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ALGM

Allegro Microsystems, Inc.
$55.49 -7.72 (-12.21%) At close · Jul 2
Market Cap
$10.33B
Shares
186,222,406

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 319
Total Value: $4,120,397,884
Total Shares: 130,681,486
Showing 1–100 of 330 holdings by value · page 1 of 4

Institutional Ownership Trend

23 quarters

Superinvestors Holding ALGM

All superinvestors →
Joel Greenblatt $9,845,116 Ray Dalio $524,816

Holder Concentration

Across 319 13F filers
Top Holder
21.0%
Jun 2023 → Mar 2026 · range 12.5% – 21.0%
of institutional value
Top 5
53.4%
Jun 2023 → Mar 2026 · range 39.0% – 55.7%
of institutional value
Top 10
67.4%
Jun 2023 → Mar 2026 · range 55.1% – 69.0%
of institutional value
HHI
779
Jun 2023 → Mar 2026 · range 466 – 796
Broadly held
Showing 100 of 330
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mega FMR LLC $864,590,623 20.98% 27,421,206
Mega BlackRock, Inc. $393,963,182 9.56% 12,494,868
Mega Capital Research Global Investors $392,093,143 9.52% 12,435,558
Mega Invesco Ltd. $275,934,191 6.70% 8,751,481
Mega JPMORGAN CHASE & CO $272,799,699 6.62% 8,652,068
Mega VANGUARD CAPITAL MANAGEMENT LLC $172,302,558 4.18% 5,464,718
Mega STATE STREET CORP $164,842,119 4.00% 5,228,104
Mega Clearbridge Investments, LLC $90,292,776 2.19% 2,863,710
Mega GEODE CAPITAL MANAGEMENT, LLC $77,463,534 1.88% 2,456,820
Mega MORGAN STANLEY $71,739,727 1.74% 2,275,285
Mega DIMENSIONAL FUND ADVISORS LP $68,435,454 1.66% 2,170,487
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. $65,602,610 1.59% 2,080,641
Mega PRINCIPAL FINANCIAL GROUP INC $56,453,392 1.37% 1,790,466
Mega ALLIANCEBERNSTEIN L.P. $54,337,856 1.32% 1,723,370
Large LOOMIS SAYLES & CO L P $52,784,624 1.28% 1,674,108
Large ADAGE CAPITAL PARTNERS GP, L.L.C. $46,183,157 1.12% 1,464,737
Large VOYA INVESTMENT MANAGEMENT LLC $46,010,813 1.12% 1,459,271
Mega GOLDMAN SACHS GROUP INC $45,315,386 1.10% 1,437,215
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $43,845,807 1.06% 1,390,606
Mega NORTHERN TRUST CORP Bank $32,965,905 0.80% 1,045,541
Mid SEGALL BRYANT & HAMILL, LLC $32,948,345 0.80% 1,044,984
Mega RAYMOND JAMES FINANCIAL INC $31,396,090 0.76% 995,753
Mega Nuveen, LLC $29,874,736 0.73% 947,502
Mid KENNEDY CAPITAL MANAGEMENT LLC $28,693,529 0.70% 910,039
Mega BANK OF AMERICA CORP /DE/ Bank $26,972,430 0.65% 855,453
Mega VANGUARD FIDUCIARY TRUST CO Bank $24,148,385 0.59% 765,886
Mega Bank of New York Mellon Corp Bank $23,435,991 0.57% 743,292
Large MARSHALL WACE, LLP $23,325,262 0.57% 739,780
Small Aperture Investors, LLC $22,376,021 0.54% 709,674
Large SILVERCREST ASSET MANAGEMENT GROUP LLC $22,319,803 0.54% 707,891
Mega WELLINGTON MANAGEMENT GROUP LLP $21,222,715 0.52% 673,096
Large GW&K Investment Management, LLC $20,796,430 0.50% 659,576
Mega TWO SIGMA INVESTMENTS, LP $20,174,186 0.49% 639,841
Mega T. Rowe Price Investment Management, Inc. $17,699,176 0.43% 561,344
Large LORD, ABBETT & CO. LLC $16,725,246 0.41% 530,455
Small Lightrock Netherlands B.V. $16,016,924 0.39% 507,990
Small Talos Eurisko Asset Management LP $15,549,744 0.38% 493,173
Small S SQUARED TECHNOLOGY, LLC $14,423,430 0.35% 457,451
Mega UBS Group AG $13,727,561 0.33% 435,381
Mega FIRST TRUST ADVISORS LP $13,081,702 0.32% 414,897
Mega CITADEL ADVISORS LLC $12,594,468 0.31% 399,444
Mega AMERIPRISE FINANCIAL INC $11,328,161 0.27% 359,282
Mega AQR CAPITAL MANAGEMENT LLC $10,881,819 0.26% 345,126
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $10,879,643 0.26% 345,057
Large Gotham Asset Management, LLC $9,845,116 0.24% 312,246
Mega RHUMBLINE ADVISERS $9,724,072 0.24% 308,407
Large JACOBS LEVY EQUITY MANAGEMENT, INC $9,714,456 0.24% 308,102
Large Allspring Global Investments Holdings, LLC $9,699,384 0.24% 307,624
Large Man Group plc $9,659,183 0.23% 306,349
Small SIRIOS CAPITAL MANAGEMENT L P $9,409,214 0.23% 298,421
Mid FRONTIER CAPITAL MANAGEMENT CO LLC $8,324,897 0.20% 264,031
Large HRT FINANCIAL LP $8,253,671 0.20% 261,772
Mid PEREGRINE CAPITAL MANAGEMENT LLC $8,190,358 0.20% 259,764
Mega Swiss National Bank Bank $8,084,292 0.20% 256,400
Large Balyasny Asset Management L.P. $7,753,541 0.19% 245,910
Small Pier Capital, LLC $7,143,625 0.17% 226,566
Large SEI INVESTMENTS CO $6,904,313 0.17% 218,976
Mid Granahan Investment Management, LLC $6,778,981 0.16% 215,001
Small G2 Investment Partners Management LLC $6,576,180 0.16% 208,569
Large Retirement Systems of Alabama Pension $6,091,438 0.15% 193,195
Small KETTLE HILL CAPITAL MANAGEMENT, LLC $5,723,672 0.14% 181,531
Small Roubaix Capital, LLC $5,359,879 0.13% 169,993
Mega Legal & General Group Plc $5,192,075 0.13% 164,671
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $4,724,013 0.11% 149,826
Mid CASTLEARK MANAGEMENT LLC $4,648,152 0.11% 147,420
Large Quantinno Capital Management LP $4,221,930 0.10% 133,902
Large Trexquant Investment LP $4,218,714 0.10% 133,800
Large Walleye Capital LLC $4,119,962 0.10% 130,668
Mid TRILLIUM ASSET MANAGEMENT, LLC $4,021,872 0.10% 127,557
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $4,016,701 0.10% 127,393
Large RENAISSANCE TECHNOLOGIES LLC $3,906,567 0.09% 123,900
Mega CANADA PENSION PLAN INVESTMENT BOARD Pension $3,846,660 0.09% 122,000
Mid ArrowMark Colorado Holdings LLC $3,808,319 0.09% 120,784
Mega VANGUARD ASSET MANAGEMENT, Ltd $3,659,655 0.09% 116,069
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $3,638,025 0.09% 115,383
Mega PRICE T ROWE ASSOCIATES INC /MD/ $3,588,082 0.09% 113,799
Mega CITIGROUP INC $3,347,035 0.08% 106,154
Large Russell Investments Group, Ltd. $3,029,495 0.07% 96,083
Mid Brevan Howard Capital Management LP $2,998,471 0.07% 95,099
Large STATE OF WISCONSIN INVESTMENT BOARD $2,993,868 0.07% 94,953
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Pension $2,925,889 0.07% 92,797
Large Candriam S.C.A. $2,713,881 0.07% 86,073
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $2,556,200 0.06% 81,072
Large State of Tennessee, Department of Treasury $2,498,342 0.06% 79,237
Mega WELLS FARGO & COMPANY/MN $2,316,223 0.06% 73,461
Mega Mitsubishi UFJ Asset Management Co., Ltd. $2,237,242 0.05% 70,956
Mega MASSACHUSETTS FINANCIAL SERVICES CO /MA/ $2,184,934 0.05% 69,297
Mid XTX Topco Ltd $2,161,917 0.05% 68,567
Mid Entropy Technologies, LP $2,135,180 0.05% 67,719
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $2,052,603 0.05% 65,100
Large State of New Jersey Common Pension Fund D Pension $1,955,553 0.05% 62,022
Large MetLife Investment Management, LLC $1,924,938 0.05% 61,051
Mega NEUBERGER BERMAN GROUP LLC $1,828,014 0.04% 57,977
Mega JANUS HENDERSON GROUP PLC $1,807,583 0.04% 57,329
Small Sphera Management Technology Funds Ltd $1,801,939 0.04% 57,150
Large AMALGAMATED BANK Bank $1,759,247 0.04% 55,796
Mid BW Gestao de Investimentos Ltda. $1,734,150 0.04% 55,000
Mid NEEDHAM INVESTMENT MANAGEMENT LLC $1,734,150 0.04% 55,000
Mid SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC $1,702,620 0.04% 54,000
Large GUGGENHEIM CAPITAL LLC $1,692,845 0.04% 53,690
Key facts CIK 866291 CUSIP 01749D105 13F (30d) 5 filings 5 filers Visit website Investor relations

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