Inspire Medical Systems
INSP
343 hedge funds and large institutions have $3.12B invested in Inspire Medical Systems in 2025 Q4 according to their latest regulatory filings, with 93 funds opening new positions, 114 increasing their positions, 114 reducing their positions, and 69 closing their positions.
35% more capital invested
Capital invested by funds: $2.31B → $3.12B (+$816M)
35% more first-time investments, than exits
New positions opened: 93 | Existing positions closed: 69
11.45% more ownership
Funds ownership: 105.16% → 116.61% (+11%)
6% more funds holding
Funds holding: 325 → 343 (+18)
0% more repeat investments, than reductions
Existing positions increased: 114 | Existing positions reduced: 114
11% less call options, than puts
Call options by funds: $41.8M | Put options by funds: $47.2M
100% less funds holding in top 10
Funds holding in top 10: 1 → 0 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
+$212M |
| 2 |
D.E. Shaw & Co
New York
|
+$81.6M |
| 3 |
Morgan Stanley
New York
|
+$77.4M |
| 4 |
Fuller & Thaler Asset Management
San Mateo,
California
|
+$63.9M |
| 5 |
Deutsche Bank
Frankfurt Am Main Ge,
Germany
|
+$48.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
-$118M |
| 2 |
Baillie Gifford & Co
Edinburgh,
United Kingdom
|
-$80.5M |
| 3 |
Fidelity Investments
Boston,
Massachusetts
|
-$58.6M |
| 4 |
SCM
Soleus Capital Management
Greenwich,
Connecticut
|
-$41M |
| 5 |
Balyasny Asset Management
Chicago,
Illinois
|
-$40.9M |
INSP Hedge Fund Activity: Q4 2025 in Review
343 of the 8,270 institutional investors tracked by Wall St. Rank reported a position in Inspire Medical Systems (INSP) for Q4 2025, worth a combined $3.12B — up 35% from $2.31B a quarter earlier.
Buyers outnumbered sellers: 93 funds opened new INSP positions and 69 closed out — a net gain of 24 holders — while 114 added to existing stakes and 114 trimmed.
The largest buyer was Wellington Management Group, opening a new position worth an estimated $212M. The largest seller was Citadel Advisors, cutting an estimated $118M.
- 343 institutional investors held Inspire Medical Systems (INSP) as of Q4 2025, up from 325 in Q3 2025.
- Funds reported $3.12B of Inspire Medical Systems stock for Q4 2025, up 35% quarter-over-quarter.
- 93 funds opened new Inspire Medical Systems positions in Q4 2025 and 69 closed out, a net change of +24 holders.
- The largest Inspire Medical Systems buyer in Q4 2025 was Wellington Management Group, an estimated $212M added.
- The largest Inspire Medical Systems seller in Q4 2025 was Citadel Advisors, an estimated $118M sold.
Based on aggregated 13F filings for Q4 2025.