Mayville Engineering Company, Inc.
US ˙ NYSE ˙ US5786051079

SecurityMEC / Mayville Engineering Company, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership285,850 shares
Latest Disclosed Value $ 5,131,008
State Street Corp reports 0.30% increase in ownership of MEC / Mayville Engineering Company, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 285,850 shares of Mayville Engineering Company, Inc. (US:MEC) valued at $5,131,008 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 285,000 shares of Mayville Engineering Company, Inc.. This represents a change in shares of 0.30% during the quarter. The current value of the position is $9,341,578 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 285,850 850 0.30 5,131 -3.82 0.0002
2026-02-13 2025-12-31 13F MAYVILLE ENGR COM 578605107 285,000 10,064 3.66 5,335 41.03 0.0002
2025-11-14 2025-09-30 13F MAYVILLE ENGR COM 578605107 274,936 9,886 3.73 3,783 -10.57 0.0001
2025-08-14 2025-06-30 13F MAYVILLE ENGR COM 578605107 265,050 12,681 5.02 4,230 24.82 0.0002
2025-05-15 2025-03-31 13F MAYVILLE ENGR COM 578605107 252,369 2,400 0.96 3,389 -13.74 0.0001
2025-02-14 2024-12-31 13F MAYVILLE ENGR COM 578605107 249,969 18,441 7.96 3,930 -19.49 0.0002
2024-11-14 2024-09-30 13F MAYVILLE ENGR COM 578605107 231,528 -5,187 -2.19 4,881 23.76 0.0002
2024-08-14 2024-06-30 13F MAYVILLE ENGR COM 578605107 236,715 47,254 24.94 3,944 45.28 0.0002
2024-05-15 2024-03-31 13F MAYVILLE ENGR COM 578605107 189,461 7,363 4.04 2,715 3.39 0.0001
2024-02-14 2023-12-31 13F MAYVILLE ENGR COM 578605107 182,098 8,400 4.84 2,626 37.80 0.0001
2023-11-14 2023-09-30 13F MAYVILLE ENGR COM 578605107 173,698 13,886 8.69 1,905 -4.32 0.0001
2023-08-14 2023-06-30 13F MAYVILLE ENGR COM 578605107 159,812 119,359 295.06 1,991 230.18 0.0001
2023-05-15 2023-03-31 13F MAYVILLE ENGR COM 578605107 40,453 6,500 19.14 604 40.56 0.0000
2023-05-15 2022-12-31 13F/A-99 MAYVILLE ENGR COM 578605107 33,953 0 0.00 430 94.12 0.0000
2023-05-15 2022-12-31 13F MAYVILLE ENGR COM 578605107 33,953 0 430 0.0000
2022-11-15 2022-09-30 13F MAYVILLE ENGR COM 578605107 33,953 0 0.00 221 -15.97 0.0000
2022-08-15 2022-06-30 13F MAYVILLE ENGR COM 578605107 33,953 -112,148 -76.76 263 -80.79 0.0000
2022-05-16 2022-03-31 13F MAYVILLE ENGR COM 578605107 146,101 -6,332 -4.15 1,369 -39.77 0.0001
2022-02-14 2021-12-31 13F MAYVILLE ENGR COM 578605107 152,433 -12,377 -7.51 2,273 -26.63 0.0001
2021-11-15 2021-09-30 13F MAYVILLE ENGR COM 578605107 164,810 10,599 6.87 3,098 -0.10 0.0002
2021-08-16 2021-06-30 13F MAYVILLE ENGR COM 578605107 154,211 44,031 39.96 3,101 95.77 0.0002
2021-07-09 2021-03-31 13F/A-1 MAYVILLE ENGINEERING COM 578605107 110,180 18,880 20.68 1,584 29.31 0.0001
2021-05-17 2021-03-31 13F MAYVILLE ENGINEERING COM 578605107 110,180 18,880 1,584 0.0001
2021-02-16 2020-12-31 13F MAYVILLE ENGINEERING COM 578605107 91,300 -4,717 -4.91 1,225 38.89 0.0001
2020-11-10 2020-09-30 13F MAYVILLE ENGINEERING COM 578605107 96,017 -2,381 -2.42 882 13.51 0.0001
2020-08-14 2020-06-30 13F MAYVILLE ENGINEERING COM 578605107 98,398 -264 -0.27 777 28.43 0.0001
2020-06-19 2020-03-31 13F/A-1 MAYVILLE ENGINEERING COM 578605107 98,662 4,094 4.33 605 -31.79 0.0001
2020-05-11 2020-03-31 13F MAYVILLE ENGINEERING COM 578605107 98,662 4,094 605 53.1312
2020-02-06 2019-12-31 13F MAYVILLE ENGINEERING COM 578605107 94,568 24,856 35.66 887 -3.59 0.0001
2019-11-14 2019-09-30 13F MAYVILLE ENGINEERING COM 578605107 69,712 5,891 9.23 920 78.29 0.0001
2019-08-14 2019-06-30 13F MAYVILLE ENGINEERING COM 578605107 63,821 63,821 516 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.