Mayville Engineering Company, Inc.
US ˙ NYSE ˙ US5786051079

SecurityMEC / Mayville Engineering Company, Inc.
InstitutionBlackRock, Inc.
Latest Disclosed Ownership881,854 shares
Latest Disclosed Value $ 15,829,285
BlackRock, Inc. reports 1.88% increase in ownership of MEC / Mayville Engineering Company, Inc.

On May 13, 2026 - BlackRock, Inc. filed a 13F-HR form disclosing ownership of 881,854 shares of Mayville Engineering Company, Inc. (US:MEC) valued at $15,829,279 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 865,619 shares of Mayville Engineering Company, Inc.. This represents a change in shares of 1.88% during the quarter. The current value of the position is $28,818,989 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)
2026-05-13 2026-03-31 13F MAYVILLE ENGR COM 578605107 881,854 16,235 1.88 15,829 -2.31 0.0000
2026-02-12 2025-12-31 13F MAYVILLE ENGR COM 578605107 865,619 -49,220 -5.38 16,204 28.73 0.0003
2025-11-12 2025-09-30 13F MAYVILLE ENGR COM 578605107 914,839 1,650 0.18 12,588 -13.63 0.0002
2025-08-12 2025-06-30 13F MAYVILLE ENGR COM 578605107 913,189 63,598 7.49 14,574 27.73 0.0003
2025-05-02 2025-03-31 13F MAYVILLE ENGR COM 578605107 849,591 834 0.10 11,410 -14.48 0.0002
2025-02-07 2024-12-31 13F MAYVILLE ENGR COM 578605107 848,757 -48,853 -5.44 13,342 -29.49 0.0003
2024-11-13 2024-09-30 13F MAYVILLE ENGR COM 578605107 897,610 48,043 5.65 18,922 33.69 0.0004
2024-08-13 2024-06-30 13F MAYVILLE ENGR COM 578605107 849,567 125,278 17.30 14,154 36.36 0.0003
2024-05-10 2024-03-31 13F MAYVILLE ENGR COM 578605107 724,289 -23,753 -3.18 10,379 -3.77 0.0002
2024-02-13 2023-12-31 13F MAYVILLE ENGR COM 578605107 748,042 56,757 8.21 10,787 42.24 0.0003
2023-11-13 2023-09-30 13F MAYVILLE ENGR COM 578605107 691,285 717 0.10 7,583 -11.87 0.0002
2023-08-11 2023-06-30 13F MAYVILLE ENGR COM 578605107 690,568 509,856 282.14 8,604 219.14 0.0002
2023-05-12 2023-03-31 13F MAYVILLE ENGR COM 578605107 180,712 -43,037 -19.23 2,696 -4.80 0.0001
2023-02-13 2022-12-31 13F MAYVILLE ENGR COM 578605107 223,749 -15,076 -6.31 2,833 82.24 0.0001
2022-11-14 2022-09-30 13F MAYVILLE ENGR COM 578605107 238,825 15,426 6.91 1,554 -10.17 0.0001
2022-08-12 2022-06-30 13F MAYVILLE ENGR COM 578605107 223,399 -392,781 -63.74 1,730 -70.04 0.0001
2022-05-12 2022-03-31 13F MAYVILLE ENGR COM 578605107 616,180 1,001 0.16 5,774 -37.05 0.0002
2022-02-10 2021-12-31 13F MAYVILLE ENGR COM 578605107 615,179 2,589 0.42 9,173 -20.34 0.0002
2021-11-09 2021-09-30 13F MAYVILLE ENGR COM 578605107 612,590 -789 -0.13 11,515 -6.65 0.0003
2021-08-11 2021-06-30 13F MAYVILLE ENGR COM 578605107 613,379 146,865 31.48 12,335 83.86 0.0003
2021-05-07 2021-03-31 13F MAYVILLE ENGINEERING COM 578605107 466,514 13,935 3.08 6,709 10.44 0.0002
2021-02-05 2020-12-31 13F MAYVILLE ENGINEERING COM 578605107 452,579 42,254 10.30 6,075 61.10 0.0002
2020-11-06 2020-09-30 13F MAYVILLE ENGINEERING COM 578605107 410,325 19,394 4.96 3,771 22.12 0.0001
2020-08-14 2020-06-30 13F MAYVILLE ENGINEERING COM 578605107 390,931 59,000 17.77 3,088 51.74 0.0001
2020-05-01 2020-03-31 13F MAYVILLE ENGINEERING COM 578605107 331,931 2,426 0.74 2,035 -34.16 0.0001
2020-02-13 2019-12-31 13F MAYVILLE ENGINEERING COM 578605107 329,505 -18,558 -5.33 3,091 -32.67 0.0001
2019-11-08 2019-09-30 13F MAYVILLE ENGINEERING COM 578605107 348,063 46,537 15.43 4,591 10.33 0.0002
2019-08-22 2019-06-30 13F/A-1 MAYVILLE ENGINEERING COM 578605107 301,526 301,526 4,161 0.0002
2019-08-13 2019-06-30 13F MAYVILLE ENGINEERING COM 578605107 301,526 4,161 0.0002
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.