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INSP · Inspire Medical Systems, Inc.

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$62.36 +1.09 (+1.78%) At close · Aug 21
Market Cap
$1.80B
Shares
28.91M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 276
Total Value: $1,660,150,298
Total Shares: 37,214,761

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 276 13F filers · Δ vs Mar 31, 2026
Top Holder
12.7%
Sep 2023 → Jun 2026 · range 9.4% – 13.5%
+2.7 pts
Top 5
34.9%
Sep 2023 → Jun 2026 · range 31.7% – 39.2%
+1.2 pts
Top 10
53.9%
Sep 2023 → Jun 2026 · range 44.3% – 53.9%
+5.0 pts
HHI
413
Sep 2023 → Jun 2026 · range 317 – 416
Broadly held+70

Quarterly Activity

vs Mar 31, 2026
New
69
Increased
96
Decreased
78
Sold Out
97
Unchanged
33
Holder count: -28
Institutional value: -8.7%
Shares held: +5.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 281
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1609550 CUSIP 457730109 13F (30d) 257 filings 237 filers Visit website Investor relations