Inspire Medical Systems, Inc.
Inspire Medical Systems, Inc. (INSP) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · INSP · as of Sep 30, 2025
Ownership Breakdown
342
Institutional Holders
▼ 30 vs Q2
$2.31B
Total Inst. Value
▼ $2.08B vs Q2
28.81M
Shares Outstanding
freeFloat 94.29%
31.12M
13F Shares Held
▼ 2.72M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
INSP largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. surgical & medical instruments & apparatus | 3.55M | 12.02% | 12.02% | $263.20B | Nov 12, 2025 | ▼ 326.6K |
VANGUARD GROUP INC surgical & medical instruments & apparatus | 3.00M | 10.17% | 10.17% | $222.61B | Nov 7, 2025 | ▼ 203.5K |
CITADEL ADVISORS LLC surgical & medical instruments & apparatus | 1.75M | 5.93% | 5.93% | $129.73B | Nov 14, 2025 | ▲ 1.74M |
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC surgical & medical instruments & apparatus | 1.30M | 4.40% | 4.40% | $96.28B | Nov 12, 2025 | ▲ 528.4K |
BAILLIE GIFFORD & CO surgical & medical instruments & apparatus | 1.08M | 3.67% | 3.67% | $80.46B | Oct 31, 2025 | ▼ 29.5K |
DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C) surgical & medical instruments & apparatus | 1.05M | 3.55% | 3.55% | $77.74B | Nov 14, 2025 | ▲ 907.7K |
STATE STREET CORP surgical & medical instruments & apparatus | 979.3K | 3.32% | 3.32% | $72.66B | Nov 14, 2025 | ▼ 51.6K |
BRAIDWELL LP surgical & medical instruments & apparatus | 883.7K | 3.00% | 3.00% | $65.57B | Nov 14, 2025 | ▲ 361.3K |
UBS ASSET MANAGEMENT AMERICAS INC surgical & medical instruments & apparatus | 833.6K | 2.83% | 2.83% | $61.85B | Nov 14, 2025 | ▲ 225.3K |
FMR LLC surgical & medical instruments & apparatus | 749.3K | 2.54% | 2.54% | $55.60B | Nov 13, 2025 | ▼ 1.54M |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
28
Increased
+7.13M shares4
New Positions
first time holders18
Decreased
−4.94M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.20M
+7.13M / −4.94M
Net new holders
+14
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
INSP insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
12
Buy transactions
3
Sell transactions
4.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Rondoni John See Remarks | May 15, 2026 | Sale | 2,641 | $43.28 | $114.3K | 27.2K | Form 4 ↗ |
Rondoni John See Remarks | May 14, 2026 | Sale | 700 | $43.01 | $30.1K | 29.8K | Form 4 ↗ |
mcCormick Shawn director | May 8, 2026 | Sale | 696 | $45.31 | $31.5K | 27.7K | Form 4 ↗ |
Ellis Gary Lee director | Apr 30, 2026 | Award | 3,562 | — | — | 10.8K | Form 4 ↗ |
Mead Dana G Jr. director | Apr 30, 2026 | Award | 3,562 | — | — | 26.2K | Form 4 ↗ |
Tansey Casey M director | Apr 30, 2026 | Award | 3,562 | — | — | 26.3K | Form 4 ↗ |
Curet Myriam director | Apr 30, 2026 | Award | 3,562 | — | — | 6.9K | Form 4 ↗ |
Burks Cynthia director | Apr 30, 2026 | Award | 3,562 | — | — | 6.2K | Form 4 ↗ |
Broader Shelley G director | Apr 30, 2026 | Award | 3,562 | — | — | 8.5K | Form 4 ↗ |
mcCormick Shawn director | Apr 30, 2026 | Award | 3,562 | — | — | 28.4K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Inspire Medical Systems, Inc. (INSP) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 5.71%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Inspire Medical Systems, Inc. is BLACKROCK, INC., holding approximately 3.55 million shares — equal to 12.02% of outstanding shares — as of September 30, 2025.
A total of 342 institutional investors currently hold INSP stock, with a combined institutional value of approximately $2.31 billion as of the most recent 13F filing period.
Frequently asked questions
INSP ownershipInspire Medical Systems, Inc. (INSP) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is BLACKROCK, INC. with a 12.02% stake. Company insiders hold 5.71%. Data sourced from SEC Form 13F as of September 30, 2025.