Latest Period
Q1 2026
Security Snapshot
Inspire Medical Systems, Inc. - Common Stock, $0.001 par value per share (INSP) Institutional Ownership
CUSIP: 457730109
13F Institutional Holders and Ownership History from Q2 2018 to Q1 2026
Institutions Reporting
296
Shares (Excl. Options)
34,850,977
Price
$51.58
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- Security type / class
- Equity / Common Stock, $0.001 par value per share
- Symbol
- INSP on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 34,850,977
- Total 13F value
- $1,797,502,160
- Portfolio coverage rank
- 0%
- Share change
- +1,006,897
- Value change
- -$107,821,202
- Number of holders
- 296
- Shares outstanding
- 28,838,196
- SEC-reported price per share
- $44.74
- Insider filing price
- $44.74
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- INSP - Inspire Medical Systems, Inc. - Common Stock, $0.001 par value per share is tracked under CUSIP 457730109.
- 296 institutions reported positions in Q1 2026.
- 9 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 342 to 296 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $3,125,013,462 to $1,797,502,160.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 296 institutions filings for Q1 2026.
Security key
457730109
Latest holder period
Q1 2026
13F holders
296
13D/G owners
9
CIK / CUSIP context first
Open Q1 2026 holders
INSP full holder history
Inspire Medical Systems, Inc. SEC filings
Inspire Medical Systems, Inc. company facts
Inspire Medical Systems, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 457730109:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
9
Security
INSP
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 11% | -10% | $248,822,799 | -$29,612,330 | 3,353,407 | -11% | BlackRock, Inc. | 30 Sep 2025 |
| WELLINGTON MANAGEMENT GROUP LLP | 8.8% | +15% | $137,296,550 | +$17,588,083 | 2,535,954 | +15% | Wellington Management Group LLP | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.7% | $84,837,082 | 1,644,767 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| Soleus Capital Master Fund, L.P. | 5.1% | $80,994,092 | 1,470,748 | Soleus Capital Master Fund, L.P. | 26 May 2026 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.1% | $75,807,281 | 1,469,703 | Vanguard Capital Management | 31 Mar 2026 | |||
| Flynn James E | 4.5% | -12% | $70,212,109 | -$9,714,936 | 1,296,862 | -12% | Deerfield Mgmt, L.P. | 14 May 2026 |
| FMR LLC | 2.5% | -72% | $55,005,358 | -$130,571,372 | 741,312 | -70% | FMR LLC | 30 Sep 2025 |
| CITADEL ADVISORS LLC | 1.8% | -67% | $50,085,615 | -$112,653,375 | 527,217 | -69% | Kenneth Griffin | 31 Dec 2025 |
| WASATCH ADVISORS LP | 0.5% | -92% | $10,084,819 | -$103,003,921 | 135,914 | -91% | Wasatch Advisors LP | 30 Sep 2025 |
As of 31 Mar 2026, 296 institutional investors reported holding 34,850,977 shares of Inspire Medical Systems, Inc. - Common Stock, $0.001 par value per share (INSP). This represents 121% of the company’s total 28,838,196 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
86%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 12% | 3,549,554 | -0.04% | 0% | $183,085,997 |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 9.4% | 2,703,238 | +80% | 1.6% | $139,433,016 |
| WELLINGTON MANAGEMENT GROUP LLP | 8.8% | 2,535,954 | +15% | 0.02% | $130,804,508 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.7% | 1,637,173 | 0% | 0% | $84,445,383 |
| MORGAN STANLEY | 5% | 1,450,634 | +15% | 0% | $74,823,729 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.4% | 1,266,738 | 0% | 0% | $65,338,346 |
| D. E. Shaw & Co., Inc. | 4.1% | 1,188,537 | -1.9% | 0.05% | $61,304,738 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 3.9% | 1,137,384 | -2.1% | 0.19% | $58,666,267 |
| STATE STREET CORP | 3.3% | 956,011 | +4.1% | 0% | $49,311,047 |
| Artisan Partners Limited Partnership | 2.7% | 780,575 | -0.66% | 0.07% | $40,262,059 |
| BRAIDWELL LP | 2.3% | 677,570 | +25% | 1.2% | $34,949,061 |
| GOLDMAN SACHS GROUP INC | 2.3% | 664,003 | +133% | 0% | $34,249,275 |
| UBS Group AG | 2.2% | 638,928 | +55% | 0.01% | $32,955,906 |
| Soleus Capital Management, L.P. | 2% | 576,299 | +92% | 1.2% | $29,725,502 |
| Vestal Point Capital, LP | 1.9% | 539,269 | 0.78% | $27,815,495 | |
| Assenagon Asset Management S.A. | 1.8% | 520,174 | +96% | 0.04% | $26,830,575 |
| DEUTSCHE BANK AG\ | 1.8% | 513,175 | -0.7% | 0.01% | $26,469,567 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.8% | 510,234 | +3.8% | 0% | $26,324,178 |
| Aberdeen Group plc | 1.7% | 477,476 | +3.6% | 0.04% | $24,628,212 |
| RENAISSANCE TECHNOLOGIES LLC | 1.6% | 469,968 | +14% | 0.04% | $24,240,949 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 1.6% | 448,787 | -3.1% | 0% | $23,148,434 |
| ADAR1 Capital Management, LLC | 1.4% | 405,197 | +2601% | 1.3% | $20,900,061 |
| CITADEL ADVISORS LLC | 1.4% | 394,076 | -23% | 0.01% | $20,326,441 |
| MILLENNIUM MANAGEMENT LLC | 1.3% | 386,146 | +91% | 0.01% | $19,917,411 |
| Walleye Capital LLC | 1.2% | 358,489 | +358% | 0.11% | $18,490,863 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
32
Latest
Q1 2026
Rows shown
1-25 of 32
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 34,850,977 | $1,797,502,160 | -$107,821,202 | $51.58 | 296 |
| 2025 Q4 | 33,885,583 | $3,125,013,462 | +$310,804,814 | $92.23 | 342 |
| 2025 Q3 | 31,097,933 | $2,308,932,982 | -$485,546,950 | $74.20 | 323 |
| 2025 Q2 | 33,831,801 | $4,392,084,401 | -$58,153,296 | $129.77 | 355 |
| 2025 Q1 | 34,119,574 | $5,429,765,770 | +$100,291,872 | $159.28 | 359 |
| 2024 Q4 | 33,398,911 | $6,198,135,879 | -$10,392,454 | $185.38 | 352 |
| 2024 Q3 | 33,329,348 | $7,028,206,302 | -$1,705,882 | $211.05 | 343 |
| 2024 Q2 | 31,606,997 | $4,230,734,481 | -$140,076,478 | $133.83 | 320 |
| 2024 Q1 | 31,802,382 | $6,833,627,583 | +$185,419,402 | $214.79 | 324 |
| 2023 Q4 | 31,022,012 | $6,309,755,960 | +$504,375,008 | $203.43 | 344 |
| 2023 Q3 | 28,380,805 | $5,631,853,601 | -$36,280,954 | $198.44 | 356 |
| 2023 Q2 | 27,993,926 | $9,086,637,911 | -$98,840,711 | $324.64 | 401 |
| 2023 Q1 | 28,513,136 | $6,673,582,259 | +$65,144,358 | $234.07 | 368 |
| 2022 Q4 | 28,312,278 | $7,130,563,019 | +$41,625,853 | $251.88 | 333 |
| 2022 Q3 | 28,267,105 | $5,016,328,749 | +$139,991,536 | $177.37 | 292 |
| 2022 Q2 | 27,431,317 | $5,013,352,590 | +$89,018,351 | $182.67 | 276 |
| 2022 Q1 | 26,955,412 | $6,916,191,060 | +$287,047,237 | $256.69 | 291 |
| 2021 Q4 | 25,849,229 | $5,947,709,044 | +$76,974,096 | $230.06 | 283 |
| 2021 Q3 | 25,385,159 | $5,911,432,728 | +$104,134,188 | $232.88 | 247 |
| 2021 Q2 | 24,992,220 | $4,831,725,707 | -$34,514,146 | $193.26 | 246 |
| 2021 Q1 | 25,166,568 | $5,209,155,369 | +$94,545,681 | $206.99 | 247 |
| 2020 Q4 | 25,155,650 | $4,731,720,287 | -$140,415,322 | $188.09 | 237 |
| 2020 Q3 | 26,177,389 | $3,378,475,696 | -$39,929,859 | $129.05 | 201 |
| 2020 Q2 | 26,892,329 | $2,354,092,452 | +$328,506,311 | $87.02 | 186 |
| 2020 Q1 | 23,290,616 | $1,403,659,501 | -$140,442,230 | $60.28 | 166 |