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Disclosery

MEC MAYVILLE ENGR CO INC

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COMMON STOCK (common), issuer CIK 1766368

120 managers (124 13F filers) reported a position in MEC shares at 2026-03-31, 14,401,113 shares in all. 20 filers opened a position and 20 filers sold out during the quarter.

Managers
120
13F filers
124
New
20
Added
38
Reduced
39
Sold out
20
Shares held by filers
14,401,113

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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 …2,000,350$35.8M0.06%-52,26313F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP926,216$16.6M<0.01%+49,04113F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.881,854$15.8M<0.01%+16,23513F-HRTimelineGroup
Portolan Capital Management, LLCin group Portolan Capital Management, …821,136$14.7M0.78%+308,37413F-HRTimelineGroup
VANGUARD GROUP INCgroup of 4 filers holding767,821$13.8MnewTimeline
ROYCE & ASSOCIATES LP751,001$13.5M0.13%+126,69413F-HRTimeline
EVR Research LP620,000$11.1M6.34%+15,00013F-HRTimeline
BLAIR WILLIAM & CO/IL565,300$10.1M0.03%-18,45913F-HRTimeline
First Eagle Investment Management, LLCin group First Eagle Investment Manage…404,075$7.25M0.01%+46,00013F-HR/ATimelineGroup
Granahan Investment Management, LLC387,470$6.96M0.34%+119,70813F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC380,972$6.84M0.01%+227,77213F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC351,790$6.31M<0.01%+94613F-HR/ATimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC335,835$6.03M<0.01%+6,91413F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP285,850$5.13M<0.01%+85013F-HRTimelineGroup
SILVERCREST ASSET MANAGEMENT GROUP LLC269,681$4.84M0.03%+89,74013F-HRTimeline
JB CAPITAL PARTNERS LP250,512$4.5M0.77%013F-HRTimeline
CONGRUENCE CAPITAL, LLC234,475$4.21M1.41%+26,37313F-HRTimeline
Boston Partnersin group Boston Trust Walden Corp232,637$4.18M<0.01%+9,90713F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC222,703$4M0.08%-4,22313F-HRTimeline
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC221,673$3.98M<0.01%-59,16713F-HRTimelineGroup
Roubaix Capital, LLC210,657$3.78M1.76%+64,36013F-HRTimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …185,261$3.33M<0.01%-103,18913F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/183,599$3.3M<0.01%-35,28913F-HRTimelineGroup
Wealthspire Advisors, LLC141,607$2.54M0.02%+46,19213F-HRTimeline
Panoramic Capital, LLC140,000$2.51M1.76%new13F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…138,215$2.48M<0.01%-51,76613F-HRTimelineGroup
Empowered Funds, LLC123,293$2.21M0.01%new13F-HR/ATimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO122,878$2.21M<0.01%+39,30913F-HRTimelineGroup
CenterBook Partners LP120,303$2.16M0.12%-135,48813F-HRTimeline
UBS Group AGgroup of 2 filers holding116,800$2.1M-29,799Timeline
Squarepoint Ops LLCin group Squarepoint Ops LLC110,569$1.98M<0.01%new13F-HRTimelineGroup
KENNEDY CAPITAL MANAGEMENT LLC106,791$1.92M0.04%+2,44613F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP100,384$1.8M<0.01%+6,01613F-HRTimelineGroup
FORMULA GROWTH LTD100,000$1.79M0.81%+60,00013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.99,104$1.78M<0.01%-20,97413F-HRTimelineGroup
ANCHOR CAPITAL ADVISORS LLC81,442$1.46M0.04%-26,87613F-HRTimeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …71,100$1.28M0.02%013F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC64,908$1.17M<0.01%-24,83913F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC62,900$1.13M<0.01%-8,30013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC56,786$1.02M<0.01%-46,67713F-HRTimelineGroup
Integrated Quantitative Investments LLC50,659$909K0.16%new13F-HRTimeline
Nuveen, LLCin group TIAA47,418$851K<0.01%-40,16913F-HRTimelineGroup
SummerHaven Investment Management, LLC45,325$814K0.5%-6,40013F-HRTimeline
HighTower Advisors, LLC44,587$800K<0.01%new13F-HRTimeline
JOURNEY STRATEGIC WEALTH LLC44,206$793K0.02%+15,02113F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd41,478$745K0.01%+20,14413F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co40,098$720K<0.01%-3,35713F-HRTimelineGroup
Numerai GP LLC39,755$714K0.07%new13F-HRTimeline
Essential Investment Partners LLC39,639$712K0.66%+5,37013F-HRTimeline
SHEETS SMITH WEALTH MANAGEMENT38,975$700K0.08%013F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp38,851$697K<0.01%-3,43813F-HRTimelineGroup
PANAGORA ASSET MANAGEMENT INC36,765$660K<0.01%-17,82913F-HRTimeline
Legato Capital Management LLC35,698$641K0.06%new13F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP34,708$623K<0.01%new13F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD32,262$579K<0.01%-8,43513F-HRTimeline
Ancora Advisors LLCin group Ancora Advisors LLC32,133$577K0.01%-93,89713F-HRTimelineGroup
Janney Montgomery Scott LLC31,305$562K<0.01%-2,84513F-HRTimeline
North Star Investment Management Corp.30,000$538K0.03%new13F-HRTimeline
Invesco Ltd.in group Invesco Ltd.27,028$485K<0.01%-84213F-HRTimelineGroup
O'SHAUGHNESSY ASSET MANAGEMENT, LLC26,370$473K<0.01%-77413F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY23,834$428K<0.01%-58,55613F-HRTimelineGroup
LPL Financial LLC21,771$391K<0.01%-1713F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC20,383$366K<0.01%-11,52513F-HRTimelineGroup
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC20,301$364K<0.01%-3,05713F-HRTimelineGroup
NEEDHAM INVESTMENT MANAGEMENT LLCin group NEEDHAM INVESTMENT MANAGEMENT…20,000$359K0.02%new13F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC19,028$342K<0.01%-17,99713F-HRTimelineGroup
SummitTX Capital, L.P.18,696$336K0.01%+3,57813F-HRTimeline
RHUMBLINE ADVISERS18,200$327K<0.01%+16813F-HRTimeline
Gradient Investments LLCin group Gradient Investments LLC17,104$307K<0.01%-3,80013F-HRTimelineGroup
Johnson Financial Group, Inc.in group Johnson Financial Group, Inc.16,475$296K0.01%013F-HRTimelineGroup
Worth Venture Partners, LLC15,110$271K0.86%+1,37513F-HRTimeline
Avior Wealth Management, LLC14,919$268K0.01%013F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources13,528$243K<0.01%+7013F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.12,810$240K<0.01%013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN12,569$226K<0.01%-9,92213F-HR/ATimelineGroup
MIRABELLA FINANCIAL SERVICES LLP12,430$223K0.02%new13F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…12,023$216K<0.01%new13F-HRTimelineGroup
Heck Capital Advisors, LLC11,494$206K0.02%new13F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\10,237$184K<0.01%+1,98813F-HRTimelineGroup
Aquatic Capital Management LLC8,901$160K<0.01%+4,51813F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…7,958$143K<0.01%013F-HRTimelineGroup
HARBOR CAPITAL ADVISORS, INC.7,785$140K0.01%new13F-HRTimeline
HARBOUR INVESTMENTS, INC.7,700$138K<0.01%013F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…6,241$112K<0.01%+13613F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP6,181$109K<0.01%+3,25213F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND5,395$96.8K<0.01%013F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO5,481$95.8K<0.01%-7213F-HR/ATimelineGroup
Police & Firemen's Retirement System of…4,651$83.5K<0.01%013F-HRTimeline
FMR LLCin group FMR LLC4,261$76.5K<0.01%+93213F-HRTimelineGroup
State of Alaska, Department of Revenue3,903$70K<0.01%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA3,447$62K<0.01%-33713F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS2,798$50.2K<0.01%-15713F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC1,637$29.4K<0.01%+24613F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…1,454$26.1K<0.01%013F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,281$23K<0.01%+19113F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc1,260$22.6K<0.01%013F-HRTimelineGroup
Avion Wealth1,000$17K<0.01%013F-HRTimeline
CWM, LLCin group CWM, LLC922$16.6K<0.01%+2113F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…708$12.7K<0.01%-9713F-HRTimeline
MAI Capital Management414$7.43K<0.01%+27313F-HRTimeline
Sterling Capital Management LLC401$7.2K<0.01%-15,77013F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…276$4.95K<0.01%-30713F-HRTimelineGroup
GAMMA Investing LLC174$3.12K<0.01%013F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.124$2.23K<0.01%-11213F-HR/ATimelineGroup
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…118$2.11K<0.01%new13F-HRTimelineGroup
Advisory Services Network, LLC115$2.06K<0.01%new13F-HRTimeline
Annis Gardner Whiting Capital Advisors,…80$1.44K<0.01%new13F-HRTimeline
Allworth Financial LP58$1.04K<0.01%013F-HRTimeline
BAYBAN43$772<0.01%new13F-HRTimeline
Bare Financial Services, Inc37$664<0.01%013F-HRTimeline
Parkside Financial Bank & Trust35$629<0.01%013F-HRTimeline
Vermillion Wealth Management, Inc.30$539<0.01%013F-HRTimeline
NISA INVESTMENT ADVISORS, LLC26$467<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…25$449<0.01%013F-HR/ATimelineGroup
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…20$359<0.01%+713F-HRTimelineGroup
Farther Finance Advisors, LLC14$251<0.01%new13F-HRTimeline
Essential Partners LLC14$251<0.01%013F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\11$197<0.01%-27413F-HRTimelineGroup
True Wealth Design, LLC9$162<0.01%013F-HRTimeline
Root Financial Partners, LLC5$90<0.01%new13F-HRTimeline