SEI Investments
MIAX

SEI Investments’s Miami International Holdings MIAX Stock Holding History

SEI Investments’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 		$11.4M Sell
307,062
-219,301
-42% -$9.81M 0.01% 1072
2026
Q1 		$20.5M Buy
526,363
+186,108
+55% +$7.67M 0.02% 788
2025
Q4 		$15.1M Buy
340,255
+239,064
+236% +$10.7M 0.01% 870
2025
Q3 		$4.07M Buy
+101,191
New +$3.7M ﹤0.01% 1386

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

SEI Investments's MIAX Position: Q2 2026 in Review

SEI Investments reduced its Miami International Holdings (MIAX) stake by 42% in Q2 2026, selling an estimated $9.81M and leaving 307,062 shares worth $11.4M. The position accounts for 0.01% of the portfolio, ranked #1072.

SEI Investments first reported a position in MIAX in Q3 2025 and has held it in 4 quarters since. The position peaked at $20.5M in Q1 2026. 206 funds tracked by Wall St. Rank hold MIAX as of Q2 2026.

  • SEI Investments held 307,062 shares of Miami International Holdings worth $11.4M as of Q2 2026.
  • SEI Investments sold 219,301 Miami International Holdings shares in Q2 2026, an estimated $9.81M.
  • Miami International Holdings made up 0.01% of SEI Investments's portfolio in Q2 2026, its #1072 holding.
  • SEI Investments first reported a position in Miami International Holdings in Q3 2025 and has held it in 4 quarters since.
  • SEI Investments's Miami International Holdings position peaked at $20.5M in Q1 2026.
  • 206 funds tracked by Wall St. Rank held Miami International Holdings as of Q2 2026.

Based on SEI Investments's 13F filing for Q2 2026, filed 14 Aug 2026.