Latest Period
Q2 2026
Security Snapshot
Mayville Engineering Company, Inc. - COMMON STOCK (MEC) Institutional Ownership
CUSIP: 578605107
13F Institutional Holders and Ownership History from Q2 2019 to Q2 2026
Institutions Reporting
154
Shares (Excl. Options)
21,176,924
Price
$37.46
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / COMMON STOCK
- Symbol
- MEC on NYSE
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 21,176,924
- Total 13F value
- $790,576,929
- Portfolio coverage rank
- 0%
- Share change
- +6,136,747
- Value change
- +$251,447,351
- Number of holders
- 154
- Shares outstanding
- 25,603,402
- SEC-reported price per share
- $25.89
- Insider filing price
- $25.89
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
Key facts
- MEC - Mayville Engineering Company, Inc. - COMMON STOCK is tracked under CUSIP 578605107.
- 154 institutions reported positions in Q2 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 124 to 154 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $258,445,730 to $790,576,929.
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 154 institutions filings for Q2 2026.
Security key
578605107
Latest holder period
Q2 2026
13F holders
154
13D/G owners
4
CIK / CUSIP context first
Open Q2 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
4
Security
MEC
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Portolan Capital Management, LLC | 5.9% | $26,677,723 | 1,465,004 | Portolan Capital Management, LLC | 20 May 2026 | |||
| FMR LLC | 5% | $44,050,654 | 1,280,170 | FMR LLC | 30 Jun 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 |
As of 30 Jun 2026, 154 institutional investors reported holding 21,176,924 shares of Mayville Engineering Company, Inc. - COMMON STOCK (MEC). This represents 83% of the company’s total 25,603,402 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
59%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Portolan Capital Management, LLC | 5.1% | 1,299,256 | +58% | 1.8% | $48,670,130 |
| FMR LLC | 5% | 1,280,170 | +29944% | 0% | $47,955,173 |
| BlackRock, Inc. | 4.6% | 1,183,443 | +34% | 0% | $44,331,785 |
| Allspring Global Investments Holdings, LLC | 4.2% | 1,072,916 | -46% | 0.06% | $37,777,372 |
| Driehaus Capital Management LLC | 3.3% | 846,354 | 0.18% | $31,704,421 | |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 3.1% | 800,000 | 0.78% | $29,968,000 | |
| DIMENSIONAL FUND ADVISORS LP | 3.1% | 782,276 | -16% | 0.01% | $29,304,240 |
| ROYCE & ASSOCIATES LP | 2.9% | 752,083 | +0.14% | 0.23% | $28,173,029 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.9% | 743,621 | +25% | 0% | $27,856,043 |
| Boston Partners | 2.7% | 696,429 | +199% | 0.02% | $25,813,603 |
| Jupiter Topco LLC | 2.2% | 575,278 | 0% | 0.01% | $21,549,914 |
| BLAIR WILLIAM & CO/IL | 2.1% | 546,714 | -3.3% | 0.05% | $20,479,906 |
| WELLINGTON MANAGEMENT GROUP LLP | 1.9% | 477,583 | 0% | $17,890,259 | |
| EVR Research LP | 1.7% | 441,908 | -29% | 8.2% | $16,553,874 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.5% | 374,578 | +12% | 0% | $14,035,404 |
| First Eagle Investment Management, LLC | 1.4% | 369,575 | -8.5% | 0.02% | $13,844,280 |
| JANE STREET GROUP, LLC | 1.4% | 356,151 | 0.01% | $13,341,417 | |
| JPMORGAN CHASE & CO | 1.4% | 347,224 | +6235% | 0% | $13,034,789 |
| KENNEDY CAPITAL MANAGEMENT LLC | 1.3% | 336,377 | +215% | 0.22% | $12,600,682 |
| Ophir Asset Management Pty Ltd | 1.3% | 326,699 | 1% | $12,238,145 | |
| Granahan Investment Management, LLC | 1.3% | 324,108 | -16% | 0.43% | $12,141,086 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | 1.2% | 313,943 | +16% | 0.08% | $11,760,305 |
| STATE STREET CORP | 1.1% | 291,168 | +1.9% | 0% | $10,907,153 |
| Nuveen, LLC | 1.1% | 281,914 | +495% | 0% | $10,560,498 |
| BANK OF AMERICA CORP /DE/ | 1.1% | 276,317 | +51% | 0% | $10,350,836 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
29
Latest
Q2 2026
Rows shown
1-25 of 29
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 21,176,924 | $790,576,929 | +$251,447,351 | $37.46 | 154 |
| 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 |
| 2020 Q2 | 6,289,280 | $49,684,412 | +$5,055,444 | $7.90 | 52 |