Simplex Trading
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Simplex Trading’s Mayville Engineering Co MEC Stock Holding History

Simplex Trading’s Portfolio MEC Stock Details MEC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2023
Q4 		– Sell
-3,600
Closed -$39K – 9409
2023
Q3 		$39K Hold
3,600
– – ﹤0.01% 6027
2023
Q2 		$44K Buy
+3,600
New +$45.5K ﹤0.01% 5964
2023
Q1 		– Sell
-200
Closed -$2K – 9705
2022
Q4 		$2K Buy
+200
New +$2K ﹤0.01% 8605

Other funds holding MEC

PCM
Portolan Capital Management Boston, Massachusetts $2.67B AUM 169.09% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Allspring Global Investments
Allspring Global Investments Charlotte, North Carolina $65.2B AUM 39.42% 1-Year Est. Return
DCM
Driehaus Capital Management Chicago, Illinois $17.3B AUM 211.34% 1-Year Est. Return
SPPAM
Summit Partners Public Asset Management Boston, Massachusetts $5.69B AUM 259.25% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
RA
Royce & Associates New York $12.4B AUM 64.17% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return

Simplex Trading's MEC Position: Q2 2026 in Review

Simplex Trading opened a new position in Mayville Engineering Co (MEC) in Q2 2026: 1,529 shares worth $57.3K. The stake represents ﹤0.01% of the portfolio and ranks #6170 among its holdings. This is a return to the name: Simplex Trading previously reported a position in MEC as recently as Q4 2023.

Simplex Trading first reported a position in MEC in Q4 2022 and has held it in 5 quarters since. The position peaked at $66K in Q4 2022. 155 funds tracked by Wall St. Rank hold MEC as of Q2 2026.

  • Simplex Trading held 1,529 shares of Mayville Engineering Co worth $57.3K as of Q2 2026.
  • Mayville Engineering Co was a new Simplex Trading position in Q2 2026.
  • Mayville Engineering Co made up ﹤0.01% of Simplex Trading's portfolio in Q2 2026, its #6170 holding.
  • Simplex Trading first reported a position in Mayville Engineering Co in Q4 2022 and has held it in 5 quarters since.
  • Simplex Trading's Mayville Engineering Co position peaked at $66K in Q4 2022.
  • 155 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q2 2026.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.