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Who owns Costar Group (CSGP) stock

722 funds reported Costar Group (CSGP) shares in their latest 13F filings, worth $16.5B in all. The largest holder is Vanguard Group ($4.7B). Last quarter 373 funds added to their stakes and 374 cut them. Members of Congress and other officials disclosed 5 trades (4 buys, 1 sales).

Largest holders of CSGP (13F)Largest holders of CSGP (13F)Vanguard Group$4.7BVanguard Portfolio Management LLC$1.1BBlackRock$958MVanguard Capital Management LLC$756MBamco$612MState Street$521MCapital International Investors$471MBaillie Gifford$373MGeode Capital Management, LLC$343MAkre Capital Management LLC$331M

Largest holders (13F)

FundSharesValueChangeQuarter
Vanguard Group70,108,999$4.7Bincrease2025-12-31
Vanguard Portfolio Management LLC37,914,844$1.1Bdecrease2026-06-30
BlackRock33,813,969$958Mincrease2026-06-30
Vanguard Capital Management LLC26,683,792$756Mdecrease2026-06-30
Bamco21,626,763$612Mincrease2026-06-30
State Street18,410,876$521Mdecrease2026-06-30
Capital International Investors16,643,016$471Mincrease2026-06-30
Baillie Gifford13,154,165$373Mdecrease2026-06-30
Geode Capital Management, LLC12,166,469$343Mdecrease2026-06-30
Akre Capital Management LLC11,699,396$331Mincrease2026-06-30
Janus Henderson Group7,724,152$312Mincrease2026-03-31
Polen Capital Management LLC8,759,314$248Mdecrease2026-06-30
AQR Capital Management LLC8,445,474$239Mincrease2026-06-30
Jupiter Topco LLC7,832,860$222Mbase2026-06-30
Invesco6,808,377$193Mdecrease2026-06-30

Trades by Congress and other officials

DateWhoTradeAmount
2026-08-19Gilbert Cisnerospurchase$1K–$15K
2026-04-14Gilbert Cisnerospartial sale$1K–$15K
2026-03-13Gilbert Cisnerospurchase$1K–$15K
2026-01-28Gilbert Cisnerospurchase$1K–$15K
2025-12-10Gilbert Cisnerospurchase$1K–$15K

Costar Group's latest quarter

Costar Group, Q3 2026: revenue $952M (+14% year over year), operating margin 8.8%, net earnings $74.0M, operating cash flow $188M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most CSGP stock?

By the latest 13F filings: Vanguard Group ($4.7B); Vanguard Portfolio Management LLC ($1.1B); BlackRock ($958M); Vanguard Capital Management LLC ($756M); Bamco ($612M).

Has Congress traded CSGP stock?

Officials disclosed 5 trades on file: 4 buys and 1 sales. The latest: Gilbert Cisneros, purchase on 2026-08-19.

What is the short interest in CSGP?

14,988,751 shares were sold short at the 2026-10-15 settlement, 12.83% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.