| Invesco Ltd. trimmed | 6,808,377 | $193M | 1.8% | 2026-Q2 |
| EdgePoint Investment Group Inc. new | 5,950,002 | $169M | 1.6% | 2026-Q2 |
| NORGES BANK added | 5,949,912 | $169M | 1.6% | 2026-Q2 |
| MORGAN STANLEY added | 5,485,870 | $155M | 1.5% | 2026-Q2 |
| Meritage Group LP added | 5,394,164 | $153M | 1.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 5,129,484 | $145M | 1.4% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 4,939,994 | $145M | 1.4% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 4,426,727 | $125M | 1.2% | 2026-Q2 |
| Capital Research Global Investors trimmed | 4,193,733 | $119M | 1.1% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 3,790,794 | $107M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 3,448,839 | $98M | 0.9% | 2026-Q2 |
| Qube Research & Technologies Ltd new | 3,218,369 | $91M | 0.9% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 3,136,727 | $89M | 0.8% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP trimmed | 3,078,903 | $87M | 0.8% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 2,983,969 | $85M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 2,962,442 | $84M | 0.8% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 2,735,102 | $77M | 0.7% | 2026-Q2 |
| Spyglass Capital Management LLC added | 2,694,697 | $76M | 0.7% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 2,521,571 | $71M | 0.7% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 2,481,641 | $70M | 0.7% | 2026-Q2 |
| FMR LLC trimmed | 2,474,902 | $70M | 0.7% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 2,403,003 | $68M | 0.6% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 2,373,407 | $67M | 0.6% | 2026-Q2 |
| UBS Group AG added | 2,328,376 | $66M | 0.6% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO trimmed | 2,297,974 | $65M | 0.6% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 2,264,379 | $64M | 0.6% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 2,209,141 | $63M | 0.6% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 2,162,322 | $61M | 0.6% | 2026-Q2 |
| BECK MACK & OLIVER LLC trimmed | 2,084,233 | $59M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 2,005,395 | $57M | 0.5% | 2026-Q2 |
| Erste Asset Management GmbH added | 1,700,000 | $50M | 0.5% | 2026-Q2 |
| Legal & General Group Plc trimmed | 1,682,774 | $48M | 0.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 1,578,322 | $45M | 0.4% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 1,570,774 | $45M | 0.4% | 2026-Q2 |
| Fiera Capital Corp added | 1,566,845 | $44M | 0.4% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 1,543,483 | $44M | 0.4% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 1,535,584 | $43M | 0.4% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,515,376 | $43M | 0.4% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 1,470,824 | $42M | 0.4% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 1,467,115 | $42M | 0.4% | 2026-Q2 |
| Squarepoint Ops LLC added | 1,442,049 | $41M | 0.4% | 2026-Q2 |
| MARSHALL WACE, LLP added | 1,381,204 | $39M | 0.4% | 2026-Q2 |
| Nuveen, LLC trimmed | 1,325,564 | $38M | 0.4% | 2026-Q2 |
| DF DENT & CO INC trimmed | 1,319,009 | $37M | 0.4% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 1,299,558 | $37M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 1,253,821 | $36M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 1,183,765 | $34M | 0.3% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 1,169,688 | $33M | 0.3% | 2026-Q2 |
| Douglas Lane & Associates, LLC added | 1,168,859 | $33M | 0.3% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 1,104,950 | $31M | 0.3% | 2026-Q2 |
| RIVERBRIDGE PARTNERS LLC trimmed | 1,091,535 | $31M | 0.3% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 1,043,332 | $30M | 0.3% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. trimmed | 1,015,380 | $29M | 0.3% | 2026-Q2 |
| Focus Partners Wealth added | 936,775 | $27M | 0.2% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. trimmed | 925,120 | $26M | 0.2% | 2026-Q2 |
| Man Group plc added | 921,094 | $26M | 0.2% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. added | 902,723 | $26M | 0.2% | 2026-Q2 |
| CITIGROUP INC trimmed | 889,581 | $25M | 0.2% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 881,001 | $25M | 0.2% | 2026-Q2 |
| PRIMECAP MANAGEMENT CO/CA/ added | 821,600 | $23M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 790,116 | $22M | 0.2% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 772,828 | $22M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 762,930 | $22M | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 758,649 | $21M | 0.2% | 2026-Q2 |
| Petrus Trust Company, LTA | 756,200 | $21M | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 746,995 | $21M | 0.2% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 741,898 | $21M | 0.2% | 2026-Q2 |
| Trexquant Investment LP added | 740,241 | $21M | 0.2% | 2026-Q2 |
| AMERICAN CAPITAL MANAGEMENT INC trimmed | 725,143 | $21M | 0.2% | 2026-Q2 |
| Korea Investment CORP added | 698,417 | $20M | 0.2% | 2026-Q2 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 692,753 | $20M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 686,023 | $19M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 680,684 | $19M | 0.2% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL trimmed | 658,159 | $19M | 0.2% | 2026-Q2 |
| Gotham Asset Management, LLC added | 635,988 | $18M | 0.2% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 627,490 | $18M | 0.2% | 2026-Q2 |
| Mitsubishi UFJ Trust & Banking Corp added | 596,676 | $17M | 0.2% | 2026-Q2 |
| Quantinno Capital Management LP added | 577,996 | $16M | 0.2% | 2026-Q2 |
| Chicago Capital, LLC trimmed | 526,958 | $15M | 0.1% | 2026-Q2 |
| United Asset Strategies, Inc. new | 489,008 | $14M | 0.1% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 487,676 | $14M | 0.1% | 2026-Q2 |
| California Public Employees Retirement System trimmed | 478,042 | $14M | 0.1% | 2026-Q2 |
| NZS Capital, LLC trimmed | 475,551 | $13M | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 458,765 | $13M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 458,488 | $18M | 0.2% | 2026-Q2 |
| FORA Capital, LLC added | 443,586 | $13M | 0.1% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC new | 441,412 | $13M | 0.1% | 2026-Q2 |
| WEITZ INVESTMENT MANAGEMENT, INC. trimmed | 423,181 | $12M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.