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
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

Allspring Global Investments
Allspring Global Investments Charlotte, North Carolina $59.7B AUM 29.08% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
PCM
Portolan Capital Management Boston, Massachusetts $1.88B AUM 115.74% 1-Year Est. Return
RA
Royce & Associates New York $10.1B AUM 42.88% 1-Year Est. Return
ER
EVR Research Richmond, Virginia $250M AUM 41.5% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
William Blair & Company
William Blair & Company Chicago, Illinois $34.9B AUM 18.88% 1-Year Est. Return
First Eagle Investment Management
First Eagle Investment Management New York $59B AUM 32.99% 1-Year Est. Return
GIM
Granahan Investment Management Waltham, Massachusetts $2.07B AUM 56.45% 1-Year Est. Return

Boston Partners's MEC Position: Q1 2026 in Review

Boston Partners increased its Mayville Engineering Co (MEC) stake by 4.4% in Q1 2026, buying an estimated $191K and bringing the position to 232,637 shares worth $4.18M. The position accounts for ﹤0.01% of the portfolio, ranked #508.

Boston Partners first reported a position in MEC in Q3 2025 and has held it in 3 quarters since. 124 funds tracked by Wall St. Rank hold MEC as of Q1 2026.

  • Boston Partners held 232,637 shares of Mayville Engineering Co worth $4.18M as of Q1 2026.
  • Boston Partners bought 9,907 Mayville Engineering Co shares in Q1 2026, an estimated $191K.
  • Mayville Engineering Co made up ﹤0.01% of Boston Partners's portfolio in Q1 2026, its #508 holding.
  • Boston Partners first reported a position in Mayville Engineering Co in Q3 2025 and has held it in 3 quarters since.
  • 124 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q1 2026.

Based on Boston Partners's 13F filing for Q1 2026, filed 11 May 2026.