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 		$1.6M Buy
+42,800
New +$1.14M ﹤0.01% 7052
2025
Q2 		– Sell
-7,400
Closed -$99.4K – 14047
2025
Q1 		$99.4K Buy
7,400
+2,900
+64% +$43.6K ﹤0.01% 11479
2024
Q4 		$70.7K Buy
4,500
+2,200
+96% +$40.2K ﹤0.01% 11949
2024
Q3 		$48.5K Buy
2,300
+1,100
+92% +$20.6K ﹤0.01% 11950
2024
Q2 		$20K Sell
1,200
-1,100
-48% -$16.6K ﹤0.01% 12640
2024
Q1 		$33K Sell
2,300
-23,700
-91% -$309K ﹤0.01% 12603
2023
Q4 		$375K Buy
26,000
+6,600
+34% +$81.9K ﹤0.01% 8701
2023
Q3 		$213K Buy
19,400
+4,700
+32% +$54.3K ﹤0.01% 9780
2023
Q2 		$183K Buy
14,700
+13,900
+1,738% +$176K ﹤0.01% 10026
2023
Q1 		$11.9K Buy
+800
New +$11.7K ﹤0.01% 13447

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.