Who owns Inspire Medical Systems (INSP)
Which tracked institutional funds hold INSP, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See INSP company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on INSP is one-sided between 2026-Q1 and 2026-Q2: 8 added or opened and 143 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
INSP’s largest tracked holder by dollar value, Dragoneer Investment Group, LLC, sizes it at 10.2% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 10.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in INSP divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 301 tracked filers holding INSP, 180 increased or opened the position and 198 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in INSP between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 1
- ExodusPoint Capital Management, LP$1M
Full exits 135
- DEERFIELD MANAGEMENT COMPANY, L.P.$139M
- VANGUARD PORTFOLIO MANAGEMENT LLC$84M
- MORGAN STANLEY$75M
- VANGUARD CAPITAL MANAGEMENT LLC$65M
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$59M
- Artisan Partners Limited Partnership$40M
Largest adds
- AQR CAPITAL MANAGEMENT LLC$65M
- BlackRock, Inc.$28M
- FMR LLC$10M
- STATE STREET CORP$5M
- D. E. Shaw & Co., Inc.$4M
- CITADEL ADVISORS LLC$2M
Largest trims
- WELLINGTON MANAGEMENT GROUP LLP$22M
- NORGES BANK$17M
- MILLENNIUM MANAGEMENT LLC$16M
- RENAISSANCE TECHNOLOGIES LLC$5M
- PRICE T ROWE ASSOCIATES INC /MD/$2M
- TUDOR INVESTMENT CORP ET AL$1M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 4,737,519 | $211M | 7.2% | 2026-Q2 |
| DEERFIELD MANAGEMENT COMPANY, L.P. added | 2,703,238 | $139M | 4.8% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 2,382,660 | $106M | 3.6% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 1,637,173 | $84M | 2.9% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 1,856,800 | $81M | 2.8% | 2026-Q2 |
| MORGAN STANLEY added | 1,450,634 | $75M | 2.6% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 1,470,462 | $66M | 2.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,266,738 | $65M | 2.2% | 2026-Q1 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 1,137,384 | $59M | 2.0% | 2026-Q1 |
| STATE STREET CORP added | 1,206,494 | $54M | 1.8% | 2026-Q2 |
| Artisan Partners Limited Partnership trimmed | 780,575 | $40M | 1.4% | 2026-Q1 |
| BRAIDWELL LP added | 677,570 | $35M | 1.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 664,003 | $34M | 1.2% | 2026-Q1 |
| UBS Group AG added | 638,928 | $33M | 1.1% | 2026-Q1 |
| Soleus Capital Management, L.P. added | 576,299 | $30M | 1.0% | 2026-Q1 |
| Vestal Point Capital, LP added | 539,269 | $28M | 1.0% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 520,174 | $27M | 0.9% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 513,175 | $26M | 0.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 510,234 | $26M | 0.9% | 2026-Q1 |
| Aberdeen Group plc added | 477,476 | $25M | 0.8% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 448,787 | $23M | 0.8% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 506,334 | $23M | 0.8% | 2026-Q2 |
| ADAR1 Capital Management, LLC added | 405,197 | $21M | 0.7% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 426,000 | $19M | 0.7% | 2026-Q2 |
| Walleye Capital LLC added | 358,489 | $18M | 0.6% | 2026-Q1 |
| RA CAPITAL MANAGEMENT, L.P. added | 325,663 | $17M | 0.6% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 319,758 | $16M | 0.6% | 2026-Q1 |
| Jefferies Financial Group Inc. trimmed | 306,423 | $16M | 0.5% | 2026-Q1 |
| BAMCO INC /NY/ trimmed | 298,470 | $15M | 0.5% | 2026-Q1 |
| Amundi trimmed | 256,830 | $13M | 0.5% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 252,971 | $13M | 0.4% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 234,670 | $12M | 0.4% | 2026-Q1 |
| FMR LLC added | 267,871 | $12M | 0.4% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 210,573 | $11M | 0.4% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 209,486 | $11M | 0.4% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 197,033 | $10M | 0.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 186,069 | $10M | 0.3% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 183,351 | $9M | 0.3% | 2026-Q1 |
| Cerity Partners LLC added | 181,426 | $9M | 0.3% | 2026-Q1 |
| Bridgewater Associates, LP added | 173,533 | $9M | 0.3% | 2026-Q1 |
| NORGES BANK added | 198,272 | $9M | 0.3% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO new | 167,700 | $9M | 0.3% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 164,100 | $8M | 0.3% | 2026-Q1 |
| Champlain Investment Partners, LLC trimmed | 158,989 | $8M | 0.3% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd added | 158,274 | $8M | 0.3% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 151,856 | $8M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 148,764 | $8M | 0.3% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 169,095 | $8M | 0.3% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 167,733 | $7M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 143,451 | $7M | 0.3% | 2026-Q1 |
| Longaeva Partners L.P. new | 138,761 | $7M | 0.2% | 2026-Q1 |
| WASATCH ADVISORS LP added | 138,603 | $7M | 0.2% | 2026-Q1 |
| Regal Partners Ltd trimmed | 135,767 | $7M | 0.2% | 2026-Q1 |
| LOS ANGELES CAPITAL MANAGEMENT LLC added | 132,954 | $7M | 0.2% | 2026-Q1 |
| Rock Springs Capital Management LP added | 131,800 | $7M | 0.2% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 126,788 | $7M | 0.2% | 2026-Q1 |
| Trexquant Investment LP trimmed | 121,490 | $6M | 0.2% | 2026-Q1 |
| Rheos Capital Works Inc. | 117,400 | $6M | 0.2% | 2026-Q1 |
| CAPITAL FUND MANAGEMENT S.A. trimmed | 109,015 | $6M | 0.2% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC added | 106,157 | $5M | 0.2% | 2026-Q1 |
| SG Americas Securities, LLC added | 105,147 | $5M | 0.2% | 2026-Q1 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 100,207 | $5M | 0.2% | 2026-Q1 |
| Bellevue Group AG trimmed | 99,735 | $5M | 0.2% | 2026-Q1 |
| Dragoneer Investment Group, LLC added | 2,354,411 | $306M | 10.5% | 2025-Q2 stale |
| VANGUARD GROUP INC trimmed | 2,953,170 | $272M | 9.3% | 2025-Q4 stale |
| BAILLIE GIFFORD & CO trimmed | 1,084,350 | $80M | 2.8% | 2025-Q3 stale |
| TimesSquare Capital Management, LLC added | 499,199 | $65M | 2.2% | 2025-Q2 stale |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 668,099 | $62M | 2.1% | 2025-Q4 stale |
| MARSHALL WACE, LLP added | 531,079 | $49M | 1.7% | 2025-Q4 stale |
| EVENTIDE ASSET MANAGEMENT, LLC added | 440,205 | $41M | 1.4% | 2025-Q4 stale |
| Driehaus Capital Management LLC added | 348,500 | $32M | 1.1% | 2025-Q4 stale |
| JANE STREET GROUP, LLC added | 277,199 | $26M | 0.9% | 2025-Q4 stale |
| Eversept Partners, LP trimmed | 164,473 | $21M | 0.7% | 2025-Q2 stale |
| Tri Locum Partners LP added | 149,244 | $19M | 0.7% | 2025-Q2 stale |
| KEYBANK NATIONAL ASSOCIATION/OH added | 200,042 | $18M | 0.6% | 2025-Q4 stale |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 110,594 | $18M | 0.6% | 2025-Q1 stale |
| M&T Bank Corp added | 931,049 | $15M | 0.5% | 2025-Q4 stale |
| Atika Capital Management LLC added | 187,600 | $14M | 0.5% | 2025-Q3 stale |
| Catalio Capital Management, LP new | 85,877 | $14M | 0.5% | 2025-Q1 stale |
| CAISSE DE DEPOT ET PLACEMENT DU QUEBEC added | 85,167 | $14M | 0.5% | 2025-Q1 stale |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 142,007 | $13M | 0.4% | 2025-Q4 stale |
| NEUBERGER BERMAN GROUP LLC trimmed | 99,791 | $13M | 0.4% | 2025-Q2 stale |
| Eagle Health Investments LP trimmed | 81,121 | $13M | 0.4% | 2025-Q1 stale |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 136,420 | $13M | 0.4% | 2025-Q4 stale |
| HRT FINANCIAL LP added | 121,761 | $11M | 0.4% | 2025-Q4 stale |
| M&G PLC added | 144,960 | $11M | 0.4% | 2025-Q3 stale |
| ING GROEP NV added | 88,300 | $8M | 0.3% | 2025-Q4 stale |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 107,032 | $8M | 0.3% | 2025-Q3 stale |
| Cubist Systematic Strategies, LLC new | 97,387 | $7M | 0.2% | 2025-Q3 stale |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 76,028 | $7M | 0.2% | 2025-Q4 stale |
| Integral Health Asset Management, LLC trimmed | 75,000 | $7M | 0.2% | 2025-Q4 stale |
| Impax Asset Management Group plc | 50,000 | $6M | 0.2% | 2025-Q2 stale |
| CW Advisors, LLC added | 49,960 | $6M | 0.2% | 2025-Q2 stale |
| CREDIT AGRICOLE S A trimmed | 67,695 | $6M | 0.2% | 2025-Q4 stale |
| JENNISON ASSOCIATES LLC trimmed | 45,439 | $6M | 0.2% | 2025-Q2 stale |
| NOMURA HOLDINGS INC new | 60,950 | $6M | 0.2% | 2025-Q4 stale |
| MAIRS & POWER INC trimmed | 57,616 | $5M | 0.2% | 2025-Q4 stale |
| OSTERWEIS CAPITAL MANAGEMENT INC new | 33,143 | $5M | 0.2% | 2025-Q1 stale |
| Beck Bode, LLC added | 40,537 | $5M | 0.2% | 2025-Q2 stale |
| California Public Employees Retirement System added | 38,537 | $5M | 0.2% | 2025-Q2 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.