CSGP Institutional Ownership & Shareholders
COSTAR GROUP INC (CSGP) is currently held by 735 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $12.30B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Vanguard Portfolio Management Llc is currently the largest disclosed institutional shareholder of CSGP tracked by InsiderSet, reporting ownership valued at approximately $1.07B in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $1.14B, representing an estimated gain of +6.53% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% of the total disclosed CSGP value among the investors covered in this analysis. Major shareholders include Vanguard Portfolio Management Llc, Blackrock, Inc., Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in COSTAR GROUP INC (CSGP).
This page ranks the largest institutional CSGP shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
735
Total Reported Value
$12.30B
Largest Holder
Vanguard Portfolio Management Llc
Largest Position
$1.07B
Insider Transactions (90d)
4
Latest Filing Quarter
Q2 2026
New Institutional Positions
39
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Vanguard Portfolio Management Llc | 0.05% | 37,914,844 | $1,073,748,382 | $1,143,890,843 | +$70,142,461 | +6.53% | |
| Blackrock, Inc. | 0.01% | 33,813,969 | $957,611,618 | $1,020,167,445 | +$62,555,827 | +6.53% | |
| Vanguard Capital Management Llc | 0.02% | 26,683,792 | $755,684,989 | $805,050,005 | +$49,365,016 | +6.53% | |
| Bamco Inc | 0.92% | 21,626,763 | $612,469,928 | $652,479,440 | +$40,009,512 | +6.53% | |
| Banque Cantonale Vaudoise | 0.08% | 19,567 | $554,000,000 | $590,336 | -$553,409,664 | -99.89% | |
| State Street Corp | 0.02% | 18,410,876 | $521,396,008 | $555,456,129 | +$34,060,121 | +6.53% | |
| Capital International Investors | 0.10% | 16,643,016 | $471,330,213 | $502,119,793 | +$30,789,580 | +6.53% | |
| Baillie Gifford & Co | 0.34% | 13,154,165 | $372,525,953 | $396,861,158 | +$24,335,205 | +6.53% | |
| Geode Capital Management, Llc | 0.02% | 12,166,469 | $343,303,615 | $367,062,370 | +$23,758,755 | +6.92% | |
| Akre Capital Management | Chuck Akre | 6.49% | 11,699,396 | $331,326,895 | $352,970,777 | +$21,643,882 | +6.53% |
| Janus Henderson Group Plc | 0.15% | 7,724,152 | $311,585,948 | $233,037,666 | -$78,548,282 | -25.21% | |
| Polen Capital Management | David M. Polen | 2.14% | 8,759,314 | $248,063,762 | $264,268,503 | +$16,204,741 | +6.53% |
| Aqr Capital Management Llc | 0.08% | 8,445,474 | $239,175,807 | $254,799,951 | +$15,624,144 | +6.53% | |
| Invesco Ltd. | 0.02% | 6,808,377 | $192,813,237 | $205,408,734 | +$12,595,497 | +6.53% | |
| Edgepoint Investment Group Inc. | 1.27% | 5,950,002 | $168,504,057 | $179,511,560 | +$11,007,503 | +6.53% | |
| Norges Bank | 0.02% | 5,949,912 | $168,501,508 | $179,508,845 | +$11,007,337 | +6.53% | |
| Morgan Stanley | 0.01% | 5,485,870 | $155,359,900 | $165,508,698 | +$10,148,798 | +6.53% | |
| Meritage Group | Nathaniel Simons | 5.89% | 5,394,164 | $152,762,724 | $162,741,928 | +$9,979,204 | +6.53% |
| Jpmorgan Chase & Co | 0.01% | 4,939,994 | $145,370,301 | $149,039,619 | +$3,669,318 | +2.52% | |
| Goldman Sachs Group Inc | 0.02% | 5,129,484 | $145,266,974 | $154,756,532 | +$9,489,558 | +6.53% | |
| Federated Hermes, Inc. | 0.18% | 4,426,727 | $125,364,908 | $133,554,354 | +$8,189,446 | +6.53% | |
| Capital Research Global Investors | 0.02% | 4,193,733 | $118,785,369 | $126,524,925 | +$7,739,556 | +6.52% | |
| Ensign Peak Advisors, Inc | 0.21% | 2,734,289 | $110,301,218 | $82,493,499 | -$27,807,719 | -25.21% | |
| Bares Capital Management | Brian Bares | 9.54% | 1,226,251 | $103,458,797 | $36,995,993 | -$66,462,804 | -64.24% |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.02% | 2,425,693 | $97,852,455 | $73,183,158 | -$24,669,297 | -25.21% | |
| Northern Trust Corp | 0.01% | 3,448,839 | $97,671,120 | $104,051,473 | +$6,380,353 | +6.53% | |
| Qube Research & Technologies Ltd | 0.10% | 3,218,369 | $91,144,210 | $97,098,193 | +$5,953,983 | +6.53% | |
| Bnp Paribas Asset Management Holding S.A. | 0.09% | 3,136,727 | $88,857,875 | $94,635,054 | +$5,777,179 | +6.50% | |
| Van Eck Associates Corp | 0.05% | 3,078,903 | $87,194,534 | $92,890,504 | +$5,695,970 | +6.53% | |
| Massachusetts Financial Services Co | 0.03% | 2,983,969 | $84,506,002 | $90,026,345 | +$5,520,343 | +6.53% | |
| Charles Schwab Investment Management Inc | 0.01% | 2,962,442 | $83,896,357 | $89,376,875 | +$5,480,518 | +6.53% | |
| Bank Of America Corp | 0.00% | 2,735,102 | $77,458,084 | $82,518,027 | +$5,059,943 | +6.53% | |
| Spyglass Capital Management Llc | 4.13% | 2,694,697 | $76,313,819 | $81,299,008 | +$4,985,189 | +6.53% | |
| Canada Pension Plan Investment Board | 0.04% | 2,481,641 | $70,280,073 | $74,871,109 | +$4,591,036 | +6.53% | |
| Fmr Llc | 0.00% | 2,474,902 | $70,089,230 | $74,667,793 | +$4,578,563 | +6.53% | |
| Nomura Asset Management International Inc. | 0.10% | 2,403,003 | $68,053,000 | $72,498,601 | +$4,445,601 | +6.53% | |
| Ubs Group Ag | 0.01% | 2,328,376 | $65,939,609 | $70,247,104 | +$4,307,495 | +6.53% | |
| Vanguard Fiduciary Trust Co | 0.01% | 2,297,974 | $65,078,624 | $69,329,876 | +$4,251,252 | +6.53% | |
| Deutsche Bank Ag\ | 0.02% | 2,264,379 | $64,127,213 | $68,316,314 | +$4,189,101 | +6.53% | |
| Bank Of Montreal | 0.02% | 2,209,141 | $62,562,873 | $66,649,784 | +$4,086,911 | +6.53% | |
| Jane Street Group, Llc | 0.04% | 2,162,322 | $61,236,959 | $65,237,255 | +$4,000,296 | +6.53% | |
| Beck Mack & Oliver Llc | 1.15% | 2,084,233 | $59,025,479 | $62,881,310 | +$3,855,831 | +6.53% | |
| Bank Of New York Mellon Corp | 0.01% | 2,005,395 | $56,792,795 | $60,502,767 | +$3,709,972 | +6.53% | |
| Douglas Lane & Associates, Llc | 0.73% | 1,980,027 | $54,252,749 | $59,737,415 | +$5,484,666 | +10.11% | |
| Erste Asset Management Gmbh | 0.39% | 1,700,000 | $49,844,000 | $51,289,000 | +$1,445,000 | +2.90% | |
| Thompson Siegel & Walmsley Llc | 0.89% | 1,744,040 | $49,391,000 | $52,617,687 | +$3,226,687 | +6.53% | |
| Legal & General Group Plc | 0.01% | 1,682,774 | $47,656,158 | $50,769,292 | +$3,113,134 | +6.53% | |
| Bnp Paribas Financial Markets | 0.02% | 1,578,322 | $44,698,079 | $47,617,975 | +$2,919,896 | +6.53% | |
| Hsbc Holdings Plc | 0.02% | 1,570,774 | $44,546,042 | $47,390,252 | +$2,844,210 | +6.38% | |
| Fiera Capital Corp | 0.16% | 1,566,845 | $44,373,050 | $47,271,714 | +$2,898,664 | +6.53% |
Frequently asked questions about CSGP
Who are the largest institutional holders of CSGP?
The largest institutional holders of CSGP reported in the latest SEC Form 13F filings include Vanguard Portfolio Management Llc, Blackrock, Inc., Vanguard Capital Management Llc, Bamco Inc, and Banque Cantonale Vaudoise. InsiderSet ranks institutional holders by their latest reported CSGP position.
What is CSGP institutional ownership?
This page tracks CSGP positions reported by institutional investment managers through SEC Form 13F. COSTAR GROUP INC (CSGP) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own CSGP?
InsiderSet currently tracks 735 institutional managers reporting CSGP holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of CSGP shareholders.
How much CSGP stock do institutions own?
Institutional investment managers disclosed approximately $12.30B in CSGP holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was CSGP institutional ownership last updated?
The latest CSGP institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional CSGP holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its CSGP position after the reporting date.
Are institutions buying or selling CSGP?
Institutional buying and selling can be analyzed by comparing CSGP positions across consecutive 13F reporting periods. InsiderSet's CSGP Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View CSGP ownership changes.
How has CSGP institutional ownership changed over time?
InsiderSet tracks CSGP institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.