# COSTAR GROUP INC (CSGP) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 22160N109
Page URL: https://superinvestorclub.com/stock/CSGP
Last updated: 2026-08-29T13:47:57.732Z

## Summary

As of the most recent 13F filing period, COSTAR GROUP INC (CSGP) is held by 4 tracked superinvestors with an aggregate position value of $591.7M representing 011699396875931442318110745 shares.

## Top institutional holders (4)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Chuck Akre](https://superinvestorclub.com/manager/25) | Akre Capital Management | 11699396 | $331.3M | 6.47% | 2026-06-30 |
| 2 | [Polen Capital](https://superinvestorclub.com/manager/271) | Polen Capital Management | 8759314 | $248.1M | 2.14% | 2026-06-30 |
| 3 | [Wallace Weitz](https://superinvestorclub.com/manager/82) | Weitz Investment Management | 423181 | $12.0M | 0.83% | 2026-06-30 |
| 4 | [Hillman Value Fund](https://superinvestorclub.com/manager/95) | Hillman Capital Management | 10745 | $304,298 | 0.22% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2023-09-30: 1 holders, $72.8M aggregate, 0947000 shares
- 2023-12-31: 1 holders, $76.6M aggregate, 0876500 shares
- 2024-03-31: 4 holders, $807.8M aggregate, 0726162687650020600518600 shares
- 2024-06-30: 4 holders, $742.7M aggregate, 0877042388650034201918600 shares
- 2024-09-30: 5 holders, $869.3M aggregate, 08934093126119588650042307318600 shares
- 2024-12-31: 7 holders, $1.18B aggregate, 093138803245109116270390980388987587991518600 shares
- 2025-03-31: 8 holders, $1.92B aggregate, 09313592660180032451091975000114830298599391160018600 shares
- 2025-06-30: 9 holders, $2.28B aggregate, 093092326923828324510932185683085000135606076560043270818600 shares
- 2025-09-30: 7 holders, $2.14B aggregate, 093064856380909324510930170001849729896034719850 shares
- 2025-12-31: 8 holders, $1.55B aggregate, 0961780548909363165000225910914425829575577198509020 shares
- 2026-03-31: 6 holders, $1.02B aggregate, 0125703681034827315000005170253390818557 shares
- 2026-06-30: 4 holders, $591.7M aggregate, 011699396875931442318110745 shares

## Recent congressional trades (33)

- 2026-04-14: Gilbert Cisneros (D-CA) sale $1,001 - $15,000
- 2026-03-13: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2026-01-28: Gil Cisneros (Democrat-CA) purchase $1,001 - $15,000
- 2026-01-28: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2025-12-10: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2025-12-10: Gil Cisneros (Democrat-CA) purchase $1,001 - $15,000
- 2025-11-10: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-11-03: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-10-15: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2025-10-15: Gil Cisneros (Democrat-CA) purchase $1,001 - $15,000
- 2025-09-30: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2025-09-25: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-09-22: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2025-08-13: Lisa McClain (Republican-MI) purchase $1,001 - $15,000
- 2025-07-31: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "COSTAR GROUP INC (CSGP) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/CSGP), aggregating SEC 13F, Form 4, and congressional disclosures."