Citadel Advisors
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Citadel Advisors’s Mayville Engineering Co MEC Stock Holding History

Citadel Advisors’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 		$7.44M Buy
198,712
+141,926
+250% +$3.79M ﹤0.01% 4053
2026
Q1 		$1.02M Sell
56,786
-46,677
-45% -$899K ﹤0.01% 7613
2025
Q4 		$1.94M Buy
+103,463
New +$1.69M ﹤0.01% 5978
2025
Q3 		– Sell
-15,989
Closed -$255K – 13569
2025
Q2 		$255K Sell
15,989
-127,758
-89% -$1.83M ﹤0.01% 10161
2025
Q1 		$1.93M Buy
143,747
+131,316
+1,056% +$1.98M ﹤0.01% 5601
2024
Q4 		$195K Sell
12,431
-5,402
-30% -$98.8K ﹤0.01% 10498
2024
Q3 		$376K Buy
17,833
+1,496
+9% +$28K ﹤0.01% 8840
2024
Q2 		$272K Buy
16,337
+15,059
+1,178% +$228K ﹤0.01% 9328
2024
Q1 		$18.3K Buy
+1,278
New +$16.7K ﹤0.01% 13067
2023
Q4 		– Sell
-35,376
Closed -$439K – 14860
2023
Q3 		$388K Sell
35,376
-60,179
-63% -$695K ﹤0.01% 8618
2023
Q2 		$1.19M Buy
95,555
+75,231
+370% +$951K ﹤0.01% 6101
2023
Q1 		$303K Buy
+20,324
New +$296K ﹤0.01% 9362
2022
Q4 		– Sell
-74,889
Closed -$487K – 15227
2022
Q3 		$487K Sell
74,889
-26,381
-26% -$190K ﹤0.01% 8509
2022
Q2 		$784K Buy
101,270
+23,034
+29% +$195K ﹤0.01% 7589
2022
Q1 		$733K Buy
+78,236
New +$888K ﹤0.01% 8452

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

Citadel Advisors's MEC Position: Q2 2026 in Review

Citadel Advisors increased its Mayville Engineering Co (MEC) stake by 250% in Q2 2026, buying an estimated $3.79M and bringing the position to 198,712 shares worth $7.44M. The position accounts for ﹤0.01% of the portfolio, ranked #4053.

Citadel Advisors first reported a position in MEC in Q1 2022 and has held it in 15 quarters since. 155 funds tracked by Wall St. Rank hold MEC as of Q2 2026.

  • Citadel Advisors held 198,712 shares of Mayville Engineering Co worth $7.44M as of Q2 2026.
  • Citadel Advisors bought 141,926 Mayville Engineering Co shares in Q2 2026, an estimated $3.79M.
  • Mayville Engineering Co made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #4053 holding.
  • Citadel Advisors first reported a position in Mayville Engineering Co in Q1 2022 and has held it in 15 quarters since.
  • 155 funds tracked by Wall St. Rank held Mayville Engineering Co as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.