Marshall Wace
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Marshall Wace’s Miami International Holdings MIAX Stock Holding History

Marshall Wace’s Portfolio MIAX Stock Details MIAX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$10.7M Buy
287,480
+164,861
+134% +$7.37M 0.01% 1011
2026
Q1 		$4.77M Buy
+122,619
New +$5.05M ﹤0.01% 1331
2025
Q4 		– Sell
-77,960
Closed -$3.14M – 3634
2025
Q3 		$3.14M Buy
+77,960
New +$2.85M ﹤0.01% 1401

Other funds holding MIAX

HKAM
Horizon Kinetics Asset Management New York $8.82B AUM 23.05% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
JD6
J Digital 6 Chicago, Illinois $169M AUM 111.5% 1-Year Est. Return
William Blair & Company
William Blair & Company Chicago, Illinois $38.4B AUM 25.71% 1-Year Est. Return
Balyasny Asset Management
Balyasny Asset Management Chicago, Illinois $80.2B AUM 51.53% 1-Year Est. Return

Marshall Wace's MIAX Position: Q2 2026 in Review

Marshall Wace increased its Miami International Holdings (MIAX) stake by 134% in Q2 2026, buying an estimated $7.37M and bringing the position to 287,480 shares worth $10.7M. The position accounts for 0.01% of the portfolio, ranked #1011.

Marshall Wace first reported a position in MIAX in Q3 2025 and has held it in 3 quarters since. 206 funds tracked by Wall St. Rank hold MIAX as of Q2 2026.

  • Marshall Wace held 287,480 shares of Miami International Holdings worth $10.7M as of Q2 2026.
  • Marshall Wace bought 164,861 Miami International Holdings shares in Q2 2026, an estimated $7.37M.
  • Miami International Holdings made up 0.01% of Marshall Wace's portfolio in Q2 2026, its #1011 holding.
  • Marshall Wace first reported a position in Miami International Holdings in Q3 2025 and has held it in 3 quarters since.
  • 206 funds tracked by Wall St. Rank held Miami International Holdings as of Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.