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
317
Shares (Excl. Options)
138,333,933
Price
$31.53
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- Security type / class
- Equity / COMMON STOCK
- Symbol
- ALGM on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 138,333,933
- Total 13F value
- $4,322,844,357
- Portfolio coverage rank
- 0%
- Share change
- +1,860,802
- Value change
- +$80,391,049
- Number of holders
- 317
- Shares outstanding
- 185,278,416
- SEC-reported price per share
- $50.76
- Insider filing price
- $50.76
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ALGM - ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK is tracked under CUSIP 01749D105.
- 317 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 294 to 317 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $3,603,604,368 to $4,322,844,357.
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 317 institutions filings for Q1 2026.
Security key
01749D105
Latest holder period
Q1 2026
13F holders
317
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:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
ALGM
| 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, 317 institutional investors reported holding 138,333,933 shares of ALLEGRO MICROSYSTEMS, INC. - COMMON STOCK (ALGM). This represents 75% of the company’s total 185,278,416 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
63%
| 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 |
| NORTHERN TRUST CORP | 0.56% | 1,045,541 | +3% | 0% | $32,965,909 |
| SEGALL BRYANT & HAMILL, LLC | 0.56% | 1,044,984 | -16% | 0.47% | $32,948,346 |
| 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 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
22
Latest
Q1 2026
Rows shown
1-22 of 22
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 138,333,933 | $4,322,844,357 | +$80,391,049 | $31.53 | 317 |
| 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 |