Mayville Engineering Company, Inc.
US ˙ NYSE ˙ US5786051079

SecurityMEC / Mayville Engineering Company, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership100,384 shares
Latest Disclosed Value $ 1,801,893
Northern Trust Corp reports 6.38% increase in ownership of MEC / Mayville Engineering Company, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 100,384 shares of Mayville Engineering Company, Inc. (US:MEC) valued at $1,801,893 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 94,368 shares of Mayville Engineering Company, Inc.. This represents a change in shares of 6.38% during the quarter. The current value of the position is $3,280,549 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)
2026-05-14 2026-03-31 13F MAYVILLE ENGR COM 578605107 100,384 6,016 6.38 1,802 1.98 0.0000
2026-02-17 2025-12-31 13F MAYVILLE ENGR COM 578605107 94,368 -14,862 -13.61 1,767 17.50 0.0000
2025-11-14 2025-09-30 13F MAYVILLE ENGR COM 578605107 109,230 7,492 7.36 1,503 -7.39 0.0000
2025-08-13 2025-06-30 13F MAYVILLE ENGR COM 578605107 101,738 1,829 1.83 1,624 21.03 0.0002
2025-05-13 2025-03-31 13F MAYVILLE ENGR COM 578605107 99,909 -1,425 -1.41 1,342 -15.77 0.0002
2025-02-14 2024-12-31 13F MAYVILLE ENGR COM 578605107 101,334 3,134 3.19 1,593 -23.09 0.0002
2024-11-13 2024-09-30 13F MAYVILLE ENGR COM 578605107 98,200 9,998 11.34 2,070 40.91 0.0003
2024-08-14 2024-06-30 13F MAYVILLE ENGR COM 578605107 88,202 -1,764 -1.96 1,469 13.96 0.0002
2024-05-14 2024-03-31 13F MAYVILLE ENGR COM 578605107 89,966 -7,500 -7.69 1,289 -8.26 0.0002
2024-02-13 2023-12-31 13F MAYVILLE ENGR COM 578605107 97,466 11,400 13.25 1,405 48.83 0.0003
2023-11-13 2023-09-30 13F MAYVILLE ENGR COM 578605107 86,066 5 0.01 944 -11.94 0.0002
2023-08-11 2023-06-30 13F MAYVILLE ENGR COM 578605107 86,061 69,073 406.60 1,072 323.72 0.0002
2023-05-15 2023-03-31 13F MAYVILLE ENGR COM 578605107 16,988 1,803 11.87 253 31.77 0.0001
2023-02-13 2022-12-31 13F MAYVILLE ENGR COM 578605107 15,185 964 6.78 192 106.45 0.0000
2022-11-14 2022-09-30 13F MAYVILLE ENGR COM 578605107 14,221 0 0.00 93 -15.45 0.0000
2022-08-12 2022-06-30 13F MAYVILLE ENGR COM 578605107 14,221 -58,699 -80.50 110 -83.89 0.0000
2022-05-13 2022-03-31 13F MAYVILLE ENGR COM 578605107 72,920 -5,291 -6.77 683 -41.42 0.0001
2022-02-08 2021-12-31 13F MAYVILLE ENGR COM 578605107 78,211 1,863 2.44 1,166 -18.75 0.0002
2021-11-15 2021-09-30 13F MAYVILLE ENGR COM 578605107 76,348 -28,427 -27.13 1,435 -31.89 0.0003
2021-08-13 2021-06-30 13F MAYVILLE ENGR COM 578605107 104,775 5,632 5.68 2,107 47.76 0.0004
2021-05-12 2021-03-31 13F MAYVILLE ENGINEERING COM 578605107 99,143 -2,782 -2.73 1,426 4.32 0.0003
2021-02-11 2020-12-31 13F MAYVILLE ENGINEERING COM 578605107 101,925 -3,461 -3.28 1,367 41.07 0.0003
2020-11-16 2020-09-30 13F MAYVILLE ENGINEERING COM 578605107 105,386 20,896 24.73 969 45.28 0.0002
2020-08-14 2020-06-30 13F MAYVILLE ENGINEERING COM 578605107 84,490 9,311 12.39 667 44.69 0.0002
2020-05-14 2020-03-31 13F MAYVILLE ENGINEERING COM 578605107 75,179 -2,995 -3.83 461 -37.11 0.0001
2020-02-14 2019-12-31 13F MAYVILLE ENGINEERING COM 578605107 78,174 216 0.28 733 -28.70 0.0002
2019-11-13 2019-09-30 13F MAYVILLE ENGINEERING COM 578605107 77,958 52,494 206.15 1,028 192.05 0.0002
2019-08-13 2019-06-30 13F MAYVILLE ENGINEERING COM 578605107 25,464 25,464 352 0.0001
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.