We are live on ! Find out more
INSP icon

Inspire Medical Systems
INSP

325 hedge funds and large institutions have $2.31B invested in Inspire Medical Systems in 2025 Q3 according to their latest regulatory filings, with 66 funds opening new positions, 97 increasing their positions, 131 reducing their positions, and 94 closing their positions.

New
Increased
Maintained
Reduced
Closed

9% less funds holding

Funds holding: 356 → 325 (-31)

9.43% less ownership

Funds ownership: 114.59% → 105.16% (-9.4%)

26% less repeat investments, than reductions

Existing positions increased: 97 | Existing positions reduced: 131

30% less first-time investments, than exits

New positions opened: 66 | Existing positions closed: 94

47% less capital invested

Capital invested by funds: $4.39B → $2.31B (-$2.08B)

50% less funds holding in top 10

Funds holding in top 10: 2 → 1 (-1)

53% less call options, than puts

Call options by funds: $9.1M | Put options by funds: $19.4M

Holders
325
Holders Change
-31
Holders Change %
-8.71%
% of All Funds
4.27%
Holding in Top 10
1
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-50%
% of All Funds
0.01%
New
66
Increased
97
Reduced
131
Closed
94
Calls
$9.1M
Puts
$19.4M
Net Calls
-$10.3M
Net Calls Change
-$9.03M

Top Buyers

1
Citadel Advisors
Citadel Advisors
Florida
+$176M
2
DM
Deerfield Management
New York
+$91.9M
3
SCM
Soleus Capital Management
Connecticut
+$62.7M
4
Balyasny Asset Management
Balyasny Asset Management
Illinois
+$62.2M
5
William Blair Investment Management
William Blair Investment Management
Illinois
+$53.5M

Top Sellers

1
DIG
Dragoneer Investment Group
California
-$306M
2
Fidelity Investments
Fidelity Investments
Massachusetts
-$156M
3
WA
Wasatch Advisors
Utah
-$152M
4
TCM
TimesSquare Capital Management
New York
-$64.8M
5
FCM
Frontier Capital Management
Massachusetts
-$53.8M
Name Holding Trade Value Shares
Change 		Change in
Stake
BlackRock
1
BlackRock
New York
$263M -$33.1M -326,591 -8%
Vanguard Group
2
Vanguard Group
Pennsylvania
$223M -$20.6M -203,504 -6%
Citadel Advisors
3
Citadel Advisors
Florida
$130M +$176M +1,739,734 +20,055%
William Blair Investment Management
4
William Blair Investment Management
Illinois
$96.3M +$53.5M +528,404 +69%
Baillie Gifford & Co
5
Baillie Gifford & Co
United Kingdom
$80.5M -$2.99M -29,538 -3%
DM
6
Deerfield Management
New York
$77.7M +$91.9M +907,694 +648%
State Street
7
State Street
Massachusetts
$72.7M -$5.22M -51,593 -5%
B
8
Braidwell
Connecticut
$65.6M +$36.6M +361,337 +69%
UBS AM
9
UBS AM
Illinois
$61.9M +$22.8M +225,291 +37%
Fidelity Investments
10
Fidelity Investments
Massachusetts
$55.6M -$156M -1,536,430 -67%
SCM
11
Soleus Capital Management
Connecticut
$54M +$62.7M +619,188 +568%
Janus Henderson Group
12
Janus Henderson Group
United Kingdom
$49.5M +$2.65M +26,155 +4%
Balyasny Asset Management
13
Balyasny Asset Management
Illinois
$45.6M +$62.2M +614,359 New
Artisan Partners
14
Artisan Partners
Wisconsin
$39M +$16.6M +163,916 +45%
BNP Paribas Financial Markets
15
BNP Paribas Financial Markets
France
$38.7M +$46.8M +462,412 +774%
Geode Capital Management
16
Geode Capital Management
Massachusetts
$37.5M -$795K -7,849 -2%
UBS Group
17
UBS Group
Switzerland
$34.7M +$3.75M +37,042 +9%
Morgan Stanley
18
Morgan Stanley
New York
$33.4M +$15M +147,769 +49%
CIP
19
Champlain Investment Partners
Vermont
$30.2M -$511K -5,047 -1%
Aberdeen Group
20
Aberdeen Group
United Kingdom
$30M +$15.5M +153,238 +63%
D.E. Shaw & Co
21
D.E. Shaw & Co
New York
$26.6M +$34.9M +344,635 +2,423%
Millennium Management
22
Millennium Management
New York
$26.5M +$36.1M +356,808 New
Dimensional Fund Advisors
23
Dimensional Fund Advisors
Texas
$25.5M -$116K -1,149 -0.3%
Franklin Resources
24
Franklin Resources
California
$22.1M +$6.95M +68,681 +30%
Bank of America
25
Bank of America
North Carolina
$21.4M +$3.48M +34,354 +14%
1
2 3 4 5

INSP Hedge Fund Activity: Q3 2025 in Review

325 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Inspire Medical Systems (INSP) for Q3 2025, worth a combined $2.31B — down 47% from $4.39B a quarter earlier.

Sellers outnumbered buyers: 94 funds closed out of INSP and 66 opened new positions — a net loss of 28 holders — while 131 trimmed existing stakes and 97 added.

The largest buyer was Citadel Advisors, adding an estimated $176M. The largest seller was Dragoneer Investment Group, exiting entirely with an estimated $306M sold.

  • 325 institutional investors held Inspire Medical Systems (INSP) as of Q3 2025, down from 356 in Q2 2025.
  • Funds reported $2.31B of Inspire Medical Systems stock for Q3 2025, down 47% quarter-over-quarter.
  • 66 funds opened new Inspire Medical Systems positions in Q3 2025 and 94 closed out, a net change of -28 holders.
  • The largest Inspire Medical Systems buyer in Q3 2025 was Citadel Advisors, an estimated $176M added.
  • The largest Inspire Medical Systems seller in Q3 2025 was Dragoneer Investment Group, an estimated $306M sold.

Based on aggregated 13F filings for Q3 2025.