Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in INSP held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 3.5M | $183.1M | -0.0% | 12.319% | 0.00% |
| 2 | DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C) | 2.7M | $139.4M | +79.5% | 9.382% | 1.64% |
| 3 | WELLINGTON MANAGEMENT GROUP LLP | 2.5M | $130.8M | +14.7% | 8.801% | 0.02% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 1.6M | $84.4M | — | 5.682% | 0.00% |
| 5 | MORGAN STANLEY | 1.5M | $74.8M | +15.2% | 5.035% | 0.00% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 1.3M | $65.3M | — | 4.396% | 0.00% |
| 7 | D. E. Shaw & Co., Inc. | 1.2M | $61.9M | -1.0% | 4.163% | 0.06% |
| 8 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1.1M | $58.7M | -2.1% | 3.947% | 0.19% |
| 9 | STATE STREET CORP | 956K | $49.3M | +4.1% | 3.318% | 0.00% |
| 10 | Artisan Partners Limited Partnership | 781K | $40.3M | -0.7% | 2.709% | 0.07% |
| 11 | BRAIDWELL LP | 678K | $34.9M | +25.3% | 2.352% | 1.17% |
| 12 | GOLDMAN SACHS GROUP INC | 664K | $34.2M | +133.1% | 2.304% | 0.00% |
| 13 | UBS Group AG | 639K | $33.0M | +55.3% | 2.218% | 0.00% |
| 14 | Soleus Capital Management, L.P. | 576K | $29.7M | +92.5% | 2.000% | 1.20% |
| 15 | Vestal Point Capital, LP | 539K | $27.8M | — | 1.872% | 0.78% |
| 16 | Assenagon Asset Management S.A. | 520K | $26.8M | +96.3% | 1.805% | 0.04% |
| 17 | DEUTSCHE BANK AG\ | 513K | $26.5M | -0.7% | 1.781% | 0.01% |
| 18 | GEODE CAPITAL MANAGEMENT, LLC | 510K | $26.3M | +3.8% | 1.771% | 0.00% |
| 19 | CITADEL ADVISORS LLC | 483K | $24.9M | -14.1% | 1.677% | 0.01% |
| 20 | abrdn plc | 477K | $24.6M | +3.6% | 1.657% | 0.04% |
| 21 | RENAISSANCE TECHNOLOGIES LLC | 470K | $24.2M | +14.4% | 1.631% | 0.04% |
| 22 | UBS ASSET MANAGEMENT AMERICAS INC | 449K | $23.1M | -3.1% | 1.558% | 0.00% |
| 23 | ADAR1 Capital Management, LLC | 405K | $20.9M | +2601.3% | 1.406% | 1.31% |
| 24 | Walleye Capital LLC | 359K | $18.5M | +353.1% | 1.247% | 0.08% |
| 25 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 354K | $18.2M | +20.3% | 1.228% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in INSP — a direct measure of their conviction.
Filings activity in INSP during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 293 | 14% | 141.40% | 58.59 pp | $1.74B | 44% |
| Q4 2025 | 340 | +7.9% | 199.99% | +12.79 pp | $3.12B | +35% |
| Q3 2025 | 315 | 11% | 187.20% | 12.79 pp | $2.30B | 47% |
| Q2 2025 | 352 | 0.6% | 199.99% | +0.00 pp | $4.31B | 20% |
| Q1 2025 | 354 | +1.4% | 199.99% | +0.00 pp | $5.38B | 11% |
| Q4 2024 | 349 | +4.5% | 199.99% | +0.00 pp | $6.04B | 12% |
| Q3 2024 | 334 | +6.4% | 199.99% | +0.00 pp | $6.84B | +67% |
| Q2 2024 | 314 | — | 199.99% | — | $4.09B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying INSP stock.
Based on Q1 2026 13F filings, institutional ownership of Inspire Medical Systems, Inc. stands at 141.4%, held across 293 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of INSP, with approximately 3,549,554 shares worth $0.18B as of Q1 2026.
Yes — 3 widely-followed marquee investors appear among the top 25 institutional holders of INSP, including CITADEL ADVISORS LLC, RENAISSANCE TECHNOLOGIES LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for INSP is 39 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
58 institutions opened new positions in INSP during Q1 2026, while 105 fully exited. 51 added to existing positions and 183 trimmed.
INSP institutional ownership fell by 58.59 percentage points quarter-over-quarter, with a net change of -47 holders.
The top 10 institutions account for 51.0% of all reported 13F value in INSP, and the top 25 account for 73.7%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Inspire Medical Systems, Inc. (INSP) Institutional Ownership