Inspire Medical Systems
INSP
301 hedge funds and large institutions have $1.8B invested in Inspire Medical Systems in 2026 Q1 according to their latest regulatory filings, with 59 funds opening new positions, 120 increasing their positions, 99 reducing their positions, and 94 closing their positions.
21% more repeat investments, than reductions
Existing positions increased: 120 | Existing positions reduced: 99
4.5% more ownership
Funds ownership: 116.61% → 121.12% (+4.5%)
12% less funds holding
Funds holding: 343 → 301 (-42)
37% less first-time investments, than exits
New positions opened: 59 | Existing positions closed: 94
42% less capital invested
Capital invested by funds: $3.12B → $1.8B (-$1.33B)
71% less call options, than puts
Call options by funds: $4.94M | Put options by funds: $17M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
DM
Deerfield Management
New York
|
+$83.8M |
| 2 |
VPC
Vestal Point Capital
New York
|
+$37.8M |
| 3 |
ACM
ADAR1 Capital Management
Austin,
Texas
|
+$27.3M |
| 4 |
Goldman Sachs
New York
|
+$26.5M |
| 5 |
Wellington Management Group
Boston,
Massachusetts
|
+$22.7M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fuller & Thaler Asset Management
San Mateo,
California
|
-$61.6M |
| 2 |
Marshall Wace
London,
United Kingdom
|
-$49M |
| 3 |
EAM
Eventide Asset Management
Boston,
Massachusetts
|
-$40.6M |
| 4 |
Janus Henderson Group
London,
|
-$38.4M |
| 5 |
DCM
Driehaus Capital Management
Chicago,
Illinois
|
-$32.1M |
INSP Hedge Fund Activity: Q1 2026 in Review
301 of the 8,187 institutional investors tracked by Wall St. Rank reported a position in Inspire Medical Systems (INSP) for Q1 2026, worth a combined $1.8B — down 42% from $3.12B a quarter earlier.
Sellers outnumbered buyers: 94 funds closed out of INSP and 59 opened new positions — a net loss of 35 holders — while 99 trimmed existing stakes and 120 added.
The largest buyer was Deerfield Management, adding an estimated $83.8M. The largest seller was Fuller & Thaler Asset Management, exiting entirely with an estimated $61.6M sold.
- 301 institutional investors held Inspire Medical Systems (INSP) as of Q1 2026, down from 343 in Q4 2025.
- Funds reported $1.8B of Inspire Medical Systems stock for Q1 2026, down 42% quarter-over-quarter.
- 59 funds opened new Inspire Medical Systems positions in Q1 2026 and 94 closed out, a net change of -35 holders.
- The largest Inspire Medical Systems buyer in Q1 2026 was Deerfield Management, an estimated $83.8M added.
- The largest Inspire Medical Systems seller in Q1 2026 was Fuller & Thaler Asset Management, an estimated $61.6M sold.
Based on aggregated 13F filings for Q1 2026.