MEC Mayville Engineering Company, Inc.

NYSE
$18.09

Mayville Engineering Company, Inc. (MEC) Hedge Fund Activity

This view isolates hedge funds from the broader institutional ownership shown on the Institutional tab. A pension fund tracking an index may have no view on a stock; when a hedge fund builds or exits a position, that decision can carry information. This page measures those changes. Positions as of June 30, 2026.

Based on quarterly 13F long-equity filings. Changes compare reported quarter-end positions; filings can be reported up to 45 days later and do not represent a fund's complete exposure.

Hedge fund breadth
+56.52
18 buyers / 5 sellers
STRONG BUYING
Funds compared
23
funds with comparable MEC positions
23 current holders · 10 prior-quarter holders
Net share change
+1.30M
+1.56M added, -260.1K cut
Position activity
13 new 5 increased 5 reduced 0 exited

Most significant moves

Ranked by conviction, not size — how much of the fund's own book the position represents, how far it moved, and what kind of fund made it.

Fund Action Shares changed Change Est. value Portfolio wt. Score
Balyasny Asset Management L.P. New +47.1K — $1.8M 0.0% 59
Qube Research & Technologies Ltd Quant New +87.1K — $3.3M 0.0% 57
Divisadero Street Capital Management Long/Short New +27.5K — $1.0M 0.0% 56
Tudor Investment Corporation Macro New +169.8K — $6.4M 0.0% 56
CITADEL ADVISORS LLC Quant Increased +141.9K +249.9% $5.3M 0.0% 54
Walleye Capital Long/Short Quant New +93.4K — $3.5M 0.0% 53
Trexquant Investment Quant New +100.5K — $3.8M 0.0% 53
TWO SIGMA INVESTMENTS, LP Quant Increased +164.2K +473.1% $6.2M 0.0% 53
Quadrature Capital Quant New +26.5K — $991.8K 0.0% 53
Schonfeld Strategic Advisors Long/Short Quant New +9.6K — $359.8K 0.0% 51

Most significant buyers

By move score, not size.

  • Balyasny Asset Management L.P. New · +47.1K
  • Qube Research & Technologies Ltd New · +87.1K
  • Divisadero Street Capital Management New · +27.5K
  • Tudor Investment Corporation New · +169.8K
  • CITADEL ADVISORS LLC Increased · +141.9K

Most significant sellers

By move score, not size.

  • RENAISSANCE TECHNOLOGIES LLC Reduced · -34.9K
  • CenterBook Partners Reduced · -89.3K
  • MILLENNIUM MANAGEMENT LLC Reduced · -127.3K
  • Brevan Howard Capital Management Reduced · -6.4K
  • AQR Capital Management Reduced · -2.2K

Hedge fund positions

Fund Tier Shares Previous Change Change % Portfolio wt. Action Score
Balyasny Asset Management L.P. 2 47.1K 0 +47.1K — 0.0% New 59
Qube Research & Technologies Ltd 2 87.1K 0 +87.1K — 0.0% New 57
Divisadero Street Capital Management 2 27.5K 0 +27.5K — 0.0% New 56
Tudor Investment Corporation 2 169.8K 0 +169.8K — 0.0% New 56
CITADEL ADVISORS LLC 1 198.7K 56.8K +141.9K +249.9% 0.0% Increased 54
Walleye Capital 3 93.4K 0 +93.4K — 0.0% New 53
Trexquant Investment 3 100.5K 0 +100.5K — 0.0% New 53
TWO SIGMA INVESTMENTS, LP 2 198.9K 34.7K +164.2K +473.1% 0.0% Increased 53
Quadrature Capital 3 26.5K 0 +26.5K — 0.0% New 53
Schonfeld Strategic Advisors 3 9.6K 0 +9.6K — 0.0% New 51
Boothbay Fund Management 4 30.6K 0 +30.6K — 0.0% New 51
Squarepoint Ops LLC 2 238.8K 110.6K +128.2K +115.9% 0.0% Increased 51
Caption Management 3 14.1K 0 +14.1K — 0.0% New 50
Portolan Capital Management 3 1.3M 821.1K +478.1K +58.2% 1.8% Increased 49
Centiva Capital 4 9.5K 0 +9.5K — 0.0% New 48
Engineers Gate 4 5.7K 0 +5.7K — 0.0% New 48
Quantbot Technologies 4 7.0K 0 +7.0K — 0.0% New 45
RENAISSANCE TECHNOLOGIES LLC 1 28.0K 62.9K -34.9K -55.5% 0.0% Reduced 43
Aquatic Capital Management 4 31.7K 8.9K +22.8K +256.5% 0.0% Increased 42
CenterBook Partners 4 31.0K 120.3K -89.3K -74.2% 0.1% Reduced 39
MILLENNIUM MANAGEMENT LLC 2 253.7K 381.0K -127.3K -33.4% 0.0% Reduced 37
Brevan Howard Capital Management 3 5.6K 12.0K -6.4K -53.6% 0.0% Reduced 32
AQR Capital Management 3 18.2K 20.4K -2.2K -10.6% 0.0% Reduced 22

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Hedge funds are identified from their 13F filings, which are due 45 days after quarter end and cover long U.S.-listed equity positions only. A fund's short book never appears, so a reduced position can mean a changed view or a changed hedge — the filing doesn't say which.