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 ($11.4m this quarter). Holder counts are more reliable. Shares outstanding: 29.1m as of 2025-10-29, 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 ≈ $74.25. Options: 11 managers hold calls ($9.1m notional), 11 hold puts ($19.4m).
Trends to Q3 2025
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 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2023 | 171 | 202 |
| Q1 2024 | 165 | 162 |
| Q2 2024 | 189 | 167 |
| Q3 2024 | 190 | 164 |
| Q4 2024 | 166 | 168 |
| Q1 2025 | 194 | 163 |
| Q2 2025 | 177 | 193 |
| Q3 2025 | 157 | 226 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2024 | $54.8m | $73.8m | 1.35 |
| Q1 2025 | $36.7m | $34.9m | 0.95 |
| Q2 2025 | $15.4m | $16.7m | 1.08 |
| Q3 2025 | $9.1m | $19.4m | 2.14 |
Biggest buyers
| CITADEL ADVISORS LLC | Added | +1.7m |
| DEERFIELD MANAGEMENT COMPANY, L.P. | Added | +907.7k |
| Soleus Capital Management, L.P. | Added | +619.2k |
| Balyasny Asset Management L.P. | New | +614.4k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Added | +528.4k |
| BNP PARIBAS FINANCIAL MARKETS | Added | +462.4k |
| BRAIDWELL LP | Added | +361.3k |
| MILLENNIUM MANAGEMENT LLC | New | +356.8k |
| D. E. Shaw & Co., Inc. | Added | +344.6k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Added | +225.3k |
Biggest sellers
| Dragoneer Investment Group, LLC | Sold out | -2.4m |
| FMR LLC | Reduced | -1.5m |
| WASATCH ADVISORS LP | Reduced | -1.5m |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Reduced | -530.9k |
| TimesSquare Capital Management, LLC | Sold out | -499.2k |
| MACQUARIE GROUP LTD | Reduced | -452.2k |
| CONGRESS ASSET MANAGEMENT CO | Reduced | -359.8k |
| BlackRock, Inc. | Reduced | -326.6k |
| BAMCO INC /NY/ | Reduced | -301.7k |
| Man Group plc | Reduced | -296.5k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $2.9m39.4k shares |
| CITADEL ADVISORS LLC | Added | $2.3m30.6k shares |
| IMC-Chicago, LLC | New | $1.3m16.9k shares |
| JANE STREET GROUP, LLC | Reduced | $749.4k10.1k shares |
| TUDOR INVESTMENT CORP ET AL | Added | $526.8k7.1k shares |
| GROUP ONE TRADING LLC | New | $378.4k5.1k shares |
| WOLVERINE TRADING, LLC | Added | $340.2k4.5k shares |
| Cubist Systematic Strategies, LLC | New | $282.0k3.8k shares |
| SIMPLEX TRADING, LLC | Reduced | $215.0k2.9k shares |
| Walleye Trading LLC | New | $89.0k1.2k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $8.3m112.2k shares |
| CITADEL ADVISORS LLC | Added | $5.8m78.6k shares |
| JANE STREET GROUP, LLC | Added | $1.2m16.8k shares |
| IMC-Chicago, LLC | New | $1.2m16.3k shares |
| GROUP ONE TRADING LLC | New | $972.0k13.1k shares |
| WOLVERINE TRADING, LLC | Added | $703.2k9.3k shares |
| Cubist Systematic Strategies, LLC | New | $415.5k5.6k shares |
| TUDOR INVESTMENT CORP ET AL | New | $385.8k5.2k shares |
| Walleye Capital LLC | Added | $185.5k2.5k shares |
| Walleye Trading LLC | New | $89.0k1.2k 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)
Insider purchases and sales in Q3 2025
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 2023 | 1 | $15.3k | 0 | — | — |
| Q1 2024 | 0 | — | 3 | $5.6m | $2.8m |
| Q2 2024 | 0 | — | 3 | $11.7m | $3.5m |
| Q3 2024 | 0 | — | 3 | $5.2m | $5.2m |
| 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 | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-08-29 | Buchholz Richard Chief Financial Officer | Sold | $1.0m11.0k shares |
| 2025-08-08 | Curet Myriam Director | Sold | $3094 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, Q3 2025
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.00% of their portfolio | 3.5m $263.2m | Reduced -326.6k |
| VANGUARD GROUP INC 0.00% of their portfolio | 3.0m $222.6m | Reduced -203.5k |
| CITADEL ADVISORS LLC 0.10% of their portfolio | 1.7m $129.7m | Added +1.7m |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.25% of their portfolio | 1.3m $96.3m | Added +528.4k |
| BAILLIE GIFFORD & CO 0.06% of their portfolio | 1.1m $80.5m | Reduced -29.5k |
| DEERFIELD MANAGEMENT COMPANY, L.P. 1.19% of their portfolio | 1.0m $77.7m | Added +907.7k |
| STATE STREET CORP 0.00% of their portfolio | 979.3k $72.7m | Reduced -51.6k |
| BRAIDWELL LP 1.95% of their portfolio | 883.7k $65.6m | Added +361.3k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 833.6k $61.9m | Added +225.3k |
| FMR LLC 0.00% of their portfolio | 749.3k $55.6m | Reduced -1.5m |
| Soleus Capital Management, L.P. 2.89% of their portfolio | 728.2k $54.0m | Added +619.2k |
| JANUS HENDERSON GROUP PLC 0.02% of their portfolio | 667.1k $49.5m | Added +26.2k |
| Balyasny Asset Management L.P. 0.09% of their portfolio | 614.4k $45.6m | New |
| Artisan Partners Limited Partnership 0.06% of their portfolio | 526.2k $39.0m | Added +163.9k |
| BNP PARIBAS FINANCIAL MARKETS 0.03% of their portfolio | 522.2k $38.7m | Added +462.4k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 505.0k $37.5m | Reduced -7.8k |
| UBS Group AG 0.01% of their portfolio | 467.7k $34.7m | Added +37.0k |
| MORGAN STANLEY 0.00% of their portfolio | 450.6k $33.4m | Added +147.8k |
| Champlain Investment Partners, LLC 0.23% of their portfolio | 407.1k $30.2m | Reduced -5.0k |
| Aberdeen Group plc 0.05% of their portfolio | 396.3k $30.0m | Added +153.2k |
| D. E. Shaw & Co., Inc. 0.02% of their portfolio | 358.9k $26.6m | Added +344.6k |
| MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio | 356.8k $26.5m | New |
| DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio | 343.7k $25.5m | Reduced -1.1k |
| FRANKLIN RESOURCES INC 0.01% of their portfolio | 297.2k $22.1m | Added +68.7k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 288.8k $21.4m | Added +34.4k |
| BROWN CAPITAL MANAGEMENT LLC 0.85% of their portfolio | 278.0k $20.6m | Reduced -89.4k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 263.2k $19.5m | Added +169.2k |
| EVENTIDE ASSET MANAGEMENT, LLC 0.31% of their portfolio | 256.7k $19.0m | Added +100.0k |
| Amundi 0.01% of their portfolio | 255.1k $19.5m | Added +71.2k |
| KEYBANK NATIONAL ASSOCIATION/OH 0.05% of their portfolio | 200.0k $14.8m | Reduced -626 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 193.1k $14.3m | Reduced -90.5k |
| BAMCO INC /NY/ 0.04% of their portfolio | 190.0k $14.1m | Reduced -301.7k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 189.8k $14.1m | Reduced -12.7k |
| Atika Capital Management LLC 1.19% of their portfolio | 187.6k $13.9m | Added +25.7k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 166.9k $12.4m | Reduced -160.9k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.11% of their portfolio | 162.3k $12.0m | Reduced -530.9k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 160.7k $11.9m | Reduced -223.3k |
| RENAISSANCE TECHNOLOGIES LLC 0.02% of their portfolio | 155.0k $11.5m | Added +28.2k |
| M&G PLC 0.06% of their portfolio | 145.0k $10.7m | Added +92.0k |
| Connor, Clark & Lunn Investment Management Ltd. 0.03% of their portfolio | 139.3k $10.3m | Reduced -73.4k |
| CAPSTONE INVESTMENT ADVISORS, LLC 0.09% of their portfolio | 136.8k $10.2m | Added +132.4k |
| WASATCH ADVISORS LP 0.05% of their portfolio | 135.9k $10.1m | Reduced -1.5m |
| Vestal Point Capital, LP 0.45% of their portfolio | 135.0k $10.0m | New |
| MARSHALL WACE, LLP 0.01% of their portfolio | 134.3k $10.0m | Added +118.4k |
| PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio | 129.0k $9.6m | Reduced -16.7k |
| Walleye Capital LLC 0.08% of their portfolio | 128.6k $9.5m | Added +128.6k |
| CREDIT AGRICOLE S A 0.03% of their portfolio | 125.3k $9.3m | First filing |
| Integral Health Asset Management, LLC 0.65% of their portfolio | 120.0k $8.9m | Added +50.0k |
| RA CAPITAL MANAGEMENT, L.P. 0.11% of their portfolio | 114.9k $8.5m | New |
| Rock Springs Capital Management LP 0.48% of their portfolio | 110.5k $8.2m | Added +3.0k |
| WCM INVESTMENT MANAGEMENT, LLC 0.02% of their portfolio | 107.0k $8.1m | Reduced -3.7k |
| Public Sector Pension Investment Board 0.03% of their portfolio | 105.0k $7.8m | Added +4.5k |
| FEDERATED HERMES, INC. 0.01% of their portfolio | 103.8k $7.7m | Reduced -124.5k |
| RIVERBRIDGE PARTNERS LLC 0.13% of their portfolio | 103.6k $7.7m | Reduced -10.3k |
| Regal Partners Ltd 0.54% of their portfolio | 101.7k $7.5m | New |
| Y-Intercept (Hong Kong) Ltd 0.18% of their portfolio | 99.0k $7.3m | Added +83.9k |
| Cubist Systematic Strategies, LLC 0.10% of their portfolio | 97.4k $7.2m | New |
| Invesco Ltd. 0.00% of their portfolio | 92.8k $6.9m | Reduced -240.4k |
| Point72 Asset Management, L.P. 0.01% of their portfolio | 91.9k $6.8m | Added +16.5k |
| WINTON GROUP Ltd 0.25% of their portfolio | 91.5k $6.8m | Added +83.4k |
| LAZARD ASSET MANAGEMENT LLC 0.01% of their portfolio | 89.6k $6.6m | Added +17.5k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 89.1k $6.6m | Reduced -23.4k |
| Bridgewater Associates, LP 0.03% of their portfolio | 89.0k $6.6m | Reduced -52.7k |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.02% of their portfolio | 88.3k $6.6m | New |
| Legal & General Group Plc 0.00% of their portfolio | 84.3k $6.3m | Reduced -11.4k |
| Man Group plc 0.01% of their portfolio | 83.8k $6.2m | Reduced -296.5k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 82.8k $6.1m | New |
| Voleon Capital Management LP 0.14% of their portfolio | 78.5k $5.8m | New |
| Susquehanna Portfolio Strategies, LLC 0.09% of their portfolio | 75.6k $5.6m | New |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 73.1k $5.4m | Added +4.6k |
| CAPITAL FUND MANAGEMENT S.A. 0.05% of their portfolio | 73.0k $5.4m | Added +4.3k |
| Verition Fund Management LLC 0.03% of their portfolio | 71.7k $5.3m | Added +55.3k |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 71.5k $5.3m | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 69.3k $5.1m | Added +51.3k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 67.2k $5.0m | Reduced -3.6k |
| MAIRS & POWER INC 0.05% of their portfolio | 65.4k $4.9m | Reduced -2.4k |
| Weiss Asset Management LP 0.07% of their portfolio | 63.0k $4.7m | Not comparable |
| Rhenman & Partners Asset Management AB 0.50% of their portfolio | 61.0k $4.5m | Added +30.5k |
| Bellevue Group AG 0.09% of their portfolio | 58.6k $4.4m | Reduced -17.0k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.01% of their portfolio | 58.5k $4.3m | New |
| Mitsubishi UFJ Trust & Banking Corp 0.01% of their portfolio | 55.8k $4.1m | Reduced -1.8k |
| Swiss National Bank 0.00% of their portfolio | 54.4k $4.0m | Reduced -2.4k |
| Rheos Capital Works Inc. 0.22% of their portfolio | 52.4k $3.9m | Unchanged |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 50.2k $3.7m | Reduced -141.0k |
| Affinity Asset Advisors, LLC 0.35% of their portfolio | 50.0k $3.7m | New |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 49.4k $3.7m | Reduced -72.0k |
| Nuveen, LLC 0.00% of their portfolio | 47.9k $3.6m | Reduced -165 |
| TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY 0.03% of their portfolio | 46.4k $3.4m | Added +3.6k |
| HRT FINANCIAL LP 0.02% of their portfolio | 45.7k $3.4m | New |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 43.5k $3.2m | Added +35.6k |
| MACQUARIE GROUP LTD 0.00% of their portfolio | 43.3k $3.2m | Reduced -452.2k |
| CITIGROUP INC 0.00% of their portfolio | 42.3k $3.1m | Reduced -9.2k |
| BANK OF MONTREAL /CAN/ 0.00% of their portfolio | 41.9k $3.1m | Added +36.4k |
| Quantbot Technologies LP 0.08% of their portfolio | 41.1k $3.0m | New |
| Kopp Family Office, LLC 1.96% of their portfolio | 40.6k $3.0m | Unchanged |
| CANADA PENSION PLAN INVESTMENT BOARD 0.00% of their portfolio | 39.6k $2.9m | Added +29.2k |
| Point72 Hong Kong Ltd 0.13% of their portfolio | 39.1k $2.9m | Added +21.7k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 37.2k $2.8m | Added +17.8k |
| Aquatic Capital Management LLC 0.05% of their portfolio | 37.1k $2.7m | First filing |
| Bullseye Asset Management LLC 1.40% of their portfolio | 36.1k $2.7m | Unchanged |