MIAX in the 13F filings

Miami Intl HLDGS Inc · CUSIP 59356Q108

Sector · Other financial services Theme · Financial services· L3VLUP-defined

Quarter

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Quarter end: 30 Jun 2026; the date the book describes
Filed: 2 Sep 2026; latest of these filings; the earliest 3 Aug 2026
Managers listing it: 17; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q1 2026 and Q2 2026; 1 listed it in both
Shares listed: 11,598,565; combined, among listed positions
Reported value: $431m; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 12 buyers (opened or added shares) and 15 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +725,482.

Managers listing MIAX in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

17 of 17 holders

				Action		Filing
Susquehanna International Group LLP	3,355,043	$125m	under 0.1%	Added	+58,697	14 Aug 2026 (the filing on sec.gov)
Invesco Ltd	2,020,650	$75m	under 0.1%	Added	+435,647	14 Aug 2026 (the filing on sec.gov)
Balyasny Asset Management LLC	1,682,924	$63m	0.08%	New	new	14 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP	888,109	$33m	under 0.1%	Trimmed	-5,609	14 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	844,464	$31m	under 0.1%	Added	+685,278	14 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC	728,034	$27m	0.10%	Added	+689,512	3 Aug 2026 (the filing on sec.gov)
MFS Investment Management	406,274	$15m	under 0.1%	Added	+64,965	3 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.	355,528	$13m	under 0.1%	Added	+34,766	14 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP	287,480	$11m	under 0.1%	Added	+164,861	13 Aug 2026 (the filing on sec.gov)
Wellington Management Group LLP	262,170	$9.7m	under 0.1%	Trimmed	-182,681	14 Aug 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC	200,181	$7.4m	under 0.1%	Added	+42,498	14 Aug 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP	190,223	$7.1m	under 0.1%	Added	+160,587	14 Aug 2026 (the filing on sec.gov)
Millennium Management LLC	189,105	$7.0m	under 0.1%	Trimmed	-329,596	14 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP	89,200	$3.5m	under 0.1%	Added	+62,900	14 Aug 2026 (the filing on sec.gov)
Arrowstreet Capital LP	63,344	$2.4m	under 0.1%	Trimmed	-86,560	13 Aug 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	27,236	$1.0m	under 0.1%	Added	+26,585	13 Aug 2026 (the filing on sec.gov)
Janus Henderson Group Ltd	8,600	$320k	under 0.1%	Held	0	14 Aug 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

Balyasny Asset Management LLCnew position · 1,682,924 shares now+1,682,924
Walleye Capital LLCexisting position · 728,034 shares now+689,512
T. Rowe Price Associates Incexisting position · 844,464 shares now+685,278
Invesco Ltdexisting position · 2,020,650 shares now+435,647
Marshall Wace LLPexisting position · 287,480 shares now+164,861

Reductions

Millennium Management LLCexisting position · 189,105 shares now-329,596
Wellington Management Group LLPexisting position · 262,170 shares now-182,681
Arrowstreet Capital LPexisting position · 63,344 shares now-86,560
Two Sigma Investments LPexisting position · 888,109 shares now-5,609

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (1)

Balyasny Asset Management LLC$63m

Exited (11)

Citadel Advisors LLCwas $63m
Renaissance Technologies LLCwas $11m
Woodline Partners LPwas $10m
Tudor Investment Corpwas $10m
Soros Fund Management LLCwas $5.2m
Quantbot Technologies LPwas $3.7m
Voloridge Investment Management LLCwas $3.3m
Squarepoint Ops LLCwas $1.6m
Man Group PLCwas $415k
AQR Capital Management LLCwas $330k

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

5 in Q3 2025 to 3 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

MIAX and V →MIAX and AXP →MIAX and BAC →Choose a stock to compare with MIAX →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own MIAX, latest filings →Back to the 13F Explorer →

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Illustrative figures. Default values are plausible starting points chosen so a model has somewhere to begin. They are not data, not a view on any company, and not calibrated to anything. Outputs move with whatever you type in.

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Quarter	Holders	Reported value	Buyers	Sellers
Q3 2025	5	$30m	5	0
Q4 2025	3	$20m	15	12
Q1 2026	3	$15m	21	7
Q2 2026	3	$97m	12	15