ALLEGRO MICROSYSTEMS INC (ALGM)
Institutional ownership reported to the SEC as of Q2 2026, across 23 quarters.
351
Reporting holders
$9.9B
Reported value
76.9%
Of shares outstanding
0.7%
Held as options
+60
Holder change
Institutions report 143,282,092 shares against 186,402,046 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| FMR LLC | $1.8B | 25,581,021 | 0.08% | 23q | -6.7%-$128.1M |
| BlackRock, Inc. | $967.0M | 13,889,324 | 0.01% | 8q | +11.2%+$97.1M |
| Invesco Ltd. | $952.3M | 13,678,393 | 0.08% | 23q | +56.3%+$343.0M |
| JPMORGAN CHASE & CO | $844.9M | 12,723,790 | 0.05% | 23q | +47.1%+$270.4M |
| Capital Research Global Investors | $835.9M | 12,006,396 | 0.12% | 8q | -3.5%-$29.9M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $533.9M | 7,668,472 | 0.02% | 2q | -3.2%-$17.5M |
| STATE STREET CORP | $395.2M | 5,676,421 | 0.01% | 23q | +8.6%+$31.2M |
| VANGUARD CAPITAL MANAGEMENT LLC | $383.5M | 5,508,806 | 0.01% | 2q | +0.8%+$3.1M |
| Clearbridge Investments, LLC | $205.1M | 2,946,239 | 0.17% | 23q | +2.9%+$5.7M |
| GEODE CAPITAL MANAGEMENT, LLC | $184.2M | 2,644,929 | 0.01% | 23q | +7.7%+$13.1M |
| DIMENSIONAL FUND ADVISORS LP | $147.8M | 2,123,963 | 0.03% | 20q | -2.1%-$3.2M |
| MORGAN STANLEY | $126.0M | 1,809,335 | 0.01% | 23q | -20.5%-$32.4M |
| LOOMIS SAYLES & CO L P | $112.8M | 1,619,931 | 0.14% | 8q | -3.2%-$3.8M |
| GOLDMAN SACHS GROUP INC | $109.7M | 1,575,057 | 0.01% | 23q | +9.6%+$9.6M |
| PRINCIPAL FINANCIAL GROUP INC | $103.7M | 1,489,791 | 0.05% | 23q | -16.8%-$20.9M |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | $100.5M | 1,443,495 | 0.03% | 14q | +1983.1%+$95.7M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $94.7M | 1,360,525 | 0.01% | 23q | -2.2%-$2.1M |
| Sixth Street Partners Management Company, L.P. | $94.7M | 1,360,525 | 0.01% | new | NEW |
| NORGES BANK | $90.2M | 1,294,958 | 0.01% | 21q | -11.2%-$11.3M |
| NORTHERN TRUST CORP | $81.3M | 1,167,135 | 0.01% | 23q | +11.6%+$8.5M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | $80.7M | 1,159,503 | 0.12% | 3q | -44.3%-$64.1M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | $78.1M | 1,121,950 | 0.11% | 23q | -23.4%-$23.9M |
| VOYA INVESTMENT MANAGEMENT LLC | $67.3M | 966,871 | 0.06% | 22q | -33.7%-$34.3M |
| RAYMOND JAMES FINANCIAL INC | $64.6M | 928,060 | 0.02% | 7q | -6.8%-$4.7M |
| BANK OF AMERICA CORP /DE/ | $64.2M | 921,728 | 0.00% | 23q | +7.7%+$4.6M |
| WELLINGTON MANAGEMENT GROUP LLP | $56.7M | 814,937 | 0.01% | 8q | +21.1%+$9.9M |
| VANGUARD FIDUCIARY TRUST CO | $55.7M | 800,030 | 0.01% | 2q | +4.5%+$2.4M |
| UBS Group AG | $54.4M | 780,945 | 0.01% | 23q | +79.4%+$24.1M |
| Nuveen, LLC | $50.3M | 722,645 | 0.01% | 6q | -23.7%-$15.7M |
| Bank of New York Mellon Corp | $49.9M | 716,952 | 0.01% | 23q | -3.5%-$1.8M |
| KENNEDY CAPITAL MANAGEMENT LLC | $48.0M | 689,668 | 0.85% | 18q | -24.2%-$15.3M |
| FIRST TRUST ADVISORS LP | $47.6M | 684,022 | 0.03% | 20q | +64.9%+$18.7M |
| AMERIPRISE FINANCIAL INC | $43.0M | 608,793 | 0.01% | 23q | -15.3%-$7.7M |
| Allspring Global Investments Holdings, LLC | $39.2M | 620,540 | 0.06% | 19q | +101.7%+$19.8M |
| ALLIANCEBERNSTEIN L.P. | $37.9M | 1,201,203 | 0.01% | 23q | -30.3%-$16.5M |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | $37.4M | 537,082 | 0.25% | 18q | -24.1%-$11.9M |
| AQR CAPITAL MANAGEMENT LLC | $33.4M | 493,753 | 0.01% | 6q | +43.1%+$10.1M |
| Aperture Investors, LLC | $30.9M | 443,427 | 2.79% | 2q | -37.5%-$18.5M |
| BRAUN STACEY ASSOCIATES INC | $25.5M | 366,493 | 0.72% | new | NEW |
| TWO SIGMA INVESTMENTS, LP | $24.2M | 343,994 | 0.02% | 14q | -46.2%-$20.8M |
| RHUMBLINE ADVISERS | $23.2M | 333,507 | 0.02% | 23q | +8.1%+$1.7M |
| S SQUARED TECHNOLOGY, LLC | $23.1M | 332,451 | 7.18% | 22q | -27.3%-$8.7M |
| SEGALL BRYANT & HAMILL, LLC | $23.1M | 332,440 | 0.27% | 6q | -68.2%-$49.6M |
| FRONTIER CAPITAL MANAGEMENT CO LLC | $23.0M | 330,904 | 0.21% | 7q | +25.3%+$4.7M |
| CIBC Bancorp USA Inc. | $22.8M | 327,536 | 0.03% | new | NEW |
| Gotham Asset Management, LLC | $22.7M | 325,436 | 0.05% | 5q | +4.2%+$918.3K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $22.5M | 323,297 | 0.00% | 22q | -6.3%-$1.5M |
| JANE STREET GROUP, LLC | $22.2M | 5,136 | 0.00% | 15q | -66.8%-$44.6M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $21.7M | 178,568 | 0.00% | 23q | +54.8%+$7.7M |
| Russell Investments Group, Ltd. | $19.0M | 272,403 | 0.02% | 16q | +183.5%+$12.3M |
| Balyasny Asset Management L.P. | $18.6M | 267,283 | 0.02% | 10q | +8.7%+$1.5M |
| Swiss National Bank | $17.5M | 250,900 | 0.01% | 21q | -2.1%-$382.9K |
| FEDERATED HERMES, INC. | $16.5M | 237,367 | 0.02% | 23q | +2305.4%+$15.8M |
| Pier Capital, LLC | $15.9M | 227,777 | 2.10% | 8q | +0.5%+$84.3K |
| Granite Investment Partners, LLC | $15.0M | 215,679 | 0.77% | new | NEW |
| Lightrock Netherlands B.V. | $14.4M | 206,490 | 2.84% | 3q | -59.4%-$21.0M |
| PEREGRINE CAPITAL MANAGEMENT LLC | $14.0M | 200,422 | 0.45% | 6q | -22.8%-$4.1M |
| CITADEL ADVISORS LLC | $13.7M | options only | 0.00% | 22q | OPTIONS |
| Granahan Investment Management, LLC | $12.9M | 185,461 | 0.46% | 3q | -13.7%-$2.1M |
| Talos Eurisko Asset Management LP | $12.7M | 182,600 | 1.81% | 3q | -63.0%-$21.6M |
| SEI INVESTMENTS CO | $11.8M | 169,643 | 0.01% | 23q | -22.5%-$3.4M |
| Retirement Systems of Alabama | $11.8M | 169,402 | 0.04% | 15q | -12.3%-$1.7M |
| Quantinno Capital Management LP | $11.6M | 166,217 | 0.01% | 13q | +24.1%+$2.2M |
| Legal & General Group Plc | $11.5M | 164,734 | 0.00% | 23q | HELD |
| CITIGROUP INC | $10.3M | 148,210 | 0.00% | 3q | +39.6%+$2.9M |
| Nippon Life Global Investors Americas, Inc. | $10.0M | 143,870 | 0.40% | new | NEW |
| TRILLIUM ASSET MANAGEMENT, LLC | $10.0M | 143,348 | 0.31% | 21q | +12.4%+$1.1M |
| CASTLEARK MANAGEMENT LLC | $9.9M | 141,900 | 0.27% | 2q | -3.7%-$384.3K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $9.3M | 133,903 | 0.01% | 8q | +5.1%+$453.2K |
| PEAK6 LLC | $8.4M | options only | 0.02% | 5q | OPTIONS |
| VANGUARD ASSET MANAGEMENT, Ltd | $8.3M | 119,149 | 0.01% | 2q | +2.7%+$214.4K |
| ROYAL BANK OF CANADA | $7.6M | 108,497 | 0.00% | 23q | +257.6%+$5.4M |
| Lisanti Capital Growth, LLC | $7.5M | 107,865 | 1.65% | new | NEW |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | $6.7M | 96,177 | 0.01% | 18q | +3.6%+$235.3K |
| Man Group plc | $6.6M | 95,101 | 0.01% | 4q | -69.0%-$14.7M |
| WELLS FARGO & COMPANY/MN | $6.6M | 94,917 | 0.00% | 23q | -35.4%-$3.6M |
| Edgestream Partners, L.P. | $6.4M | 92,188 | 0.19% | new | NEW |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | $6.4M | 91,616 | 0.00% | 15q | +13.0%+$734.1K |
| NEW YORK STATE COMMON RETIREMENT FUND | $6.2M | 89,119 | 0.01% | 23q | +92.3%+$3.0M |
| DEUTSCHE BANK AG\ | $6.2M | 88,759 | 0.00% | 23q | +268.0%+$4.5M |
| STATE OF WISCONSIN INVESTMENT BOARD | $6.1M | 88,089 | 0.01% | 18q | -7.2%-$477.9K |
| ENVESTNET ASSET MANAGEMENT INC | $6.0M | 85,884 | 0.00% | 23q | +91.1%+$2.9M |
| Candriam S.C.A. | $5.9M | 84,708 | 0.03% | 4q | -1.6%-$94.9K |
| ArrowMark Colorado Holdings LLC | $5.8M | 83,361 | 0.24% | 23q | -31.0%-$2.6M |
| IMC-Chicago, LLC | $5.0M | 17,227 | 0.00% | 10q | HELD |
| LPL Financial LLC | $5.0M | 71,589 | 0.00% | 14q | +98.4%+$2.5M |
| VAN ECK ASSOCIATES CORP | $4.9M | 70,504 | 0.00% | 8q | +68.8%+$2.0M |
| ALGERT GLOBAL LLC | $4.5M | 65,240 | 0.05% | 2q | +384.0%+$3.6M |
| MetLife Investment Management, LLC | $4.5M | 64,638 | 0.02% | 18q | +5.9%+$249.7K |
| Holocene Advisors, LP | $4.4M | 63,010 | 0.01% | new | NEW |
| State of Tennessee, Department of Treasury | $4.3M | 62,389 | 0.01% | 15q | -21.3%-$1.2M |
| Zurcher Kantonalbank (Zurich Cantonalbank) | $4.3M | 61,148 | 0.01% | 21q | +25.8%+$873.3K |
| Informed Momentum Co LLC | $4.1M | 59,485 | 0.37% | new | NEW |
| GUGGENHEIM CAPITAL LLC | $4.1M | 59,349 | 0.03% | 13q | +10.5%+$394.0K |
| NEUBERGER BERMAN GROUP LLC | $4.1M | 59,204 | 0.00% | 6q | +2.1%+$85.4K |
| Jupiter Topco LLC | $4.0M | 57,329 | 0.00% | new | FIRST |
| Police & Firemen's Retirement System of New Jersey | $3.9M | 56,462 | 0.03% | 7q | +5.9%+$218.6K |
| NEEDHAM INVESTMENT MANAGEMENT LLC | $3.8M | 55,000 | 0.12% | 11q | HELD |
| JONES FINANCIAL COMPANIES LLLP | $3.8M | 64,921 | 0.00% | 8q | +62.5%+$1.4M |
| Louisiana State Employees Retirement System | $3.7M | 72,300 | 0.03% | 15q | +100.8%+$1.8M |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-13 | 13G | Invesco Ltd. | 7.3% |
| 2026-08-06 | 13G/A | FMR LLCwith 1 co-filers | 13.7% |
| 2026-07-27 | 13G/A | BlackRock, Inc. | 6.9% |
| 2026-07-16 | 13G | JPMORGAN CHASE & CO | 6.8% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 351 | $9.9B | 143,282,092 | 96 | 102 | 102 | 0.7% |
| Q1 2026 | 291 | $4.3B | 136,163,394 | 55 | 106 | 77 | 0.2% |
| Q4 2025 | 274 | $3.6B | 135,017,487 | 46 | 72 | 106 | 1.2% |
| Q3 2025 | 272 | $4.3B | 141,189,175 | 56 | 69 | 95 | 4.0% |
| Q2 2025 | 255 | $5.2B | 143,884,356 | 48 | 81 | 94 | 5.7% |
| Q1 2025 | 269 | $4.0B | 154,062,451 | 61 | 92 | 72 | 2.9% |
| Q4 2024 | 241 | $3.0B | 137,127,431 | 32 | 66 | 100 | 1.5% |
| Q3 2024 | 232 | $3.6B | 149,456,697 | 35 | 105 | 62 | 2.2% |
| Q2 2024 | 253 | $3.2B | 111,868,627 | 35 | 96 | 78 | 1.6% |
| Q1 2024 | 250 | $3.2B | 111,472,257 | 41 | 93 | 81 | 4.7% |
| Q4 2023 | 257 | $3.1B | 97,817,638 | 38 | 84 | 86 | 4.8% |
| Q3 2023 | 267 | $3.0B | 94,389,922 | 33 | 118 | 79 | 3.5% |
| Q2 2023 | 295 | $4.3B | 92,389,290 | 67 | 110 | 75 | 2.9% |
| Q1 2023 | 257 | $4.8B | 98,941,433 | 96 | 69 | 65 | 1.9% |
| Q4 2022 | 174 | $2.7B | 87,764,309 | 54 | 59 | 43 | 0.9% |
| Q3 2022 | 173 | $2.0B | 90,406,538 | 25 | 75 | 49 | 0.5% |
| Q2 2022 | 172 | $1.9B | 88,498,858 | 31 | 78 | 40 | 1.0% |
| Q1 2022 | 173 | $2.6B | 89,247,288 | 39 | 59 | 48 | 1.3% |
| Q4 2021 | 167 | $3.2B | 88,042,632 | 34 | 62 | 45 | 0.2% |
| Q3 2021 | 153 | $2.7B | 84,677,040 | 37 | 52 | 48 | 0.1% |
| Q2 2021 | 127 | $2.2B | 80,009,904 | 33 | 51 | 33 | 0.0% |
| Q1 2021 | 123 | $2.0B | 77,963,458 | 45 | 53 | 24 | 0.1% |
| Q4 2020 | 92 | $823.5M | 30,887,955 | 89 | 0 | 0 | 0.0% |