Miami International Holdings, Inc. (MIAX) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

70,128,197Shares Outstanding

38,792,784Shares held by institutions

$1,558,306,133Value of institutional holdings

55.32%Institutional ownership %

52.92%Shares Changed QoQ

161No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Miami International Holdings, Inc. (NYSE:MIAX) showed up in the 13F filings of 161 institutional investors as of December 2025.

Their combined ownership stood at 54.5% of outstanding shares in December 2025, up from 37.9% in September 2025.
They increased total shares held in Miami International Holdings by 50.73% from last quarter, and the number of investors in MIAX stayed flat annually.
During the quarter, 128 of these 161 funds increased positions in MIAX, 22 reduced exposure, and 11 held steady.
The aggregate institutional position in Miami International Holdings amounted to 38.21Mn shares as of December 2025, up by 12.86Mn shares quarter on quarter, and with no net change year over year.
As of December 31, 2025, T. Rowe Price Investment Management, Inc. held the largest stake in Miami International Holdings with 3.54Mn shares, accounting for 5.04% of total shares outstanding.
The biggest buyers of Miami International Holdings for the quarter ending December 2025 included AMERICAN CENTURY COMPANIES INC (1.19Mn), T. Rowe Price Investment Management, Inc. (1.11Mn), BlackRock, Inc. (1.05Mn), Goldman Sachs Group Inc (968.14K), Invesco Ltd. (820.25K).
The largest sellers of Miami International Holdings for the quarter ending December 2025 were Jpmorgan Chase & Co (809.08K), CITADEL ADVISORS LLC (355.47K), Morgan Stanley (300.1K), Royal Bank Of Canada (198.42K), MALTESE CAPITAL MANAGEMENT LLC (121.32K).
According to Business Quant data, leading holders of MIAX for December 2025 are T. Rowe Price Investment Management, Inc. (3.54Mn), SUSQUEHANNA INTERNATIONAL GROUP, LLP (3.28Mn), VANGUARD GROUP INC (1.93Mn), HORIZON KINETICS ASSET MANAGEMENT LLC (1.82Mn), BlackRock, Inc. (1.75Mn), AMERICAN CENTURY COMPANIES INC (1.45Mn), Alyeska Investment Group, L.P. (1.29Mn), Invesco Ltd. (1.28Mn), North Reef Capital Management LP (1.26Mn), Goldman Sachs Group Inc (1.16Mn).

161 Institutional Holders

38,792,784 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
T. Rowe Price Investment Management, Inc.	31 Dec, 2025	3,535,739	1,105,123	45.47%	$156,917.00
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	3,284,952	100	0.00%	$145,786,169.00
VANGUARD GROUP INC	31 Dec, 2025	1,928,286	545,770	39.48%	$85,577,333.00
HORIZON KINETICS ASSET MANAGEMENT LLC	31 Dec, 2025	1,819,798	437,395	31.64%	$80,762,635.00
BlackRock, Inc.	31 Dec, 2025	1,753,507	1,045,736	147.75%	$77,820,641.00
AMERICAN CENTURY COMPANIES INC	31 Dec, 2025	1,448,293	1,193,011	467.33%	$64,275,261.00
Alyeska Investment Group, L.P.	31 Dec, 2025	1,286,086	20,350	1.61%	$57,076,497.00
Invesco Ltd.	31 Dec, 2025	1,278,966	820,246	178.81%	$56,760,511.00
North Reef Capital Management LP	31 Dec, 2025	1,265,000	539,196	74.29%	$56,140,700.00
Goldman Sachs Group Inc	31 Dec, 2025	1,161,330	968,139	501.13%	$51,539,826.00
Allspring Global Investments Holdings, LLC	31 Dec, 2025	932,053	478,385	105.45%	$40,684,113.00
ADAGE CAPITAL PARTNERS GP, L.L.C.	31 Dec, 2025	881,329	249,677	39.53%	$39,113,381.00
Jpmorgan Chase & Co	31 Dec, 2025	814,340	-809,082	-49.84%	$36,140,409.00
Caldwell Investment Management Ltd.	31 Dec, 2025	738,810	75,000	11.30%	$33,726,334.00
LORD, ABBETT & CO. LLC	31 Dec, 2025	659,669	360,486	120.49%	$29,276.00
BLAIR WILLIAM & CO/IL	31 Dec, 2025	654,845	291,080	80.02%	$29,062,021.00
JANE STREET GROUP, LLC	31 Dec, 2025	638,050	148,452	30.32%	$28,316,659.00
CITADEL ADVISORS LLC	31 Dec, 2025	619,580	-355,470	-36.46%	$27,496,960.00
WELLINGTON MANAGEMENT GROUP LLP	31 Dec, 2025	616,118	32,998	5.66%	$27,343,316.00
State Street Corp	31 Dec, 2025	576,385	519,940	921.14%	$25,579,966.00

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