XT
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XTX Topco’s Mayville Engineering Co MEC Stock Holding History

XTX Topco’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 		$2.46M Buy
65,604
+24,126
+58% +$645K 0.03% 914
2026
Q1 		$745K Buy
41,478
+20,144
+94% +$388K 0.01% 1675
2025
Q4 		$399K Buy
+21,334
New +$348K 0.01% 1816

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

XTX Topco's MEC Position: Q2 2026 in Review

XTX Topco increased its Mayville Engineering Co (MEC) stake by 58% in Q2 2026, buying an estimated $645K and bringing the position to 65,604 shares worth $2.46M. The position accounts for 0.03% of the portfolio, ranked #914.

XTX Topco first reported a position in MEC in Q4 2025 and has held it in 3 quarters since. 155 funds tracked by Wall St. Rank hold MEC as of Q2 2026.

  • XTX Topco held 65,604 shares of Mayville Engineering Co worth $2.46M as of Q2 2026.
  • XTX Topco bought 24,126 Mayville Engineering Co shares in Q2 2026, an estimated $645K.
  • Mayville Engineering Co made up 0.03% of XTX Topco's portfolio in Q2 2026, its #914 holding.
  • XTX Topco first reported a position in Mayville Engineering Co in Q4 2025 and has held it in 3 quarters since.
  • 155 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.