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
2026
Q2 		$22.5K Sell
600
-700
-54% -$18.7K ﹤0.01% 7007
2026
Q1 		$23.3K Buy
1,300
+900
+225% +$17.3K ﹤0.01% 6647
2025
Q4 		$7.49K Buy
+400
New +$6.52K ﹤0.01% 7173
2025
Q3 		– Sell
-100
Closed -$1K – 9630
2025
Q2 		$1K Buy
+100
New +$1.43K ﹤0.01% 8363
2025
Q1 		– Sell
-1,800
Closed -$28K – 9196
2024
Q4 		$28K Buy
+1,800
New +$32.9K ﹤0.01% 6421
2024
Q3 		– Sell
-2,800
Closed -$46K – 9126
2024
Q2 		$46K Buy
2,800
+100
+4% +$1.51K ﹤0.01% 6175
2024
Q1 		$38K Buy
2,700
+2,200
+440% +$28.7K ﹤0.01% 6521
2023
Q4 		$7K Buy
+500
New +$6.21K ﹤0.01% 7674
2023
Q3 		– Sell
-7,100
Closed -$88K – 9355
2023
Q2 		$88K Hold
7,100
– – ﹤0.01% 5241
2023
Q1 		$105K Buy
+7,100
New +$103K ﹤0.01% 5099

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.