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Disclosery

MEC MAYVILLE ENGR CO INC

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COMMON STOCK (common), issuer CIK 1766368

150 managers (154 13F filers) reported a position in MEC shares at 2026-06-30, 21,176,699 shares in all. 52 filers opened a position and 20 filers sold out during the quarter.

Managers
150
13F filers
154
New
52
Added
44
Reduced
39
Sold out
20
Shares held by filers
21,176,699

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, Q2 2026

Filers in the available 13F reports with a share position at 2026-06-30, 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
Portolan Capital Management, LLCin group Portolan Capital Management, …1,299,256$48.7M1.82%+478,12013F-HRTimelineGroup
FMR LLCin group FMR LLC1,280,170$48M<0.01%+1,275,90913F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.1,183,443$44.3M<0.01%+301,58913F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …1,072,916$37.8M0.06%-927,43413F-HRTimelineGroup
VANGUARD GROUP INCgroup of 4 filers holding948,711$35.5M+180,890Timeline
Driehaus Capital Management LLC846,354$31.7M0.18%new13F-HRTimeline
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT…in group SUMMIT PARTNERS PUBLIC ASSET …800,000$30M0.78%new13F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP782,276$29.3M0.01%-143,94013F-HRTimelineGroup
ROYCE & ASSOCIATES LP752,083$28.2M0.23%+1,08213F-HRTimeline
Boston Partnersin group Boston Trust Walden Corp696,429$25.8M0.02%+463,79213F-HRTimelineGroup
Jupiter Topco LLCin group Janus Henderson575,278$21.5M0.01%13F-HRTimelineGroup
BLAIR WILLIAM & CO/IL546,714$20.5M0.05%-18,58613F-HRTimeline
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…477,583$17.9M<0.01%new13F-HRTimelineGroup
EVR Research LP441,908$16.6M8.17%-178,09213F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC374,578$14M<0.01%+38,74313F-HRTimelineGroup
First Eagle Investment Management, LLCin group First Eagle Investment Manage…369,575$13.8M0.02%-34,50013F-HR/ATimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC356,151$13.3M0.01%new13F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO347,224$13M<0.01%+341,74313F-HRTimelineGroup
KENNEDY CAPITAL MANAGEMENT LLC336,377$12.6M0.22%+229,58613F-HRTimeline
Ophir Asset Management Pty Ltd326,699$12.2M1.01%new13F-HRTimeline
Granahan Investment Management, LLC324,108$12.1M0.43%-63,36213F-HRTimeline
SILVERCREST ASSET MANAGEMENT GROUP LLC313,943$11.8M0.08%+44,26213F-HRTimeline
STATE STREET CORPin group STATE STREET CORP291,168$10.9M<0.01%+5,31813F-HRTimelineGroup
Nuveen, LLCin group TIAA281,914$10.6M<0.01%+234,49613F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/276,317$10.4M<0.01%+92,71813F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC253,677$9.5M0.01%-127,29513F-HRTimelineGroup
JB CAPITAL PARTNERS LP250,512$9.38M1.45%013F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC238,766$8.94M0.02%+128,19713F-HRTimelineGroup
CONGRUENCE CAPITAL, LLC235,580$8.82M2.31%+1,10513F-HRTimeline
BRIDGEWAY CAPITAL MANAGEMENT, LLC200,980$7.53M0.13%-21,72313F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP198,912$7.45M0.01%+164,20413F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC198,712$7.44M<0.01%+141,92613F-HRTimelineGroup
AWM Investment Company, Inc.180,000$6.74M0.59%new13F-HRTimeline
OSTERWEIS CAPITAL MANAGEMENT INCin group OSTERWEIS CAPITAL MANAGEMENT …174,600$6.54M0.31%new13F-HRTimelineGroup
TUDOR INVESTMENT CORP ET AL169,848$6.36M0.03%new13F-HRTimeline
LORD, ABBETT & CO. LLC152,175$5.7M0.02%new13F-HRTimeline
Wealthspire Advisors, LLC141,607$5.3M0.03%013F-HRTimeline
Pillsbury Lake Capital LLC136,746$5.12M1.41%new13F-HRTimeline
Informed Momentum Co LLC129,182$4.84M0.43%new13F-HRTimeline
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…125,513$4.7M<0.01%-12,70213F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO118,607$4.44M<0.01%-4,27113F-HRTimelineGroup
Empowered Funds, LLC116,570$4.37M0.02%-6,72313F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP114,995$4.31M<0.01%+14,61113F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS112,455$4.21M<0.01%+109,65713F-HRTimelineGroup
NEEDHAM INVESTMENT MANAGEMENT LLCin group NEEDHAM INVESTMENT MANAGEMENT…110,000$4.12M0.12%+90,00013F-HRTimelineGroup
HUNTER ASSOCIATES INVESTMENT MANAGEMENT…107,528$4.03M0.46%new13F-HRTimeline
Trexquant Investment LP100,517$3.77M0.02%new13F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY100,159$3.75M<0.01%+76,32513F-HRTimelineGroup
Walleye Capital LLCin group Walleye Capital LLC93,444$3.5M0.02%new13F-HRTimelineGroup
Qube Research & Technologies Ltd87,129$3.26M<0.01%new13F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…85,462$3.2M<0.01%new13F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding82,891$3.11M-33,909Timeline
ANCHOR CAPITAL ADVISORS LLC80,884$3.03M0.09%-55813F-HRTimeline
Invesco Ltd.in group Invesco Ltd.75,331$2.82M<0.01%+48,30313F-HRTimelineGroup
FORMULA GROWTH LTD75,000$2.81M0.99%-25,00013F-HRTimeline
TOCQUEVILLE ASSET MANAGEMENT L.P.in group TOCQUEVILLE ASSET MANAGEMENT …71,100$2.66M0.04%013F-HRTimelineGroup
Panoramic Capital, LLC70,000$2.62M1.13%-70,00013F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd65,604$2.46M0.03%+24,12613F-HRTimelineGroup
POLEN CAPITAL MANAGEMENT LLC61,827$2.32M0.02%new13F-HRTimeline
Essential Investment Partners LLC58,886$2.21M1.77%+19,24713F-HRTimeline
CITIGROUP INCin group CITIGROUP INC52,620$1.97M<0.01%+50,98313F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC51,990$1.95M<0.01%-12,91813F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC48,211$1.81M<0.01%-173,46213F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management47,052$1.76M<0.01%new13F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co45,861$1.72M<0.01%+5,76313F-HRTimelineGroup
SummerHaven Investment Management, LLC45,325$1.7M0.91%013F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp44,873$1.68M<0.01%+6,02213F-HRTimelineGroup
GatePass Capital, LLC40,000$1.5M0.57%new13F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.39,614$1.48M<0.01%-59,49013F-HRTimelineGroup
SHEETS SMITH WEALTH MANAGEMENT37,897$1.42M0.14%-1,07813F-HRTimeline
Diametric Capital, LP35,727$1.34M0.14%new13F-HRTimeline
Aquatic Capital Management LLC31,731$1.19M0.04%+22,83013F-HRTimeline
Janney Montgomery Scott LLC31,304$1.17M<0.01%-113F-HRTimeline
CenterBook Partners LP30,992$1.16M0.06%-89,31113F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC30,584$1.15M0.02%new13F-HRTimeline
North Star Investment Management Corp.30,000$1.12M0.06%013F-HRTimeline
KORNITZER CAPITAL MANAGEMENT INC /KS29,587$1.11M0.02%new13F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.28,625$1.07M0.07%+20,84013F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC28,000$1.05M<0.01%-34,90013F-HRTimeline
Divisadero Street Capital Management, LPin group Divisadero Street Capital Man…27,482$1.03M0.02%new13F-HRTimelineGroup
Quadrature Capital Ltdin group Quadrature Capital Ltd26,477$992K0.01%new13F-HRTimelineGroup
Johnson Financial Group, Inc.in group Johnson Financial Group, Inc.26,000$974K0.03%+9,52513F-HRTimelineGroup
PRELUDE CAPITAL MANAGEMENT, LLC23,969$898K0.07%new13F-HRTimeline
LPL Financial LLC22,172$831K<0.01%+40113F-HRTimeline
O'SHAUGHNESSY ASSET MANAGEMENT, LLC21,785$816K<0.01%-4,58513F-HRTimeline
HRT FINANCIAL LP21,568$807K<0.01%new13F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN20,300$760K<0.01%+7,73113F-HRTimelineGroup
RHUMBLINE ADVISERS20,001$749K<0.01%+1,80113F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC18,920$709K<0.01%-1,38113F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC18,224$683K<0.01%-2,15913F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD18,171$681K<0.01%-14,09113F-HRTimeline
WESBANCO BANK INC18,000$674K0.02%new13F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\14,278$535K<0.01%+4,04113F-HRTimelineGroup
Caption Management, LLC14,092$528K0.02%new13F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources12,816$480K<0.01%-71213F-HRTimelineGroup
WEALTH ENHANCEMENT ADVISORY SERVICES, L…13,946$470K<0.01%new13F-HRTimeline
Numerai GP LLC12,410$465K0.04%-27,34513F-HRTimeline
Creative Planningin group Creative Planning12,159$455K<0.01%new13F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/12,026$451K<0.01%new13F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\11,385$426K<0.01%+11,37413F-HRTimelineGroup
EntryPoint Capital, LLC10,793$404K0.1%new13F-HRTimeline
Worth Venture Partners, LLC10,641$399K0.9%-4,46913F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC10,197$382K<0.01%-8,83113F-HRTimelineGroup
Heck Capital Advisors, LLC10,072$377K0.02%-1,42213F-HRTimeline
DELTA CAPITAL MANAGEMENT LLC9,920$372K0.17%new13F-HRTimeline
Schonfeld Strategic Advisors LLC9,606$360K<0.01%new13F-HRTimeline
Centiva Capital, LP9,504$356K0.01%new13F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…8,648$324K<0.01%+69013F-HRTimelineGroup
HARBOUR INVESTMENTS, INC.7,700$288K<0.01%013F-HRTimeline
Avior Wealth Management, LLC7,519$282K0.01%-7,40013F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC7,490$281K<0.01%new13F-HRTimelineGroup
Quantbot Technologies LP7,027$263K0.01%new13F-HRTimeline
Connor, Clark & Lunn Investment Managem…6,918$259K<0.01%new13F-HRTimeline
Calamos Advisors LLCin group Calamos Advisors LLC6,883$258K<0.01%new13F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP6,814$255K0.02%new13F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…6,743$253K<0.01%+50213F-HRTimelineGroup
Engineers Gate Manager LP5,683$213K<0.01%new13F-HRTimeline
OCCUDO QUANTITATIVE STRATEGIES LP5,634$211K0.01%new13F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…5,581$209K<0.01%-6,44213F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND5,395$202K<0.01%013F-HRTimeline
Police & Firemen's Retirement System of…4,651$174K<0.01%013F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP4,560$169K<0.01%-1,62113F-HRTimelineGroup
State of Alaska, Department of Revenue3,903$146K<0.01%013F-HRTimeline
Persistent Asset Partners Ltd2,147$80.4K0.03%new13F-HRTimeline
SIMPLEX TRADING, LLC1,529$57.3K<0.01%new13F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc1,420$53.2K<0.01%+16013F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…1,329$49.8K<0.01%-12513F-HRTimelineGroup
Avion Wealth1,000$37K0.01%013F-HRTimeline
Caitong International Asset Management …943$35.3K<0.01%new13F-HRTimeline
Arax Advisory Partners709$26.6K<0.01%new13F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…636$23.8K<0.01%-64513F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA561$21K<0.01%-2,88613F-HRTimelineGroup
BARD ASSOCIATES INC500$18.7K<0.01%new13F-HRTimeline
Sterling Capital Management LLC295$11.1K<0.01%-10613F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…276$10.3K<0.01%013F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…184$6.89K<0.01%-52413F-HR/ATimeline
GAMMA Investing LLC174$6.52K<0.01%013F-HRTimeline
Clearstead Advisors, LLC131$4.91K<0.01%new13F-HRTimeline
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…118$4.41K<0.01%013F-HRTimelineGroup
Allworth Financial LP66$2.47K<0.01%+813F-HRTimeline
Farther Finance Advisors, LLC48$1.8K<0.01%+3413F-HRTimeline
Quarry LP44$1.65K<0.01%new13F-HRTimeline
Bare Financial Services, Inc37$1.39K<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…27$1.01K<0.01%+213F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC26$974<0.01%013F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…20$749<0.01%013F-HRTimelineGroup
Bruce G. Allen Investments, LLC18$674<0.01%new13F-HRTimeline
Essential Partners LLC14$524<0.01%013F-HRTimeline
SIGNATUREFD, LLC13$487<0.01%new13F-HRTimeline
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/4$149<0.01%new13F-HRTimelineGroup