Jane Street
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Jane Street’s Mayville Engineering Co MEC Stock Holding History

Jane Street’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 		$753K Buy
+20,100
New +$537K ﹤0.01% 7139
2026
Q1 		– Sell
-22,400
Closed -$419K – 12426
2025
Q4 		$419K Buy
+22,400
New +$365K ﹤0.01% 8095

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

Jane Street's MEC Position: Q2 2026 in Review

Jane Street opened a new position in Mayville Engineering Co (MEC) in Q2 2026: 356,151 shares worth $13.3M. The stake represents ﹤0.01% of the portfolio and ranks #2522 among its holdings. This is a return to the name: Jane Street previously reported a position in MEC as recently as Q4 2025.

Jane Street first reported a position in MEC in Q4 2020 and has held it in 10 quarters since. 155 funds tracked by Wall St. Rank hold MEC as of Q2 2026.

  • Jane Street held 356,151 shares of Mayville Engineering Co worth $13.3M as of Q2 2026.
  • Mayville Engineering Co was a new Jane Street position in Q2 2026.
  • Mayville Engineering Co made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #2522 holding.
  • Jane Street first reported a position in Mayville Engineering Co in Q4 2020 and has held it in 10 quarters since.
  • 155 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.