MAYVILLE, WI
MAYVILLE ENGINEERING COMPANY, INC.MEC— Latest position per institution from SEC 13F filings
15
Institutional holders
14.54M
Total shares held
504.68M
Estimated value
726.85K
Avg. position size
PORTOLAN CAPITAL MANAGEMENT, LLC
CIK 1350290
Shares
1.30M
Value
48.67M
Filed
Jun 30, 2026
FMR LLC
CIK 315066
Shares
1.28M
Value
47.96M
Filed
Jun 30, 2026
BLACKROCK, INC.
CIK 2012383
Shares
1.18M
Value
44.33M
Filed
Jun 30, 2026
ALLSPRING GLOBAL INVESTMENTS HOLDINGS, LLC
CIK 1890906
Shares
1.07M
Value
37.78M
Filed
Jun 30, 2026
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
849.57K
Value
14.15M
Filed
Jun 30, 2024
DRIEHAUS CAPITAL MANAGEMENT LLC
CIK 938206
Shares
846.35K
Value
31.70M
Filed
Jun 30, 2026
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC
CIK 1638555
Shares
800K
Value
29.97M
Filed
Jun 30, 2026
DIMENSIONAL FUND ADVISORS LP
CIK 354204
Shares
782.28K
Value
29.30M
Filed
Jun 30, 2026
ROYCE & ASSOCIATES LP
CIK 906304
Shares
752.08K
Value
28.17M
Filed
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
743.62K
Value
27.86M
Filed
Jun 30, 2026
BOSTON PARTNERS
CIK 1386060
Shares
696.43K
Value
25.81M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
627.65K
Value
11.75M
Filed
Dec 31, 2025
JUPITER TOPCO LLC
CIK 2146052
Shares
575.28K
Value
21.55M
Filed
Jun 30, 2026
BLAIR WILLIAM & CO/IL
CIK 902367
Shares
546.71K
Value
20.48M
Filed
Jun 30, 2026
WELLINGTON MANAGEMENT GROUP LLP
CIK 902219
Shares
477.58K
Value
17.89M
Filed
Jun 30, 2026
EVR RESEARCH LP
CIK 1843019
Shares
441.91K
Value
16.55M
Filed
Jun 30, 2026
22NW, LP
CIK 1694297
Shares
414.28K
Value
7.76M
Filed
Dec 31, 2025
JANE STREET GROUP, LLC
CIK 1595888
Shares
403.35K
Value
15.11M
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
374.58K
Value
14.04M
Filed
Jun 30, 2026
FIRST EAGLE INVESTMENT MANAGEMENT, LLC
CIK 1325447
Shares
369.57K
Value
13.84M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | PORTOLAN CAPITAL MANAGEMENT, LLC | 1350290 | 1.30M | 48.67M | Jun 30, 2026 |
| 2 | FMR LLC | 315066 | 1.28M | 47.96M | Jun 30, 2026 |
| 3 | BLACKROCK, INC. | 2012383 | 1.18M | 44.33M | Jun 30, 2026 |
| 4 | ALLSPRING GLOBAL INVESTMENTS HOLDINGS, LLC | 1890906 | 1.07M | 37.78M | Jun 30, 2026 |
| 5 | BLACKROCK FINANCE, INC. | 1364742 | 849.57K | 14.15M | Jun 30, 2024 |
| 6 | DRIEHAUS CAPITAL MANAGEMENT LLC | 938206 | 846.35K | 31.70M | Jun 30, 2026 |
| 7 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | 1638555 | 800K | 29.97M | Jun 30, 2026 |
| 8 | DIMENSIONAL FUND ADVISORS LP | 354204 | 782.28K | 29.30M | Jun 30, 2026 |
| 9 | ROYCE & ASSOCIATES LP | 906304 | 752.08K | 28.17M | Jun 30, 2026 |
| 10 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 743.62K | 27.86M | Jun 30, 2026 |
| 11 | BOSTON PARTNERS | 1386060 | 696.43K | 25.81M | Jun 30, 2026 |
| 12 | VANGUARD GROUP INC | 102909 | 627.65K | 11.75M | Dec 31, 2025 |
| 13 | JUPITER TOPCO LLC | 2146052 | 575.28K | 21.55M | Jun 30, 2026 |
| 14 | BLAIR WILLIAM & CO/IL | 902367 | 546.71K | 20.48M | Jun 30, 2026 |
| 15 | WELLINGTON MANAGEMENT GROUP LLP | 902219 | 477.58K | 17.89M | Jun 30, 2026 |
| 16 | EVR RESEARCH LP | 1843019 | 441.91K | 16.55M | Jun 30, 2026 |
| 17 | 22NW, LP | 1694297 | 414.28K | 7.76M | Dec 31, 2025 |
| 18 | JANE STREET GROUP, LLC | 1595888 | 403.35K | 15.11M | Jun 30, 2026 |
| 19 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 374.58K | 14.04M | Jun 30, 2026 |
| 20 | FIRST EAGLE INVESTMENT MANAGEMENT, LLC | 1325447 | 369.57K | 13.84M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.