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 ($53.1m this quarter). Holder counts are more reliable. Shares outstanding: 29.2m as of 2023-04-25, 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 ≈ $232.60. Options: 16 managers hold calls ($41.3m notional), 12 hold puts ($37.3m).
Trends to Q1 2023
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 302 |
| Q4 2022 | 339 |
| Q1 2023 | 373 |
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 |
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 |
Biggest buyers
| FMR LLC | Added | +836.3k |
| Invesco Ltd. | Added | +352.7k |
| Polar Capital Holdings Plc | New | +268.6k |
| ENVESTNET ASSET MANAGEMENT INC | Added | +212.4k |
| 1832 Asset Management L.P. | New | +184.5k |
| RENAISSANCE TECHNOLOGIES LLC | Added | +170.2k |
| BlackRock Inc. | Added | +146.3k |
| VANGUARD GROUP INC | Added | +123.3k |
| FEDERATED HERMES, INC. | Added | +102.9k |
| Employees Retirement System of Texas | New | +99.0k |
Biggest sellers
| MACQUARIE GROUP LTD | Reduced | -461.6k |
| CITADEL ADVISORS LLC | Reduced | -327.1k |
| Assenagon Asset Management S.A. | Reduced | -298.6k |
| Point72 Asset Management, L.P. | Reduced | -242.3k |
| VIKING GLOBAL INVESTORS LP | Reduced | -203.2k |
| PURA VIDA INVESTMENTS, LLC | Reduced | -106.1k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -63.1k |
| Man Group plc | Sold out | -54.9k |
| Lisanti Capital Growth, LLC | Reduced | -49.1k |
| TimesSquare Capital Management, LLC | Reduced | -48.9k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $11.2m47.7k shares |
| CITADEL ADVISORS LLC | Reduced | $9.7m41.6k shares |
| BANK OF AMERICA CORP /DE/ | New | $4.1m17.6k shares |
| JANE STREET GROUP, LLC | Added | $2.7m11.4k shares |
| PEAK6 Investments LLC | Added | $2.2m9.3k shares |
| Walleye Trading LLC | Added | $1.9m8.0k shares |
| SIMPLEX TRADING, LLC | Added | $1.9m8.0k shares |
| K2 PRINCIPAL FUND, L.P. | New | $1.4m6.0k shares |
| JPMORGAN CHASE & CO | New | $1.4m6.0k shares |
| WOLVERINE TRADING, LLC | New | $1.3m5.6k shares |
Biggest puts
| CITADEL ADVISORS LLC | Added | $11.3m48.1k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $11.3m48.1k shares |
| D. E. Shaw & Co., Inc. | New | $4.7m20.0k shares |
| SIMPLEX TRADING, LLC | Added | $3.3m14.1k shares |
| PEAK6 Investments LLC | New | $2.8m12.1k shares |
| WOLVERINE TRADING, LLC | New | $1.5m6.3k shares |
| TWO SIGMA SECURITIES, LLC | Added | $772.4k3.3k shares |
| Walleye Trading LLC | Added | $491.5k2.1k shares |
| JANE STREET GROUP, LLC | Added | $491.5k2.1k shares |
| Walleye Capital LLC | Added | $374.5k1.6k 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 Q1 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 |
|---|---|---|---|---|---|
| Q2 2021 | 0 | — | 0 | — | — |
| 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 | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-03-01 | Ban Randy Chief Commercial Officer | Sold | —10.0k shares |
| 2023-02-16 | Ebeling Philip Chief Operating Officer | Sold | $1.9m7.0k shares |
| 2023-02-15 | Herbert Timothy P. CEO and President, director | Sold | $3.2m11.7k shares |
| 2023-02-14 | Herbert Timothy P. CEO and President, director | Sold | $5.5m20.1k shares |
| 2023-02-13 | Herbert Timothy P. CEO and President, director · By family trust | Sold | $720.4k2.6k shares |
| 2023-02-09 | Herbert Timothy P. CEO and President, director · By family trust | Sold | $1.9m7.0k shares |
| 2023-02-08 | Herbert Timothy P. CEO and President, director · By family trust | Sold | $962.5k3.5k shares |
| 2023-02-08 | Rondoni John Chief Technology Officer | Sold | $670.3k2.5k shares |
| 2023-02-06 | Rondoni John Chief Technology Officer | Sold | $875.7k3.5k shares |
| 2023-01-13 | Buchholz Richard Chief Financial Officer | Sold | $3.0m12.0k shares |
| 2023-01-11 | Buchholz Richard Chief Financial Officer | Sold | $130.8k523 shares |
| 2023-01-03 | Ban Randy Chief Commercial Officer | Sold | $2.5m10.0k shares |
| 2023-01-03 | Rondoni John Chief Technology Officer | Sold | $299.5k1.2k 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, Q1 2023
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.02% of their portfolio | 3.1m $726.0m | Added +123.3k |
| BlackRock Inc. 0.02% of their portfolio | 2.3m $534.2m | Added +146.3k |
| FMR LLC 0.02% of their portfolio | 2.1m $494.7m | Added +836.3k |
| FRANKLIN RESOURCES INC 0.12% of their portfolio | 1.0m $244.0m | Reduced -31.6k |
| Invesco Ltd. 0.07% of their portfolio | 1.0m $240.8m | Added +352.7k |
| LORD, ABBETT & CO. LLC 0.38% of their portfolio | 893.5k $209.2m | Added +14.4k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.68% of their portfolio | 836.7k $195.8m | Added +3.3k |
| Champlain Investment Partners, LLC 0.97% of their portfolio | 656.3k $153.6m | Reduced -11.9k |
| STATE STREET CORP 0.01% of their portfolio | 630.8k $147.7m | Added +30.1k |
| MACQUARIE GROUP LTD 0.17% of their portfolio | 599.1k $140.2m | Reduced -461.6k |
| WELLINGTON MANAGEMENT GROUP LLP 0.03% of their portfolio | 585.5k $137.0m | Reduced -31.9k |
| WASATCH ADVISORS LP 0.85% of their portfolio | 583.6k $136.6m | Added +35.5k |
| FRED ALGER MANAGEMENT, LLC 0.69% of their portfolio | 548.2k $128.3m | Added +38.0k |
| GEODE CAPITAL MANAGEMENT, LLC 0.02% of their portfolio | 536.8k $125.6m | Added +30.4k |
| GILDER GAGNON HOWE & CO LLC 1.98% of their portfolio | 511.7k $119.8m | Reduced -25.1k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.70% of their portfolio | 422.6k $98.9m | Added +83.3k |
| Allspring Global Investments Holdings, LLC 0.16% of their portfolio | 418.1k $97.9m | Added +12.4k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.94% of their portfolio | 386.6k $90.5m | Added +28.5k |
| Bellevue Group AG 1.28% of their portfolio | 377.1k $88.3m | Reduced -24.7k |
| VIKING GLOBAL INVESTORS LP 0.38% of their portfolio | 346.6k $81.1m | Reduced -203.2k |
| FEDERATED HERMES, INC. 0.20% of their portfolio | 342.9k $80.3m | Added +102.9k |
| Driehaus Capital Management LLC 1.11% of their portfolio | 339.2k $79.4m | Added +41.7k |
| AMERIPRISE FINANCIAL INC 0.03% of their portfolio | 327.5k $76.6m | Reduced -10.0k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 323.1k $75.6m | Added +4.9k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.02% of their portfolio | 308.0k $72.1m | Added +986 |
| CITADEL ADVISORS LLC 0.08% of their portfolio | 305.2k $71.4m | Reduced -327.1k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 3.88% of their portfolio | 295.3k $69.1m | Reduced -3.8k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 293.2k $68.6m | Added +24.4k |
| LOOMIS SAYLES & CO L P 0.12% of their portfolio | 286.6k $67.1m | Added +2.3k |
| CREDIT SUISSE AG/ 0.07% of their portfolio | 286.4k $67.0m | Reduced -36.1k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 274.0k $64.1m | Reduced -4.3k |
| BAMCO INC /NY/ 0.19% of their portfolio | 268.9k $62.9m | Reduced -24.4k |
| Polar Capital Holdings Plc 0.46% of their portfolio | 268.6k $62.9m | New |
| NORGES BANK 0.01% of their portfolio | 247.6k $58.0m | Reduced -14.2k |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 0.34% of their portfolio | 242.6k $56.8m | Unchanged |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 231.4k $4.6m | Added +212.4k |
| D. E. Shaw & Co., Inc. 0.08% of their portfolio | 217.4k $50.9m | Added +76.7k |
| RENAISSANCE TECHNOLOGIES LLC 0.07% of their portfolio | 211.0k $49.4m | Added +170.2k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 194.3k $45.5m | Added +29.3k |
| VICTORY CAPITAL MANAGEMENT INC 0.05% of their portfolio | 188.2k $44.0m | Reduced -949 |
| 1832 Asset Management L.P. 0.09% of their portfolio | 184.5k $43.2m | New |
| MORGAN STANLEY 0.00% of their portfolio | 181.4k $42.5m | Added +50.6k |
| Point72 Asset Management, L.P. 0.14% of their portfolio | 170.6k $39.9m | Reduced -242.3k |
| JENNISON ASSOCIATES LLC 0.04% of their portfolio | 169.1k $39.6m | Added +408 |
| KEYBANK NATIONAL ASSOCIATION/OH 0.18% of their portfolio | 162.0k $37.9m | Reduced -320 |
| Thrivent Financial for Lutherans 0.09% of their portfolio | 161.9k $37.9m | Added +3.2k |
| MARSHALL WACE, LLP 0.09% of their portfolio | 157.9k $37.0m | Reduced -48.0k |
| Polar Asset Management Partners Inc. 0.64% of their portfolio | 153.5k $35.9m | Added +9.7k |
| MILLENNIUM MANAGEMENT LLC 0.04% of their portfolio | 152.1k $35.6m | Reduced -63.1k |
| Atika Capital Management LLC 5.16% of their portfolio | 141.4k $33.1m | Added +500 |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 134.6k $31.5m | Reduced -33.1k |
| Cubist Systematic Strategies, LLC 0.28% of their portfolio | 128.0k $30.0m | Added +88.3k |
| Granite Investment Partners, LLC 1.22% of their portfolio | 124.9k $29.2m | Reduced -2.7k |
| Amundi 0.01% of their portfolio | 121.2k $27.7m | Reduced -822 |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 119.6k $28.0m | Added +27.5k |
| Nicholas Investment Partners, LP 2.11% of their portfolio | 118.9k $27.8m | Added +37.1k |
| PRINCIPAL FINANCIAL GROUP INC 0.02% of their portfolio | 117.7k $27.6m | Added +12.1k |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 114.2k $26.7m | Added +12.7k |
| Artisan Partners Limited Partnership 0.04% of their portfolio | 111.6k $26.1m | Reduced -1.7k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.06% of their portfolio | 111.3k $26.0m | Added +11.3k |
| EVENTIDE ASSET MANAGEMENT, LLC 0.46% of their portfolio | 108.2k $25.3m | Unchanged |
| MAIRS & POWER INC 0.29% of their portfolio | 107.3k $25.1m | Reduced -18.3k |
| TimesSquare Capital Management, LLC 0.35% of their portfolio | 101.9k $23.9m | Reduced -48.9k |
| Eagle Health Investments LP 4.63% of their portfolio | 101.5k $23.8m | Unchanged |
| JANE STREET GROUP, LLC 0.04% of their portfolio | 100.0k $23.4m | Added +85.6k |
| STRS OHIO 0.04% of their portfolio | 99.6k $23.3m | Added +67.5k |
| Employees Retirement System of Texas 0.34% of their portfolio | 99.0k $23.2m | New |
| AMERICAN CENTURY COMPANIES INC 0.02% of their portfolio | 96.7k $22.6m | Added +95.6k |
| PURA VIDA INVESTMENTS, LLC 3.88% of their portfolio | 94.9k $22.2m | Reduced -106.1k |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 93.3k $21.8m | Reduced -4.6k |
| SEI INVESTMENTS CO 0.04% of their portfolio | 93.0k $21.8m | Added +70.1k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 88.5k $20.7m | Reduced -2.4k |
| EAGLE ASSET MANAGEMENT INC 0.12% of their portfolio | 87.9k $20.6m | Reduced -23.1k |
| Park West Asset Management LLC 1.86% of their portfolio | 86.5k $20.2m | New |
| Integral Health Asset Management, LLC 3.89% of their portfolio | 80.0k $18.7m | Added +20.0k |
| Quadrature Capital Ltd 0.49% of their portfolio | 76.6k $17.9m | Added +66.0k |
| Iron Triangle Partners LP 2.36% of their portfolio | 70.0k $16.4m | Reduced -10.0k |
| Swiss National Bank 0.01% of their portfolio | 62.3k $14.6m | Reduced -7.2k |
| NOVO HOLDINGS A/S 0.93% of their portfolio | 60.0k $14.0m | Reduced -3.3k |
| KORNITZER CAPITAL MANAGEMENT INC /KS 0.23% of their portfolio | 50.2k $11.7m | Unchanged |
| UBS Group AG 0.01% of their portfolio | 48.3k $11.3m | Added +7.7k |
| Man Group plc 0.04% of their portfolio | 47.5k $11.1m | New |
| California Public Employees Retirement System 0.01% of their portfolio | 45.6k $10.7m | Reduced -9.6k |
| Ensign Peak Advisors, Inc 0.02% of their portfolio | 42.2k $9.9m | Added +25.7k |
| Assenagon Asset Management S.A. 0.04% of their portfolio | 41.1k $9.6m | Reduced -298.6k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.03% of their portfolio | 40.1k $9.4m | Added +6.0k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 40.0k $9.4m | Added +1.6k |
| CASTLEARK MANAGEMENT LLC 0.45% of their portfolio | 39.5k $9.2m | Unchanged |
| SEGALL BRYANT & HAMILL, LLC 0.10% of their portfolio | 38.5k $9.0m | Added +481 |
| Rhenman & Partners Asset Management AB 1.00% of their portfolio | 38.4k $9.1m | Reduced -22.6k |
| BNP PARIBAS FINANCIAL MARKETS 0.02% of their portfolio | 38.4k $9.0m | Added +33.8k |
| LAZARD ASSET MANAGEMENT LLC 0.01% of their portfolio | 37.8k $8.8m | Added +473 |
| CANADA PENSION PLAN INVESTMENT BOARD 0.01% of their portfolio | 36.9k $8.6m | Reduced -4.3k |
| PRUDENTIAL FINANCIAL INC 0.01% of their portfolio | 36.3k $8.5m | Added +22.1k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 36.0k $8.4m | Reduced -290 |
| Squarepoint Ops LLC 0.06% of their portfolio | 35.8k $8.4m | Added +2.4k |
| Russell Investments Group, Ltd. 0.02% of their portfolio | 35.2k $8.2m | Reduced -5.2k |
| Bridgewater Associates, LP 0.05% of their portfolio | 35.2k $8.2m | Added +1.5k |
| AXIOM INVESTORS LLC /DE 0.14% of their portfolio | 35.1k $8.2m | Reduced -3.6k |
| OSTERWEIS CAPITAL MANAGEMENT INC 0.56% of their portfolio | 35.1k $8.2m | Added +3.1k |