Security record
ALGM
Allegro MicroSystems, Inc. · Technology · Semiconductors
111Tracked holders
+5Δ holders
129.92MShares held
$8.95BReported value
+15New positions
−9Exits
Momentum inputs (comparable managers):
holder breadth +4.7% ·
share flow +9.9% ·
net new positions +5.4%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2026
Ownership over time
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 111 | +5 | 129.92M | $8.95B | +15 | −9 |
| Q1 2026 | 108 | -8 | 117.16M | $3.65B | +5 | −14 |
| Q4 2025 | 117 | +2 | 125.26M | $3.30B | +3 | — |
| Q3 2025 | 18 | 0 | 84.17M | $2.46B | +1 | −2 |
| Q2 2025 | 16 | +3 | 70.10M | $2.40B | +3 | — |
| Q1 2025 | 10 | 0 | 21.03M | $528.55M | +1 | −1 |
| Q4 2024 | 10 | +1 | 20.68M | $452.03M | +1 | — |
| Q3 2024 | 8 | -3 | 12.20M | $284.36M | +1 | −4 |
| Q2 2024 | 11 | — | 5.92M | $167.08M | — | — |
Who holds it · Q2 2026
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Fidelity (FMR) ✦ | 25.58M | -6.7% | $1.78B | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 2 | Fidelity (FMR) ✦ | 25.58M | -6.7% | $1.78B | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 3 | Fidelity (FMR) ✦ | 25.58M | -6.7% | $1.78B | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 4 | Fidelity (FMR) ✦ | 25.58M | -6.7% | $1.78B | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 5 | Fidelity (FMR) ✦ | 25.58M | -6.7% | $1.78B | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 6 | Fidelity (FMR) ✦ | 25.58M | -6.7% | $1.78B | 0.1% | ▼ Trim | 5 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 20 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 21 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 22 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 23 | BlackRock ✦ (passive) | 13.89M | +11.2% | $966.97M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 24 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 25 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 26 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 27 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 28 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 29 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 30 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 31 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 32 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 33 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 34 | Invesco Ltd. | 13.68M | +56.3% | $952.29M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 35 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 36 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 37 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 38 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 39 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 40 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 41 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 42 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 43 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 44 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 45 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 46 | JPMorgan Chase ✦ | 12.72M | +47.1% | $844.87M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 47 | Capital Research Global Investors | 12.01M | -3.5% | $835.89M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 48 | State Street Global Advisors ✦ (passive) | 5.68M | +8.6% | $395.19M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 49 | Vanguard Capital Management Llc | 5.51M | +0.8% | $383.52M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 50 | T. Rowe Price ✦ | 3.71M | +3160.4% | $258.31M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 51 | T. Rowe Price ✦ | 3.71M | +3160.4% | $258.31M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 52 | Clearbridge Investments, LLC | 2.95M | +2.9% | $205.12M | 0.2% | ▲ Add | 3 | SEC ↗ |
| 53 | Geode Capital Management ✦ (passive) | 2.64M | +7.7% | $184.18M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 54 | Geode Capital Management ✦ (passive) | 2.64M | +7.7% | $184.18M | 0.0% | ▲ Add | 9 | SEC ↗ |
| 55 | Dimensional Fund Advisors Lp | 2.12M | -2.1% | $147.85M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 56 | Dimensional Fund Advisors Lp | 2.12M | -2.1% | $147.85M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 57 | Dimensional Fund Advisors Lp | 2.12M | -2.1% | $147.85M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 58 | Dimensional Fund Advisors Lp | 2.12M | -2.1% | $147.85M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 59 | Dimensional Fund Advisors Lp | 2.12M | -2.1% | $147.85M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 60 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 61 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 62 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 63 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 64 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 65 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 66 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 67 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 68 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 69 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 70 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 71 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 72 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 73 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 74 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 75 | Morgan Stanley ✦ | 1.81M | -20.5% | $125.97M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 76 | Loomis Sayles & Co L P | 1.62M | -3.2% | $112.78M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 77 | Loomis Sayles & Co L P | 1.62M | -3.2% | $112.78M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 78 | Goldman Sachs Group ✦ | 1.58M | +9.6% | $109.66M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 79 | Goldman Sachs Group ✦ | 1.58M | +9.6% | $109.66M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 80 | Goldman Sachs Group ✦ | 1.58M | +9.6% | $109.66M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 81 | Goldman Sachs Group ✦ | 1.58M | +9.6% | $109.66M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 82 | Goldman Sachs Group ✦ | 1.58M | +9.6% | $109.66M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 83 | Principal Financial Group Inc | 1.49M | -16.8% | $103.72M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 84 | Massachusetts Financial Services Co… | 1.44M | +1983.1% | $100.49M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 85 | Massachusetts Financial Services Co… | 1.44M | +1983.1% | $100.49M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 86 | Massachusetts Financial Services Co… | 1.44M | +1983.1% | $100.49M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 87 | Massachusetts Financial Services Co… | 1.44M | +1983.1% | $100.49M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 88 | Massachusetts Financial Services Co… | 1.44M | +1983.1% | $100.49M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 89 | Massachusetts Financial Services Co… | 1.44M | +1983.1% | $100.49M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 90 | Charles Schwab Investment… | 1.36M | -2.2% | $94.72M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 91 | Charles Schwab Investment… | 1.36M | -2.2% | $94.72M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 92 | Norges Bank ✦ (passive) | 1.29M | New | $90.15M | 0.0% | New | 1 | SEC ↗ |
| 93 | Northern Trust Corp | 1.17M | +11.6% | $81.26M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 94 | Northern Trust Corp | 1.17M | +11.6% | $81.26M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 95 | Northern Trust Corp | 1.17M | +11.6% | $81.26M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 96 | Northern Trust Corp | 1.17M | +11.6% | $81.26M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 97 | Northern Trust Corp | 1.17M | +11.6% | $81.26M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 98 | Northern Trust Corp | 1.17M | +11.6% | $81.26M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 99 | Nomura Asset Management… | 1.16M | -44.3% | $80.72M | 0.1% | ▼ Trim | 3 | SEC ↗ |
| 100 | Adage Capital Partners ✦ | 1.12M | -23.4% | $78.11M | 0.1% | ▼ Trim | 9 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Norges Bank | $90.15M | 0.0% |
Exited
| Citadel Advisors | $12.59M | was 0.0% |
| Renaissance Technologies | $3.91M | was 0.0% |
| Tudor Investment Corp Et Al | $1.17M | was 0.0% |
| Millennium Management | $886,844 | was 0.0% |
| Bridgewater Associates | $524,817 | was 0.0% |
| Peak6 Llc | $488,810 | was 0.0% |
| Mml Investors Services, Llc | $346,045 | was 0.0% |
| Walleye Trading LLC | $110,828 | was 0.0% |
| Simplex Trading, Llc | $4,855 | 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.
Frequently co-owned
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)
Aug 17
Raubacher Jennie
Director · 1.00K sh · $45,320
Aug 10
Hagen Erin
Officer · 2.29K sh · $101,431
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology
Aug 13
SC 13G — Invesco Ltd.
Aug 06
SC 13G/A — FMR LLC
Jul 27
SC 13G/A — BlackRock, Inc.
Jul 16
SC 13G — JPMORGAN CHASE & CO
Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR.
Reporting period: Q2 2026 ·
Methodology ·
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