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Inspire Medical Systems INSP

US equityMarket cap rank #2763
$70.75 +$0.78 (+1.11%)
Pre-market · Oct 6, 7:30 am ET · After hours $70.75 0.00%
Open$69.66
Prev close$69.97
Day range$68.67 – $71.36
Volume632.1K
Market cap$2.05B
P/E (TTM)15.6
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership130.4%-0.36 pts vs. prior quarter
Institutions holding325-2 vs. prior quarter
Insider trades (recent)28 buys / 21 sellsNet buying
Short interest13.59% of floatDays to cover 4.9 · as of 15 Sep 2026
Short-sale volume share21.1%5-day average of daily volume

Short-sale volume as % of daily volume

14%19%25%31%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$6.27M (10 inflow days, 10 outflow days).

The five largest holders on file together own 46.1% of shares outstanding.

Largest holders

  • BlackRock16.39%
  • Wellington Management Group8.24%
  • UBS Asset Management7.58%
  • Vanguard Portfolio Management, LLC7.23%
  • Soleus Capital Management, L.P.6.68%
  • AQR Capital Management6.41%
  • D. E. Shaw & Co., L.P.5.09%
  • Vanguard Capital Management, LLC5.06%

By investor type

  • Mutual Fund73.91%
  • Hedge Fund36.36%
  • Public Company11.51%
  • Private Company5.67%
  • Government Pension Fund2.03%
  • Individual/Insider1.27%
  • Sovereign Wealth Fund0.69%
  • Family Office/Trust0.09%

Reported short interest has fallen from 16.29% to 13.59% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 3,928,250 13.6% 4.9
31 Aug 2026 3,656,612 12.6% 7.5
14 Aug 2026 4,373,708 15.1% 5.2
31 Jul 2026 3,920,330 13.6% 5.0
15 Jul 2026 4,344,629 15.1% 4.2
30 Jun 2026 4,694,748 16.3% 3.8

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