INSP
Inspire Medical Systems, Inc. · Healthcare · Medical - Devices
Momentum inputs (comparable managers):
holder breadth +6.7% ·
share flow -6.2% ·
net new positions +6.2%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 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 | Wellington Management ✦ | 1.39M | -29.5% | $293.85M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 2 | Wellington Management ✦ | 1.39M | -29.5% | $293.85M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 3 | Wellington Management ✦ | 1.39M | -29.5% | $293.85M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 4 | Wellington Management ✦ | 1.39M | -29.5% | $293.85M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 5 | Wellington Management ✦ | 1.39M | -29.5% | $293.85M | 0.1% | ▼ Trim | 2 | SEC ↗ |
| 6 | Baillie Gifford ✦ | 1.37M | -4.2% | $288.47M | 0.2% | ▼ Trim | 2 | SEC ↗ |
| 7 | Baillie Gifford ✦ | 1.37M | -4.2% | $288.47M | 0.2% | ▼ Trim | 2 | SEC ↗ |
| 8 | Baillie Gifford ✦ | 1.37M | -4.2% | $288.47M | 0.2% | ▼ Trim | 2 | SEC ↗ |
| 9 | Baillie Gifford ✦ | 1.37M | -4.2% | $288.47M | 0.2% | ▼ Trim | 2 | SEC ↗ |
| 10 | Geode Capital Management ✦ (passive) | 483.65K | +0.7% | $102.10M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 11 | Geode Capital Management ✦ (passive) | 483.65K | +0.7% | $102.10M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 12 | AQR Capital Management ✦ | 446.41K | +92.5% | $93.39M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 13 | AQR Capital Management ✦ | 446.41K | +92.5% | $93.39M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 14 | AQR Capital Management ✦ | 446.41K | +92.5% | $93.39M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 15 | Point72 Asset Management ✦ | 319.36K | +954.4% | $67.40M | 0.2% | ▲ Add | 2 | SEC ↗ |
| 16 | Norges Bank ✦ (passive) | 277.97K | 0.0% | $58.67M | 0.0% | Held | 2 | SEC ↗ |
| 17 | T. Rowe Price ✦ | 164.10K | -55.0% | $34.64M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 18 | T. Rowe Price ✦ | 164.10K | -55.0% | $34.64M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 19 | Citadel Advisors ✦ | 110.31K | +248.5% | $23.28M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 20 | Citadel Advisors ✦ | 110.31K | +248.5% | $23.28M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 21 | Renaissance Technologies ✦ | 100.50K | +36.5% | $21.21M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 22 | Adage Capital Partners ✦ | 75.00K | -11.8% | $15.83M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 23 | Two Sigma Investments ✦ | 14.99K | -32.8% | $3.16M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 24 | Marshall Wace ✦ | 14.78K | -63.5% | $3.12M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 25 | Millennium Management ✦ | 7.53K | -76.7% | $1.59M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 26 | Bridgewater Associates ✦ | 4.54K | -14.2% | $958,167 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 27 | D. E. Shaw & Co. ✦ | 2.97K | -87.2% | $627,452 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 28 | D. E. Shaw & Co. ✦ | 2.97K | -87.2% | $627,452 | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 29 | Arrowstreet Capital ✦ | 2.09K | New | $441,517 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Arrowstreet Capital | $441,517 | 0.0% |
Exited
| No tracked exits this quarter. |
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