Jim Simons
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Jim Simons’s Mayville Engineering Co MEC Stock Holding History

Jim Simons’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 		$1.13M Sell
62,900
-8,300
-12% -$160K ﹤0.01% 2207
2025
Q4 		$1.33M Sell
71,200
-83,800
-54% -$1.37M ﹤0.01% 2112
2025
Q3 		$2.13M Buy
155,000
+11,000
+8% +$165K ﹤0.01% 2032
2025
Q2 		$2.3M Buy
144,000
+58,100
+68% +$830K ﹤0.01% 2029
2025
Q1 		$1.15M Sell
85,900
-26,800
-24% -$403K ﹤0.01% 2325
2024
Q4 		$1.77M Sell
112,700
-14,191
-11% -$259K ﹤0.01% 2135
2024
Q3 		$2.67M Buy
126,891
+104,591
+469% +$1.96M ﹤0.01% 1833
2024
Q2 		$372K Buy
+22,300
New +$337K ﹤0.01% 2820
2023
Q3 		– Sell
-15,900
Closed -$198K – 3925
2023
Q2 		$198K Buy
+15,900
New +$201K ﹤0.01% 3308
2022
Q4 		– Sell
-67,397
Closed -$439K – 4287
2022
Q3 		$439K Sell
67,397
-25,739
-28% -$185K ﹤0.01% 3001
2022
Q2 		$721K Buy
93,136
+81,036
+670% +$687K ﹤0.01% 2916
2022
Q1 		$113K Sell
12,100
-23,500
-66% -$267K ﹤0.01% 3772
2021
Q4 		$531K Sell
35,600
-106,223
-75% -$1.75M ﹤0.01% 3045
2021
Q3 		$2.67M Buy
141,823
+70,300
+98% +$1.2M ﹤0.01% 1877
2021
Q2 		$1.44M Buy
71,523
+30,400
+74% +$537K ﹤0.01% 2467
2021
Q1 		$591K Buy
41,123
+31,100
+310% +$458K ﹤0.01% 2846
2020
Q4 		$135K Buy
+10,023
New +$111K ﹤0.01% 3220

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 $552B AUM 44.19% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 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 $38.4B AUM 25.71% 1-Year Est. Return
First Eagle Investment Management
First Eagle Investment Management New York $59.9B AUM 27.01% 1-Year Est. Return
GIM
Granahan Investment Management Waltham, Massachusetts $2.07B AUM 56.45% 1-Year Est. Return

Jim Simons's MEC Position: Q1 2026 in Review

Jim Simons reduced its Mayville Engineering Co (MEC) stake by 12% in Q1 2026, selling an estimated $160K and leaving 62,900 shares worth $1.13M. The position accounts for ﹤0.01% of the portfolio, ranked #2207.

Jim Simons first reported a position in MEC in Q4 2020 and has held it in 17 quarters since. The position peaked at $2.67M in Q3 2024. 124 funds tracked by Wall St. Rank hold MEC as of Q1 2026.

  • Jim Simons held 62,900 shares of Mayville Engineering Co worth $1.13M as of Q1 2026.
  • Jim Simons sold 8,300 Mayville Engineering Co shares in Q1 2026, an estimated $160K.
  • Mayville Engineering Co made up ﹤0.01% of Jim Simons's portfolio in Q1 2026, its #2207 holding.
  • Jim Simons first reported a position in Mayville Engineering Co in Q4 2020 and has held it in 17 quarters since.
  • Jim Simons's Mayville Engineering Co position peaked at $2.67M in Q3 2024.
  • 124 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q1 2026.

Based on Renaissance Technologies's 13F filing for Q1 2026, filed 14 May 2026.