Security record · archived quarter
ALGM
Allegro MicroSystems, Inc. · Technology · Semiconductors
117Tracked holders
+2Δ holders
125.26MShares held
$3.30BReported value
+3New positions
−0Exits
Momentum inputs (comparable managers):
holder breadth +1.7% ·
share flow -3.9% ·
net new positions +2.6%
· formula
Ownership fragmentation: more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2025
Ownership over time
| 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 |
Who holds it · Q4 2025
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Fidelity (FMR) ✦ | 23.64M | -13.9% | $623.51M | 0.0% | ▼ Trim | 3 | SEC ↗ ×5 |
| 2 | The Vanguard Group ✦ (passive) | 14.20M | -0.6% | $374.66M | 0.0% | ▼ Trim | 3 | SEC ↗ ×5 |
| 3 | Capital Research Global Investors | 13.11M | n/a | $345.88M | 0.1% | n/c | 1 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 12.20M | +7.2% | $321.87M | 0.0% | ▲ Add | 3 | SEC ↗ ×16 |
| 5 | Invesco Ltd. | 7.65M | n/a | $201.83M | 0.0% | n/c | 1 | SEC ↗ ×7 |
| 6 | JPMorgan Chase ✦ | 7.35M | -52.5% | $193.83M | 0.0% | ▼ Trim | 2 | SEC ↗ ×10 |
| 7 | State Street Global Advisors ✦ (passive) | 5.36M | +1.5% | $141.38M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 8 | Clearbridge Investments, LLC | 2.92M | n/a | $76.94M | 0.1% | n/c | 1 | SEC ↗ |
| 9 | Adage Capital Partners ✦ | 2.80M | +77.8% | $73.97M | 0.1% | ▲ Add | 7 | SEC ↗ |
| 10 | Citadel Advisors ✦ | 2.56M | +672.1% | $67.55M | 0.0% | ▲ Add | 7 | SEC ↗ ×2 |
| 11 | Geode Capital Management ✦ (passive) | 2.39M | +1.1% | $63.17M | 0.0% | ▲ Add | 7 | SEC ↗ ×2 |
| 12 | Morgan Stanley ✦ | 2.23M | +15.2% | $58.91M | 0.0% | ▲ Add | 2 | SEC ↗ ×16 |
| 13 | Dimensional Fund Advisors Lp | 2.14M | n/a | $56.46M | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 14 | Nomura Asset Management… | 2.04M | n/a | $53.72M | 0.1% | n/c | 1 | SEC ↗ |
| 15 | Principal Financial Group Inc | 1.74M | n/a | $45.96M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 16 | Norges Bank ✦ (passive) | 1.46M | New | $38.46M | 0.0% | New | 1 | SEC ↗ |
| 17 | Charles Schwab Investment… | 1.36M | n/a | $35.94M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | Millennium Management ✦ | 1.34M | +67.2% | $35.40M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 19 | Alliancebernstein L.P. | 1.15M | n/a | $30.30M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | Point72 Asset Management ✦ | 1.12M | +13.4% | $29.53M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | Wellington Management ✦ | 1.11M | -4.7% | $29.19M | 0.0% | ▼ Trim | 6 | SEC ↗ ×4 |
| 22 | Northern Trust Corp | 1.01M | n/a | $26.78M | 0.0% | n/c | 1 | SEC ↗ ×6 |
| 23 | Voya Investment Management Llc | 940.36K | n/a | $24.81M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 24 | Raymond James Financial Inc | 908.44K | n/a | $23.96M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 25 | Loomis Sayles & Co L P | 829.24K | n/a | $21.88M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 26 | Balyasny Asset Management L.P. | 810.46K | n/a | $21.38M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 27 | Goldman Sachs Group ✦ | 796.33K | +130.6% | $21.01M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 28 | Bank of New York Mellon Corp | 750.59K | n/a | $19.80M | 0.0% | n/c | 1 | SEC ↗ ×11 |
| 29 | Marshall Wace ✦ | 714.58K | +417.5% | $18.85M | 0.0% | ▲ Add | 2 | SEC ↗ ×4 |
| 30 | Bank Of America Corp /De/ | 576.65K | n/a | $15.21M | 0.0% | n/c | 1 | SEC ↗ ×7 |
| 31 | First Trust Advisors Lp | 448.98K | n/a | $11.84M | 0.0% | n/c | 1 | SEC ↗ |
| 32 | Renaissance Technologies ✦ | 436.20K | New | $11.51M | 0.0% | New | 1 | SEC ↗ |
| 33 | Alyeska Investment Group, L.P. | 400.00K | n/a | $10.55M | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Man Group plc | 387.11K | n/a | $10.21M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 35 | Ameriprise Financial Inc | 373.49K | n/a | $9.85M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 36 | Allspring Global Investments… | 356.03K | n/a | $9.58M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 37 | Squarepoint Ops LLC | 353.99K | n/a | $9.34M | 0.0% | n/c | 1 | SEC ↗ |
| 38 | UBS AM, a distinct business unit of… | 330.71K | n/a | $8.72M | 0.0% | n/c | 1 | SEC ↗ ×9 |
| 39 | AQR Capital Management ✦ | 327.97K | +31.0% | $8.65M | 0.0% | ▲ Add | 4 | SEC ↗ ×5 |
| 40 | Two Sigma Investments ✦ | 310.93K | +92.7% | $8.20M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 41 | Rhumbline Advisers | 300.21K | n/a | $7.92M | 0.0% | n/c | 1 | SEC ↗ |
| 42 | UBS Group AG | 274.30K | n/a | $7.24M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 43 | Swiss National Bank | 255.40K | n/a | $6.74M | 0.0% | n/c | 1 | SEC ↗ |
| 44 | Nuveen, LLC | 241.93K | n/a | $6.38M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 45 | Bnp Paribas Financial Markets | 198.78K | n/a | $5.24M | 0.0% | n/c | 1 | SEC ↗ |
| 46 | Legal & General Group Plc | 185.65K | n/a | $4.90M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 47 | Jane Street Group, Llc | 181.18K | n/a | $4.78M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 48 | Susquehanna International Group, Llp | 134.28K | n/a | $3.54M | 0.0% | n/c | 1 | SEC ↗ |
| 49 | California State Teachers… | 123.00K | n/a | $3.24M | 0.0% | n/c | 1 | SEC ↗ |
| 50 | Neuberger Berman Group LLC | 119.74K | n/a | $3.16M | 0.0% | n/c | 1 | SEC ↗ |
| 51 | Citigroup Inc | 106.30K | n/a | $2.80M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 52 | T. Rowe Price ✦ | 101.37K | +4.9% | $2.67M | 0.0% | ▲ Add | 7 | SEC ↗ |
| 53 | State Of Wisconsin Investment Board | 97.61K | n/a | $2.57M | 0.0% | n/c | 1 | SEC ↗ |
| 54 | Sei Investments Co | 96.91K | n/a | $2.56M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 55 | State Board Of Administration Of… | 92.80K | n/a | $2.45M | 0.0% | n/c | 1 | SEC ↗ |
| 56 | Hrt Financial Lp | 90.34K | n/a | $2.38M | 0.0% | n/c | 1 | SEC ↗ |
| 57 | Barclays Plc | 88.30K | n/a | $2.33M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 58 | MIRAE ASSET GLOBAL ETFS HOLDINGS… | 83.81K | n/a | $2.21M | 0.0% | n/c | 1 | SEC ↗ |
| 59 | Manufacturers Life Insurance… | 82.25K | n/a | $2.17M | 0.0% | n/c | 1 | SEC ↗ |
| 60 | Massachusetts Financial Services Co… | 80.16K | n/a | $2.11M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 61 | Hsbc Holdings Plc | 79.62K | n/a | $2.11M | 0.0% | n/c | 1 | SEC ↗ ×10 |
| 62 | Mitsubishi UFJ Asset Management… | 74.37K | n/a | $2.00M | 0.0% | n/c | 1 | SEC ↗ |
| 63 | Gotham Asset Management ✦ | 73.09K | -41.3% | $1.93M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 64 | Wells Fargo & Company/Mn | 65.37K | n/a | $1.72M | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 65 | Quantinno Capital Management LP | 65.35K | n/a | $1.72M | 0.0% | n/c | 1 | SEC ↗ |
| 66 | Janus Henderson Group Plc | 57.33K | n/a | $1.51M | 0.0% | n/c | 1 | SEC ↗ |
| 67 | D. E. Shaw & Co. ✦ | 55.30K | New | $1.46M | 0.0% | New | 1 | SEC ↗ |
| 68 | Peak6 Llc | 55.08K | n/a | $1.45M | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 69 | New York State Common Retirement… | 50.94K | n/a | $1.34M | 0.0% | n/c | 1 | SEC ↗ |
| 70 | Qube Research & Technologies Ltd | 48.10K | n/a | $1.27M | 0.0% | n/c | 1 | SEC ↗ |
| 71 | Zurcher Kantonalbank (Zurich… | 42.73K | n/a | $1.13M | 0.0% | n/c | 1 | SEC ↗ |
| 72 | Royal Bank Of Canada | 37.53K | n/a | $990,000 | 0.0% | n/c | 1 | SEC ↗ ×7 |
| 73 | Envestnet Asset Management Inc | 36.81K | n/a | $971,029 | 0.0% | n/c | 1 | SEC ↗ |
| 74 | LPL Financial LLC | 32.47K | n/a | $856,638 | 0.0% | n/c | 1 | SEC ↗ |
| 75 | Pacer Advisors, Inc. | 32.31K | n/a | $852,417 | 0.0% | n/c | 1 | SEC ↗ |
| 76 | Corient Private Wealth LP | 29.80K | n/a | $815,261 | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 77 | Mml Investors Services, Llc | 30.89K | n/a | $814,931 | 0.0% | n/c | 1 | SEC ↗ |
| 78 | Tudor Investment Corp Et Al | 25.66K | n/a | $677,043 | 0.0% | n/c | 1 | SEC ↗ |
| 79 | Creative Planning | 25.41K | n/a | $670,216 | 0.0% | n/c | 1 | SEC ↗ |
| 80 | Sumitomo Mitsui Trust Group, Inc. | 23.71K | n/a | $625,523 | 0.0% | n/c | 1 | SEC ↗ |
| 81 | Lazard Asset Management Llc | 23.71K | n/a | $625,523 | 0.0% | n/c | 1 | SEC ↗ |
| 82 | Amundi | 23.26K | n/a | $613,493 | 0.0% | n/c | 1 | SEC ↗ |
| 83 | Tidal Investments LLC | 23.14K | n/a | $610,301 | 0.0% | n/c | 1 | SEC ↗ |
| 84 | Russell Investments Group, Ltd. | 21.25K | n/a | $560,547 | 0.0% | n/c | 1 | SEC ↗ ×4 |
| 85 | Pictet Asset Management Holding SA | 20.79K | n/a | $548,361 | 0.0% | n/c | 1 | SEC ↗ |
| 86 | ProShare Advisors LLC | 20.77K | n/a | $547,992 | 0.0% | n/c | 1 | SEC ↗ |
| 87 | Deutsche Bank Ag\ | 20.18K | n/a | $532,401 | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 88 | Victory Capital Management Inc | 18.72K | n/a | $493,860 | 0.0% | n/c | 1 | SEC ↗ |
| 89 | Canada Pension Plan Investment Board | 18.00K | n/a | $474,840 | 0.0% | n/c | 1 | SEC ↗ |
| 90 | Parallax Volatility Advisers, L.P. | 17.29K | n/a | $456,137 | 0.0% | n/c | 1 | SEC ↗ |
| 91 | Universal- Beteiligungs- und… | 17.09K | n/a | $450,702 | 0.0% | n/c | 1 | SEC ↗ |
| 92 | Rockefeller Capital Management L.P. | 16.88K | n/a | $445,189 | 0.0% | n/c | 1 | SEC ↗ ×2 |
| 93 | Bank Of Montreal /Can/ | 14.07K | n/a | $371,299 | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 94 | Cwm, Llc | 14.05K | n/a | $371,000 | 0.0% | n/c | 1 | SEC ↗ |
| 95 | Walleye Trading LLC | 13.88K | n/a | $366,023 | 0.0% | n/c | 1 | SEC ↗ |
| 96 | Wealth Enhancement Advisory… | 11.08K | n/a | $349,390 | 0.0% | n/c | 1 | SEC ↗ |
| 97 | Holocene Advisors, LP | 12.96K | n/a | $341,938 | 0.0% | n/c | 1 | SEC ↗ |
| 98 | Mitsubishi UFJ Trust & Banking Corp | 12.75K | n/a | $336,398 | 0.0% | n/c | 1 | SEC ↗ |
| 99 | Cetera Investment Advisers | 11.90K | n/a | $313,948 | 0.0% | n/c | 1 | SEC ↗ |
| 100 | Mirae Asset Global Investments Co.… | 11.89K | n/a | $313,790 | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Norges Bank | $38.46M | 0.0% |
| Renaissance Technologies | $11.51M | 0.0% |
| D. E. Shaw & Co. | $1.46M | 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.
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
Oct 07
SC 13G/A: FMR LLC
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: Q4 2025 ·
Methodology ·
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