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-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
Conviction spread
INSP’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes INSP more heavily than its largest holder by dollar value does.
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 2026-Q1 and 2026-Q2, we do not read how tracked institutions changed their INSP positions: many holders could not be matched across the two filings, most often because the security’s identifier changed and our mapping is incomplete, or because funds are still filing for the newer quarter. Over the same quarter, open-market insider Form 4s were net sales.
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
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 4,737,519 | $211M | 13.4% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 2,382,660 | $106M | 6.7% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 2,088,961 | $93M | 5.9% | 2026-Q2 |
| Soleus Capital Management, L.P. added | 1,931,436 | $86M | 5.5% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 1,856,800 | $81M | 5.1% | 2026-Q2 |
| UBS Group AG added | 1,645,511 | $73M | 4.7% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 1,470,462 | $66M | 4.2% | 2026-Q2 |
| NOMURA HOLDINGS INC added | 1,369,410 | $61M | 3.9% | 2026-Q2 |
| DEERFIELD MANAGEMENT COMPANY, L.P. trimmed | 1,296,862 | $58M | 3.7% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,270,928 | $57M | 3.6% | 2026-Q2 |
| STATE STREET CORP added | 1,206,494 | $54M | 3.4% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 864,395 | $39M | 2.4% | 2026-Q2 |
| MORGAN STANLEY trimmed | 791,222 | $35M | 2.2% | 2026-Q2 |
| Artisan Partners Limited Partnership trimmed | 732,323 | $33M | 2.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 700,836 | $31M | 2.0% | 2026-Q2 |
| BRAIDWELL LP | 677,570 | $30M | 1.9% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 645,858 | $29M | 1.8% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 546,020 | $24M | 1.5% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 506,334 | $23M | 1.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 428,069 | $19M | 1.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 426,000 | $19M | 1.2% | 2026-Q2 |
| ADAR1 Capital Management, LLC trimmed | 374,617 | $17M | 1.1% | 2026-Q2 |
| Aberdeen Group plc trimmed | 358,968 | $16M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 334,039 | $15M | 0.9% | 2026-Q2 |
| BARCLAYS PLC added | 307,270 | $14M | 0.9% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 272,130 | $12M | 0.8% | 2026-Q2 |
| Nantahala Capital Management, LLC new | 269,474 | $12M | 0.8% | 2026-Q2 |
| FMR LLC added | 267,871 | $12M | 0.8% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 248,802 | $11M | 0.7% | 2026-Q2 |
| Walleye Capital LLC trimmed | 245,763 | $11M | 0.7% | 2026-Q2 |
| Rock Springs Capital Management LP added | 244,000 | $11M | 0.7% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. added | 219,873 | $10M | 0.6% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 210,091 | $9M | 0.6% | 2026-Q2 |
| NORGES BANK added | 198,272 | $9M | 0.6% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 190,563 | $9M | 0.5% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 176,200 | $8M | 0.5% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 169,095 | $8M | 0.5% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 167,733 | $7M | 0.5% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 165,100 | $7M | 0.5% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 148,627 | $7M | 0.4% | 2026-Q2 |
| BANK OF NOVA SCOTIA added | 144,964 | $6M | 0.4% | 2026-Q2 |
| Quantinno Capital Management LP added | 137,615 | $6M | 0.4% | 2026-Q2 |
| Edgestream Partners, L.P. added | 133,766 | $6M | 0.4% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 128,175 | $6M | 0.4% | 2026-Q2 |
| Alberta Investment Management Corp new | 122,900 | $5M | 0.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 115,907 | $5M | 0.3% | 2026-Q2 |
| Invesco Ltd. added | 110,285 | $5M | 0.3% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 107,657 | $5M | 0.3% | 2026-Q2 |
| Integral Health Asset Management, LLC added | 100,000 | $4M | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 94,149 | $4M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 90,077 | $4M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 87,518 | $4M | 0.2% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC trimmed | 87,185 | $4M | 0.2% | 2026-Q2 |
| CITIGROUP INC added | 77,780 | $3M | 0.2% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 72,413 | $3M | 0.2% | 2026-Q2 |
| Voleon Capital Management LP added | 72,218 | $3M | 0.2% | 2026-Q2 |
| Nuveen, LLC trimmed | 70,046 | $3M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 64,202 | $3M | 0.2% | 2026-Q2 |
| Legal & General Group Plc trimmed | 61,236 | $3M | 0.2% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 60,517 | $3M | 0.2% | 2026-Q2 |
| Corient Private Wealth LP added | 57,530 | $3M | 0.2% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd trimmed | 55,681 | $2M | 0.2% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 53,198 | $2M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 52,000 | $2M | 0.1% | 2026-Q2 |
| Empowered Funds, LLC added | 50,657 | $2M | 0.1% | 2026-Q2 |
| LPL Financial LLC added | 47,947 | $2M | 0.1% | 2026-Q2 |
| NORDEA INVESTMENT MANAGEMENT AB added | 44,381 | $2M | 0.1% | 2026-Q2 |
| BROWN CAPITAL MANAGEMENT LLC trimmed | 43,951 | $2M | 0.1% | 2026-Q2 |
| Brevan Howard Capital Management LP added | 43,158 | $2M | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 41,988 | $2M | 0.1% | 2026-Q2 |
| WINTON GROUP Ltd added | 37,412 | $2M | 0.1% | 2026-Q2 |
| Creative Planning added | 37,373 | $2M | 0.1% | 2026-Q2 |
| Entropy Technologies, LP added | 37,293 | $2M | 0.1% | 2026-Q2 |
| Gotham Asset Management, LLC trimmed | 35,823 | $2M | 0.1% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 34,238 | $2M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 33,715 | $2M | 0.1% | 2026-Q2 |
| Jump Financial, LLC added | 31,926 | $1M | 0.1% | 2026-Q2 |
| Mariner, LLC added | 30,190 | $1M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 29,771 | $1M | 0.1% | 2026-Q2 |
| AXQ CAPITAL, LP trimmed | 29,630 | $1M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 29,526 | $1M | 0.1% | 2026-Q2 |
| WORLDQUANT MILLENNIUM ADVISORS LLC trimmed | 28,359 | $1M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 27,720 | $1M | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 27,693 | $1M | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 26,412 | $1M | 0.1% | 2026-Q2 |
| Odyssean, LLC new | 26,282 | $1M | 0.1% | 2026-Q2 |
| Quantbot Technologies LP trimmed | 25,954 | $1M | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP trimmed | 25,704 | $1M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 25,473 | $1M | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV added | 24,944 | $1M | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 24,259 | $1M | 0.1% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 21,840 | $974K | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 21,530 | $960K | 0.1% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC trimmed | 21,255 | $948K | 0.1% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 20,525 | $916K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 20,099 | $897K | 0.1% | 2026-Q2 |
| Cerity Partners LLC trimmed | 19,959 | $890K | 0.1% | 2026-Q2 |
| TD Asset Management Inc | 19,290 | $861K | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 18,780 | $838K | 0.1% | 2026-Q2 |
| DAFNA Capital Management LLC | 18,200 | $812K | 0.1% | 2026-Q2 |
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.