Allegro MicroSystems, Inc.
MX ˙ BMV ˙ US01749D1054
SecurityMX:ALGM / Allegro MicroSystems, Inc.
InstitutionWalleye Capital LLC
Latest Disclosed Ownership130,668 shares
Latest Disclosed Value $ 4,119,962
Walleye Capital LLC ownership in ALGM / Allegro MicroSystems, Inc.

On May 13, 2026 - Walleye Capital LLC filed a 13F-HR/A form disclosing ownership of 130,668 shares of Allegro MicroSystems, Inc. (MX:ALGM) valued at $4,119,962 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,605 shares of Allegro MicroSystems, Inc.. This represents a change in shares of 3,524.63% during the quarter.

Walleye Capital LLC has a history of taking positions in derivatives of the underlying security (ALGM) in the form of stock options. The firm currently holds call options representing 2,200 of underlying shares valued at $69,366 USD and put options representing 3,200 of underlying shares valued at $100,896 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:ALGM / Allegro MicroSystems, Inc. Historical Put/Call Ratio
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)
2026-05-13 2026-03-31 13F/A-1 ALLEGRO MICROSYSTEMS COM 01749D105 130,668 127,063 3,524.63 4,120 4,235.79 0.0171
2026-05-08 2026-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 130,668 127,063 4,120 0.0171
2026-02-13 2025-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 3,605 3,605 95 0.0003
2025-11-14 2025-09-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 0 -167 -100.00 0 -100.00
2025-08-13 2025-06-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 167 -489,133 -99.97 6 -99.96 0.0000
2025-05-14 2025-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 489,300 -226,143 -31.61 12,296 -21.38 0.0555
2025-02-13 2024-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 715,443 711,807 19,576.65 15,640 18,517.86 0.0382
2024-11-14 2024-09-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 3,636 3,636 85 0.0002
2024-08-14 2024-06-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 0 -82,308 -100.00 0 -100.00
2024-05-15 2024-03-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 82,308 53,287 183.62 2,219 152.73 0.0040
2024-02-14 2023-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 29,021 29,021 878 0.0019
2022-05-27 2021-12-31 13F/A-01 ALLEGRO MICROSYSTEMS COM 01749D105 0 -22,093 -100.00 0 -100.00
2022-03-03 2021-12-31 13F ALLEGRO MICROSYSTEMS COM 01749D105 0 -22,093 0
2021-11-15 2021-09-30 13F ALLEGRO MICROSYSTEMS COM 01749D105 22,093 22,093 706 0.0200
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-13 2026-03-31 13F/A ALLEGRO MICROSYSTEMS COM Call 2,200 -72.15 69 -66.83 n/a n/a n/a
2026-05-08 2026-03-31 13F ALLEGRO MICROSYSTEMS COM Call 2,200 69 n/a n/a n/a
2026-02-13 2025-12-31 13F ALLEGRO MICROSYSTEMS COM Call 7,900 208 n/a n/a n/a
2025-11-14 2025-09-30 13F ALLEGRO MICROSYSTEMS COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-13 2025-06-30 13F ALLEGRO MICROSYSTEMS COM Call 10,000 -67.43 342 -55.77 n/a n/a n/a
2025-05-14 2025-03-31 13F ALLEGRO MICROSYSTEMS COM Call 30,700 91.88 771 120.92 n/a n/a n/a
2025-02-13 2024-12-31 13F ALLEGRO MICROSYSTEMS COM Call 16,000 -56.28 350 -59.04 n/a n/a n/a
2024-11-14 2024-09-30 13F ALLEGRO MICROSYSTEMS COM Call 36,600 -61.39 853 -68.17 n/a n/a n/a
2024-08-14 2024-06-30 13F ALLEGRO MICROSYSTEMS COM Call 94,800 150.13 2,677 162.19 n/a n/a n/a
2024-05-15 2024-03-31 13F ALLEGRO MICROSYSTEMS COM Call 37,900 24.67 1,022 10.98 n/a n/a n/a
2024-02-14 2023-12-31 13F ALLEGRO MICROSYSTEMS COM Call 30,400 159.83 920 146.65 n/a n/a n/a
2023-11-21 2023-09-30 13F/A ALLEGRO MICROSYSTEMS COM Call 11,700 -55.51 374 -68.58 n/a n/a n/a
2023-11-14 2023-09-30 13F ALLEGRO MICROSYSTEMS COM Call 11,700 374 n/a n/a n/a
2023-08-14 2023-06-30 13F ALLEGRO MICROSYSTEMS COM Call 26,300 1,187 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-13 2026-03-31 13F/A ALLEGRO MICROSYSTEMS COM Put 3,200 -69.81 101 -64.16 n/a n/a n/a
2026-05-08 2026-03-31 13F ALLEGRO MICROSYSTEMS COM Put 3,200 101 n/a n/a n/a
2026-02-13 2025-12-31 13F ALLEGRO MICROSYSTEMS COM Put 10,600 280 n/a n/a n/a
2025-11-14 2025-09-30 13F ALLEGRO MICROSYSTEMS COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-13 2025-06-30 13F ALLEGRO MICROSYSTEMS COM Put 300 0.00 10 42.86 n/a n/a n/a
2025-05-14 2025-03-31 13F ALLEGRO MICROSYSTEMS COM Put 300 -99.02 8 -98.95 n/a n/a n/a
2025-02-13 2024-12-31 13F ALLEGRO MICROSYSTEMS COM Put 30,500 24.49 667 16.84 n/a n/a n/a
2024-11-14 2024-09-30 13F ALLEGRO MICROSYSTEMS COM Put 24,500 53.12 571 26.39 n/a n/a n/a
2024-08-14 2024-06-30 13F ALLEGRO MICROSYSTEMS COM Put 16,000 79.78 452 88.70 n/a n/a n/a
2024-05-15 2024-03-31 13F ALLEGRO MICROSYSTEMS COM Put 8,900 -29.92 240 -37.76 n/a n/a n/a
2024-02-14 2023-12-31 13F ALLEGRO MICROSYSTEMS COM Put 12,700 323.33 384 304.21 n/a n/a n/a
2023-11-21 2023-09-30 13F/A ALLEGRO MICROSYSTEMS COM Put 3,000 -84.21 96 -88.91 n/a n/a n/a
2023-11-14 2023-09-30 13F ALLEGRO MICROSYSTEMS COM Put 3,000 96 n/a n/a n/a
2023-08-14 2023-06-30 13F ALLEGRO MICROSYSTEMS COM Put 19,000 858 n/a n/a n/a
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.