ALLEGRO MICROSYSTEMS INC (ALGM) Top Institutional Shareholders
ALLEGRO MICROSYSTEMS INC (ALGM) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $4.00B in ALGM holdings during the latest filing period.
Fmr Llc is currently the largest disclosed institutional shareholder of ALGM tracked by InsiderSet, reporting ownership valued at approximately $864.59M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $1.48B, representing an estimated gain of +71.20% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 69% of the total disclosed ALGM value among the investors covered in this analysis. Major shareholders include Fmr Llc, Blackrock, Inc., Capital Research Global Investors, and several other long-term asset managers with concentrated positions in ALLEGRO MICROSYSTEMS INC (ALGM).
This page ranks the largest institutional ALGM shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
315
Total Reported Value
$4.00B
Largest Holder
Fmr Llc
Largest Position
$864.59M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
89
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Fmr Llc | 0.05% | 27,421,206 | $864,590,613 | $1,480,196,700 | +$615,606,087 | +71.20% | |
| Blackrock, Inc. | 0.01% | 12,494,868 | $393,963,174 | $674,472,975 | +$280,509,801 | +71.20% | |
| Capital Research Global Investors | 0.06% | 12,435,558 | $392,093,144 | $671,271,421 | +$279,178,277 | +71.20% | |
| Invesco Ltd. | 0.04% | 8,751,481 | $275,934,196 | $472,404,944 | +$196,470,748 | +71.20% | |
| Vanguard Portfolio Management Llc | 0.01% | 7,920,042 | $249,718,924 | $427,523,867 | +$177,804,943 | +71.20% | |
| Vanguard Capital Management Llc | 0.00% | 5,464,718 | $172,302,559 | $294,985,478 | +$122,682,919 | +71.20% | |
| State Street Corp | 0.01% | 5,228,104 | $164,842,119 | $282,213,054 | +$117,370,935 | +71.20% | |
| Clearbridge Investments, Llc | 0.08% | 2,863,710 | $90,292,781 | $154,583,066 | +$64,290,285 | +71.20% | |
| Geode Capital Management, Llc | 0.00% | 2,456,820 | $77,480,560 | $132,619,144 | +$55,138,584 | +71.16% | |
| Morgan Stanley | 0.00% | 2,275,285 | $71,739,824 | $122,819,884 | +$51,080,060 | +71.20% | |
| Dimensional Fund Advisors Lp | 0.01% | 2,170,487 | $68,398,874 | $117,162,888 | +$48,764,014 | +71.29% | |
| Nomura Asset Management International Inc. | 0.11% | 2,080,641 | $65,603,000 | $112,313,001 | +$46,710,001 | +71.20% | |
| Principal Financial Group Inc | 0.03% | 1,790,466 | $56,453,393 | $96,649,355 | +$40,195,962 | +71.20% | |
| Loomis Sayles & Co L P | 0.07% | 1,674,108 | $52,784,625 | $90,368,350 | +$37,583,725 | +71.20% | |
| Adage Capital Partners Gp, L.L.C. | 0.07% | 1,464,737 | $46,183,158 | $79,066,503 | +$32,883,345 | +71.20% | |
| Voya Investment Management Llc | 0.05% | 1,459,271 | $46,010,815 | $78,771,449 | +$32,760,634 | +71.20% | |
| Alliancebernstein L.P. | 0.01% | 1,723,370 | $45,462,501 | $93,027,513 | +$47,565,012 | +104.62% | |
| Goldman Sachs Group Inc | 0.01% | 1,437,215 | $45,315,389 | $77,580,866 | +$32,265,477 | +71.20% | |
| Charles Schwab Investment Management Inc | 0.01% | 1,390,606 | $43,845,807 | $75,064,912 | +$31,219,105 | +71.20% | |
| Segall Bryant & Hamill, Llc | 0.56% | 1,048,340 | $34,658,121 | $56,589,393 | +$21,931,272 | +63.28% | |
| Northern Trust Corp | 0.00% | 1,045,541 | $32,965,909 | $56,438,303 | +$23,472,394 | +71.20% | |
| Raymond James Financial Inc | 0.01% | 995,753 | $31,396,089 | $53,750,747 | +$22,354,658 | +71.20% | |
| Nuveen, Llc | 0.01% | 947,502 | $29,874,739 | $51,146,158 | +$21,271,419 | +71.20% | |
| Kennedy Capital Management Llc | 0.61% | 910,039 | $28,693,530 | $49,123,905 | +$20,430,375 | +71.20% | |
| Bank Of America Corp | 0.00% | 855,453 | $26,972,435 | $46,177,353 | +$19,204,918 | +71.20% | |
| Vanguard Fiduciary Trust Co | 0.01% | 765,886 | $24,148,386 | $41,342,526 | +$17,194,140 | +71.20% | |
| Bank Of New York Mellon Corp | 0.00% | 743,292 | $23,436,011 | $40,122,902 | +$16,686,891 | +71.20% | |
| Marshall Wace, Llp | 0.02% | 739,780 | $23,325,264 | $39,933,324 | +$16,608,060 | +71.20% | |
| Aperture Investors, Llc | 2.83% | 709,674 | $22,376,021 | $38,308,203 | +$15,932,182 | +71.20% | |
| Silvercrest Asset Management Group Llc | 0.16% | 707,891 | $22,319,832 | $38,211,956 | +$15,892,124 | +71.20% | |
| Wellington Management Group Llp | 0.00% | 673,096 | $21,222,716 | $36,333,722 | +$15,111,006 | +71.20% | |
| Two Sigma Investments, Lp | 0.02% | 639,841 | $20,174,187 | $34,538,617 | +$14,364,430 | +71.20% | |
| Lightrock Netherlands B.V. | 3.42% | 507,990 | $16,016,925 | $27,421,300 | +$11,404,375 | +71.20% | |
| Talos Eurisko Asset Management Lp | 2.66% | 493,173 | $15,549,745 | $26,621,479 | +$11,071,734 | +71.20% | |
| S Squared Technology, Llc | 5.46% | 457,451 | $14,423,430 | $24,693,205 | +$10,269,775 | +71.20% | |
| Ubs Group Ag | 0.00% | 435,381 | $13,727,563 | $23,501,866 | +$9,774,303 | +71.20% | |
| First Trust Advisors Lp | 0.01% | 414,897 | $13,081,702 | $22,396,140 | +$9,314,438 | +71.20% | |
| Citadel Advisors Llc | 0.01% | 399,444 | $12,594,469 | $21,561,987 | +$8,967,518 | +71.20% | |
| Ameriprise Financial Inc | 0.00% | 359,282 | $11,328,160 | $19,394,042 | +$8,065,882 | +71.20% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 345,057 | $10,879,647 | $18,626,177 | +$7,746,530 | +71.20% | |
| Aqr Capital Management Llc | 0.00% | 345,126 | $10,336,538 | $18,629,901 | +$8,293,363 | +80.23% | |
| Allspring Global Investments Holdings, Llc | 0.02% | 307,624 | $10,243,880 | $16,605,544 | +$6,361,664 | +62.10% | |
| Gotham Asset Management, Llc | 0.03% | 312,246 | $9,845,116 | $16,855,039 | +$7,009,923 | +71.20% | |
| Rhumbline Advisers | 0.01% | 308,407 | $9,724,037 | $16,647,810 | +$6,923,773 | +71.20% | |
| Jacobs Levy Equity Management, Inc | 0.04% | 308,102 | $9,714,456 | $16,631,346 | +$6,916,890 | +71.20% | |
| Man Group Plc | 0.02% | 306,349 | $9,659,184 | $16,536,719 | +$6,877,535 | +71.20% | |
| Sirios Capital Management L P | 1.14% | 298,421 | $9,409,214 | $16,108,766 | +$6,699,552 | +71.20% | |
| Frontier Capital Management Co Llc | 0.09% | 264,031 | $8,324,897 | $14,252,393 | +$5,927,496 | +71.20% | |
| Peregrine Capital Management Llc | 0.30% | 259,764 | $8,190,359 | $14,022,061 | +$5,831,702 | +71.20% | |
| Swiss National Bank | 0.00% | 256,400 | $8,084,292 | $13,840,472 | +$5,756,180 | +71.20% |
Frequently asked questions about ALGM
Who owns the most ALGM stock?
The largest holders of ALGM are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ALLEGRO MICROSYSTEMS INC (ALGM).
Is ALGM widely held by superinvestors?
Many widely followed stocks like ALGM appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ALGM is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.