Jeff Yass’s Mayville Engineering Co MEC Stock Holding History

Jeff Yass’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	$3.2M	Buy	+85,462	New	+$2.28M	﹤0.01%	5496
2025 Q3	–	Sell	-28,186	Closed	-$450K	–	13288
2025 Q2	$450K	Buy	28,186 +4,449	+19%	+$63.6K	﹤0.01%	9422
2025 Q1	$319K	Buy	23,737 +6,138	+35%	+$92.3K	﹤0.01%	9932
2024 Q4	$277K	Buy	+17,599	New	+$322K	﹤0.01%	10010
2024 Q3	–	Sell	-14,032	Closed	-$234K	–	12603
2024 Q2	$234K	Buy	+14,032	New	+$212K	﹤0.01%	10018
2023 Q4	–	Sell	-12,129	Closed	-$151K	–	12914
2023 Q3	$133K	Buy	+12,129	New	+$140K	﹤0.01%	10675
2023 Q2	–	Sell	-61,811	Closed	-$781K	–	12714
2023 Q1	$922K	Buy	61,811 +13,921	+29%	+$203K	﹤0.01%	7027
2022 Q4	$606K	Buy	+47,890	New	+$478K	﹤0.01%	7364
2019 Q3	–	Sell	-16,852	Closed	-$233K	–	10566
2019 Q2	$233K	Buy	+16,852	New	+$260K	﹤0.01%	8827

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

Jeff Yass's MEC Position: Q2 2026 in Review

Jeff Yass opened a new position in Mayville Engineering Co (MEC) in Q2 2026: 85,462 shares worth $3.2M. The stake represents ﹤0.01% of the portfolio and ranks #5496 among its holdings. This is a return to the name: Jeff Yass previously reported a position in MEC as recently as Q2 2025.

Jeff Yass first reported a position in MEC in Q2 2019 and has held it in 9 quarters since. 154 funds tracked by Wall St. Rank hold MEC as of Q2 2026.

Jeff Yass held 85,462 shares of Mayville Engineering Co worth $3.2M as of Q2 2026.
Mayville Engineering Co was a new Jeff Yass position in Q2 2026.
Mayville Engineering Co made up ﹤0.01% of Jeff Yass's portfolio in Q2 2026, its #5496 holding.
Jeff Yass first reported a position in Mayville Engineering Co in Q2 2019 and has held it in 9 quarters since.
154 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q2 2026.

Based on Susquehanna International Group's 13F filing for Q2 2026, filed 14 Aug 2026.