# MAYVILLE ENGR CO INC COM

MAYVILLE ENGR CO INC COM is a security (CUSIP 578605107) tracked across SEC portfolio filings. 129 institutional managers reported $332.1M on Form 13F as of 2026-06-30; 14 registered fund positions totaling $8.6M via N-PORT as of 2026-05-31.

## Summary

- Issuer: MAYVILLE ENGR CO INC
- Class: COM
- CUSIP: 578605107
- Asset category: EC
- 13F holders: 129
- 13F value: $332.1M
- 13F period: 2026-06-30
- N-PORT fund positions: 14
- N-PORT value: $8.6M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 129 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BlackRock, Inc. | New York, NY | $44.3M | 1,183,443 |
| Allspring Global Investments Holdings, LLC | CHARLOTTE, NC | $35.8M | 2,000,350 |
| Boston Partners | BOSTON, MA | $25.8M | 696,429 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $16.6M | 926,216 |
| Portolan Capital Management, LLC | Boston, MA | $14.7M | 821,136 |
| [First Eagle Investment Management, LLC](https://search.stillhousedata.com/firm/108260) | NEW YORK, NY | $13.8M | 369,575 |
| [ROYCE & ASSOCIATES LP](https://search.stillhousedata.com/firm/107689) | New York, NY | $13.5M | 751,001 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $11.7M | 627,655 |
| [EVR Research LP](https://search.stillhousedata.com/firm/283385) | RICHMOND, VA | $11.1M | 620,000 |
| STATE STREET CORP | BOSTON, MA | $10.9M | 291,168 |
| [BLAIR WILLIAM & CO/IL](https://search.stillhousedata.com/firm/1252) | Chicago, IL | $10.1M | 565,300 |
| [Granahan Investment Management, LLC](https://search.stillhousedata.com/firm/107745) | WALTHAM, MA | $7.0M | 387,470 |
| MILLENNIUM MANAGEMENT LLC | NEW YORK, NY | $6.8M | 380,972 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $6.0M | 335,835 |
| [SILVERCREST ASSET MANAGEMENT GROUP LLC](https://search.stillhousedata.com/firm/118333) | NEW YORK, NY | $4.8M | 269,681 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $2.9M | 0.36% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $1.8M | 1.03% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $1.0M | 1.39% |
| [TIFF MULTI-ASSET FUND](https://search.stillhousedata.com/fund/S000006387) | TIFF Investment Program | $772K | 5.55% |
| [Perritt MicroCap Opportunities Fund](https://search.stillhousedata.com/fund/S000039929) | Perritt Funds Inc | $588K | 94.36% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $413K | 0.86% |
| [Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF](https://search.stillhousedata.com/fund/S000048296) | Goldman Sachs ETF Trust | $413K | 4.18% |
| [Embark Small Cap Equity Fund](https://search.stillhousedata.com/fund/S000083503) | Harbor Funds II | $263K | 4.60% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $154K | 0.05% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $152K | 0.03% |
| [Vericimetry U.S. Small Cap Value Fund](https://search.stillhousedata.com/fund/S000033942) | VERICIMETRY FUNDS | $35K | 2.07% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $33K | 0.78% |
| [Longview Advantage ETF](https://search.stillhousedata.com/fund/S000086399) | RBB Fund Trust | $18K | 0.27% |
| [TIAA Separate Account VA-1 - Stock Index Account](https://search.stillhousedata.com/fund/S000005098) | TIAA Separate Account VA-1 | $16K | 0.12% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/578605107.md)
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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.