INSP
Inspire Medical Systems, Inc. · Healthcare · Medical - Devices
Momentum inputs (comparable managers):
holder breadth -11.8% ·
share flow -29.2% ·
net new positions -13.3%
— formula
Broad distribution — falling shares and fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 99 | -1 | 27.80M | $1.24B | +14 | −14 |
| Q1 2026 | 102 | -7 | 22.50M | $1.16B | +11 | −19 |
| Q4 2025 | 110 | 0 | 24.43M | $2.25B | +3 | −2 |
| Q3 2025 | 20 | +2 | 13.81M | $1.03B | +2 | −1 |
| Q2 2025 | 16 | -1 | 12.85M | $1.67B | +1 | −2 |
| Q1 2025 | 14 | -1 | 3.76M | $597.97M | — | −1 |
| Q4 2024 | 15 | -2 | 4.14M | $766.98M | — | −2 |
| Q3 2024 | 16 | +1 | 4.78M | $1.01B | +1 | — |
| Q2 2024 | 15 | — | 5.10M | $682.73M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Baillie Gifford ✦ | 1.26M | -8.1% | $232.84M | 0.2% | ▼ Trim | 3 | SEC ↗ |
| 2 | Baillie Gifford ✦ | 1.26M | -8.1% | $232.84M | 0.2% | ▼ Trim | 3 | SEC ↗ |
| 3 | Baillie Gifford ✦ | 1.26M | -8.1% | $232.84M | 0.2% | ▼ Trim | 3 | SEC ↗ |
| 4 | Baillie Gifford ✦ | 1.26M | -8.1% | $232.84M | 0.2% | ▼ Trim | 3 | SEC ↗ |
| 5 | State Street Global Advisors ✦ (passive) | 1.06M | — | $196.90M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | Geode Capital Management ✦ (passive) | 486.34K | +0.6% | $90.19M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 7 | Geode Capital Management ✦ (passive) | 486.34K | +0.6% | $90.19M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 8 | AQR Capital Management ✦ | 438.84K | -1.7% | $81.35M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 9 | AQR Capital Management ✦ | 438.84K | -1.7% | $81.35M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 10 | AQR Capital Management ✦ | 438.84K | -1.7% | $81.35M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 11 | AQR Capital Management ✦ | 438.84K | -1.7% | $81.35M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 12 | Marshall Wace ✦ | 277.13K | +1775.3% | $51.37M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 13 | Marshall Wace ✦ | 277.13K | +1775.3% | $51.37M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 14 | Wellington Management ✦ | 244.39K | -82.5% | $45.30M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 15 | Wellington Management ✦ | 244.39K | -82.5% | $45.30M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 16 | Wellington Management ✦ | 244.39K | -82.5% | $45.30M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 17 | Wellington Management ✦ | 244.39K | -82.5% | $45.30M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 18 | Wellington Management ✦ | 244.39K | -82.5% | $45.30M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 19 | Renaissance Technologies ✦ | 136.70K | +36.0% | $25.34M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 20 | T. Rowe Price ✦ | 57.93K | -64.7% | $10.74M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 21 | T. Rowe Price ✦ | 57.93K | -64.7% | $10.74M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 22 | Norges Bank ✦ (passive) | 57.62K | -79.3% | $10.68M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 23 | Citadel Advisors ✦ | 52.42K | -52.5% | $9.72M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 24 | Citadel Advisors ✦ | 52.42K | -52.5% | $9.72M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 25 | Arrowstreet Capital ✦ | 35.29K | +1587.1% | $6.54M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 26 | Two Sigma Investments ✦ | 16.38K | +9.3% | $3.04M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 27 | D. E. Shaw & Co. ✦ | 7.75K | +160.8% | $1.44M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 28 | D. E. Shaw & Co. ✦ | 7.75K | +160.8% | $1.44M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 29 | Millennium Management ✦ | 5.05K | -32.9% | $936,354 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 30 | Bridgewater Associates ✦ | 3.16K | -30.4% | $586,172 | 0.0% | ▼ Trim | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| Point72 Asset Management | $67.40M | was 0.2% |
| Adage Capital Partners | $15.83M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 298 holders, 34.81M shares, $1.75B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 963 sh · $57,347
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology