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Disclosery

MEC MAYVILLE ENGR CO INC

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COMMON STOCK (common), issuer CIK 1766368

122 managers (123 13F filers) reported a position in MEC shares at 2025-12-31, 13,883,541 shares in all. 27 filers opened a position and 11 filers sold out during the quarter.

Managers
122
13F filers
123
New
27
Added
34
Reduced
42
Sold out
11
Shares held by filers
13,883,541

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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 …2,052,613$38.9M0.06%-358,49013F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP877,175$16.4M<0.01%+30,05213F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.865,619$16.2M<0.01%-49,22013F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC627,655$11.7M<0.01%-244,00413F-HRTimelineGroup
ROYCE & ASSOCIATES LP624,307$11.7M0.12%+57,59013F-HRTimeline
EVR Research LP605,000$11.3M6.11%new13F-HRTimeline
BLAIR WILLIAM & CO/IL583,759$10.9M0.03%+206,54913F-HRTimeline
Portolan Capital Management, LLCin group Portolan Capital Management, …512,762$9.6M0.51%new13F-HRTimelineGroup
22NW, LP414,280$7.76M3.61%+14,39013F-HRTimeline
First Eagle Investment Management, LLCin group First Eagle Investment Manage…358,075$6.7M0.01%+3,50013F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC350,844$6.57M<0.01%-43,31713F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC328,921$6.16M<0.01%-5,95213F-HRTimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …288,450$5.4M<0.01%+19,81513F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP285,000$5.34M<0.01%+10,06413F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC280,840$5.26M<0.01%-83,95413F-HRTimelineGroup
Granahan Investment Management, LLC267,762$5.01M0.21%-81,50513F-HRTimeline
CenterBook Partners LP255,791$4.79M0.23%+78,13213F-HRTimeline
JB CAPITAL PARTNERS LP250,512$4.69M0.81%013F-HRTimeline
BRIDGEWAY CAPITAL MANAGEMENT, LLC226,926$4.25M0.09%-9,62213F-HRTimeline
Boston Partnersin group Boston Trust Walden Corp222,730$4.17M<0.01%+24,57013F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/218,888$4.1M<0.01%+9,91313F-HRTimelineGroup
CONGRUENCE CAPITAL, LLC208,102$3.9M1.43%13F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…189,981$3.56M<0.01%-2,41313F-HRTimelineGroup
SILVERCREST ASSET MANAGEMENT GROUP LLC179,941$3.37M0.02%new13F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC153,200$2.87M<0.01%new13F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding146,599$2.74M+40,845Timeline
Roubaix Capital, LLC146,297$2.74M1.17%-66,39113F-HRTimeline
Ancora Advisors LLCin group Ancora Advisors LLC126,030$2.36M0.05%-102,27013F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.120,078$2.25M<0.01%-1,70813F-HRTimelineGroup
ANCHOR CAPITAL ADVISORS LLC108,318$2.03M0.06%+8,54313F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC104,345$1.95M0.04%new13F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC103,463$1.94M<0.01%new13F-HRTimelineGroup
Wealthspire Advisors, LLC95,415$1.79M0.01%013F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP94,368$1.77M<0.01%-14,86213F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC89,747$1.68M<0.01%-3,23513F-HR/ATimelineGroup
Nuveen, LLCin group TIAA87,587$1.64M<0.01%+38,25013F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO83,569$1.56M<0.01%+28,25513F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY82,390$1.54M<0.01%+47,38913F-HR/ATimelineGroup
RENAISSANCE TECHNOLOGIES LLC71,200$1.33M<0.01%-83,80013F-HRTimeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …71,100$1.33M0.02%-450,00013F-HRTimelineGroup
PANAGORA ASSET MANAGEMENT INC54,594$1.02M<0.01%-13,77813F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC53,074$994K<0.01%+34,34413F-HRTimelineGroup
SummerHaven Investment Management, LLC51,725$968K0.55%013F-HRTimeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co43,455$813K<0.01%+4,32413F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp42,289$792K<0.01%-16413F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD40,697$762K<0.01%+4,90013F-HRTimeline
FORMULA GROWTH LTD40,000$749K0.29%new13F-HRTimeline
SHEETS SMITH WEALTH MANAGEMENT38,975$730K0.08%013F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC38,672$724K<0.01%+13,48513F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC37,025$693K<0.01%+34813F-HRTimelineGroup
Essential Investment Partners LLC34,269$642K0.6%13F-HRTimeline
Janney Montgomery Scott LLC34,150$639K<0.01%-2,51513F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC31,908$597K<0.01%-27,63213F-HRTimelineGroup
JACOBS LEVY EQUITY MANAGEMENT, INC31,868$597K<0.01%-138,46713F-HRTimeline
Perritt Capital Management Inc30,000$562K0.94%013F-HRTimeline
Rothschild Wealth LLC30,000$562K0.05%new13F-HR/ATimeline
JOURNEY STRATEGIC WEALTH LLC29,185$546K0.01%new13F-HRTimeline
Invesco Ltd.in group Invesco Ltd.27,870$522K<0.01%+1,67913F-HRTimelineGroup
O'SHAUGHNESSY ASSET MANAGEMENT, LLC27,144$508K<0.01%-2,70413F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC23,358$437K<0.01%-89213F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN22,491$421K<0.01%+5,76813F-HRTimelineGroup
LPL Financial LLC21,788$408K<0.01%+41113F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd21,334$399K0.01%new13F-HRTimelineGroup
Gradient Investments LLCin group Gradient Investments LLC20,904$391K0.01%-19513F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.19,416$363K<0.01%new13F-HRTimelineGroup
RHUMBLINE ADVISERS18,032$338K<0.01%-2,02113F-HRTimeline
Johnson Financial Group, Inc.in group Johnson Financial Group, Inc.16,475$308K0.01%new13F-HRTimelineGroup
Sterling Capital Management LLC16,171$303K<0.01%-20013F-HRTimeline
SummitTX Capital, L.P.15,118$283K0.01%new13F-HRTimeline
Avior Wealth Management, LLC14,919$279K0.01%-8,00013F-HRTimeline
Worth Venture Partners, LLC13,735$257K1.86%new13F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources13,458$252K<0.01%-14,32013F-HRTimelineGroup
WEALTH ENHANCEMENT ADVISORY SERVICES, L…13,792$245K<0.01%+80013F-HRTimeline
HRT FINANCIAL LP12,933$242K<0.01%new13F-HRTimeline
ALLIANCEBERNSTEIN L.P.12,810$240K<0.01%-38013F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC12,160$228K0.01%new13F-HRTimeline
ExodusPoint Capital Management, LP11,316$212K<0.01%-14,72313F-HRTimeline
AlphaQuest LLC10,954$205K0.01%+2,61213F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\8,249$154K<0.01%new13F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…7,958$149K<0.01%013F-HRTimelineGroup
Quantbot Technologies LP7,827$147K<0.01%new13F-HRTimeline
HARBOUR INVESTMENTS, INC.7,700$144K<0.01%013F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…6,105$114K<0.01%-56313F-HRTimelineGroup
PICTON MAHONEY ASSET MANAGEMENT5,800$109K<0.01%new13F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO5,553$104K<0.01%-93613F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND5,395$101K<0.01%013F-HRTimeline
Police & Firemen's Retirement System of…4,651$87.1K<0.01%013F-HRTimeline
Aquatic Capital Management LLC4,383$82K<0.01%new13F-HRTimeline
State of Alaska, Department of Revenue3,903$73K<0.01%new13F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA3,784$70K<0.01%-4,82113F-HRTimelineGroup
FMR LLCin group FMR LLC3,329$62.3K<0.01%+6213F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS2,955$55.3K<0.01%+20413F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP2,929$54.8K<0.01%+1,60013F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…2,189$41K<0.01%-14,50013F-HRTimeline
Clearstead Advisors, LLC2,094$39.2K<0.01%+1,38413F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…1,454$27.2K<0.01%013F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC1,391$26K<0.01%+16713F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc1,260$23.6K<0.01%013F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…1,090$20.4K<0.01%-43513F-HRTimelineGroup
Avion Wealth1,000$18K<0.01%013F-HRTimeline
CWM, LLCin group CWM, LLC901$17K<0.01%-3513F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…805$15.1K<0.01%-11813F-HRTimeline
Quarry LP659$12.3K<0.01%new13F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…583$10.9K<0.01%+30713F-HR/ATimelineGroup
AMALGAMATED BANK411$8K<0.01%+3913F-HRTimeline
COMERICA BANK358$6.7K<0.01%-4013F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\285$5.33K<0.01%new13F-HRTimelineGroup
Optiver Holding B.V.in group Optiver Holding B.V.236$4.42K<0.01%013F-HRTimelineGroup
GAMMA Investing LLC174$3.26K<0.01%+9413F-HRTimeline
MAI Capital Management141$2.64K<0.01%new13F-HRTimeline
Allworth Financial LP58$1.09K<0.01%013F-HRTimeline
Bare Financial Services, Inc37$693<0.01%new13F-HRTimeline
Parkside Financial Bank & Trust35$656<0.01%013F-HRTimeline
Vermillion Wealth Management, Inc.30$562<0.01%013F-HRTimeline
NISA INVESTMENT ADVISORS, LLC26$487<0.01%-3313F-HRTimeline
Torren Management, LLC26$487<0.01%13F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…25$468<0.01%-4113F-HRTimelineGroup
Essential Partners LLC14$262<0.01%013F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…13$243<0.01%+513F-HRTimelineGroup
True Wealth Design, LLC9$169<0.01%-213F-HRTimeline
Arax Advisory Partners2$37<0.01%-1,61413F-HRTimeline
Covestor Ltd11$00%new13F-HRTimelineValue filed as zero, left out of ratios.