COSTAR GROUP INC (CSGP) Institutional Shareholders
COSTAR GROUP INC (CSGP) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $12.34B in CSGP holdings during the latest filing period.
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 $1.10B, representing an estimated gain of +2.72% 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
739
Total Reported Value
$12.34B
Largest Holder
Vanguard Portfolio Management Llc
Largest Position
$1.07B
Insider Transactions (90d)
13
Latest Filing Quarter
Q2 2026
New Institutional Positions
52
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 | $1,102,942,812 | +$29,194,430 | +2.72% | |
| Blackrock, Inc. | 0.01% | 33,813,969 | $957,611,618 | $983,648,358 | +$26,036,740 | +2.72% | |
| Vanguard Capital Management Llc | 0.02% | 26,683,792 | $755,684,989 | $776,231,509 | +$20,546,520 | +2.72% | |
| Bamco Inc | 0.92% | 21,626,763 | $612,469,928 | $629,122,536 | +$16,652,608 | +2.72% | |
| Banque Cantonale Vaudoise | 0.08% | 19,567 | $554,000,000 | $569,204 | -$553,430,796 | -99.90% | |
| State Street Corp | 0.02% | 18,410,876 | $521,396,008 | $535,572,383 | +$14,176,375 | +2.72% | |
| Capital International Investors | 0.10% | 16,643,016 | $471,330,213 | $484,145,335 | +$12,815,122 | +2.72% | |
| Baillie Gifford & Co | 0.34% | 13,154,165 | $372,525,953 | $382,654,660 | +$10,128,707 | +2.72% | |
| Geode Capital Management, Llc | 0.02% | 12,166,469 | $343,303,615 | $353,922,583 | +$10,618,968 | +3.09% | |
| Akre Capital Management | Chuck Akre | 6.49% | 11,699,396 | $331,326,895 | $340,335,430 | +$9,008,535 | +2.72% |
| Janus Henderson Group Plc | 0.15% | 7,724,152 | $311,585,948 | $224,695,582 | -$86,890,366 | -27.89% | |
| Polen Capital Management | David M. Polen | 2.14% | 8,759,314 | $248,063,762 | $254,808,444 | +$6,744,682 | +2.72% |
| Aqr Capital Management Llc | 0.08% | 8,445,474 | $239,175,807 | $245,678,839 | +$6,503,032 | +2.72% | |
| Invesco Ltd. | 0.02% | 6,808,377 | $192,813,237 | $198,055,687 | +$5,242,450 | +2.72% | |
| Edgepoint Investment Group Inc. | 1.27% | 5,950,002 | $168,504,057 | $173,085,558 | +$4,581,501 | +2.72% | |
| Norges Bank | 0.02% | 5,949,912 | $168,501,508 | $173,082,940 | +$4,581,432 | +2.72% | |
| Morgan Stanley | 0.01% | 5,485,870 | $155,359,900 | $159,583,958 | +$4,224,058 | +2.72% | |
| Meritage Group | Nathaniel Simons | 5.89% | 5,394,164 | $152,762,724 | $156,916,231 | +$4,153,507 | +2.72% |
| Jpmorgan Chase & Co | 0.01% | 4,939,994 | $145,370,301 | $143,704,425 | -$1,665,876 | -1.15% | |
| Goldman Sachs Group Inc | 0.02% | 5,129,484 | $145,266,974 | $149,216,690 | +$3,949,716 | +2.72% | |
| Federated Hermes, Inc. | 0.18% | 4,426,727 | $125,364,908 | $128,773,488 | +$3,408,580 | +2.72% | |
| Capital Research Global Investors | 0.02% | 4,193,733 | $118,785,369 | $121,995,693 | +$3,210,324 | +2.70% | |
| Ensign Peak Advisors, Inc | 0.21% | 2,734,289 | $110,301,218 | $79,540,467 | -$30,760,751 | -27.89% | |
| Principal Financial Group Inc | 0.05% | 3,790,794 | $107,356,012 | $110,274,197 | +$2,918,185 | +2.72% | |
| Bares Capital Management | Brian Bares | 9.54% | 1,226,251 | $103,458,797 | $35,671,642 | -$67,787,155 | -65.52% |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.02% | 2,425,693 | $97,852,455 | $70,563,409 | -$27,289,046 | -27.89% | |
| Northern Trust Corp | 0.01% | 3,448,839 | $97,671,120 | $100,326,727 | +$2,655,607 | +2.72% | |
| Qube Research & Technologies Ltd | 0.10% | 3,218,369 | $91,144,210 | $93,622,354 | +$2,478,144 | +2.72% | |
| Bnp Paribas Asset Management Holding S.A. | 0.09% | 3,136,727 | $88,857,875 | $91,247,388 | +$2,389,513 | +2.69% | |
| Van Eck Associates Corp | 0.05% | 3,078,903 | $87,194,534 | $89,565,288 | +$2,370,754 | +2.72% | |
| Massachusetts Financial Services Co | 0.03% | 2,983,969 | $84,506,002 | $86,803,658 | +$2,297,656 | +2.72% | |
| Charles Schwab Investment Management Inc | 0.01% | 2,962,442 | $83,896,357 | $86,177,438 | +$2,281,081 | +2.72% | |
| Bank Of America Corp | 0.00% | 2,735,102 | $77,458,084 | $79,564,117 | +$2,106,033 | +2.72% | |
| Spyglass Capital Management Llc | 4.13% | 2,694,697 | $76,313,819 | $78,388,736 | +$2,074,917 | +2.72% | |
| Canada Pension Plan Investment Board | 0.04% | 2,481,641 | $70,280,073 | $72,190,937 | +$1,910,864 | +2.72% | |
| Fmr Llc | 0.00% | 2,474,902 | $70,089,230 | $71,994,899 | +$1,905,669 | +2.72% | |
| Nomura Asset Management International Inc. | 0.10% | 2,403,003 | $68,053,000 | $69,903,357 | +$1,850,357 | +2.72% | |
| Ubs Group Ag | 0.01% | 2,328,376 | $65,939,609 | $67,732,458 | +$1,792,849 | +2.72% | |
| Vanguard Fiduciary Trust Co | 0.01% | 2,297,974 | $65,078,624 | $66,848,064 | +$1,769,440 | +2.72% | |
| Deutsche Bank Ag\ | 0.02% | 2,264,379 | $64,127,213 | $65,870,785 | +$1,743,572 | +2.72% | |
| Bank Of Montreal | 0.02% | 2,209,141 | $62,562,873 | $64,263,912 | +$1,701,039 | +2.72% | |
| Jane Street Group, Llc | 0.04% | 2,162,322 | $61,236,959 | $62,901,947 | +$1,664,988 | +2.72% | |
| Bank Of New York Mellon Corp | 0.01% | 2,005,395 | $56,792,795 | $58,336,941 | +$1,544,146 | +2.72% | |
| Erste Asset Management Gmbh | 0.39% | 1,700,000 | $49,844,000 | $49,453,000 | -$391,000 | -0.78% | |
| Thompson Siegel & Walmsley Llc | 0.89% | 1,744,040 | $49,391,000 | $50,734,124 | +$1,343,124 | +2.72% | |
| Legal & General Group Plc | 0.01% | 1,682,774 | $47,656,158 | $48,951,896 | +$1,295,738 | +2.72% | |
| Bnp Paribas Financial Markets | 0.02% | 1,578,322 | $44,698,079 | $45,913,387 | +$1,215,308 | +2.72% | |
| Hsbc Holdings Plc | 0.02% | 1,570,774 | $44,546,042 | $45,693,816 | +$1,147,774 | +2.58% | |
| Fiera Capital Corp | 0.16% | 1,566,845 | $44,373,050 | $45,579,521 | +$1,206,471 | +2.72% | |
| Voloridge Investment Management, Llc | 0.19% | 1,543,483 | $43,711,439 | $44,899,920 | +$1,188,481 | +2.72% |
Frequently asked questions about CSGP
Who owns the most CSGP stock?
The largest holders of CSGP are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for COSTAR GROUP INC (CSGP).
Is CSGP widely held by superinvestors?
Many widely followed stocks like CSGP appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly CSGP is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.