CoStar Group
CSGP
797 hedge funds and large institutions have $16.8B invested in CoStar Group in 2026 Q1 according to their latest regulatory filings, with 129 funds opening new positions, 309 increasing their positions, 276 reducing their positions, and 166 closing their positions.
262% more call options, than puts
Call options by funds: $142M | Put options by funds: $39.3M
12% more repeat investments, than reductions
Existing positions increased: 309 | Existing positions reduced: 276
0.65% less ownership
Funds ownership: 99.73% → 99.08% (-0.65%)
6% less funds holding
Funds holding: 847 → 797 (-50)
22% less first-time investments, than exits
New positions opened: 129 | Existing positions closed: 166
41% less capital invested
Capital invested by funds: $28.4B → $16.8B (-$11.6B)
59% less funds holding in top 10
Funds holding in top 10: 17 → 7 (-10)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Polen Capital Management
Boca Raton,
Florida
|
+$400M |
| 2 |
Goldman Sachs
New York
|
+$286M |
| 3 |
D.E. Shaw & Co
New York
|
+$261M |
| 4 |
Capital International Investors
Los Angeles,
California
|
+$243M |
| 5 |
VanEck Associates
New York
|
+$178M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
VVP
Vulcan Value Partners
Birmingham,
Alabama
|
-$302M |
| 2 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
-$233M |
| 3 |
MMA
Mizuho Markets Americas
New York
|
-$216M |
| 4 |
TP
Third Point
New York
|
-$213M |
| 5 |
BAMCO Inc
New York
|
-$166M |
CSGP Hedge Fund Activity: Q1 2026 in Review
797 of the 8,186 institutional investors tracked by Wall St. Rank reported a position in CoStar Group (CSGP) for Q1 2026, worth a combined $16.8B — down 41% from $28.4B a quarter earlier.
Sellers outnumbered buyers: 166 funds closed out of CSGP and 129 opened new positions — a net loss of 37 holders — while 276 trimmed existing stakes and 309 added.
The largest buyer was Polen Capital Management, adding an estimated $400M. The largest seller was Vulcan Value Partners, exiting entirely with an estimated $302M sold.
- 797 institutional investors held CoStar Group (CSGP) as of Q1 2026, down from 847 in Q4 2025.
- Funds reported $16.8B of CoStar Group stock for Q1 2026, down 41% quarter-over-quarter.
- 129 funds opened new CoStar Group positions in Q1 2026 and 166 closed out, a net change of -37 holders.
- The largest CoStar Group buyer in Q1 2026 was Polen Capital Management, an estimated $400M added.
- The largest CoStar Group seller in Q1 2026 was Vulcan Value Partners, an estimated $302M sold.
Based on aggregated 13F filings for Q1 2026.