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	$57.3K	Buy	+1,529	New	+$40.9K	﹤0.01%	6170
2024 Q1	–	Sell	-1,016	Closed	-$13.3K	–	9434
2023 Q4	$14K	Sell	1,016 -678	-40%	-$8.41K	﹤0.01%	7189
2023 Q3	$18K	Buy	+1,694	New	+$19.6K	﹤0.01%	6711
2023 Q2	–	Sell	-3,045	Closed	-$38.5K	–	9542
2023 Q1	$45K	Sell	3,045 -2,214	-42%	-$32.3K	﹤0.01%	6039
2022 Q4	$66K	Buy	+5,259	New	+$52.5K	﹤0.01%	5538

Other funds holding MEC

PCM

Portolan Capital Management Boston, Massachusetts $2.67B AUM 169.09% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

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 Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Royce & Associates New York $12.4B AUM 64.17% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

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.