Ticker · CUSIP 59356Q108

MIAX

MIAMI INTL HLDGS INC

Financial Services·Capital Markets

···Share

Holders (tracked)

Combined shares

2,570,544

Combined value

$114.08M

Last close

$45.17

Quarter

2025Q4

Price is +1.8% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$45.17+14.43 (+46.94%)H $50.96 · L $30.74 · Avg Vol 1.1M

Position opened

Tracked holders · last 8 quarters

+2 vs previous quarter over the last 2.

SEC event timeline

17 events

Ken Griffin (Citadel Advisors) trimmed2026-02-17
−355,470 shares · 2025Q4
Position
D.E. Shaw & Co. exited2026-02-17
−25,063 shares · 2025Q4
Position
Two Sigma Investments added2026-02-17
+90,320 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+56,006 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) added2026-02-17
+126,182 shares · 2025Q4
Position
T. Rowe Price trimmed2026-02-17
−268,296 shares · 2025Q4
Position
Wellington Management added2026-02-17
+32,998 shares · 2025Q4
Position
George Soros (Soros Fund Mgmt) added2026-02-13
+50,300 shares · 2025Q4
Position
Renaissance Technologies opened position2026-02-12
+195,099 shares · 2025Q4
Position
Norges Bank (Norway SWF) opened position2026-02-10
+277,200 shares · 2025Q4
Position
Two Sigma Investments opened position2025-11-14
+50,011 shares · 2025Q3
Position
D.E. Shaw & Co. opened position2025-11-14
+25,063 shares · 2025Q3
Position
T. Rowe Price opened position2025-11-14
+398,782 shares · 2025Q3
Position
Wellington Management opened position2025-11-14
+583,120 shares · 2025Q3
Position
George Soros (Soros Fund Mgmt) opened position2025-11-14
+104,260 shares · 2025Q3
Position
Jonathan Auerbach (Hound Partners) opened position2025-11-14
+25,000 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) opened position2025-11-14
+158,482 shares · 2025Q3
Position

Insider activity

Last 30 days

Net (open-market)

Buys

0 · $0

Sells

0 · $0

Unique insiders

Date	Insider	Code	Shares	Price	Value
04-09	Beckelman John Director	M	8,667	$12.00	$104.0K

View full insider history for MIAX →

Follow-the-investor returns

If you'd copied each holder of MIAX…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Jonathan Auerbach (Hound Partners)	2025Q3	$40.26	+12.2%	$1.1M
T. Rowe Price	2025Q3	$40.26	+12.2%	$5.9M
Wellington Management	2025Q3	$40.48	+11.6%	$27.8M
George Soros (Soros Fund Mgmt)	2025Q3	$41.60	+8.6%	$7.0M
Izzy Englander (Millennium Mgmt)	2025Q3	$42.09	+7.3%	$12.9M
Two Sigma Investments	2025Q3	$42.91	+5.3%	$6.3M
Ken Griffin (Citadel Advisors)	2025Q3	$44.15	+2.3%	$1.5M
Ken Griffin (Citadel Advisors)	2025Q3	$44.15	+2.3%	$1.5M
Ken Griffin (Citadel Advisors)	2025Q3	$44.15	+2.3%	$1.5M
Paul Tudor Jones (Tudor Investment)	2025Q4	$44.38	+1.8%	$2.5M
Norges Bank (Norway SWF)	2025Q4	$44.38	+1.8%	$12.5M
Renaissance Technologies	2025Q4	$44.38	+1.8%	$8.8M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions3

Norges Bank (Norway SWF)
+277,200
$12.3M
Renaissance Technologies
+195,099
$8.7M
Paul Tudor Jones (Tudor Investment)
+56,006
$2.5M

Added to4

Izzy Englander (Millennium Mgmt)
+126,182
$5.6M
Two Sigma Investments
+90,320
$4.0M
George Soros (Soros Fund Mgmt)
+50,300
$2.2M
Wellington Management
+32,998
$1.5M

Trimmed2

Ken Griffin (Citadel Advisors)
−355,470
$15.8M
T. Rowe Price
−268,296
$12K

Exited1

D.E. Shaw & Co.
−25,063
$1.0M

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2025Q3	10	2,401,868	$96.7M	—
2025Q4	12	2,570,544	$114.1M	+2

Who owns MIAX

12 super-investors · 2025Q4

Tracked stake

2.57M

Combined value

$114M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New3Added4Trim4Held1

#	Manager	Shares	Value	% of book	Last action	8Q trend
1	Ken Griffin Citadel Advisors	619.6K	$27M	0.0%	Trim−355.5K
2	Wellington Management	616.1K	$27M	0.0%	Added+33.0K
3	Izzy Englander Millennium Mgmt	284.7K	$13M	0.0%	Added+126.2K
4	Norges Bank Norway SWF	277.2K	$12M	0.0%	New+277.2K	—
5	Renaissance Technologies	195.1K	$9M	0.0%	New+195.1K	—
6	George Soros Soros Fund Mgmt	154.6K	$7M	0.1%	Added+50.3K
7	Two Sigma Investments	140.3K	$6M	0.0%	Added+90.3K
8	T. Rowe Price	130.5K	$6M	0.0%	Trim−268.3K
9	Paul Tudor Jones Tudor Investment	56.0K	$2M	0.0%	New+56.0K	—
10	Ken Griffin Citadel Advisors	38.9K	$2M	0.0%	Trim−355.5K
11	Ken Griffin Citadel Advisors	32.6K	$1M	0.0%	Trim−355.5K
12	Jonathan Auerbach Hound Partners	25.0K	$1M	0.1%	Held

Recent moves

17 transactions

TRIMKen Griffin (Citadel Advisors)
−355,470 · 2025Q4
SOLDD.E. Shaw & Co.
−25,063 · 2025Q4
ADDTwo Sigma Investments
+90,320 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+56,006 · 2025Q4
ADDIzzy Englander (Millennium Mgmt)
+126,182 · 2025Q4
TRIMT. Rowe Price
−268,296 · 2025Q4
ADDWellington Management
+32,998 · 2025Q4
ADDGeorge Soros (Soros Fund Mgmt)
+50,300 · 2025Q4
NEWRenaissance Technologies
+195,099 · 2025Q4
NEWNorges Bank (Norway SWF)
+277,200 · 2025Q4
NEWTwo Sigma Investments
+50,011 · 2025Q3
NEWD.E. Shaw & Co.
+25,063 · 2025Q3
NEWT. Rowe Price
+398,782 · 2025Q3
NEWWellington Management
+583,120 · 2025Q3
NEWGeorge Soros (Soros Fund Mgmt)
+104,260 · 2025Q3
NEWJonathan Auerbach (Hound Partners)
+25,000 · 2025Q3
NEWIzzy Englander (Millennium Mgmt)
+158,482 · 2025Q3

Embed this chart

Paste this iframe anywhere to embed the live MIAX chart.

<iframe src="https://openstocks.me/embed/stocks/MIAX" width="100%" height="480" frameborder="0" loading="lazy" title="MIAX chart by OpenStocks" style="border:0;border-radius:12px;background:transparent"></iframe>

Preview: https://openstocks.me/embed/stocks/MIAX

Explore related topics