Latest Period
Q4 2025
Security Snapshot
Inspire Medical Systems, Inc. - Common Stock (INSP) Institutional Ownership
CUSIP: 457730109
13F Institutional Holders and Ownership History from Q2 2018 to Q1 2026
Institutions Reporting
342
Shares (Excl. Options)
33,885,583
Price
$92.23
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- Type / Class
- Equity / Common Stock
- Symbol
- INSP on NYSE
- Shares outstanding
- 28,817,706
- Price per share
- $54.14
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 33,885,583
- Total reported value
- $3,125,013,462
- % of total 13F portfolios
- 0%
- Share change
- +2,857,618
- Value change
- +$310,804,814
- Number of holders
- 342
- Price from insider filings
- $54.14
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- INSP - Inspire Medical Systems, Inc. - Common Stock is tracked under CUSIP 457730109.
- 342 institutions reported positions in Q4 2025.
- 8 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 342 to 64 between Q4 2025 and Q1 2026.
- Reported value moved from $3,125,013,462 to $95,252,539.
Why This Matters
- 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.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 342 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 457730109?
CUSIP 457730109 identifies INSP - Inspire Medical Systems, Inc. - Common Stock in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 457730109:
Significant Owners of Inspire Medical Systems, Inc. - Common Stock (INSP) based on Schedule 13D/G filings
| 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 | 7.6% | $210,053,645 | 2,211,091 | Wellington Management Group LLP | 31 Dec 2025 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.7% | $84,837,082 | 1,644,767 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| Flynn James E | 5.1% | $109,541,683 | 1,476,303 | Deerfield Mgmt, L.P. | 06 Nov 2025 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.1% | $75,807,281 | 1,469,703 | Vanguard Capital Management | 31 Mar 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 Dec 2025, 342 institutional investors reported holding 33,885,583 shares of Inspire Medical Systems, Inc. - Common Stock (INSP). This represents 118% of the company’s total 28,817,706 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Inspire Medical Systems, Inc. - Common Stock (INSP) together control 80% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 12% | 3,550,848 | +0.1% | 0.01% | $327,494,715 |
| VANGUARD GROUP INC | 10% | 2,953,170 | -1.6% | 0% | $272,370,870 |
| WELLINGTON MANAGEMENT GROUP LLP | 7.7% | 2,211,091 | 0.04% | $203,928,923 | |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 5.2% | 1,505,872 | +44% | 1.8% | $138,886,575 |
| MORGAN STANLEY | 4.4% | 1,259,762 | +180% | 0.01% | $116,188,052 |
| D. E. Shaw & Co., Inc. | 4.2% | 1,212,162 | +238% | 0.08% | $111,797,701 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 4% | 1,161,285 | -11% | 0.3% | $107,105,316 |
| STATE STREET CORP | 3.2% | 918,504 | -6.2% | 0% | $84,713,624 |
| Artisan Partners Limited Partnership | 2.7% | 785,742 | +49% | 0.11% | $72,468,985 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 2.3% | 668,099 | 0.21% | $61,618,806 | |
| JANUS HENDERSON GROUP PLC | 2% | 562,331 | -16% | 0.02% | $51,861,389 |
| BRAIDWELL LP | 1.9% | 540,890 | -39% | 1.6% | $49,886,285 |
| MARSHALL WACE, LLP | 1.8% | 531,079 | +296% | 0.05% | $48,981,418 |
| DEUTSCHE BANK AG\ | 1.8% | 516,816 | +7090% | 0.02% | $47,665,939 |
| CITADEL ADVISORS LLC | 1.8% | 511,318 | -71% | 0.03% | $47,158,859 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.7% | 491,750 | -2.6% | 0% | $45,363,565 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 1.6% | 463,316 | -44% | 0.01% | $42,731,635 |
| Aberdeen Group plc | 1.6% | 460,901 | +16% | 0.07% | $42,508,899 |
| BNP PARIBAS FINANCIAL MARKETS | 1.6% | 454,810 | 0% | 0.03% | $41,947,126 |
| EVENTIDE ASSET MANAGEMENT, LLC | 1.5% | 440,205 | +72% | 0.63% | $40,600,643 |
| UBS Group AG | 1.4% | 411,329 | -12% | 0.01% | $37,936,873 |
| RENAISSANCE TECHNOLOGIES LLC | 1.4% | 410,768 | +165% | 0.06% | $37,885,133 |
| Amundi | 1.3% | 364,622 | +43% | 0.01% | $33,629,087 |
| Driehaus Capital Management LLC | 1.2% | 348,500 | 0.22% | $32,142,155 | |
| DIMENSIONAL FUND ADVISORS LP | 1.2% | 341,397 | -0.68% | 0.01% | $31,487,633 |
Institutional Holders of Inspire Medical Systems, Inc. - Common Stock (INSP) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 1,847,130 | $95,252,539 | -$3,198,713 | $51.58 | 64 |
| 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 |
| 2019 Q4 | 22,240,719 | $1,650,480,334 | +$34,675,200 | $74.21 | 169 |
| 2019 Q3 | 21,815,581 | $1,331,183,700 | +$112,850,027 | $61.02 | 153 |
| 2019 Q2 | 19,969,050 | $1,211,118,776 | +$171,165,829 | $60.65 | 145 |
| 2019 Q1 | 17,810,823 | $1,011,266,751 | +$172,131,617 | $56.78 | 143 |
| 2018 Q4 | 14,874,625 | $628,449,909 | +$162,990,460 | $42.25 | 102 |
| 2018 Q3 | 9,259,018 | $389,611,304 | -$2,907,456 | $42.08 | 85 |
| 2018 Q2 | 9,448,509 | $336,936,129 | +$336,926,999 | $35.66 | 75 |