ALGM
Allegro MicroSystems, Inc. · Technology · Semiconductors
Momentum inputs (comparable managers):
holder breadth +23.1% ·
share flow -5.6% ·
net new positions +18.8%
· formula
Ownership fragmentation: more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 2 | 0 | 18.58K | $674,166 | n/a | −1 |
| Q2 2026 | 109 | +3 | 129.87M | $8.95B | +13 | −9 |
| Q1 2026 | 108 | -8 | 117.16M | $3.65B | +5 | −14 |
| Q4 2025 | 117 | +2 | 125.26M | $3.30B | +3 | n/a |
| Q3 2025 | 18 | 0 | 84.17M | $2.46B | +1 | −2 |
| Q2 2025 | 16 | +3 | 70.10M | $2.40B | +3 | n/a |
| Q1 2025 | 10 | 0 | 21.03M | $528.55M | +1 | −1 |
| Q4 2024 | 10 | +1 | 20.68M | $452.03M | +1 | n/a |
| Q3 2024 | 8 | -3 | 12.20M | $284.36M | +1 | −4 |
| Q2 2024 | 11 | n/a | 5.92M | $167.08M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Fidelity (FMR) ✦ | 27.25M | n/a | $931.59M | 0.1% | n/c | 1 | SEC ↗ ×5 |
| 2 | The Vanguard Group ✦ (passive) | 14.21M | n/a | $485.70M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 3 | State Street Global Advisors ✦ (passive) | 5.19M | +2.1% | $177.55M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 4 | Wellington Management ✦ | 2.64M | -18.8% | $90.15M | 0.0% | ▼ Trim | 4 | SEC ↗ ×5 |
| 5 | Geode Capital Management ✦ (passive) | 2.41M | +0.8% | $82.27M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
| 6 | Adage Capital Partners ✦ | 2.18M | +3.3% | $74.45M | 0.1% | ▲ Add | 5 | SEC ↗ |
| 7 | Citadel Advisors ✦ | 1.52M | -64.9% | $51.95M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 8 | Norges Bank ✦ (passive) | 1.41M | +11.2% | $48.14M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 9 | Millennium Management ✦ | 679.62K | -71.7% | $23.24M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 10 | Two Sigma Investments ✦ | 346.81K | +218.2% | $11.86M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 11 | Point72 Asset Management ✦ | 294.56K | New | $10.07M | 0.0% | New | 1 | SEC ↗ |
| 12 | T. Rowe Price ✦ | 89.33K | +15.6% | $3.06M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 13 | Bridgewater Associates ✦ | 77.32K | New | $2.64M | 0.0% | New | 1 | SEC ↗ |
| 14 | AQR Capital Management ✦ | 20.73K | +50.6% | $698,168 | 0.0% | ▲ Add | 2 | SEC ↗ ×4 |
| 15 | Gotham Asset Management ✦ | 8.35K | New | $285,487 | 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
| Point72 Asset Management | $10.07M | 0.0% |
| Bridgewater Associates | $2.64M | 0.0% |
| Gotham Asset Management | $285,487 | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 316 holders, 129.66M shares, $4.00B 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)
Director · 1.00K sh · $45,320
Officer · 2.29K sh · $101,431
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology