Mayville Engineering Company, Inc.
US ˙ NYSE ˙ US5786051079

SecurityMEC / Mayville Engineering Company, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership99,104 shares
Latest Disclosed Value $ 1,778,880
Advisor Group Holdings, Inc. reports 17.47% decrease in ownership of MEC / Mayville Engineering Company, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 99,104 shares of Mayville Engineering Company, Inc. (US:MEC) valued at $1,778,917 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 120,078 shares of Mayville Engineering Company, Inc.. This represents a change in shares of -17.47% during the quarter. The current value of the position is $3,295,208 USD.

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)
2026-05-15 2026-03-31 13F MAYVILLE ENGR COM 578605107 99,104 -20,974 -17.47 1,779 -20.87 0.0015
2026-02-17 2025-12-31 13F MAYVILLE ENGR COM 578605107 120,078 -1,708 -1.40 2,248 26.45 0.0033
2025-11-14 2025-09-30 13F MAYVILLE ENGR COM 578605107 121,786 -9,803 -7.45 1,777 -15.38 0.0025
2025-09-04 2025-06-30 13F/A-1 MAYVILLE ENGR COM 578605107 131,589 -13,281 -9.17 2,100 7.97 0.0037
2025-08-13 2025-06-30 13F MAYVILLE ENGR COM 578605107 130,257 -14,613 2,048 0.0024
2025-05-12 2025-03-31 13F MAYVILLE ENGR COM 578605107 144,870 14,203 10.87 1,946 -5.31 0.0043
2025-06-06 2024-12-31 13F/A-1 MAYVILLE ENGR COM 578605107 130,667 -34,948 -21.10 2,054 -41.16 0.0046
2025-02-07 2024-12-31 13F MAYVILLE ENGR COM 578605107 166,925 1,310 3,512 0.0090
2024-11-13 2024-09-30 13F MAYVILLE ENGR COM 578605107 165,615 -12,613 -7.08 3,491 17.58 0.0079
2024-08-13 2024-06-30 13F MAYVILLE ENGR COM 578605107 178,228 -8,333 -4.47 2,969 11.07 0.0070
2024-05-10 2024-03-31 13F MAYVILLE ENGR COM 578605107 186,561 -1,138 -0.61 2,673 -1.22 0.0060
2024-02-12 2023-12-31 13F MAYVILLE ENGR COM 578605107 187,699 -12,576 -6.28 2,707 23.22 0.0047
2023-11-13 2023-09-30 13F MAYVILLE ENGR COM 578605107 200,275 -14,638 -6.81 2,197 -17.97 0.0032
2023-08-21 2023-06-30 13F/A-1 MAYVILLE ENGR COM 578605107 214,913 83,736 63.83 2,678 36.79 0.0048
2023-08-10 2023-06-30 13F MAYVILLE ENGR COM 578605107 214,913 83,736 2,678 0.0007
2023-05-12 2023-03-31 13F MAYVILLE ENGR COM 578605107 131,177 -41,603 -24.08 1,957 -10.52 0.0037
2023-02-10 2022-12-31 13F MAYVILLE ENGR COM 578605107 172,780 -5,422 -3.04 2,187 88.53 0.0044
2022-11-14 2022-09-30 13F MAYVILLE ENGR COM 578605107 178,202 -4,312 -2.36 1,160 -17.85 0.0027
2022-08-10 2022-06-30 13F MAYVILLE ENGR COM 578605107 182,514 53,911 41.92 1,412 17.08 0.0031
2022-05-04 2022-03-31 13F MAYVILLE ENGR COM 578605107 128,603 -6,473 -4.79 1,206 -40.09 0.0023
2022-02-03 2021-12-31 13F MAYVILLE ENGR COM 578605107 135,076 -705 -0.52 2,013 -21.18 0.0038
2021-11-05 2021-09-30 13F MAYVILLE ENGR COM 578605107 135,781 1,229 0.91 2,554 -5.62 0.0053
2021-08-02 2021-06-30 13F MAYVILLE ENGR COM 578605107 134,552 28,366 26.71 2,706 77.21 0.0059
2021-05-13 2021-03-31 13F MAYVILLE ENGINEERING COM 578605107 106,186 -27,588 -20.62 1,527 -14.93 0.0037
2021-02-10 2020-12-31 13F MAYVILLE ENGINEERING COM 578605107 133,774 -24,835 -15.66 1,795 23.11 0.0048
2020-11-12 2020-09-30 13F MAYVILLE ENGINEERING COM 578605107 158,609 -6,907 -4.17 1,458 11.47 0.0044
2020-08-14 2020-06-30 13F MAYVILLE ENGINEERING COM 578605107 165,516 44,326 36.58 1,308 76.04 0.0044
2020-05-18 2020-03-31 13F MAYVILLE ENGINEERING COM 578605107 121,190 121,190 743 0.0030
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.