CenterBook Partners’s Mayville Engineering Co MEC Stock Holding History

CenterBook 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	$2.16M	Sell	120,303 -135,488	-53%	-$2.61M	0.12%	228
2025 Q4	$4.79M	Buy	255,791 +78,132	+44%	+$1.27M	0.23%	108
2025 Q3	$2.44M	Buy	177,659 +82,573	+87%	+$1.24M	0.12%	228
2025 Q2	$1.52M	Sell	95,086 -3,467	-4%	-$49.5K	0.08%	271
2025 Q1	$1.32M	Buy	+98,553	New	+$1.48M	0.08%	265

Other funds holding MEC

Allspring Global Investments Charlotte, North Carolina $59.7B AUM 29.08% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

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

Royce & Associates New York $10.1B AUM 42.88% 1-Year Est. Return

EVR Research Richmond, Virginia $250M AUM 41.5% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

William Blair & Company Chicago, Illinois $34.9B AUM 18.88% 1-Year Est. Return

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

CenterBook Partners's MEC Position: Q1 2026 in Review

CenterBook Partners reduced its Mayville Engineering Co (MEC) stake by 53% in Q1 2026, selling an estimated $2.61M and leaving 120,303 shares worth $2.16M. The position accounts for 0.12% of the portfolio, ranked #228.

CenterBook Partners first reported a position in MEC in Q1 2025 and has held it in 5 quarters since. The position peaked at $4.79M in Q4 2025. 124 funds tracked by Wall St. Rank hold MEC as of Q1 2026.

CenterBook Partners held 120,303 shares of Mayville Engineering Co worth $2.16M as of Q1 2026.
CenterBook Partners sold 135,488 Mayville Engineering Co shares in Q1 2026, an estimated $2.61M.
Mayville Engineering Co made up 0.12% of CenterBook Partners's portfolio in Q1 2026, its #228 holding.
CenterBook Partners first reported a position in Mayville Engineering Co in Q1 2025 and has held it in 5 quarters since.
CenterBook Partners's Mayville Engineering Co position peaked at $4.79M in Q4 2025.
124 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q1 2026.

Based on CenterBook Partners's 13F filing for Q1 2026, filed 5 May 2026.