13F reference period
Q3 2026
Security Snapshot
Mayville Engineering Company, Inc. - COMMON STOCK (MEC) Institutional Ownership
CUSIP: 578605107
13F Institutional Holders and Ownership History from Q2 2019 to Q3 2026
Institutions Reporting
55
Shares (Excl. Options)
8.84M
Full value: 8,838,068 · shares · 30 Sep 2026Price
$15.00
The headline uses the Q3 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended.
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- Security type / class
- Equity / COMMON STOCK
- Symbol
- MEC on NYSE
- All holders as of 30 Sep 2026
- Q3 2026
- Total 13F shares
- 8,838,068
- Total 13F value
- $132,654,917
- Portfolio coverage rank
- 0%
- Share change
- +2,151,872
- Value change
- +$24,818,098
- Number of holders
- 55
- Shares outstanding
- 25,641,852
- SEC-reported price per share
- $15.00
- Insider filing price
- $15.00
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- MEC - Mayville Engineering Company, Inc. - COMMON STOCK is tracked under CUSIP 578605107.
- 55 institutions reported positions in Q3 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 155 to 55 between Q2 2026 and Q3 2026.
- SEC-reported value moved from to
$790.63M
Full value: $790,630,835 · USD · 30 Jun 2026.$132.65M
Full value: $132,654,917 · USD · 30 Sep 2026
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 55 institutions filings for Q3 2026.
Security key
578605107
13F reference period
Q3 2026
13F holders
55
13D/G owners
5
CIK / CUSIP context first
Open Q3 2026 holders
MEC full holder history
Mayville Engineering Company, Inc. SEC filings
Mayville Engineering Company, Inc. company facts
Mayville Engineering Company, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 578605107:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
MEC
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 6.3% | $24,083,775 | 1,605,585 | BlackRock, Inc. | 30 Sep 2026 | |||
| Portolan Capital Management, LLC | 5.9% | $26,677,723 | 1,465,004 | Portolan Capital Management, LLC | 20 May 2026 | |||
| Allspring Global Investments Holdings, LLC | 4.2% | -59% | $40,191,326 | -$36,699,352 | 1,072,916 | -48% | Allspring Global Investments Holdings, LLC | 30 Jun 2026 |
| Hilve Holdings Ltd | 4.9% | $18,331,868 | 995,756 | Hilve Holdings Ltd | 27 Oct 2025 | |||
| FMR LLC | 3.3% | -34% | $12,692,717 | -$6,509,835 | 846,181 | -34% | FMR LLC | 30 Sep 2026 |
As of 30 Sep 2026,
55
institutional investors reported holding
shares of
Mayville Engineering Company, Inc. - COMMON STOCK (MEC).
This represents
34%
of the company’s total
outstanding shares.
8.84M
Full value: 8,838,068 · shares · 30 Sep 202625.64M
Full value: 25,641,852 · shares · Stored outstanding share count13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
33%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | 3.4% | 875,324 | +18% | 0% | $13,129,860 |
| EVR Research LP | 2.9% | 735,000 | +66% | 6.2% | $11,025,000 |
| Qube Research & Technologies Ltd | 2.8% | 724,576 | +732% | 0.01% | $10,868,640 |
| DIMENSIONAL FUND ADVISORS LP | 2.7% | 685,124 | -12% | 0% | $10,279,847 |
| ROYCE & ASSOCIATES LP | 2.6% | 667,009 | -11% | 0.09% | $10,005,135 |
| BLAIR WILLIAM & CO/IL | 2.2% | 567,536 | +3.8% | 0.02% | $8,513,040 |
| GEODE CAPITAL MANAGEMENT, LLC | 2% | 511,450 | +37% | 0% | $7,673,768 |
| Pillsbury Lake Capital LLC | 1.5% | 394,906 | +189% | 2.3% | $5,923,590 |
| STATE STREET CORP | 1.4% | 346,613 | +19% | 0% | $5,199,195 |
| CenterBook Partners LP | 1.3% | 341,000 | +1000% | 0.23% | $5,115,000 |
| KENNEDY CAPITAL MANAGEMENT LLC | 1.3% | 327,200 | -2.7% | 0.09% | $4,908,000 |
| MORGAN STANLEY | 1.1% | 272,138 | +172% | 0% | $4,082,071 |
| First Eagle Investment Management, LLC | 1.1% | 269,294 | -27% | 0.01% | $4,039,410 |
| AWM Investment Company, Inc. | 0.8% | 206,008 | +14% | 0.3% | $3,090,120 |
| RENAISSANCE TECHNOLOGIES LLC | 0.65% | 167,319 | +498% | 0% | $2,509,785 |
| FORMULA GROWTH LTD | 0.64% | 165,000 | +120% | 0.95% | $2,475,000 |
| HUNTER ASSOCIATES INVESTMENT MANAGEMENT LLC | 0.64% | 164,045 | +53% | 0.29% | $2,465,000 |
| BNP PARIBAS FINANCIAL MARKETS | 0.55% | 139,757 | 0% | $2,096,355 | |
| VANGUARD FIDUCIARY TRUST CO | 0.54% | 139,720 | +42% | 0% | $2,095,800 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.53% | 136,405 | +39% | 0% | $2,046,075 |
| Bastion Asset Management Inc. | 0.5% | 128,210 | 0.85% | $1,951,888 | |
| Empowered Funds, LLC | 0.49% | 126,549 | +8.6% | 0.01% | $1,898,235 |
| ANCHOR CAPITAL ADVISORS LLC | 0.42% | 108,067 | +34% | 0.05% | $1,621,005 |
| Diamond Hill Capital Management, LLC (Investment Advisor) | 0.41% | 105,520 | 0.02% | $1,582,800 | |
| Essential Investment Partners LLC | 0.23% | 59,236 | +0.59% | 0.6% | $888,540 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
30
Headline period
Q3 2026
Rows shown
1-25 of 30
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q3 | 8,838,068 | $132,654,917 | +$24,818,098 | $15.00 | 55 |
| 2026 Q2 | 21,178,363 | $790,630,835 | +$251,473,423 | $37.46 | 155 |
| 2026 Q1 | 14,401,113 | $258,445,730 | +$6,822,067 | $17.95 | 124 |
| 2025 Q4 | 13,849,261 | $259,718,429 | +$8,554,832 | $18.72 | 121 |
| 2025 Q3 | 13,280,220 | $183,556,400 | +$8,031,418 | $13.76 | 103 |
| 2025 Q2 | 12,642,160 | $202,514,421 | +$5,377,585 | $15.96 | 110 |
| 2025 Q1 | 12,437,195 | $167,800,883 | -$810,093 | $13.43 | 116 |
| 2024 Q4 | 12,460,649 | $195,440,685 | +$9,374,940 | $15.72 | 112 |
| 2024 Q3 | 11,684,841 | $246,299,140 | +$18,925,395 | $21.08 | 116 |
| 2024 Q2 | 10,752,150 | $179,129,526 | +$20,360,389 | $16.66 | 97 |
| 2024 Q1 | 9,531,006 | $136,580,309 | +$3,169,998 | $14.33 | 79 |
| 2023 Q4 | 9,251,605 | $133,377,230 | +$5,544,845 | $14.42 | 79 |
| 2023 Q3 | 8,911,760 | $97,758,808 | +$2,587,678 | $10.97 | 86 |
| 2023 Q2 | 8,722,452 | $108,700,974 | +$9,649,984 | $12.46 | 86 |
| 2023 Q1 | 7,826,872 | $116,753,603 | +$12,817,034 | $14.92 | 77 |
| 2022 Q4 | 6,970,927 | $88,250,006 | +$6,859,659 | $12.66 | 67 |
| 2022 Q3 | 6,343,054 | $41,305,039 | -$6,939,617 | $6.51 | 57 |
| 2022 Q2 | 7,177,044 | $55,551,627 | -$3,587,082 | $7.74 | 56 |
| 2022 Q1 | 7,472,090 | $70,024,999 | -$530,598 | $9.37 | 63 |
| 2021 Q4 | 7,272,472 | $108,421,167 | -$38,311,391 | $14.91 | 66 |
| 2021 Q3 | 7,482,295 | $140,767,921 | -$13,460,823 | $18.80 | 74 |
| 2021 Q2 | 8,181,835 | $164,531,717 | +$15,440,462 | $20.11 | 58 |
| 2021 Q1 | 7,432,250 | $106,883,984 | +$3,659,676 | $14.38 | 59 |
| 2020 Q4 | 7,179,707 | $96,216,902 | +$5,892,826 | $13.42 | 53 |
| 2020 Q3 | 6,765,494 | $62,171,216 | +$5,572,335 | $9.19 | 49 |