| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 15% | +18% | $517,693,066 | +$79,739,599 | 26,921,116 | +18% | FMR LLC | 31 Mar 2025 |
| Capital Research Global Investors | 8.6% | +43% | $584,644,163 | +$177,975,599 | 15,904,357 | +44% | Capital Research Global Investors | 30 Jun 2025 |
| JPMORGAN CHASE & CO | 4.8% | $172,976,792 | 8,995,153 | JPMORGAN CHASE & CO. | 31 Mar 2025 |
As of 30 Sep 2025, 288 institutional investors reported holding 135,898,054 shares of ALLEGRO MICROSYSTEMS, INC. - Common Stock (ALGM). This represents 73% of the company’s total 184,934,384 outstanding shares.
The largest institutional shareholders of ALLEGRO MICROSYSTEMS, INC. - Common Stock (ALGM) together control 63% 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 | 15% | 27,467,843 | +0.81% | 0.04% | $802,060,992 |
| Capital Research Global Investors | 9.1% | 16,824,722 | +5.8% | 0.09% | $491,281,882 |
| VANGUARD GROUP INC | 7.7% | 14,293,465 | +0.62% | 0.01% | $417,369,179 |
| BlackRock, Inc. | 6.2% | 11,377,418 | -3.5% | 0.01% | $332,220,613 |
| JPMORGAN CHASE & CO | 4.2% | 7,731,267 | -3.5% | 0.01% | $225,753,000 |
| Invesco Ltd. | 2.9% | 5,312,427 | -15% | 0.02% | $155,122,868 |
| STATE STREET CORP | 2.9% | 5,281,285 | +1.7% | 0.01% | $154,213,522 |
| Clearbridge Investments, LLC | 1.6% | 2,932,806 | -7.3% | 0.06% | $85,637,927 |
| ALLIANCEBERNSTEIN L.P. | 1.5% | 2,690,496 | -2.5% | 0.02% | $78,562,483 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.3% | 2,369,129 | -1.5% | 0% | $69,190,805 |
| MACQUARIE GROUP LTD | 1.2% | 2,197,274 | -15% | 0.07% | $64,160,000 |
| DIMENSIONAL FUND ADVISORS LP | 1.1% | 1,970,550 | -6.5% | 0.01% | $57,539,641 |
| MORGAN STANLEY | 1% | 1,939,029 | -6.6% | 0% | $56,619,686 |
| PRINCIPAL FINANCIAL GROUP INC | 1% | 1,914,074 | -11% | 0.03% | $55,890,961 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 0.85% | 1,576,627 | -28% | 0.07% | $46,037,508 |
| SEGALL BRYANT & HAMILL, LLC | 0.72% | 1,323,726 | -0.34% | 0.51% | $38,652,799 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.7% | 1,294,993 | +4.5% | 0.01% | $37,813,796 |
| Analog Century Management LP | 0.64% | 1,174,953 | -14% | 1.8% | $34,308,628 |
| WELLINGTON MANAGEMENT GROUP LLP | 0.63% | 1,160,917 | -56% | 0.01% | $33,898,777 |
| T. Rowe Price Investment Management, Inc. | 0.59% | 1,085,198 | -16% | 0.02% | $31,688,000 |
| NORTHERN TRUST CORP | 0.55% | 1,010,857 | -4.5% | 0% | $29,517,024 |
| Point72 Asset Management, L.P. | 0.53% | 986,800 | +235% | 0.06% | $28,814,560 |
| BANK OF AMERICA CORP /DE/ | 0.52% | 952,679 | +108% | 0% | $27,818,225 |
| Voya Investment Management LLC | 0.51% | 942,076 | +31% | 0.03% | $27,508,619 |
| RAYMOND JAMES FINANCIAL INC | 0.5% | 926,358 | -26% | 0.01% | $27,049,653 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 783,062 | $21,162,069 | +$524,036 | $26.38 | 24 |
| 2025 Q3 | 135,898,054 | $3,967,936,999 | -$319,341,547 | $29.20 | 288 |
| 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 |