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Disclosery

MEC MAYVILLE ENGR CO INC

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COMMON STOCK (common), issuer CIK 1766368

104 managers (104 13F filers) reported a position in MEC shares at 2025-09-30, 13,280,268 shares in all. 12 filers opened a position and 21 filers sold out during the quarter.

Managers
104
13F filers
104
New
12
Added
44
Reduced
29
Sold out
21
Shares held by filers
13,280,268

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
Allspring Global Investments Holdings, …in group Allspring Global Investments …2,411,103$32.9M0.05%-34,98713F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.914,839$12.6M<0.01%+1,65013F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC871,659$12M<0.01%-10,53613F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP847,123$11.7M<0.01%+33,08913F-HRTimelineGroup
ROYCE & ASSOCIATES LP566,717$7.8M0.08%+7,86813F-HRTimeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …521,100$7.17M0.1%-50,08713F-HRTimelineGroup
22NW, LP399,890$5.5M2.86%+244,44013F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC394,161$5.42M<0.01%+354,51413F-HRTimelineGroup
BLAIR WILLIAM & CO/IL377,210$5.19M0.01%+3,76213F-HRTimeline
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC364,794$5.02M<0.01%+57,81213F-HRTimelineGroup
First Eagle Investment Management, LLCin group First Eagle Investment Manage…354,575$4.88M0.01%+50013F-HRTimelineGroup
Granahan Investment Management, LLC349,267$4.81M0.2%-149,03813F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC334,873$4.61M<0.01%+16,55213F-HRTimelineGroup
JB CAPITAL PARTNERS LP250,512$4.46M0.76%013F-HRTimeline
STATE STREET CORPin group STATE STREET CORP274,936$3.78M<0.01%+9,88613F-HRTimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …268,635$3.7M<0.01%013F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC236,548$3.25M0.07%+13,89413F-HRTimeline
Ancora Advisors LLCin group Ancora Advisors LLC228,300$3.14M0.06%-131,48013F-HRTimelineGroup
Roubaix Capital, LLC212,688$2.93M1.36%+111,55013F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/208,975$2.88M<0.01%-18,72413F-HR/ATimelineGroup
Boston Partnersin group Boston Trust Walden Corp198,160$2.73M<0.01%new13F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…192,394$2.65M<0.01%-23,78513F-HRTimelineGroup
CenterBook Partners LP177,659$2.44M0.12%+82,57313F-HRTimeline
JACOBS LEVY EQUITY MANAGEMENT, INC170,335$2.34M0.01%+33,95213F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC155,000$2.13M<0.01%+11,00013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.121,786$1.78M<0.01%-9,80313F-HRTimelineGroup
Empowered Funds, LLC121,880$1.68M0.02%+13,89413F-HRTimeline
GLOBEFLEX CAPITAL L P116,468$1.6M0.25%013F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP109,230$1.5M<0.01%+7,49213F-HRTimelineGroup
UBS Group AGin group UBS Group AG105,754$1.46M<0.01%+18,22013F-HRTimelineGroup
ANCHOR CAPITAL ADVISORS LLC99,775$1.37M0.04%+2,13713F-HRTimeline
Wealthspire Advisors, LLC95,415$1.31M0.01%013F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC92,982$1.28M<0.01%+7,41113F-HRTimelineGroup
PANAGORA ASSET MANAGEMENT INC68,372$941K<0.01%+29,38513F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC59,540$819K<0.01%+34,16613F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO55,314$761K<0.01%+3,82413F-HRTimelineGroup
SummerHaven Investment Management, LLC51,725$712K0.41%new13F-HRTimeline
Nuveen, LLCin group TIAA49,337$679K<0.01%013F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp42,453$584K<0.01%+3,22513F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co39,131$538K<0.01%013F-HRTimelineGroup
SHEETS SMITH WEALTH MANAGEMENT38,975$536K0.06%+39013F-HRTimeline
Janney Montgomery Scott LLC36,665$505K<0.01%+16613F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC36,677$505K<0.01%-3,82513F-HR/ATimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD35,797$493K<0.01%+11,50013F-HRTimeline
MARTINGALE ASSET MANAGEMENT L P35,610$490K0.01%-7,90613F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY35,001$482K<0.01%-27,30113F-HR/ATimelineGroup
Perritt Capital Management Inc30,000$413K0.2%013F-HRTimeline
O'SHAUGHNESSY ASSET MANAGEMENT, LLC29,848$411K<0.01%-74613F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources27,778$382K<0.01%+11,91913F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC26,731$368K<0.01%+11,55013F-HRTimeline
Invesco Ltd.in group Invesco Ltd.26,191$360K<0.01%-3,23113F-HRTimelineGroup
ExodusPoint Capital Management, LP26,039$358K0.01%new13F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC25,187$347K<0.01%+74013F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC24,250$334K<0.01%-1,03013F-HRTimelineGroup
EntryPoint Capital, LLC24,098$332K0.13%+8,18413F-HRTimeline
Avior Wealth Management, LLC22,919$315K0.01%013F-HRTimeline
STRS OHIO22,300$307K<0.01%-8,80013F-HRTimeline
LPL Financial LLC21,377$294K<0.01%+53113F-HRTimeline
Gradient Investments LLCin group Gradient Investments LLC21,099$290K<0.01%-47013F-HRTimelineGroup
RHUMBLINE ADVISERS20,053$276K<0.01%+8413F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC19,025$262K<0.01%new13F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC18,730$258K<0.01%new13F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN16,723$230K<0.01%+2,47913F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…16,689$230K<0.01%+5,85513F-HRTimeline
Sterling Capital Management LLC16,371$225K<0.01%+55513F-HRTimeline
ALLIANCEBERNSTEIN L.P.13,190$181K<0.01%013F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…12,992$170K<0.01%+34013F-HRTimeline
State of Wyoming12,315$169K0.02%-42813F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA8,605$118K<0.01%-22,18813F-HRTimelineGroup
AlphaQuest LLC8,342$115K0.01%+1,73313F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…7,958$110K<0.01%013F-HRTimelineGroup
HARBOUR INVESTMENTS, INC.7,700$106K<0.01%013F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…6,668$91.8K<0.01%-1,12313F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO6,489$89.3K<0.01%-1,44713F-HR/ATimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND5,395$74.2K<0.01%013F-HRTimeline
Police & Firemen's Retirement System of…4,651$64K<0.01%+2,09413F-HRTimeline
FMR LLCin group FMR LLC3,267$45K<0.01%+12213F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS2,751$37.9K<0.01%+1,43513F-HRTimelineGroup
Arax Advisory Partners1,616$22.2K<0.01%new13F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,525$21K<0.01%-39213F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…1,454$20K<0.01%013F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP1,329$18K<0.01%+21513F-HRTimelineGroup
NEW YORK STATE TEACHERS RETIREMENT SYST…1,287$18K<0.01%+12613F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc1,260$17.3K<0.01%013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC1,224$16.8K<0.01%-4,51113F-HRTimelineGroup
Avion Wealth1,000$13K<0.01%013F-HRTimeline
CWM, LLCin group CWM, LLC936$13K<0.01%-25113F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…923$12.7K<0.01%+113F-HRTimeline
Clearstead Advisors, LLC710$9.77K<0.01%new13F-HRTimeline
COMERICA BANK398$5.47K<0.01%-11513F-HRTimeline
AMALGAMATED BANK372$5K<0.01%013F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…276$3.8K<0.01%new13F-HRTimelineGroup
Optiver Holding B.V.in group Optiver Holding B.V.236$3.25K<0.01%new13F-HRTimelineGroup
Advisory Services Network, LLC210$2.89K<0.01%new13F-HRTimeline
CIBC Private Wealth Group LLCin group CIBC Bancorp USA Inc.80$1.1K<0.01%new13F-HRTimelineGroup
GAMMA Investing LLC80$1.1K<0.01%-1113F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…66$908<0.01%-4913F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC59$812<0.01%-1713F-HRTimeline
Allworth Financial LP58$799<0.01%-113F-HRTimeline
Parkside Financial Bank & Trust35$482<0.01%013F-HRTimeline
Vermillion Wealth Management, Inc.30$413<0.01%013F-HRTimeline
Essential Partners LLC14$193<0.01%-413F-HRTimeline
True Wealth Design, LLC11$152<0.01%013F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…8$110<0.01%new13F-HRTimelineGroup