Public ownership evidence

Mayville Engineering Company, Inc. (MEC) Ownership Disclosures

Read MEC insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Mayville Engineering Company, Inc.: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-08-08
Trade date
2026-08-06
Reporting owners
Leuba Sean P
Code
S
Shares
12,855
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0000897069-26-001598
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read MEC fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read MEC fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity

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2026-08-082026-08-06Leuba Sean PS12,855Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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First Eagle Investment Management, LLC2026-06-302026-08-25369,575$13,844,280None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25184$6,893None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-256,893$184,000None
Empowered Funds, LLC2026-06-302026-08-18116,570$4,366,712None
FORMULA GROWTH LTD2026-06-302026-08-1875,000$2,809,500None
SEI INVESTMENTS CO2026-06-302026-08-15118,563$4,441,370None
SEI INVESTMENTS CO2026-06-302026-08-1544$1,650None
Quarry LP2026-06-302026-08-1544$1,648None
Panoramic Capital, LLC2026-06-302026-08-1570,000$2,622,200None
Divisadero Street Capital Management, LP2026-06-302026-08-1527,482$1,029,476None
Ophir Asset Management Pty Ltd2026-06-302026-08-15326,699$12,238,145None
XTX Topco Ltd2026-06-302026-08-1565,604$2,457,526None
Aquatic Capital Management LLC2026-06-302026-08-1531,731$1,188,643None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-1545,861$1,717,953None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-1545,861$1,717,953None
Qube Research & Technologies Ltd2026-06-302026-08-1587,129$3,263,852None
Diametric Capital, LP2026-06-302026-08-1535,727$1,338,333None
Caption Management, LLC2026-06-302026-08-1537,500$1,404,750Put
Caption Management, LLC2026-06-302026-08-1562,500$2,341,250Call
Caption Management, LLC2026-06-302026-08-1514,092$527,886None
OSAIC HOLDINGS, INC.2026-06-302026-08-1539,614$1,483,911None
Schonfeld Strategic Advisors LLC2026-06-302026-08-159,606$359,839None
Squarepoint Ops LLC2026-06-302026-08-15238,766$8,944,174None
Trexquant Investment LP2026-06-302026-08-15100,517$3,765,367None
MetLife Investment Management, LLC2026-06-302026-08-158,648$323,954None
Engineers Gate Manager LP2026-06-302026-08-155,683$212,885None
JANE STREET GROUP, LLC2026-06-302026-08-1545,917$1,720,051None
JANE STREET GROUP, LLC2026-06-302026-08-15310,234$11,621,366None
JANE STREET GROUP, LLC2026-06-302026-08-1520,100$752,946Put
JANE STREET GROUP, LLC2026-06-302026-08-1527,100$1,015,166Call
BOOTHBAY FUND MANAGEMENT, LLC2026-06-302026-08-1530,584$1,145,677None
AWM Investment Company, Inc.2026-06-302026-08-15180,000$6,742,800None
Legal & General Group Plc2026-06-302026-08-151,420$53,193None
HRT FINANCIAL LP2026-06-302026-08-1521,568$807,000None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15149,800$5,611,508Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15126,200$4,727,452Put
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1585,462$3,201,407None
Pillsbury Lake Capital LLC2026-06-302026-08-15136,746$5,122,505None
J. Goldman & Co LP2026-06-302026-08-1530,000$1,123,800Call
Granahan Investment Management, LLC2026-06-302026-08-15324,108$12,141,086None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-15253,677$9,502,740None
Numerai GP LLC2026-06-302026-08-1512,410$464,879None
SILVERCREST ASSET MANAGEMENT GROUP LLC2026-06-302026-08-15313,943$11,760,305None
Balyasny Asset Management L.P.2026-06-302026-08-1547,052$1,762,568None
JONES FINANCIAL COMPANIES LLLP2026-06-302026-08-154,560$168,720None
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC2026-06-302026-08-15800,000$29,968,000None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-15434$16,258None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-1516,946$634,797None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-15710$26,597None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-15129$4,832None

90-day public filing window, up to 50 source positions.

First Eagle Investment Management, LLC ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗Empowered Funds, LLC ↗FORMULA GROWTH LTD ↗SEI INVESTMENTS CO ↗SEI INVESTMENTS CO ↗Quarry LP ↗Panoramic Capital, LLC ↗Divisadero Street Capital Management, LP ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

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