梅維爾工程公司
US ˙ NYSE ˙ US5786051079

SecurityMEC / Mayville Engineering Company, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership1,637 shares
Latest Disclosed Value $ 29,385
Citigroup Inc reports 17.69% increase in ownership of MEC / Mayville Engineering Company, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 1,637 shares of Mayville Engineering Company, Inc. (US:MEC) valued at $29,384 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,391 shares of Mayville Engineering Company, Inc.. This represents a change in shares of 17.69% during the quarter. The current value of the position is $53,497 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)
2026-05-11 2026-03-31 13F MAYVILLE ENGR COM 578605107 1,637 246 17.69 29 11.54 0.0000
2026-02-13 2025-12-31 13F MAYVILLE ENGR COM 578605107 1,391 167 13.64 26 62.50 0.0000
2025-11-10 2025-09-30 13F MAYVILLE ENGR COM 578605107 1,224 -4,511 -78.66 17 -82.42 0.0000
2025-08-11 2025-06-30 13F MAYVILLE ENGR COM 578605107 5,735 -3,921 -40.61 92 -29.46 0.0000
2025-05-12 2025-03-31 13F MAYVILLE ENGR COM 578605107 9,656 -923 -8.72 130 -22.29 0.0001
2025-02-12 2024-12-31 13F MAYVILLE ENGR COM 578605107 10,579 878 9.05 166 -18.63 0.0001
2024-11-12 2024-09-30 13F MAYVILLE ENGR COM 578605107 9,701 6,448 198.22 204 277.78 0.0001
2024-08-12 2024-06-30 13F MAYVILLE ENGR COM 578605107 3,253 889 37.61 54 63.64 0.0000
2024-05-10 2024-03-31 13F MAYVILLE ENGR COM 578605107 2,364 551 30.39 34 26.92 0.0000
2024-02-09 2023-12-31 13F MAYVILLE ENGR COM 578605107 1,813 1,803 18,030.00 26 0.0000
2023-12-06 2023-09-30 13F/A-1 MAYVILLE ENGR COM 578605107 10 -3,289 -99.70 0 -100.00 0.0000
2023-11-09 2023-09-30 13F MAYVILLE ENGR COM 578605107 10 -3,289 0 0.0000
2023-08-10 2023-06-30 13F MAYVILLE ENGR COM 578605107 3,299 -21,048 -86.45 41 -88.71 0.0000
2023-05-11 2023-03-31 13F MAYVILLE ENGR COM 578605107 24,347 10,543 76.38 363 108.62 0.0003
2023-02-09 2022-12-31 13F MAYVILLE ENGR COM 578605107 13,804 13,804 175 0.0001
2022-11-10 2022-09-30 13F MAYVILLE ENGR COM 578605107 0 -86 -100.00 0 -100.00
2022-08-10 2022-06-30 13F MAYVILLE ENGR COM 578605107 86 -300 -77.72 1 -75.00 0.0000
2022-05-12 2022-03-31 13F MAYVILLE ENGR COM 578605107 386 -1,890 -83.04 4 -88.24 0.0000
2022-02-10 2021-12-31 13F MAYVILLE ENGR COM 578605107 2,276 1,099 93.37 34 54.55 0.0000
2021-11-10 2021-09-30 13F MAYVILLE ENGR COM 578605107 1,177 752 176.94 22 144.44 0.0000
2021-08-10 2021-06-30 13F MAYVILLE ENGR COM 578605107 425 -63 -12.91 9 28.57 0.0000
2021-05-13 2021-03-31 13F MAYVILLE ENGINEERING COM 578605107 488 -1,017 -67.57 7 -65.00 0.0000
2021-02-11 2020-12-31 13F MAYVILLE ENGINEERING COM 578605107 1,505 1,152 326.35 20 566.67 0.0000
2020-11-12 2020-09-30 13F MAYVILLE ENGINEERING COM 578605107 353 -696 -66.35 3 -62.50 0.0000
2020-08-12 2020-06-30 13F MAYVILLE ENGINEERING COM 578605107 1,049 -697 -39.92 8 -27.27 0.0000
2020-05-12 2020-03-31 13F MAYVILLE ENGINEERING COM 578605107 1,746 467 36.51 11 -8.33 0.0000
2020-02-12 2019-12-31 13F MAYVILLE ENGINEERING COM 578605107 1,279 967 309.94 12 200.00 0.0000
2019-11-08 2019-09-30 13F MAYVILLE ENGINEERING COM 578605107 312 -1,454 -82.33 4 -83.33 0.0000
2019-08-12 2019-06-30 13F MAYVILLE ENGINEERING COM 578605107 1,766 1,766 24 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.