Latest Period
Q1 2026
Security Snapshot
ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK (ALGM) Institutional Ownership
CUSIP: 01749D105
13F Institutional Holders and Ownership History from Q4 2020 to Q1 2026
Institutions Reporting
315
Shares (Excl. Options)
138,315,131
Price
$31.53
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Type / Class
- Equity / COMMON STOCK
- Symbol
- ALGM on Nasdaq
- Shares outstanding
- 185,278,416
- Price per share
- $44.07
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 138,315,131
- Total reported value
- $4,323,855,016
- % of total 13F portfolios
- 0%
- Share change
- +1,844,401
- Value change
- +$79,734,684
- Number of holders
- 315
- Price from insider filings
- $44.07
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Key facts
- ALGM - ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK is tracked under CUSIP 01749D105.
- 315 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 294 to 315 between Q4 2025 and Q1 2026.
- Reported value moved from $3,603,604,368 to $4,323,855,016.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 315 institutions filings for Q1 2026.
Security key
01749D105
Latest holder period
Q1 2026
13F holders
315
13D/G owners
3
CIK / CUSIP context first
Open Q1 2026 holders
ALGM full holder history
ALLEGRO MICROSYSTEMS, INC. SEC filings
ALLEGRO MICROSYSTEMS, INC. company facts
ALLEGRO MICROSYSTEMS, INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 01749D105:
Significant Owners of ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK (ALGM) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 15% | +15% | $1,043,102,661 | +$143,998,860 | 27,421,206 | +16% | FMR LLC | 31 Mar 2026 |
| 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 Mar 2026, 315 institutional investors reported holding 138,315,131 shares of ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK (ALGM). This represents 75% of the company’s total 185,278,416 outstanding shares.
Top 25 Institutional Shareholders
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% | 27,421,206 | +16% | 0.05% | $864,590,613 |
| BlackRock, Inc. | 6.7% | 12,494,868 | +2.4% | 0.01% | $393,963,174 |
| Capital Research Global Investors | 6.7% | 12,435,558 | -5.2% | 0.06% | $392,093,144 |
| Invesco Ltd. | 4.7% | 8,751,481 | +14% | 0.04% | $275,934,196 |
| JPMORGAN CHASE & CO | 4.7% | 8,652,068 | +18% | 0.02% | $242,604,037 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4.3% | 7,920,042 | 0% | 0.01% | $249,718,924 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.9% | 5,464,718 | 0% | 0% | $172,302,559 |
| STATE STREET CORP | 2.8% | 5,228,104 | -2.5% | 0.01% | $164,842,119 |
| Clearbridge Investments, LLC | 1.5% | 2,863,710 | -1.8% | 0.08% | $90,292,781 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.3% | 2,456,820 | +2.6% | 0% | $77,480,560 |
| MORGAN STANLEY | 1.2% | 2,275,285 | +1.9% | 0% | $71,739,824 |
| DIMENSIONAL FUND ADVISORS LP | 1.2% | 2,170,487 | +1.4% | 0.01% | $68,398,874 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 1.1% | 2,080,641 | +2.2% | 0.11% | $65,603,000 |
| PRINCIPAL FINANCIAL GROUP INC | 0.97% | 1,790,466 | +2.8% | 0.03% | $56,453,393 |
| ALLIANCEBERNSTEIN L.P. | 0.93% | 1,723,370 | +50% | 0.02% | $45,462,501 |
| LOOMIS SAYLES & CO L P | 0.9% | 1,674,108 | +102% | 0.07% | $52,784,625 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 0.79% | 1,464,737 | -48% | 0.07% | $46,183,158 |
| VOYA INVESTMENT MANAGEMENT LLC | 0.79% | 1,459,271 | +55% | 0.05% | $46,010,815 |
| GOLDMAN SACHS GROUP INC | 0.78% | 1,437,215 | +80% | 0.01% | $45,315,389 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.75% | 1,390,606 | +2.1% | 0.01% | $43,845,807 |
| SEGALL BRYANT & HAMILL, LLC | 0.57% | 1,048,340 | -16% | 0.56% | $34,658,121 |
| NORTHERN TRUST CORP | 0.56% | 1,045,541 | +3% | 0% | $32,965,909 |
| RAYMOND JAMES FINANCIAL INC | 0.54% | 995,753 | +9.6% | 0.01% | $31,396,089 |
| Nuveen, LLC | 0.51% | 947,502 | +292% | 0.01% | $29,874,739 |
| KENNEDY CAPITAL MANAGEMENT LLC | 0.49% | 910,039 | +1929% | 0.61% | $28,693,530 |
Institutional Holders of ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK (ALGM) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 138,315,131 | $4,323,855,016 | +$79,734,684 | $31.53 | 315 |
| 2025 Q4 | 136,544,024 | $3,603,604,368 | -$37,898,347 | $26.38 | 294 |
| 2025 Q3 | 135,898,311 | $3,967,944,504 | -$317,495,658 | $29.20 | 292 |
| 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 |