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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 		$5.61M Buy
+149,800
New +$4M ﹤0.01% 4391
2024
Q3 		– Sell
-22,000
Closed -$367K – 12602
2024
Q2 		$367K Buy
22,000
+8,000
+57% +$121K ﹤0.01% 9015
2024
Q1 		$201K Sell
14,000
-17,700
-56% -$231K ﹤0.01% 10593
2023
Q4 		$457K Buy
+31,700
New +$393K ﹤0.01% 8896
2023
Q3 		– Sell
-24,900
Closed -$310K – 12568
2023
Q2 		$310K Sell
24,900
-1,800
-7% -$22.7K ﹤0.01% 9368
2023
Q1 		$398K Buy
+26,700
New +$389K ﹤0.01% 9108

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

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.