ALGM
Allegro MicroSystems, Inc. · Technology · Semiconductors
Momentum inputs (comparable managers):
holder breadth -27.3% ·
share flow +30.0% ·
net new positions -20.0%
· formula
Concentrated accumulation: rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2024
| 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 | Wellington Management ✦ | 3.06M | New | $71.29M | 0.0% | New | 1 | SEC ↗ ×4 |
| 2 | Geode Capital Management ✦ (passive) | 2.56M | +86.5% | $59.70M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 3 | Adage Capital Partners ✦ | 1.82M | +21.7% | $42.44M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 4 | Two Sigma Investments ✦ | 1.38M | +59.4% | $32.15M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 5 | Citadel Advisors ✦ | 1.34M | +1094.6% | $31.22M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 6 | Norges Bank ✦ (passive) | 1.31M | +66.2% | $30.50M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 7 | Millennium Management ✦ | 673.07K | -33.5% | $15.68M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 8 | T. Rowe Price ✦ | 59.13K | +47.7% | $1.38M | 0.0% | ▲ Add | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Wellington Management | $71.29M | 0.0% |
Exited
| Bridgewater Associates | $2.67M | was 0.0% |
| Gotham Asset Management | $1.80M | was 0.0% |
| AQR Capital Management | $1.10M | was 0.0% |
| D. E. Shaw & Co. | $862,930 | was 0.0% |
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