Allegro MicroSystems, Inc.
MX ˙ BMV ˙ US01749D1054
SecurityMX:ALGM / Allegro MicroSystems, Inc.
InstitutionLegal & General Group Plc
Latest Disclosed Ownership164,671 shares
Latest Disclosed Value $ 5,192,067
Legal & General Group Plc reports 11.30% decrease in ownership of ALGM / Allegro MicroSystems, Inc.

On May 8, 2026 - Legal & General Group Plc filed a 13F-HR form disclosing ownership of 164,671 shares of Allegro MicroSystems, Inc. (MX:ALGM) valued at $5,192,067 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 185,648 shares of Allegro MicroSystems, Inc.. This represents a change in shares of -11.30% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-08 2026-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 164,671 -20,977 -11.30 5,192 6.02 0.0006
2026-02-09 2025-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 185,648 -11,329 -5.75 4,897 -14.85 0.0011
2025-11-13 2025-09-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 196,977 -5,504 -2.72 5,752 -16.92 0.0013
2025-08-12 2025-06-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 202,481 6,698 3.42 6,923 40.69 0.0017
2025-05-15 2025-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 195,783 6,380 3.37 4,920 18.84 0.0013
2025-02-13 2024-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 189,403 -5,660 -2.90 4,140 -8.89 0.0011
2025-02-28 2024-09-30 13F/A-2 ALLEGRO MICROSYSTEMS COM 01749D105 195,063 77,001 65.22 4,545 36.29 0.0012
2024-11-14 2024-09-30 13F/A-1 ALLEGRO MICROSYSTEMS COM 01749D105 208,747 81,556 4,864 0.0010
2024-11-14 2024-09-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 208,747 81,556 4,864 0.0005
2025-05-29 2024-06-30 13F/A-1 ALLEGRO MICROSYSTEMS COM 01749D105 118,062 1,833 1.58 3,334 6.42 0.0009
2024-08-14 2024-06-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 127,191 10,962 3,592 0.0008
2025-05-29 2024-03-31 13F/A-2 ALLEGRO MICROSYSTEMS COM 01749D105 116,229 1,259 1.10 3,134 -9.97 0.0009
2024-07-01 2024-03-31 13F/A-1 ALLEGRO MICROSYSTEMS COM 01749D105 116,229 1,259 3,134 0.0007
2024-05-14 2024-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 116,229 1,259 3,134 0.0004
2025-05-29 2023-12-31 13F/A-1 ALLEGRO MICROSYSTEMS COM 01749D105 114,970 983 0.86 3,480 -4.40 0.0011
2024-02-15 2023-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 114,970 983 3,480 0.0009
2023-11-14 2023-09-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 113,987 3,569 3.23 3,641 -26.97 0.0013
2023-08-14 2023-06-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 110,418 8,738 8.59 4,984 2.15 0.0016
2023-05-15 2023-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 101,680 7,931 8.46 4,880 73.38 0.0017
2023-02-14 2022-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 93,749 45,882 95.85 2,814 169.02 0.0011
2022-11-14 2022-09-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 47,867 2,711 6.00 1,046 11.99 0.0004
2022-08-22 2022-06-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 45,156 3,246 7.75 934 -21.51 0.0003
2022-05-16 2022-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 41,910 725 1.76 1,190 -20.13 0.0004
2022-02-14 2021-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 41,185 41 0.10 1,490 13.31 0.0005
2021-11-15 2021-09-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 41,144 8,823 27.30 1,315 46.76 0.0004
2021-08-12 2021-06-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 32,321 27,919 634.23 896 700.00 0.0003
2021-05-17 2021-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 4,402 2,023 85.04 112 75.00 0.0000
2021-02-12 2020-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 2,379 2,379 64 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.