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 ($10.0m this quarter). Holder counts are more reliable. Shares outstanding: 29.6m as of 2024-02-01, 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 ≈ $203.40. Options: 23 managers hold calls ($80.1m notional), 20 hold puts ($112.5m).
Trends to Q4 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 |
| Q4 2023 | 343 |
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 |
| Q4 2023 | 171 | 202 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q1 2023 | $41.3m | $37.3m | 0.90 |
| Q2 2023 | $76.8m | $73.3m | 0.95 |
| Q3 2023 | $68.4m | $140.9m | 2.06 |
| Q4 2023 | $80.1m | $112.5m | 1.40 |
Biggest buyers
| BAILLIE GIFFORD & CO | Added | +1.2m |
| JPMORGAN CHASE & CO | Added | +1.2m |
| FMR LLC | Added | +786.1k |
| WELLINGTON MANAGEMENT GROUP LLP | Added | +453.3k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. | Added | +429.0k |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Added | +380.4k |
| Slate Path Capital LP | New | +294.0k |
| JENNISON ASSOCIATES LLC | Added | +264.1k |
| MARSHALL WACE, LLP | Added | +236.7k |
| MORGAN STANLEY | Added | +222.4k |
Biggest sellers
| 1832 Asset Management L.P. | Sold out | -562.4k |
| Point72 Asset Management, L.P. | Reduced | -410.2k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -306.7k |
| FRANKLIN RESOURCES INC | Reduced | -275.5k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | Reduced | -226.7k |
| GILDER GAGNON HOWE & CO LLC | Reduced | -207.1k |
| LORD, ABBETT & CO. LLC | Sold out | -204.3k |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | -201.8k |
| LOOMIS SAYLES & CO L P | Sold out | -200.0k |
| WESTFIELD CAPITAL MANAGEMENT CO LP | Reduced | -186.8k |
Biggest calls
| CITADEL ADVISORS LLC | Reduced | $14.7m72.5k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $13.1m64.5k shares |
| CAPITAL FUND MANAGEMENT S.A. | New | $10.2m50.3k shares |
| JANE STREET GROUP, LLC | Added | $8.0m39.3k shares |
| MILLENNIUM MANAGEMENT LLC | Reduced | $5.2m25.4k shares |
| Cubist Systematic Strategies, LLC | Added | $5.0m24.8k shares |
| PURA VIDA INVESTMENTS, LLC | New | $4.1m20.0k shares |
| Squarepoint Ops LLC | New | $3.4m16.7k shares |
| SIMPLEX TRADING, LLC | Reduced | $3.0m14.8k shares |
| JPMORGAN CHASE & CO | New | $3.0m14.6k shares |
Biggest puts
| MILLENNIUM MANAGEMENT LLC | Added | $17.4m85.4k shares |
| CITADEL ADVISORS LLC | Added | $16.8m82.6k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $14.9m73.0k shares |
| D. E. Shaw & Co., Inc. | Added | $14.4m70.7k shares |
| CAPITAL FUND MANAGEMENT S.A. | Added | $14.3m70.4k shares |
| JPMORGAN CHASE & CO | New | $14.0m69.0k shares |
| SIMPLEX TRADING, LLC | Reduced | $5.0m24.6k shares |
| Cubist Systematic Strategies, LLC | Added | $4.4m21.5k shares |
| PEAK6 Investments LLC | Reduced | $2.7m13.5k shares |
| JANE STREET GROUP, LLC | Reduced | $1.6m8.1k 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 Q4 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 |
|---|---|---|---|---|---|
| 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 |
| Q4 2023 | 1 | $15.3k | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-10-12 | Sparks Charisse Y Chief Medical Officer | Bought | $15.3k100 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, Q4 2023
| Manager | Shares | Change |
|---|---|---|
| FMR LLC 0.05% of their portfolio | 3.3m $662.7m | Added +786.1k |
| VANGUARD GROUP INC 0.01% of their portfolio | 2.9m $596.3m | Reduced -80.9k |
| BlackRock Inc. 0.01% of their portfolio | 1.8m $366.2m | Reduced -95.2k |
| WELLINGTON MANAGEMENT GROUP LLP 0.05% of their portfolio | 1.4m $291.0m | Added +453.3k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 1.3m $257.1m | Added +1.2m |
| BAILLIE GIFFORD & CO 0.20% of their portfolio | 1.2m $250.2m | Added +1.2m |
| WASATCH ADVISORS LP 1.23% of their portfolio | 1.1m $223.2m | Added +119.7k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 1.09% of their portfolio | 855.1k $174.0m | Added +429.0k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.48% of their portfolio | 806.9k $164.2m | Added +112.8k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 1.52% of their portfolio | 742.0k $151.0m | Added +380.4k |
| Champlain Investment Partners, LLC 0.78% of their portfolio | 648.6k $131.9m | Added +179.1k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.65% of their portfolio | 545.6k $111.0m | Reduced -186.8k |
| MACQUARIE GROUP LTD 0.13% of their portfolio | 538.6k $109.6m | Reduced -65.0k |
| STATE STREET CORP 0.01% of their portfolio | 531.2k $108.1m | Added +6.7k |
| FRANKLIN RESOURCES INC 0.05% of their portfolio | 514.0k $104.6m | Reduced -275.5k |
| AMERIPRISE FINANCIAL INC 0.03% of their portfolio | 491.3k $99.9m | Added +157.8k |
| Point72 Asset Management, L.P. 0.29% of their portfolio | 473.2k $96.3m | Reduced -410.2k |
| FEDERATED HERMES, INC. 0.23% of their portfolio | 453.3k $92.2m | Reduced -43.1k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 444.8k $90.5m | Added +20.5k |
| FRED ALGER MANAGEMENT, LLC 0.45% of their portfolio | 405.9k $82.6m | Added +445 |
| Bank of New York Mellon Corp 0.02% of their portfolio | 398.5k $81.1m | Added +24.7k |
| CREDIT SUISSE AG/ 0.07% of their portfolio | 356.1k $72.4m | Added +7.8k |
| Eversept Partners, LP 7.00% of their portfolio | 351.1k $71.4m | Added +158.1k |
| MORGAN STANLEY 0.00% of their portfolio | 347.1k $70.6m | Added +222.4k |
| JENNISON ASSOCIATES LLC 0.05% of their portfolio | 304.9k $62.0m | Added +264.1k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 302.9k $61.6m | Added +42.6k |
| Slate Path Capital LP 1.33% of their portfolio | 294.0k $59.8m | New |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 263.9k $53.7m | Added +7.7k |
| GILDER GAGNON HOWE & CO LLC 0.71% of their portfolio | 256.0k $52.1m | Reduced -207.1k |
| MARSHALL WACE, LLP 0.10% of their portfolio | 247.6k $50.4m | Added +236.7k |
| NORGES BANK 0.01% of their portfolio | 241.4k $49.1m | Reduced -3.5k |
| Allspring Global Investments Holdings, LLC 0.07% of their portfolio | 219.8k $44.7m | Reduced -11.9k |
| Bellevue Group AG 0.67% of their portfolio | 215.6k $43.9m | Added +145.2k |
| BAMCO INC /NY/ 0.11% of their portfolio | 211.0k $42.9m | Reduced -33.7k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.09% of their portfolio | 209.9k $42.7m | Added +107.0k |
| Driehaus Capital Management LLC 0.50% of their portfolio | 201.9k $41.1m | Added +42.8k |
| KEYBANK NATIONAL ASSOCIATION/OH 0.18% of their portfolio | 201.3k $41.0m | Added +40.7k |
| D. E. Shaw & Co., Inc. 0.05% of their portfolio | 184.9k $37.6m | Added +20.2k |
| BRAIDWELL LP 1.38% of their portfolio | 184.7k $37.6m | Added +84.4k |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC 3.97% of their portfolio | 182.8k $37.2m | Added +126.5k |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 162.3k $33.0m | Reduced -91.6k |
| Hood River Capital Management LLC 0.88% of their portfolio | 156.4k $31.8m | Added +17.3k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 155.2k $31.6m | Added +5.9k |
| Iron Triangle Partners LP 3.95% of their portfolio | 150.0k $30.5m | New |
| VICTORY CAPITAL MANAGEMENT INC 0.03% of their portfolio | 142.8k $29.1m | Reduced -22.4k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 1.57% of their portfolio | 141.8k $28.8m | Reduced -226.7k |
| Ophir Asset Management Pty Ltd 5.08% of their portfolio | 125.8k $25.6m | New |
| EVENTIDE ASSET MANAGEMENT, LLC 0.42% of their portfolio | 125.1k $25.4m | Unchanged |
| Atika Capital Management LLC 3.52% of their portfolio | 121.6k $24.7m | Reduced -18.6k |
| RENAISSANCE TECHNOLOGIES LLC 0.04% of their portfolio | 113.6k $23.1m | Reduced -201.8k |
| Eagle Health Investments LP 4.69% of their portfolio | 113.5k $23.1m | Added +20.3k |
| Degroof Petercam Asset Management 0.29% of their portfolio | 110.0k $22.4m | First filing |
| Mitsubishi UFJ Trust & Banking Corp 0.05% of their portfolio | 110.0k $22.4m | Added +37.4k |
| Thrivent Financial for Lutherans 0.05% of their portfolio | 108.9k $22.2m | Added +48.6k |
| Schonfeld Strategic Advisors LLC 0.18% of their portfolio | 107.3k $21.8m | Added +62.1k |
| Parkman Healthcare Partners LLC 2.99% of their portfolio | 103.7k $21.1m | Added +76.8k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 103.0k $20.9m | Reduced -334 |
| Susquehanna Portfolio Strategies, LLC 0.37% of their portfolio | 101.6k $20.7m | First filing |
| Balyasny Asset Management L.P. 0.06% of their portfolio | 100.8k $20.5m | Added +83.7k |
| Rock Springs Capital Management LP 0.50% of their portfolio | 99.0k $20.1m | Added +54.5k |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 98.5k $20.0m | Reduced -28.4k |
| ExodusPoint Capital Management, LP 0.22% of their portfolio | 88.8k $18.1m | Added +63.0k |
| First Light Asset Management, LLC 1.45% of their portfolio | 88.5k $18.0m | New |
| Alyeska Investment Group, L.P. 0.12% of their portfolio | 87.7k $17.8m | New |
| SEI INVESTMENTS CO 0.03% of their portfolio | 85.4k $17.4m | Added +4.6k |
| Connor, Clark & Lunn Investment Management Ltd. 0.07% of their portfolio | 78.5k $16.0m | Added +65.1k |
| BARCLAYS PLC 0.01% of their portfolio | 74.2k $15.1m | Reduced -5.7k |
| KORNITZER CAPITAL MANAGEMENT INC /KS 0.29% of their portfolio | 72.2k $14.7m | Unchanged |
| TUDOR INVESTMENT CORP ET AL 0.20% of their portfolio | 71.6k $14.6m | Added +62.9k |
| Ensign Peak Advisors, Inc 0.03% of their portfolio | 70.7k $14.4m | Added +19.3k |
| COMERICA BANK 0.07% of their portfolio | 70.6k $14.4m | Added +600 |
| CANADA PENSION PLAN INVESTMENT BOARD 0.02% of their portfolio | 70.0k $14.2m | Added +29.8k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 69.3k $14.1m | Reduced -18.4k |
| JANE STREET GROUP, LLC 0.02% of their portfolio | 66.0k $13.4m | Added +38.3k |
| NOVO HOLDINGS A/S 0.82% of their portfolio | 65.5k $13.3m | Added +5.5k |
| Aquatic Capital Management LLC 0.34% of their portfolio | 65.5k $13.3m | Added +62.0k |
| MAIRS & POWER INC 0.14% of their portfolio | 64.6k $13.1m | Added +2.1k |
| AQR CAPITAL MANAGEMENT LLC 0.02% of their portfolio | 63.4k $12.9m | Added +49.1k |
| Rheos Capital Works Inc. 0.71% of their portfolio | 63.1k $12.8m | Unchanged |
| STATE OF WISCONSIN INVESTMENT BOARD 0.04% of their portfolio | 62.5k $12.7m | Added +18.9k |
| NOMURA ASSET MANAGEMENT CO LTD 0.05% of their portfolio | 60.2k $12.2m | Added +60.2k |
| Integral Health Asset Management, LLC 1.76% of their portfolio | 60.0k $12.2m | Reduced -45.0k |
| Swiss National Bank 0.01% of their portfolio | 57.8k $11.8m | Reduced -6.4k |
| Amundi 0.00% of their portfolio | 57.7k $11.0m | Reduced -65.5k |
| Stanley-Laman Group, Ltd. 1.59% of their portfolio | 51.1k $10.4m | New |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 50.9k $10.3m | Added +3.1k |
| Aberdeen Group plc 0.02% of their portfolio | 46.0k $9.3m | New |
| ROYCE & ASSOCIATES LP 0.08% of their portfolio | 42.3k $8.6m | Added +28.8k |
| CAPITAL FUND MANAGEMENT S.A. 0.11% of their portfolio | 41.5k $8.4m | Reduced -8.8k |
| Man Group plc 0.02% of their portfolio | 40.5k $8.2m | New |
| California Public Employees Retirement System 0.01% of their portfolio | 40.3k $8.2m | Reduced -12.2k |
| Polar Asset Management Partners Inc. 0.22% of their portfolio | 39.8k $8.1m | New |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 38.8k $7.9m | Reduced -469 |
| Invesco Ltd. 0.00% of their portfolio | 37.2k $7.6m | Reduced -150.6k |
| ARMISTICE CAPITAL, LLC 0.20% of their portfolio | 36.5k $7.4m | Added +32.9k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 35.0k $7.1m | Reduced -17.6k |
| LAZARD ASSET MANAGEMENT LLC 0.01% of their portfolio | 34.2k $6.9m | Reduced -3.4k |
| Kopp Family Office, LLC 3.95% of their portfolio | 33.2k $6.8m | Added +15.1k |
| UBS Group AG 0.00% of their portfolio | 33.2k $6.7m | Added +2.4k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio | 33.0k $6.7m | Added +276 |