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 ($41.3m this quarter). Holder counts are more reliable. Shares outstanding: 29.3m as of 2023-07-24, 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 ≈ $324.31. Options: 19 managers hold calls ($76.8m notional), 15 hold puts ($73.3m).
Trends to Q2 2023
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 302 |
| Q4 2022 | 339 |
| Q1 2023 | 373 |
| Q2 2023 | 408 |
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 2022 | 185 | 137 |
| Q1 2023 | 217 | 129 |
| Q2 2023 | 209 | 192 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2022 | $119.8m | $40.8m | 0.34 |
| Q4 2022 | $99.7m | $39.8m | 0.40 |
| Q1 2023 | $41.3m | $37.3m | 0.90 |
| Q2 2023 | $76.8m | $73.3m | 0.95 |
Biggest buyers
| D. E. Shaw & Co., Inc. | Added | +201.9k |
| VOYA INVESTMENT MANAGEMENT LLC | Added | +163.8k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | +158.4k |
| 1832 Asset Management L.P. | Added | +148.4k |
| WESTFIELD CAPITAL MANAGEMENT CO LP | Added | +141.0k |
| MARSHALL WACE, LLP | Added | +119.1k |
| MILLENNIUM MANAGEMENT LLC | Added | +112.4k |
| Man Group plc | New | +110.1k |
| HRT FINANCIAL LP | New | +83.6k |
| Eversept Partners, LP | New | +82.4k |
Biggest sellers
| FMR LLC | Reduced | -1.0m |
| BlackRock Inc. | Reduced | -464.5k |
| VIKING GLOBAL INVESTORS LP | Sold out | -346.6k |
| ENVESTNET ASSET MANAGEMENT INC | Reduced | -210.1k |
| NORTHERN TRUST CORP | Reduced | -177.3k |
| Polar Asset Management Partners Inc. | Reduced | -129.0k |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | -123.2k |
| STATE STREET CORP | Reduced | -116.1k |
| Granite Investment Partners, LLC | Reduced | -99.5k |
| AMERICAN CENTURY COMPANIES INC | Reduced | -91.8k |
Biggest calls
| CITADEL ADVISORS LLC | Added | $18.5m57.1k shares |
| JANE STREET GROUP, LLC | Added | $7.9m24.4k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $7.1m22.0k shares |
| BANK OF AMERICA CORP /DE/ | Added | $6.5m20.0k shares |
| Twin Tree Management, LP | New | $6.4m19.8k shares |
| Parallax Volatility Advisers, L.P. | New | $4.9m15.0k shares |
| PEAK6 Investments LLC | Added | $4.7m14.5k shares |
| Walleye Trading LLC | Added | $4.6m14.3k shares |
| SIMPLEX TRADING, LLC | Added | $4.5m13.8k shares |
| Walleye Capital LLC | Added | $4.4m13.4k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $20.5m63.0k shares |
| CITADEL ADVISORS LLC | Added | $16.9m52.0k shares |
| D. E. Shaw & Co., Inc. | Added | $9.6m29.7k shares |
| Walleye Capital LLC | Added | $5.4m16.6k shares |
| Walleye Trading LLC | Added | $4.6m14.3k shares |
| SIMPLEX TRADING, LLC | Reduced | $3.7m11.3k shares |
| MILLENNIUM MANAGEMENT LLC | New | $3.2m10.0k shares |
| JANE STREET GROUP, LLC | Added | $3.1m9.5k shares |
| WOLVERINE TRADING, LLC | Added | $2.7m8.6k shares |
| PEAK6 Investments LLC | Reduced | $1.4m4.4k 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)
Insider purchases and sales in Q2 2023
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 |
|---|---|---|---|---|---|
| Q3 2021 | 0 | — | 0 | — | — |
| Q4 2021 | 0 | — | 2 | $7.7m | — |
| Q1 2022 | 0 | — | 3 | $35.2m | — |
| Q2 2022 | 0 | — | 2 | $6.6m | — |
| Q3 2022 | 0 | — | 0 | — | — |
| Q4 2022 | 0 | — | 4 | $10.8m | — |
| Q1 2023 | 0 | — | 5 | $21.8m | — |
| Q2 2023 | 0 | — | 2 | $5.3m | $4.9m |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-06-26 | Griffin Jerry C Director | Sold | $167.1k529 shares |
| 2023-06-20 | Griffin Jerry C Director | Sold plan | $162.7k529 shares |
| 2023-06-12 | Griffin Jerry C Director | Sold | $163.5k529 shares |
| 2023-06-05 | Griffin Jerry C Director | Sold plan | $161.7k529 shares |
| 2023-05-30 | Griffin Jerry C Director | Sold plan | $156.0k529 shares |
| 2023-05-22 | Griffin Jerry C Director | Sold plan | $162.7k529 shares |
| 2023-05-15 | Griffin Jerry C Director | Sold plan | $155.5k529 shares |
| 2023-05-12 | Jandrich Steven VP, Human Resources | Sold plan | $1.3m4.5k shares |
| 2023-05-08 | Jandrich Steven VP, Human Resources | Sold plan | $483.8k1.7k shares |
| 2023-05-08 | Griffin Jerry C Director | Sold plan | $148.1k529 shares |
| 2023-04-25 | Jandrich Steven VP, Human Resources | Sold plan | $2.2m8.0k 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 2023
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.02% of their portfolio | 3.0m $978.4m | Reduced -87.9k |
| BlackRock Inc. 0.02% of their portfolio | 1.8m $590.1m | Reduced -464.5k |
| Invesco Ltd. 0.09% of their portfolio | 1.1m $350.7m | Added +51.5k |
| FMR LLC 0.03% of their portfolio | 1.1m $348.6m | Reduced -1.0m |
| FRANKLIN RESOURCES INC 0.16% of their portfolio | 1.0m $339.3m | Added +2.7k |
| LORD, ABBETT & CO. LLC 0.50% of their portfolio | 901.1k $292.5m | Added +7.5k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.87% of their portfolio | 836.2k $271.5m | Reduced -528 |
| MACQUARIE GROUP LTD 0.21% of their portfolio | 571.3k $185.5m | Reduced -27.7k |
| Champlain Investment Partners, LLC 1.13% of their portfolio | 566.1k $183.8m | Reduced -90.2k |
| WELLINGTON MANAGEMENT GROUP LLP 0.03% of their portfolio | 565.5k $183.6m | Reduced -20.0k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 1.16% of their portfolio | 563.7k $183.0m | Added +141.0k |
| STATE STREET CORP 0.01% of their portfolio | 514.7k $167.1m | Reduced -116.1k |
| WASATCH ADVISORS LP 0.98% of their portfolio | 496.3k $161.1m | Reduced -87.3k |
| GILDER GAGNON HOWE & CO LLC 2.20% of their portfolio | 496.1k $161.0m | Reduced -15.6k |
| FRED ALGER MANAGEMENT, LLC 0.78% of their portfolio | 467.4k $151.7m | Reduced -80.8k |
| D. E. Shaw & Co., Inc. 0.21% of their portfolio | 419.3k $136.1m | Added +201.9k |
| GEODE CAPITAL MANAGEMENT, LLC 0.02% of their portfolio | 413.6k $134.3m | Reduced -123.2k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 1.27% of their portfolio | 406.9k $132.1m | Added +20.3k |
| FEDERATED HERMES, INC. 0.30% of their portfolio | 376.6k $122.2m | Added +33.7k |
| Bellevue Group AG 1.65% of their portfolio | 357.0k $115.9m | Reduced -20.0k |
| Allspring Global Investments Holdings, LLC 0.19% of their portfolio | 356.6k $115.8m | Reduced -61.5k |
| Driehaus Capital Management LLC 1.45% of their portfolio | 353.4k $114.7m | Added +14.3k |
| AMERIPRISE FINANCIAL INC 0.03% of their portfolio | 334.3k $108.5m | Added +6.8k |
| 1832 Asset Management L.P. 0.21% of their portfolio | 332.9k $108.1m | Added +148.4k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 0.63% of their portfolio | 323.1k $104.9m | Added +80.5k |
| CITADEL ADVISORS LLC 0.12% of their portfolio | 319.7k $103.8m | Added +14.5k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 317.1k $103.0m | Added +23.9k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 4.65% of their portfolio | 282.1k $91.6m | Reduced -13.2k |
| CREDIT SUISSE AG/ 0.09% of their portfolio | 280.8k $91.2m | Reduced -5.6k |
| VOYA INVESTMENT MANAGEMENT LLC 0.09% of their portfolio | 278.0k $90.3m | Added +163.8k |
| MARSHALL WACE, LLP 0.19% of their portfolio | 277.0k $89.9m | Added +119.1k |
| Polar Capital Holdings Plc 0.59% of their portfolio | 265.2k $86.1m | Reduced -3.5k |
| MILLENNIUM MANAGEMENT LLC 0.09% of their portfolio | 264.4k $85.8m | Added +112.4k |
| RENAISSANCE TECHNOLOGIES LLC 0.12% of their portfolio | 257.1k $83.5m | Added +46.1k |
| LOOMIS SAYLES & CO L P 0.13% of their portfolio | 251.8k $81.7m | Reduced -34.8k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.02% of their portfolio | 248.4k $80.6m | Reduced -59.7k |
| Bank of New York Mellon Corp 0.02% of their portfolio | 245.7k $79.8m | Reduced -28.3k |
| BAMCO INC /NY/ 0.22% of their portfolio | 244.7k $79.5m | Reduced -24.2k |
| NORGES BANK 0.02% of their portfolio | 237.6k $77.1m | Reduced -10.0k |
| Point72 Asset Management, L.P. 0.26% of their portfolio | 229.6k $74.5m | Added +59.0k |
| GOLDMAN SACHS GROUP INC 0.02% of their portfolio | 192.8k $62.6m | Added +58.2k |
| MORGAN STANLEY 0.01% of their portfolio | 190.4k $61.8m | Added +9.0k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.10% of their portfolio | 187.5k $60.9m | Added +158.4k |
| Amundi 0.03% of their portfolio | 174.0k $55.6m | Added +52.8k |
| Thrivent Financial for Lutherans 0.12% of their portfolio | 164.6k $53.4m | Added +2.7k |
| KEYBANK NATIONAL ASSOCIATION/OH 0.24% of their portfolio | 161.3k $52.4m | Reduced -750 |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 156.2k $50.7m | Reduced -38.2k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.11% of their portfolio | 154.4k $50.1m | Added +43.1k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 145.8k $47.3m | Reduced -177.3k |
| Atika Capital Management LLC 5.72% of their portfolio | 140.2k $45.5m | Reduced -1.2k |
| PRINCIPAL FINANCIAL GROUP INC 0.03% of their portfolio | 123.2k $40.0m | Added +5.5k |
| Nicholas Investment Partners, LP 2.56% of their portfolio | 115.2k $37.4m | Reduced -3.7k |
| VICTORY CAPITAL MANAGEMENT INC 0.04% of their portfolio | 111.9k $36.3m | Reduced -76.3k |
| Artisan Partners Limited Partnership 0.06% of their portfolio | 111.8k $36.3m | Added +113 |
| Man Group plc 0.11% of their portfolio | 110.1k $35.7m | New |
| EVENTIDE ASSET MANAGEMENT, LLC 0.59% of their portfolio | 108.2k $35.1m | Unchanged |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 108.1k $35.1m | Added +14.8k |
| Integral Health Asset Management, LLC 4.39% of their portfolio | 103.0k $33.4m | Added +23.0k |
| TimesSquare Capital Management, LLC 0.48% of their portfolio | 102.3k $33.2m | Added +400 |
| JENNISON ASSOCIATES LLC 0.02% of their portfolio | 92.4k $30.0m | Reduced -76.7k |
| Assenagon Asset Management S.A. 0.12% of their portfolio | 92.3k $30.0m | Added +51.3k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 88.5k $20.7m | Unchanged |
| LOS ANGELES CAPITAL MANAGEMENT LLC 0.11% of their portfolio | 88.2k $28.6m | Added +79.8k |
| SEI INVESTMENTS CO 0.05% of their portfolio | 87.1k $28.3m | Reduced -5.9k |
| EAGLE ASSET MANAGEMENT INC 0.15% of their portfolio | 85.3k $27.7m | Reduced -2.6k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 84.8k $27.5m | Reduced -34.9k |
| HRT FINANCIAL LP 0.26% of their portfolio | 83.6k $27.2m | New |
| Employees Retirement System of Texas 0.37% of their portfolio | 83.0k $26.9m | Reduced -16.0k |
| Eversept Partners, LP 2.83% of their portfolio | 82.4k $26.8m | New |
| KORNITZER CAPITAL MANAGEMENT INC /KS 0.49% of their portfolio | 76.1k $24.7m | Added +25.9k |
| Eagle Health Investments LP 4.42% of their portfolio | 72.8k $23.6m | Reduced -28.7k |
| BNP PARIBAS FINANCIAL MARKETS 0.05% of their portfolio | 70.4k $22.9m | Added +32.1k |
| Iron Triangle Partners LP 3.11% of their portfolio | 70.0k $22.7m | Unchanged |
| Swiss National Bank 0.01% of their portfolio | 63.5k $20.6m | Added +1.2k |
| Quadrature Capital Ltd 0.45% of their portfolio | 62.7k $20.3m | Reduced -14.0k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.09% of their portfolio | 60.0k $19.5m | New |
| THORNBURG INVESTMENT MANAGEMENT INC 0.29% of their portfolio | 55.3k $18.0m | Added +21.8k |
| PURA VIDA INVESTMENTS, LLC 7.44% of their portfolio | 55.2k $17.9m | Reduced -39.7k |
| Cubist Systematic Strategies, LLC 0.20% of their portfolio | 54.8k $17.8m | Reduced -73.1k |
| MAIRS & POWER INC 0.19% of their portfolio | 52.6k $17.1m | Reduced -54.7k |
| California Public Employees Retirement System 0.01% of their portfolio | 52.6k $17.1m | Added +7.1k |
| Ensign Peak Advisors, Inc 0.03% of their portfolio | 51.9k $16.8m | Added +9.7k |
| Park West Asset Management LLC 1.42% of their portfolio | 50.0k $16.2m | Reduced -36.5k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 49.6k $16.1m | Added +33.4k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 48.7k $15.8m | Added +14.0k |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 47.2k $15.3m | Added +26.8k |
| Aquatic Capital Management LLC 0.81% of their portfolio | 46.3k $15.0m | Added +42.8k |
| Ergoteles LLC 0.68% of their portfolio | 43.8k $14.2m | Added +42.4k |
| BARCLAYS PLC 0.01% of their portfolio | 39.9k $13.0m | Added +10.1k |
| Legal & General Group Plc 0.00% of their portfolio | 39.8k $12.9m | Added +5.2k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 39.2k $12.7m | Reduced -791 |
| Russell Investments Group, Ltd. 0.02% of their portfolio | 38.8k $12.6m | Added +3.7k |
| SEGALL BRYANT & HAMILL, LLC 0.13% of their portfolio | 38.7k $12.6m | Added +179 |
| WCM INVESTMENT MANAGEMENT, LLC 0.04% of their portfolio | 38.5k $12.3m | New |
| STATE OF WISCONSIN INVESTMENT BOARD 0.04% of their portfolio | 38.3k $12.4m | Reduced -1.7k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.02% of their portfolio | 38.2k $12.4m | Added +26.3k |
| ExodusPoint Capital Management, LP 0.14% of their portfolio | 37.6k $12.2m | New |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 35.5k $11.5m | Added +5.6k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.02% of their portfolio | 35.3k $11.5m | Reduced -741 |
| UBS Group AG 0.00% of their portfolio | 34.2k $11.1m | Reduced -14.1k |