ALLEGRO MICROSYSTEMS, INC. ALGM
CIK 0000866291 · CUSIP 01749D105
Quarter-end disclosures, not live holdings.
Top 20 institutions
Weight means this stock's share of the manager's own portfolio.
| # | Manager | Value | Manager weight | Change vs prior | Source | |
|---|---|---|---|---|---|---|
| 01 | FMR LLC CIK 315066 · View history | $864.59M 27,421,206 shares | 0.05% | +3.79M(+16.00%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 02 | BlackRock, Inc. CIK 2012383 · View history | $393.96M 12,494,868 shares | 0.01% | +293.41K(+2.40%)Added | SEC filing ↗ May 13, 2026 | ▾ |
| 03 | Capital Research Global Investors CIK 1422848 · View history | $392.09M 12,435,558 shares | 0.06% | -675.73K(-5.20%)Reduced | SEC filing ↗ May 13, 2026 | ▾ |
| 04 | Invesco Ltd. CIK 914208 · Amended · View history | $275.93M 8,751,481 shares | 0.03% | +1.10M(+14.40%)Added | SEC filing ↗ May 12, 2026 | ▾ |
| 05 | VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history | $249.72M 7,920,042 shares | 0.01% | — | SEC filing ↗ May 8, 2026 | ▾ |
| 06 | JPMORGAN CHASE & CO CIK 19617 · Amended · View history | $242.60M 8,652,068 shares | 0.02% | +1.30M(+17.80%)Added | SEC filing ↗ May 13, 2026 | ▾ |
| 07 | VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history | $172.30M 5,464,718 shares | 0.00% | — | SEC filing ↗ May 15, 2026 | ▾ |
| 08 | STATE STREET CORP CIK 93751 · View history | $164.84M 5,228,104 shares | 0.01% | -131.38K(-2.50%)Reduced | SEC filing ↗ May 15, 2026 | ▾ |
| 09 | Clearbridge Investments, LLC CIK 1348883 · View history | $90.29M 2,863,710 shares | 0.08% | -53.08K(-1.80%)Reduced | SEC filing ↗ May 13, 2026 | ▾ |
| 10 | GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history | $77.48M 2,456,820 shares | 0.00% | +62.85K(+2.60%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 11 | MORGAN STANLEY CIK 895421 · View history | $71.74M 2,275,285 shares | 0.00% | +42.15K(+1.90%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 12 | DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history | $68.40M 2,170,487 shares | 0.01% | +30.34K(+1.40%)Added | SEC filing ↗ May 7, 2026 | ▾ |
| 13 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. CIK 921739 · View history | $65.60M 2,080,641 shares | 0.11% | +44.43K(+2.20%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 14 | PRINCIPAL FINANCIAL GROUP INC CIK 1126328 · View history | $56.45M 1,790,466 shares | 0.03% | +48.17K(+2.80%)Added | SEC filing ↗ May 4, 2026 | ▾ |
| 15 | LOOMIS SAYLES & CO L P CIK 312348 · View history | $52.78M 1,674,108 shares | 0.07% | +844.87K(+101.90%)Added | SEC filing ↗ May 14, 2026 | ▾ |
| 16 | ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 1165408 · View history | $46.18M 1,464,737 shares | 0.07% | -1.34M(-47.80%)Reduced | SEC filing ↗ May 15, 2026 | ▾ |
| 17 | VOYA INVESTMENT MANAGEMENT LLC CIK 1068837 · View history | $46.01M 1,459,271 shares | 0.05% | +518.91K(+55.20%)Added | SEC filing ↗ May 12, 2026 | ▾ |
| 18 | ALLIANCEBERNSTEIN L.P. CIK 1109448 · View history | $45.46M 1,723,370 shares | 0.01% | +574.72K(+50.00%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 19 | GOLDMAN SACHS GROUP INC CIK 886982 · View history | $45.32M 1,437,215 shares | 0.01% | +640.89K(+80.50%)Added | SEC filing ↗ May 15, 2026 | ▾ |
| 20 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history | $43.85M 1,390,606 shares | 0.01% | +28.19K(+2.10%)Added | SEC filing ↗ May 15, 2026 | ▾ |
Showing 20 / 322 institutions. The complete set is available through the API.
Coverage & totals by quarter
Reporting institutions by quarter
Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.
Explore all 322 reporting institutions.
This page includes 20 of 322 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.
- Download CSV
- Earlier quarters
- Advanced screening & filtering
- API & AI access
＋ New accounts get free API credits to explore data beyond ownership filings.
For AI agents & developers
The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 322 reporting institutions; totals use the complete disclosed data.
Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.
MCP https://api.akkrudata.ai/mcp
akkru_institutional_holdings
{"action":"holders","cusip":"01749D105","quarter":"2026Q1","type":"positions","page_size":100}Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.
- MCP endpoint
- https://api.akkrudata.ai/mcp
- API / MCP / CLI documentation
- /documents
- llms.txt
- /llms.txt
Sources, coverage & how to read this data
Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.