Ticker · CUSIP 457730109

INSP

INSPIRE MED SYS INC
Healthcare·Medical Devices
···Share
Holders (tracked)
19
Combined shares
5,759,961
Combined value
$502.85M
Last close
$56.45
Quarter
2025Q4
Tracked holders · last 8 quarters
+6 vs previous quarter over the last 8.
19172024Q12025Q4
Price is -35.3% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

25 events
  1. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +112,873 shares · 2025Q4
    13F
  2. Ken Griffin (Citadel Advisors) trimmed2026-02-17
    −1,237,091 shares · 2025Q4
    13F
  3. AQR Capital Management trimmed2026-02-17
    −22,377 shares · 2025Q4
    13F
  4. Ron Baron (Baron Capital / BAMCO) added2026-02-17
    +147,463 shares · 2025Q4
    13F
  5. Two Sigma Investments added2026-02-17
    +22,363 shares · 2025Q4
    13F
  6. D.E. Shaw & Co. added2026-02-17
    +853,305 shares · 2025Q4
    13F
  7. Izzy Englander (Millennium Mgmt) trimmed2026-02-17
    −154,668 shares · 2025Q4
    13F
  8. Steve Cohen (Point72) exited2026-02-17
    −91,896 shares · 2025Q4
    13F
  9. T. Rowe Price added2026-02-17
    +283,243 shares · 2025Q4
    13F
  10. Wellington Management opened position2026-02-17
    +2,211,091 shares · 2025Q4
    13F
  11. Ray Dalio (Bridgewater Associates) trimmed2026-02-13
    −17,225 shares · 2025Q4
    13F
  12. Renaissance Technologies added2026-02-12
    +255,768 shares · 2025Q4
    13F
  13. Norges Bank (Norway SWF) opened position2026-02-10
    +129,570 shares · 2025Q4
    13F
  14. Baillie Gifford & Co exited2026-01-23
    −1,084,350 shares · 2025Q4
    13F
  15. Two Sigma Investments added2025-11-14
    +17,802 shares · 2025Q3
    13F
  16. D.E. Shaw & Co. added2025-11-14
    +344,635 shares · 2025Q3
    13F
  17. AQR Capital Management trimmed2025-11-14
    −71,993 shares · 2025Q3
    13F
  18. Izzy Englander (Millennium Mgmt) opened position2025-11-14
    +356,808 shares · 2025Q3
    13F
  19. Steve Cohen (Point72) added2025-11-14
    +16,491 shares · 2025Q3
    13F
  20. T. Rowe Price trimmed2025-11-14
    −38,710 shares · 2025Q3
    13F
  21. Ron Baron (Baron Capital / BAMCO) trimmed2025-11-14
    −301,729 shares · 2025Q3
    13F
  22. Renaissance Technologies added2025-11-13
    +28,200 shares · 2025Q3
    13F
  23. Norges Bank (Norway SWF) exited2025-11-13
    −239,390 shares · 2025Q3
    13F
  24. Ray Dalio (Bridgewater Associates) trimmed2025-11-13
    −52,695 shares · 2025Q3
    13F
  25. Baillie Gifford & Co trimmed2025-10-31
    −29,538 shares · 2025Q3
    13F

Insider activity

Last 30 days
Net (open-market)
$0
Buys
0 · $0
Sells
0 · $0
Unique insiders
4
DateInsiderCodeSharesPriceValue
04-15Ellis Gary Lee
Director
A518$52.07$27.0K
04-15Broader Shelley G
Director
A342$52.07$17.8K
04-15Melenikiotou Georgia
Director
A307$52.07$16.0K
04-15Tansey Casey M
Director
A308$52.07$16.0K
View full insider history for INSP →
Follow-the-investor returns
If you'd copied each holder of INSP…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
T. Rowe Price2018Q4$5.96+847.2%$17.4M
Izzy Englander (Millennium Mgmt)2018Q2$77.95-27.6%$5.7M
Izzy Englander (Millennium Mgmt)2018Q2$77.95-27.6%$5.7M
D.E. Shaw & Co.2018Q3$88.07-35.9%$68.4M
Ken Griffin (Citadel Advisors)2019Q1$91.70-38.4%$28.9M
Ken Griffin (Citadel Advisors)2019Q1$91.70-38.4%$28.9M
Ken Griffin (Citadel Advisors)2019Q1$91.70-38.4%$28.9M
Paul Tudor Jones (Tudor Investment)2018Q4$93.50-39.6%$175K
Paul Tudor Jones (Tudor Investment)2018Q4$93.50-39.6%$175K
Paul Tudor Jones (Tudor Investment)2018Q4$93.50-39.6%$175K
Renaissance Technologies2019Q2$97.26-42.0%$23.2M
Ron Baron (Baron Capital / BAMCO)2019Q1$102.19-44.8%$19.1M
Wellington Management2018Q2$102.83-45.1%$124.8M
Two Sigma Investments2018Q2$107.65-47.6%$3.4M
Ray Dalio (Bridgewater Associates)2021Q1$146.12-61.4%$4.0M
AQR Capital Management2019Q2$183.62-69.3%$1.5M
Steve Cohen (Point72)2019Q1$186.51-69.7%$237K
Steve Cohen (Point72)2019Q1$186.51-69.7%$237K
Norges Bank (Norway SWF)2019Q2$3374.21-98.3%$7.3M

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions3
Added to5
Trimmed4
Exited2

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
19
$44.71B
2022Q2
17
$36.04B
2022Q3
22
$44.8M
2022Q4
20
$1.32B
2023Q1
22
$1.07B
2023Q2
23
$1.41B
2023Q3
21
$830.2M
2023Q4
18
$892.3M
2024Q1
17
$1.43B
2024Q2
21
$899.1M
2024Q3
20
$1.01B
2024Q4
18
$477.1M
2025Q1
17
$425.0M
2025Q2
16
$315.4M
2025Q3
13
$316.8M
2025Q4
19
$502.8M

Who owns INSP

19 super-investors · 2025Q4
Tracked stake
5.76M
shares
Combined value
$503M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New5Added5Trim7Sold2
#ManagerSharesValue
1Wellington Management2.21M$204M
2D.E. Shaw & Co.1.21M$112M
3Ken Griffin
Citadel Advisors
511.3K$47M
4Renaissance Technologies410.8K$38M
5Ron Baron
Baron Capital / BAMCO
337.5K$31M
6Izzy Englander
Millennium Mgmt
202.1K$19M
7Norges Bank
Norway SWF
129.6K$12M
8Paul Tudor Jones
Tudor Investment
112.9K$10M
9Izzy Englander
Millennium Mgmt
100.2K$9M
10Ray Dalio
Bridgewater Associates
71.7K$7M
11Two Sigma Investments59.5K$5M
12Ken Griffin
Citadel Advisors
35.3K$3M
13AQR Capital Management27.0K$2M
14Ken Griffin
Citadel Advisors
15.8K$1M
15Steve Cohen
Point72
4.4K$406K
16Steve Cohen
Point72
4.2K$387K
17Paul Tudor Jones
Tudor Investment
3.1K$286K
18Paul Tudor Jones
Tudor Investment
3.1K$286K
19T. Rowe Price308.2K$28K

Recent moves

20 transactions
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