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 ($43.9m this quarter). Holder counts are more reliable. Shares outstanding: 29.5m as of 2023-10-31, 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 ≈ $199.32. Options: 16 managers hold calls ($68.4m notional), 21 hold puts ($140.9m).
Trends to Q3 2023
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 |
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 |
| Q3 2023 | 192 | 209 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2022 | $99.7m | $39.8m | 0.40 |
| Q1 2023 | $41.3m | $37.3m | 0.90 |
| Q2 2023 | $76.8m | $73.3m | 0.95 |
| Q3 2023 | $68.4m | $140.9m | 2.06 |
Biggest buyers
| FMR LLC | Added | +1.4m |
| Point72 Asset Management, L.P. | Added | +653.7k |
| WASATCH ADVISORS LP | Added | +481.3k |
| WELLINGTON MANAGEMENT GROUP LLP | Added | +411.5k |
| 1832 Asset Management L.P. | Added | +229.5k |
| WESTFIELD CAPITAL MANAGEMENT CO LP | Added | +168.7k |
| Man Group plc | New | +158.7k |
| Hood River Capital Management LLC | New | +139.1k |
| Bank of New York Mellon Corp | Added | +128.1k |
| FEDERATED HERMES, INC. | Added | +119.8k |
Biggest sellers
| Invesco Ltd. | Reduced | -892.4k |
| LORD, ABBETT & CO. LLC | Reduced | -696.8k |
| Bellevue Group AG | Reduced | -286.7k |
| CITADEL ADVISORS LLC | Reduced | -270.6k |
| MARSHALL WACE, LLP | Reduced | -266.1k |
| Polar Capital Holdings Plc | Reduced | -262.5k |
| FRANKLIN RESOURCES INC | Reduced | -255.8k |
| D. E. Shaw & Co., Inc. | Reduced | -254.6k |
| Driehaus Capital Management LLC | Reduced | -194.3k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Reduced | -142.0k |
Biggest calls
| CITADEL ADVISORS LLC | Added | $20.4m102.7k shares |
| MILLENNIUM MANAGEMENT LLC | Added | $12.9m65.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $9.4m47.2k shares |
| JANE STREET GROUP, LLC | Added | $6.6m33.4k shares |
| Cubist Systematic Strategies, LLC | New | $3.7m18.5k shares |
| PEAK6 Investments LLC | Added | $3.2m16.0k shares |
| SIMPLEX TRADING, LLC | Added | $3.0m15.0k shares |
| Twin Tree Management, LP | Reduced | $2.7m13.7k shares |
| TWO SIGMA SECURITIES, LLC | Added | $2.6m13.3k shares |
| BANK OF AMERICA CORP /DE/ | Reduced | $1.2m6.0k shares |
Biggest puts
| Caption Management, LLC | New | $32.0m161.1k shares |
| Paloma Partners Management Co | New | $29.8m150.0k shares |
| CITADEL ADVISORS LLC | Added | $11.6m58.7k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $10.5m53.0k shares |
| PEAK6 Investments LLC | Added | $9.2m46.4k shares |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | New | $7.9m40.0k shares |
| SIMPLEX TRADING, LLC | Added | $7.8m39.4k shares |
| D. E. Shaw & Co., Inc. | Added | $7.3m36.8k shares |
| JANE STREET GROUP, LLC | Added | $7.2m36.4k shares |
| MILLENNIUM MANAGEMENT LLC | Added | $6.9m35.0k 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 Q3 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 |
|---|---|---|---|---|---|
| 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 |
| Q3 2023 | 0 | — | 2 | $822.5k | $822.5k |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-09-08 | Herbert Timothy P. CEO and President, director · By LLC | Sold | —48.0k shares |
| 2023-07-31 | Griffin Jerry C Director | Sold plan | $153.7k529 shares |
| 2023-07-24 | Griffin Jerry C Director | Sold plan | $161.3k529 shares |
| 2023-07-17 | Griffin Jerry C Director | Sold plan | $172.9k529 shares |
| 2023-07-10 | Griffin Jerry C Director | Sold plan | $164.2k529 shares |
| 2023-07-03 | Griffin Jerry C Director | Sold plan | $170.4k529 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 2023
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.01% of their portfolio | 3.0m $597.8m | Reduced -1.5k |
| FMR LLC 0.04% of their portfolio | 2.5m $490.4m | Added +1.4m |
| BlackRock Inc. 0.01% of their portfolio | 1.9m $376.1m | Added +77.8k |
| WASATCH ADVISORS LP 1.23% of their portfolio | 977.6k $194.0m | Added +481.3k |
| WELLINGTON MANAGEMENT GROUP LLP 0.04% of their portfolio | 977.0k $193.9m | Added +411.5k |
| Point72 Asset Management, L.P. 0.60% of their portfolio | 883.4k $175.3m | Added +653.7k |
| FRANKLIN RESOURCES INC 0.08% of their portfolio | 789.5k $156.7m | Reduced -255.8k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.99% of their portfolio | 732.4k $145.3m | Added +168.7k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.46% of their portfolio | 694.1k $137.7m | Reduced -142.0k |
| MACQUARIE GROUP LTD 0.15% of their portfolio | 603.6k $119.8m | Added +32.3k |
| 1832 Asset Management L.P. 0.23% of their portfolio | 562.4k $111.6m | Added +229.5k |
| STATE STREET CORP 0.01% of their portfolio | 524.5k $104.1m | Added +9.8k |
| FEDERATED HERMES, INC. 0.26% of their portfolio | 496.4k $98.5m | Added +119.8k |
| Champlain Investment Partners, LLC 0.60% of their portfolio | 469.5k $93.2m | Reduced -96.6k |
| GILDER GAGNON HOWE & CO LLC 1.40% of their portfolio | 463.1k $91.9m | Reduced -33.0k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 0.48% of their portfolio | 426.1k $84.6m | Added +103.0k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 424.3k $84.2m | Added +10.7k |
| FRED ALGER MANAGEMENT, LLC 0.46% of their portfolio | 405.5k $80.5m | Reduced -61.9k |
| Bank of New York Mellon Corp 0.02% of their portfolio | 373.8k $74.2m | Added +128.1k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 4.62% of their portfolio | 368.5k $73.1m | Added +86.5k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.79% of their portfolio | 361.7k $71.8m | Reduced -45.2k |
| CREDIT SUISSE AG/ 0.07% of their portfolio | 348.3k $69.1m | Added +67.5k |
| AMERIPRISE FINANCIAL INC 0.02% of their portfolio | 333.5k $66.2m | Reduced -797 |
| MILLENNIUM MANAGEMENT LLC 0.07% of their portfolio | 319.7k $63.4m | Added +55.3k |
| RENAISSANCE TECHNOLOGIES LLC 0.11% of their portfolio | 315.4k $62.6m | Added +58.3k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 260.3k $51.7m | Reduced -56.8k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 256.2k $50.8m | Added +7.8k |
| VOYA INVESTMENT MANAGEMENT LLC 0.06% of their portfolio | 253.9k $50.4m | Reduced -24.1k |
| NORGES BANK 0.01% of their portfolio | 244.9k $48.6m | Added +7.3k |
| BAMCO INC /NY/ 0.14% of their portfolio | 244.7k $48.6m | Unchanged |
| Allspring Global Investments Holdings, LLC 0.08% of their portfolio | 231.7k $46.0m | Reduced -124.9k |
| LORD, ABBETT & CO. LLC 0.08% of their portfolio | 204.3k $40.5m | Reduced -696.8k |
| LOOMIS SAYLES & CO L P 0.07% of their portfolio | 200.0k $39.7m | Reduced -51.8k |
| Eversept Partners, LP 4.25% of their portfolio | 193.0k $38.3m | Added +110.6k |
| Invesco Ltd. 0.01% of their portfolio | 187.8k $37.3m | Reduced -892.4k |
| VICTORY CAPITAL MANAGEMENT INC 0.04% of their portfolio | 165.2k $32.8m | Added +53.3k |
| D. E. Shaw & Co., Inc. 0.05% of their portfolio | 164.7k $32.7m | Reduced -254.6k |
| KEYBANK NATIONAL ASSOCIATION/OH 0.15% of their portfolio | 160.6k $31.9m | Reduced -630 |
| Driehaus Capital Management LLC 0.41% of their portfolio | 159.1k $31.6m | Reduced -194.3k |
| Man Group plc 0.10% of their portfolio | 158.7k $31.5m | New |
| NORTHERN TRUST CORP 0.01% of their portfolio | 149.3k $29.6m | Added +3.5k |
| Cubist Systematic Strategies, LLC 0.34% of their portfolio | 140.8k $27.9m | Added +85.9k |
| Atika Capital Management LLC 3.96% of their portfolio | 140.2k $27.8m | Unchanged |
| Hood River Capital Management LLC 0.89% of their portfolio | 139.1k $27.6m | New |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 126.9k $25.2m | Added +18.8k |
| Quadrature Capital Ltd 0.51% of their portfolio | 125.2k $24.8m | Added +62.5k |
| EVENTIDE ASSET MANAGEMENT, LLC 0.45% of their portfolio | 125.1k $24.8m | Added +16.9k |
| MORGAN STANLEY 0.00% of their portfolio | 124.7k $24.8m | Reduced -65.7k |
| Amundi 0.01% of their portfolio | 123.2k $18.5m | Reduced -50.7k |
| Qube Research & Technologies Ltd 0.07% of their portfolio | 111.4k $22.1m | Added +107.6k |
| FIRST TRUST ADVISORS LP 0.03% of their portfolio | 108.2k $21.5m | Added +102.7k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.03% of their portfolio | 105.7k $21.0m | Reduced -81.8k |
| Integral Health Asset Management, LLC 2.96% of their portfolio | 105.0k $20.8m | Added +2.0k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 103.3k $20.5m | Added +14.8k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.05% of their portfolio | 102.9k $20.4m | Reduced -51.4k |
| BRAIDWELL LP 0.63% of their portfolio | 100.3k $19.9m | New |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 99.5k $19.8m | Reduced -56.6k |
| Eagle Health Investments LP 4.08% of their portfolio | 93.2k $18.5m | Added +20.4k |
| Employees Retirement System of Texas 0.27% of their portfolio | 91.0k $18.1m | Added +8.0k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 87.7k $17.4m | Added +2.9k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 83.6k $16.6m | Reduced -39.6k |
| SEI INVESTMENTS CO 0.03% of their portfolio | 80.8k $16.0m | Reduced -6.3k |
| BARCLAYS PLC 0.01% of their portfolio | 79.9k $15.9m | Added +40.0k |
| BNP PARIBAS FINANCIAL MARKETS 0.03% of their portfolio | 78.0k $15.5m | Added +7.5k |
| Mitsubishi UFJ Trust & Banking Corp 0.04% of their portfolio | 72.6k $14.4m | Added +44.8k |
| KORNITZER CAPITAL MANAGEMENT INC /KS 0.30% of their portfolio | 72.2k $14.3m | Reduced -3.9k |
| Bellevue Group AG 0.22% of their portfolio | 70.4k $14.0m | Reduced -286.7k |
| COMERICA BANK 0.07% of their portfolio | 70.0k $13.9m | New |
| Walleye Capital LLC 0.20% of their portfolio | 67.8k $13.5m | New |
| Swiss National Bank 0.01% of their portfolio | 64.2k $12.7m | Added +700 |
| Rheos Capital Works Inc. 0.75% of their portfolio | 63.1k $12.5m | Added +43.1k |
| MAIRS & POWER INC 0.15% of their portfolio | 62.5k $12.4m | Added +9.9k |
| Thrivent Financial for Lutherans 0.03% of their portfolio | 60.3k $12.0m | Reduced -104.3k |
| NOVO HOLDINGS A/S 0.88% of their portfolio | 60.0k $11.9m | Added +27.5k |
| EAGLE ASSET MANAGEMENT INC 0.07% of their portfolio | 58.1k $11.5m | Reduced -27.2k |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC 1.38% of their portfolio | 56.4k $11.2m | Added +46.5k |
| Squarepoint Ops LLC 0.05% of their portfolio | 56.1k $11.1m | New |
| LOS ANGELES CAPITAL MANAGEMENT LLC 0.05% of their portfolio | 55.2k $11.0m | Reduced -33.0k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 52.6k $10.4m | Reduced -140.1k |
| California Public Employees Retirement System 0.01% of their portfolio | 52.6k $10.4m | Reduced -28 |
| Ensign Peak Advisors, Inc 0.02% of their portfolio | 51.5k $10.2m | Reduced -406 |
| Jump Financial, LLC 0.37% of their portfolio | 50.7k $10.1m | Added +29.9k |
| CAPITAL FUND MANAGEMENT S.A. 0.13% of their portfolio | 50.3k $10.0m | New |
| AMERICAN CENTURY COMPANIES INC 0.01% of their portfolio | 50.2k $10.0m | Added +45.3k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 49.1k $9.7m | Reduced -270.6k |
| NEXT CENTURY GROWTH INVESTORS LLC 1.03% of their portfolio | 47.9k $9.5m | Added +15.0k |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 47.7k $9.5m | Added +566 |
| Schonfeld Strategic Advisors LLC 0.08% of their portfolio | 45.2k $9.0m | Added +33.7k |
| Rock Springs Capital Management LP 0.24% of their portfolio | 44.5k $8.8m | New |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.04% of their portfolio | 44.2k $8.8m | Reduced -15.8k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.03% of their portfolio | 43.6k $8.6m | Added +5.2k |
| JENNISON ASSOCIATES LLC 0.01% of their portfolio | 40.7k $8.1m | Reduced -51.7k |
| PURA VIDA INVESTMENTS, LLC 3.95% of their portfolio | 40.5k $8.0m | Reduced -14.7k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.01% of their portfolio | 40.2k $8.0m | Added +9.2k |
| Prosight Management, LP 2.52% of their portfolio | 40.0k $7.9m | New |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 39.2k $7.8m | Added +64 |
| Legal & General Group Plc 0.00% of their portfolio | 38.8k $7.7m | Reduced -974 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.01% of their portfolio | 38.7k $7.7m | Added +550 |
| LAZARD ASSET MANAGEMENT LLC 0.01% of their portfolio | 37.6k $7.5m | Added +3.5k |
| Assenagon Asset Management S.A. 0.03% of their portfolio | 37.0k $7.3m | Reduced -55.4k |