CoStar Group
CSGP
873 hedge funds and large institutions have $34.2B invested in CoStar Group in 2025 Q2 according to their latest regulatory filings, with 99 funds opening new positions, 356 increasing their positions, 316 reducing their positions, and 74 closing their positions.
85% more call options, than puts
Call options by funds: $180M | Put options by funds: $97.5M
34% more first-time investments, than exits
New positions opened: 99 | Existing positions closed: 74
13% more funds holding in top 10
Funds holding in top 10: 23 → 26 (+3)
13% more repeat investments, than reductions
Existing positions increased: 356 | Existing positions reduced: 316
2% more funds holding
Funds holding: 858 → 873 (+15)
1% more capital invested
Capital invested by funds: $34B → $34.2B (+$219M)
0.98% less ownership
Funds ownership: 101.68% → 100.7% (-0.98%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Janus Henderson Group
London,
|
+$310M |
| 2 |
Viking Global Investors
Stamford,
Connecticut
|
+$251M |
| 3 |
Franklin Resources
San Mateo,
California
|
+$111M |
| 4 |
TP
Third Point
New York
|
+$86.5M |
| 5 |
IAM
Ion Asset Management
Herzliya,
Israel
|
+$80.2M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
TCIM
TOMS Capital Investment Management
New York
|
-$278M |
| 2 |
BlackRock
New York
|
-$188M |
| 3 |
MMA
Mizuho Markets Americas
New York
|
-$120M |
| 4 |
Ameriprise
Minneapolis,
Minnesota
|
-$113M |
| 5 |
Macquarie Group
Sydney, NSW 2000,
Australia
|
-$105M |
CSGP Hedge Fund Activity: Q2 2025 in Review
873 of the 7,613 institutional investors tracked by Wall St. Rank reported a position in CoStar Group (CSGP) for Q2 2025, worth a combined $34.2B — up 0.65% from $34B a quarter earlier.
Buyers outnumbered sellers: 99 funds opened new CSGP positions and 74 closed out — a net gain of 25 holders — while 356 added to existing stakes and 316 trimmed.
The largest buyer was Janus Henderson Group, adding an estimated $310M. The largest seller was TOMS Capital Investment Management, exiting entirely with an estimated $278M sold.
- 873 institutional investors held CoStar Group (CSGP) as of Q2 2025, up from 858 in Q1 2025.
- Funds reported $34.2B of CoStar Group stock for Q2 2025, up 0.65% quarter-over-quarter.
- 99 funds opened new CoStar Group positions in Q2 2025 and 74 closed out, a net change of +25 holders.
- The largest CoStar Group buyer in Q2 2025 was Janus Henderson Group, an estimated $310M added.
- The largest CoStar Group seller in Q2 2025 was TOMS Capital Investment Management, an estimated $278M sold.
Based on aggregated 13F filings for Q2 2025.