Simplex Trading
MIAX

Simplex Trading’s Miami International Holdings MIAX Stock Holding History

Simplex Trading’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
Q1 		$101K Buy
2,600
+2,200
+550% +$90.6K ﹤0.01% 5072
2025
Q4 		$17.8K Sell
400
-41,700
-99% -$1.86M ﹤0.01% 6584
2025
Q3 		$1.69M Buy
+42,100
New +$1.54M ﹤0.01% 2486

Other funds holding MIAX

T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
HKAM
Horizon Kinetics Asset Management New York $9.23B AUM 27.52% 1-Year Est. Return
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $893B AUM 36.07% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $64.8B AUM 42.7% 1-Year Est. Return

Simplex Trading's MIAX Position: Q1 2026 in Review

Simplex Trading increased its Miami International Holdings (MIAX) stake by 312,600% in Q1 2026, buying an estimated $1.03M and bringing the position to 25,016 shares worth $974K. The position accounts for ﹤0.01% of the portfolio, ranked #2524.

Simplex Trading first reported a position in MIAX in Q4 2025 and has held it in 2 quarters since. 201 funds tracked by Wall St. Rank hold MIAX as of Q1 2026.

  • Simplex Trading held 25,016 shares of Miami International Holdings worth $974K as of Q1 2026.
  • Simplex Trading bought 25,008 Miami International Holdings shares in Q1 2026, an estimated $1.03M.
  • Miami International Holdings made up ﹤0.01% of Simplex Trading's portfolio in Q1 2026, its #2524 holding.
  • Simplex Trading first reported a position in Miami International Holdings in Q4 2025 and has held it in 2 quarters since.
  • 201 funds tracked by Wall St. Rank held Miami International Holdings as of Q1 2026.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.