| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 13% | -12% | $623,510,987 | -$86,668,061 | 23,635,746 | -12% | FMR LLC | 31 Dec 2025 |
| Capital Research Global Investors | 7.1% | -17% | $410,252,327 | -$87,395,004 | 13,111,292 | -18% | Capital Research Global Investors | 31 Dec 2025 |
| JPMORGAN CHASE & CO | 4.8% | $172,976,792 | 8,995,153 | JPMORGAN CHASE & CO. | 31 Mar 2025 |
As of 31 Dec 2025, 222 institutional investors reported holding 83,740,736 shares of ALLEGRO MICROSYSTEMS, INC. - Common Stock (ALGM). This represents 45% of the company’s total 184,666,085 outstanding shares.
The largest institutional shareholders of ALLEGRO MICROSYSTEMS, INC. - Common Stock (ALGM) together control 59% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| FMR LLC | 13% | 23,635,746 | -14% | 0.03% | $623,510,987 |
| VANGUARD GROUP INC | 7.7% | 14,202,528 | -0.64% | 0.01% | $374,662,689 |
| Capital Research Global Investors | 7.1% | 13,111,292 | -22% | 0.06% | $345,875,883 |
| BlackRock, Inc. | 6.6% | 12,201,457 | +7.2% | 0.01% | $321,874,446 |
| JPMORGAN CHASE & CO | 4% | 7,347,422 | -5% | 0.01% | $193,825,019 |
| STATE STREET CORP | 2.9% | 5,359,488 | +1.5% | 0% | $141,383,293 |
| Clearbridge Investments, LLC | 1.6% | 2,916,785 | -0.55% | 0.06% | $76,944,799 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.5% | 2,803,944 | +78% | 0.11% | $73,968,043 |
| CITADEL ADVISORS LLC | 1.4% | 2,560,520 | +672% | 0.05% | $67,546,518 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.3% | 2,393,968 | +1% | 0% | $63,165,468 |
| MORGAN STANLEY | 1.2% | 2,233,136 | +15% | 0% | $58,910,171 |
| DIMENSIONAL FUND ADVISORS LP | 1.2% | 2,140,147 | +8.6% | 0.01% | $56,461,794 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.1% | 2,036,212 | 0% | 0.08% | $53,715,000 |
| Analog Century Management LP | 1% | 1,890,072 | +61% | 2.5% | $49,860,099 |
| PRINCIPAL FINANCIAL GROUP INC | 0.94% | 1,742,296 | -9% | 0.02% | $45,961,768 |
| NORGES BANK | 0.79% | 1,457,805 | 0% | $38,456,896 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.74% | 1,362,418 | +5.2% | 0.01% | $35,940,587 |
| MILLENNIUM MANAGEMENT LLC | 0.73% | 1,341,739 | +67% | 0.03% | $35,395,075 |
| SEGALL BRYANT & HAMILL, LLC | 0.68% | 1,248,310 | -5.7% | 0.45% | $32,930,418 |
| ALLIANCEBERNSTEIN L.P. | 0.62% | 1,148,652 | -57% | 0.01% | $30,301,440 |
| Point72 Asset Management, L.P. | 0.61% | 1,119,265 | +13% | 0.05% | $29,526,211 |
| WELLINGTON MANAGEMENT GROUP LLP | 0.6% | 1,106,337 | -4.7% | 0.01% | $29,185,170 |
| NORTHERN TRUST CORP | 0.55% | 1,014,999 | +0.41% | 0% | $26,775,673 |
| VOYA INVESTMENT MANAGEMENT LLC | 0.51% | 940,358 | -0.18% | 0.02% | $24,806,644 |
| LOOMIS SAYLES & CO L P | 0.45% | 829,239 | +3.4% | 0.03% | $21,875,325 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 83,740,736 | $2,209,786,713 | -$43,338,480 | $26.38 | 222 |
| 2025 Q3 | 135,898,162 | $3,967,940,153 | -$317,494,344 | $29.20 | 290 |
| 2025 Q2 | 146,056,579 | $4,992,929,892 | -$219,199,122 | $34.19 | 270 |
| 2025 Q1 | 156,311,335 | $3,927,728,563 | +$388,307,479 | $25.13 | 288 |
| 2024 Q4 | 142,070,976 | $3,106,108,365 | -$93,131,573 | $21.86 | 252 |
| 2024 Q3 | 142,653,950 | $3,322,662,692 | +$662,040,174 | $23.30 | 243 |
| 2024 Q2 | 107,229,247 | $3,029,954,806 | +$94,075,184 | $28.24 | 266 |
| 2024 Q1 | 103,930,579 | $2,801,496,390 | +$196,028,499 | $26.96 | 272 |
| 2023 Q4 | 96,322,663 | $2,913,583,833 | +$74,962,541 | $30.27 | 286 |
| 2023 Q3 | 80,834,492 | $2,581,507,429 | -$9,857,061 | $31.94 | 305 |
| 2023 Q2 | 97,600,191 | $4,405,747,760 | +$855,781 | $45.14 | 347 |
| 2023 Q1 | 97,246,444 | $4,665,848,181 | +$97,194,449 | $47.99 | 306 |
| 2022 Q4 | 96,526,699 | $2,897,890,986 | +$193,662,088 | $30.02 | 217 |
| 2022 Q3 | 90,508,830 | $1,977,725,120 | +$37,072,148 | $21.85 | 168 |
| 2022 Q2 | 88,493,474 | $1,831,183,026 | -$24,643,454 | $20.69 | 161 |
| 2022 Q1 | 89,244,064 | $2,536,743,300 | +$71,940,131 | $28.40 | 168 |
| 2021 Q4 | 87,969,961 | $3,182,089,446 | -$39,880,903 | $36.18 | 162 |
| 2021 Q3 | 84,674,887 | $2,706,520,358 | +$151,110,004 | $31.96 | 149 |
| 2021 Q2 | 80,009,678 | $2,216,241,164 | +$115,088,327 | $27.70 | 124 |
| 2021 Q1 | 77,963,176 | $1,976,368,423 | +$421,333,763 | $25.35 | 120 |
| 2020 Q4 | 29,935,709 | $798,095,898 | +$794,627,864 | $26.66 | 91 |