Mayville Engineering Company, Inc.
MEC- Exchange
- NYSE
- Industry
- Metal Forgings & Stampings
- SEC CIK
- 0001766368
In the last 90 days, Mayville Engineering Company, Inc. insiders filed 0 open-market purchases and 1 sale; 155 institutions reported holding it in 13F filings for Q2 2026, worth $790.6M in total; no superinvestor holds it.
Holders of 5% or more of MEC
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Mayville Engineering Company, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Allspring Global Investments Holdings, LLC | 13G/A | 10.10%2.05M shares | −1.70 ppfrom 11.80% | Jan 13, 20252 filings | Jan 8, 2026 | SEC |
| Portolan Capital Management, LLC | 13G | 5.92%1.47M shares | New | May 28, 20261 filing | May 28, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
5 Schedule 13D and 13G filings on Mayville Engineering Company, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 28, 20266:50 PM ET | Portolan Capital Management, LLCand 1 other | 13G | 5.92%1.47M shares | New | May 20, 2026 | SEC |
| Feb 13, 20269:36 AM ET | Hilve Holdings Ltdand 1 other | 13G/A | 4.90%995.8K shares | −0.40 ppfrom 5.30%Below 5% | Oct 27, 2025 | SEC |
| Jan 8, 202611:46 AM ET | Allspring Global Investments Holdings, LLC | 13G/A | 10.10%2.05M shares | −1.70 ppfrom 11.80% | Dec 31, 2025 | SEC |
| Oct 29, 20252:00 PM ET | Hilve Holdings Ltdand 1 other | 13G | 5.30%1.07M shares | New | Oct 27, 2025 | SEC |
| Jan 13, 20252:59 PM ET | Allspring Global Investments Holdings, LLC | 13G/A | 11.80%2.44M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Mayville Engineering Company, Inc. shares.
No Form 144 notices for Mayville Engineering Company, Inc. are on file.