INSPIRE MED SYS INC INSP
COM · Common Stock · CUSIP 457730109 · ISIN US4577301090
Company in Maple Grove, United States
- SectorHealth care
- IndustrySurgical & Medical Instruments & Apparatus
- HeadquartersGolden Valley, MN
- Founded2007
- Websiteinspiresleep.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($1.3m this quarter). Holder counts are more reliable. Shares outstanding: 28.9m as of 2026-07-30, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $44.57. Options: 7 managers hold calls ($5.0m notional), 5 hold puts ($7.2m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 302 |
| Q4 2022 | 339 |
| Q1 2023 | 373 |
| Q2 2023 | 408 |
| Q3 2023 | 366 |
| Q4 2023 | 343 |
| Q1 2024 | 327 |
| Q2 2024 | 325 |
| Q3 2024 | 347 |
| Q4 2024 | 357 |
| Q1 2025 | 364 |
| Q2 2025 | 358 |
| Q3 2025 | 325 |
| Q4 2025 | 344 |
| Q1 2026 | 301 |
| Q2 2026 | 275 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 190 | 164 |
| Q4 2024 | 166 | 168 |
| Q1 2025 | 194 | 163 |
| Q2 2025 | 177 | 193 |
| Q3 2025 | 157 | 226 |
| Q4 2025 | 191 | 181 |
| Q1 2026 | 170 | 194 |
| Q2 2026 | 159 | 166 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $9.1m | $19.4m | 2.14 |
| Q4 2025 | $41.8m | $47.2m | 1.13 |
| Q1 2026 | $4.9m | $17.0m | 3.45 |
| Q2 2026 | $5.0m | $7.2m | 1.46 |
Biggest buyers
| AQR CAPITAL MANAGEMENT LLC | Added | +1.5m |
| NOMURA HOLDINGS INC | New | +1.4m |
| Soleus Capital Management, L.P. | Added | +1.4m |
| Assenagon Asset Management S.A. | Added | +1.2m |
| BlackRock, Inc. | Added | +1.2m |
| UBS Group AG | Added | +1.0m |
| Nantahala Capital Management, LLC | New | +538.9k |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Added | +451.8k |
| SG Americas Securities, LLC | Added | +386.6k |
| D. E. Shaw & Co., Inc. | Added | +281.9k |
Biggest sellers
| DEERFIELD MANAGEMENT COMPANY, L.P. | Reduced | -1.4m |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Sold out | -1.1m |
| MORGAN STANLEY | Reduced | -659.4k |
| Vestal Point Capital, LP | Sold out | -539.3k |
| DEUTSCHE BANK AG\ | Reduced | -337.0k |
| RA CAPITAL MANAGEMENT, L.P. | Sold out | -325.7k |
| Jefferies Financial Group Inc. | Sold out | -306.4k |
| BAMCO INC /NY/ | Sold out | -298.5k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -292.0k |
| ROYAL BANK OF CANADA | Reduced | -245.3k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $2.9m66.1k shares |
| CITADEL ADVISORS LLC | Reduced | $1.0m23.3k shares |
| K2 PRINCIPAL FUND, L.P. | Reduced | $428.3k9.6k shares |
| IMC-Chicago, LLC | Reduced | $249.8k5.6k shares |
| JANE STREET GROUP, LLC | Reduced | $205.2k4.6k shares |
| SIMPLEX TRADING, LLC | Added | $66.9k1.5k shares |
| GROUP ONE TRADING LLC | Added | $17.8k400 shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $3.4m75.2k shares |
| CITADEL ADVISORS LLC | Reduced | $2.3m51.3k shares |
| JANE STREET GROUP, LLC | Reduced | $914.5k20.5k shares |
| IMC-Chicago, LLC | Reduced | $397.0k8.9k shares |
| SIMPLEX TRADING, LLC | Added | $281.0k6.3k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution +3.1 pts · filed 2026-07-28 | 14.4% |
| WELLINGTON MANAGEMENT GROUP LLP 13G · institution +1.2 pts · filed 2026-05-15 | 8.8% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution +1.7 pts · filed 2026-07-31 | 7.4% |
| Soleus Capital Master Fund, L.P. 13G · passive investor +1.6 pts · filed 2026-08-13 | 6.7% |
| AQR CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-08-12 | 6.4% |
| D. E. SHAW & CO, L.P. 13G · passive investor new · filed 2026-07-02 | 5.1% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-30 | 5.1% |
Fell to 5% or below in the last year: Flynn James E (4.5%, 2026-05-14), VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC), CITADEL ADVISORS LLC (1.8%, 2026-02-17), Dragoneer Investment Group, LLC (0.0%, 2025-11-14), WASATCH ADVISORS LP (0.5%, 2025-11-12)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 1 | $1.7m | $1.7m |
| Q1 2025 | 1 | $655 | 2 | $6.0m | $6.0m |
| Q2 2025 | 1 | $148 | 3 | $316.9k | $57.6k |
| Q3 2025 | 0 | — | 2 | $1.0m | — |
| Q4 2025 | 0 | — | 1 | $421.8k | $421.8k |
| Q1 2026 | 0 | — | 1 | $10.9k | $10.9k |
| Q2 2026 | 0 | — | 2 | $175.9k | $31.5k |
| Q3 2026 | 0 | — | 1 | $57.3k | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-08-07 | Kelly Jason P Officer | Sold | $57.3k963 shares |
| 2026-05-15 | Rondoni John Officer | Sold | $114.3k2.6k shares |
| 2026-05-14 | Rondoni John Officer | Sold | $30.1k700 shares |
| 2026-05-08 | mcCormick Shawn Director | Sold plan | $31.5k696 shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.00% of their portfolio | 4.7m $211.3m | Added +1.2m |
| WELLINGTON MANAGEMENT GROUP LLP 0.02% of their portfolio | 2.4m $106.3m | Reduced -153.3k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio | 2.1m $93.2m | Added +451.8k |
| Soleus Capital Management, L.P. 2.97% of their portfolio | 1.9m $86.2m | Added +1.4m |
| AQR CAPITAL MANAGEMENT LLC 0.03% of their portfolio | 1.9m $80.9m | Added +1.5m |
| Assenagon Asset Management S.A. 0.05% of their portfolio | 1.7m $77.1m | Added +1.2m |
| UBS Group AG 0.01% of their portfolio | 1.6m $73.4m | Added +1.0m |
| D. E. Shaw & Co., Inc. 0.04% of their portfolio | 1.5m $65.6m | Added +281.9k |
| NOMURA HOLDINGS INC 0.26% of their portfolio | 1.4m $61.1m | New |
| DEERFIELD MANAGEMENT COMPANY, L.P. 0.60% of their portfolio | 1.3m $57.9m | Reduced -1.4m |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.3m $56.7m | Added +4.2k |
| STATE STREET CORP 0.00% of their portfolio | 1.2m $53.8m | Added +250.5k |
| MORGAN STANLEY 0.00% of their portfolio | 791.2k $35.3m | Reduced -659.4k |
| Artisan Partners Limited Partnership 0.05% of their portfolio | 732.3k $32.7m | Reduced -48.3k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 700.8k $31.3m | Added +190.6k |
| BRAIDWELL LP 1.12% of their portfolio | 677.6k $30.2m | Unchanged |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 645.9k $28.8m | Reduced -18.1k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 546.0k $24.4m | Added +97.2k |
| Nantahala Capital Management, LLC 0.73% of their portfolio | 538.9k $24.0m | New |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 506.3k $22.6m | Added +112.3k |
| SG Americas Securities, LLC 0.01% of their portfolio | 491.7k $21.9m | Added +386.6k |
| BNP PARIBAS FINANCIAL MARKETS 0.01% of their portfolio | 428.1k $19.1m | Added +108.3k |
| RENAISSANCE TECHNOLOGIES LLC 0.03% of their portfolio | 426.0k $19.0m | Reduced -44.0k |
| ADAR1 Capital Management, LLC 0.79% of their portfolio | 374.6k $16.7m | Reduced -30.6k |
| Aberdeen Group plc 0.02% of their portfolio | 359.0k $16.0m | Reduced -118.5k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 334.0k $14.9m | Added +137.0k |
| BARCLAYS PLC 0.00% of their portfolio | 307.3k $13.7m | Added +239.6k |
| FEDERATED HERMES, INC. 0.02% of their portfolio | 272.1k $12.1m | Added +272.0k |
| FMR LLC 0.00% of their portfolio | 267.9k $11.9m | Added +229.9k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 248.8k $11.1m | Added +62.7k |
| Walleye Capital LLC 0.05% of their portfolio | 245.8k $11.0m | Reduced -112.7k |
| Rock Springs Capital Management LP 0.53% of their portfolio | 244.0k $10.9m | Added +112.2k |
| CAPITAL FUND MANAGEMENT S.A. 0.07% of their portfolio | 219.9k $9.8m | Added +110.9k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 210.1k $9.4m | Added +26.7k |
| NORGES BANK 0.00% of their portfolio | 198.3k $8.8m | Not comparable |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 190.6k $8.5m | Added +22.9k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 176.2k $7.9m | Reduced -337.0k |
| TUDOR INVESTMENT CORP ET AL 0.03% of their portfolio | 169.1k $7.5m | Added +1.9k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 167.7k $7.5m | Reduced -13.6k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.00% of their portfolio | 165.1k $7.4m | Added +1.0k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 148.6k $6.6m | Reduced -137 |
| BANK OF NOVA SCOTIA 0.01% of their portfolio | 145.0k $6.5m | Added +85.0k |
| Quantinno Capital Management LP 0.01% of their portfolio | 137.6k $6.1m | Added +111.1k |
| Edgestream Partners, L.P. 0.18% of their portfolio | 133.8k $6.0m | Added +51.5k |
| PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio | 128.2k $5.7m | Added +1.4k |
| Alberta Investment Management Corp 0.03% of their portfolio | 122.9k $5.5m | New |
| Rheos Capital Works Inc. 0.30% of their portfolio | 117.4k $5.2m | Unchanged |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 115.9k $5.2m | Reduced -118.8k |
| Invesco Ltd. 0.00% of their portfolio | 110.3k $4.9m | Added +6.3k |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 107.7k $4.8m | Added +43.4k |
| Integral Health Asset Management, LLC 0.18% of their portfolio | 100.0k $4.5m | New |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 94.1k $4.2m | Reduced -292.0k |
| Public Sector Pension Investment Board 0.01% of their portfolio | 90.1k $4.0m | Reduced -3.0k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 87.5k $3.9m | Reduced -55.9k |
| Susquehanna Portfolio Strategies, LLC 0.06% of their portfolio | 87.2k $3.9m | Reduced -19.0k |
| ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio | 81.3k $3.6m | Reduced -128.2k |
| Pacer Advisors, Inc. 0.01% of their portfolio | 80.5k $3.6m | New |
| CITIGROUP INC 0.00% of their portfolio | 77.8k $3.5m | Added +46.2k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 72.4k $3.2m | Added +1.5k |
| Voleon Capital Management LP 0.06% of their portfolio | 72.2k $3.2m | Added +39.1k |
| Nuveen, LLC 0.00% of their portfolio | 70.0k $3.1m | Reduced -15.1k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 64.2k $2.9m | Reduced -3.7k |
| Legal & General Group Plc 0.00% of their portfolio | 61.2k $2.7m | Reduced -347 |
| ALGERT GLOBAL LLC 0.03% of their portfolio | 60.5k $2.7m | Added +7.7k |
| Corient Private Wealth LP 0.00% of their portfolio | 57.5k $2.6m | Added +52.3k |
| Y-Intercept (Hong Kong) Ltd 0.05% of their portfolio | 55.7k $2.5m | Reduced -102.6k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 53.2k $2.4m | Reduced -157.4k |
| Bullseye Asset Management LLC 1.18% of their portfolio | 52.2k $2.3m | Added +1.1k |
| Swiss National Bank 0.00% of their portfolio | 52.0k $2.3m | Reduced -3.5k |
| Empowered Funds, LLC 0.01% of their portfolio | 50.7k $2.3m | Added +15.8k |
| LPL Financial LLC 0.00% of their portfolio | 47.9k $2.1m | Added +36.4k |
| NORDEA INVESTMENT MANAGEMENT AB 0.00% of their portfolio | 44.4k $1.9m | Added +4.0k |
| BROWN CAPITAL MANAGEMENT LLC 0.39% of their portfolio | 44.0k $2.0m | Reduced -40.4k |
| Brevan Howard Capital Management LP 0.03% of their portfolio | 43.2k $1.9m | Added +37.7k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 42.0k $1.9m | Reduced -11.6k |
| WINTON GROUP Ltd 0.05% of their portfolio | 37.4k $1.7m | Added +33.2k |
| Creative Planning 0.00% of their portfolio | 37.4k $1.7m | Added +26.1k |
| Entropy Technologies, LP 0.07% of their portfolio | 37.3k $1.7m | New |
| Gotham Asset Management, LLC 0.00% of their portfolio | 35.8k $1.6m | Reduced -51.9k |
| FIRST TRUST ADVISORS LP 0.00% of their portfolio | 34.2k $1.5m | Reduced -37.4k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 33.7k $1.7m | Added +18.6k |
| Jump Financial, LLC 0.01% of their portfolio | 31.9k $1.4m | Added +23.7k |
| Mariner, LLC 0.00% of their portfolio | 30.2k $1.3m | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 29.8k $1.3m | Added +24.5k |
| AXQ CAPITAL, LP 0.14% of their portfolio | 29.6k $1.3m | Reduced -3.4k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 29.5k $1.3m | Reduced -4.9k |
| WORLDQUANT MILLENNIUM ADVISORS LLC 0.00% of their portfolio | 28.4k $1.3m | Reduced -46.9k |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 27.7k $1.2m | Added +4.0k |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 27.7k $1.2m | Reduced -15.5k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 26.4k $1.2m | New |
| Odyssean, LLC 0.19% of their portfolio | 26.3k $1.2m | New |
| Quantbot Technologies LP 0.05% of their portfolio | 26.0k $1.2m | New |
| ExodusPoint Capital Management, LP 0.01% of their portfolio | 25.7k $1.1m | New |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 25.6k $1.1m | Added +2.0k |
| VANGUARD ASSET MANAGEMENT, Ltd 0.00% of their portfolio | 25.5k $1.1m | Unchanged |
| MERCER GLOBAL ADVISORS INC /ADV 0.00% of their portfolio | 24.9k $1.1m | Added +19.0k |
| Squarepoint Ops LLC 0.00% of their portfolio | 24.3k $1.1m | Reduced -42.6k |
| LAZARD ASSET MANAGEMENT LLC 0.00% of their portfolio | 21.8k $974.3k | Added +2.9k |
| CANADA LIFE ASSURANCE Co 0.00% of their portfolio | 21.6k $965.0k | Unchanged |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 21.5k $960.5k | Added +10.9k |