Boston Partners
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Boston Partners’s Mayville Engineering Co MEC Stock Holding History

Boston Partners’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 		$25.8M Buy
696,429
+463,792
+199% +$12.4M 0.02% 357
2026
Q1 		$4.18M Buy
232,637
+9,907
+4% +$191K ﹤0.01% 508
2025
Q4 		$4.17M Buy
222,730
+24,570
+12% +$401K ﹤0.01% 489
2025
Q3 		$2.73M Buy
+198,160
New +$2.98M ﹤0.01% 527

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
JT
Jupiter Topco New York $245B AUM

Boston Partners's MEC Position: Q2 2026 in Review

Boston Partners increased its Mayville Engineering Co (MEC) stake by 199% in Q2 2026, buying an estimated $12.4M and bringing the position to 696,429 shares worth $25.8M. The position accounts for 0.02% of the portfolio, ranked #357.

Boston Partners first reported a position in MEC in Q3 2025 and has held it in 4 quarters since. 155 funds tracked by Wall St. Rank hold MEC as of Q2 2026.

  • Boston Partners held 696,429 shares of Mayville Engineering Co worth $25.8M as of Q2 2026.
  • Boston Partners bought 463,792 Mayville Engineering Co shares in Q2 2026, an estimated $12.4M.
  • Mayville Engineering Co made up 0.02% of Boston Partners's portfolio in Q2 2026, its #357 holding.
  • Boston Partners first reported a position in Mayville Engineering Co in Q3 2025 and has held it in 4 quarters since.
  • 155 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q2 2026.

Based on Boston Partners's 13F filing for Q2 2026, filed 4 Aug 2026.