XOOMAR

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Every FINRA and SEC series the site collects for MIAMI INTERNATIONAL HOLDINGS, INC.: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on NYSE, classified by the SEC as security brokers, dealers & flotation companies.

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7.4M

Short interest

settlement 2026-08-14

5.4

Days to cover

+18.7% vs prior

48.3%

Short share of volume

2026-09-11

484

Fails to deliver

settlement 2026-07-29

-$24.3M

Insider flow, 90 days

0 buys, 18 sells

As of 2026-09-11.

Short interest

FINRA, twice a month; the last 12 months shown, all 25 settlements in the JSON

As of 14 August 2026, short interest in MIAX is 7,390,843 shares, down 181,928 shares over the last month. Over the last 25 readings it ranged from 751,313 shares (15 August 2025) to 7,587,144 shares (30 June 2026). The latest reading sits at the top of that range. At the reported average volume of 1.4M shares a day that is 5.4 days to cover, elevated.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-147,390,843+18.7%1,365,3815.41
2026-07-316,225,929-17.8%1,157,1505.38
2026-07-157,572,771-0.2%1,697,0274.46
2026-06-307,587,144+57.1%3,838,9161.98
2026-06-154,829,534+6.8%2,198,2642.20
2026-05-294,524,354+28.1%1,180,6223.83
2026-05-153,530,406+49.9%1,468,1802.40
2026-04-302,354,553+4.8%837,3352.81
2026-04-152,246,370-33.8%1,385,1581.62
2026-03-313,394,120+34.7%1,318,2052.57
2026-03-132,519,833+16.2%1,411,7821.78
2026-02-272,169,226-17.9%2,142,4811.01
2026-02-132,643,801-6.1%1,423,6771.86
2026-01-302,816,364+18.4%771,4403.65
2026-01-152,377,849-40.5%1,056,0412.25
2025-12-313,996,304+99.1%1,268,9423.15
2025-12-152,007,443+50.5%916,1552.19
2025-11-281,334,115-28.7%534,4502.50
2025-11-141,871,966+46.5%599,2623.12
2025-10-311,277,345-8.1%322,4883.96
2025-10-151,389,331-42.4%683,8772.03
2025-09-302,411,316+19.0%796,8393.03
2025-09-152,026,611+31.7%597,1653.39
2025-08-291,538,961+104.8%1,384,4961.11

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of MIAX volume is 48.3%, down 7.7 points over the last five sessions. Over the last 52 readings it ranged from 28.3% (26 August 2026) to 82.4% (30 June 2026). The latest reading is 7.9 points below the 30-session average of 56.2%, on 423K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-11204K423K48.3%0
2026-09-10121K282K42.8%0
2026-09-09177K434K40.7%0
2026-09-08294K631K46.7%0
2026-09-04182K360K50.6%0
2026-09-03381K679K56.0%600
2026-09-02447K874K51.2%6,492
2026-09-01362K599K60.4%0
2026-08-31351K445K78.9%23,093
2026-08-28319K392K81.3%18,750
2026-08-27225K375K60.0%0
2026-08-26162K571K28.3%15
2026-08-25147K441K33.3%0
2026-08-24242K347K69.7%0
2026-08-21234K421K55.6%0
2026-08-20226K500K45.3%0
2026-08-19426K763K55.9%0
2026-08-18128K255K50.0%100
2026-08-17154K293K52.5%9,450
2026-08-1488K228K38.7%1
2026-08-1396K203K47.4%46
2026-08-12377K555K67.9%2
2026-08-11277K554K49.9%0
2026-08-10367K544K67.4%4
2026-08-07303K473K64.1%44
2026-08-06643K944K68.1%0
2026-08-05424K585K72.4%742
2026-08-04222K320K69.3%25
2026-08-03206K341K60.4%10
2026-07-31318K433K73.5%786

Fails to deliver

SEC, by settlement date. JSON

As of 29 July 2026, the fails-to-deliver balance in MIAX is 484 shares, down 1,501 shares over the last settlement date. Over the last 52 readings it ranged from 3 shares (2 July 2026) to 539,396 shares (23 March 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-07-29484$46.20$22K
2026-07-211,985$42.04$83K
2026-07-163,026$42.43$128K
2026-07-1041,361$42.99$1.8M
2026-07-067,842$40.84$320K
2026-07-023$39.05$117
2026-07-01293$37.16$11K
2026-06-303,170$36.83$117K
2026-06-2528,900$36.49$1.1M
2026-06-12100$41.27$4K
2026-06-1019,747$39.80$786K
2026-06-0275$46.10$3K
2026-04-2918,800$47.30$889K
2026-04-2818,947$46.72$885K
2026-04-20175$45.17$8K
2026-04-152,732$42.91$117K
2026-04-13115$41.95$5K
2026-04-09231$42.22$10K
2026-03-3115,173$37.50$569K
2026-03-3015,173$37.31$566K
2026-03-27600$38.31$23K
2026-03-23539,396$39.10$21.1M
2026-03-1927,696$39.55$1.1M
2026-03-0621,279$42.38$902K
2026-03-0439,658$42.04$1.7M
2026-03-03384,775$42.89$16.5M
2026-02-2621,840$40.99$895K
2026-02-23171,404$40.53$6.9M
2026-02-1920,038$40.20$806K
2026-02-18459,893$40.89$18.8M

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

Insiders at MIAX reported 18 open-market sells worth $24.3M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Brown Shelly (EVP, Chief Strategy Officer) on 2026-09-11.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-11Brown ShellyEVP, Chief Strategy OfficerTax withholding16K$42.54$693K338K
2026-09-03Gallagher Thomas P.Chairman &amp; CEOOption exercise4K$22.40$100K787K
2026-09-03Gallagher Thomas P.Chairman &amp; CEOOption exercise13K$15.22$200K782K
2026-09-03Gallagher Thomas P.Chairman &amp; CEOOption exercise8K$12.00$100K769K
2026-09-03Gallagher Thomas P.Chairman &amp; CEOOption exercise17K$12.00$200K761K
2026-09-03Gallagher Thomas P.Chairman &amp; CEOSell47K$42.43$2.0M1.4M
2026-09-03Gallagher Thomas P.Chairman &amp; CEOOption exercise47K$12.00$564K1.5M
2026-09-03Deitzel EdwardEVP, CRO, CCO MIAX ExchangesSell11K$42.21$464K120K
2026-09-03Deitzel EdwardEVP, CRO, CCO MIAX ExchangesOption exercise11K$12.00$132K131K
2026-09-02Schafer Douglas M. JREVP and CIOSell48K$40.48$1.9M387K
2026-09-02Schafer Douglas M. JREVP and CIOOption exercise5K$12.00$56K435K
2026-09-02Schafer Douglas M. JREVP and CIOOption exercise43K$12.00$520K431K
2026-09-02Teekell Judson Grayn/aSell3K$40.89$123K69K
2026-09-02Teekell Judson Grayn/aSell6K$41.58$231K81K
2026-09-02Comly Barbara J.EVP, GC &amp; Corporate SecretarySell44K$40.49$1.8M840K
2026-09-02Comly Barbara J.EVP, GC &amp; Corporate SecretaryOption exercise44K$12.00$533K884K
2026-08-19Gallagher Thomas P.Chairman &amp; CEOSell150K$41.13$6.2M1.4M
2026-08-18Gallagher Thomas P.Chairman &amp; CEOTax withholding150K$42.41$6.4M1.6M
2026-08-18Comly Barbara J.EVP, GC &amp; Corporate SecretaryTax withholding43K$42.41$1.8M840K
2026-08-17Schwarzkopf Cynthian/aSell5K$42.85$214K89K
2026-08-17Schwarzkopf Cynthian/aOption exercise5K$12.00$60K94K
2026-08-17Emmons LanceEVP and CFOSell35K$42.83$1.5M87K
2026-08-04Schafer Douglas M. JREVP and CIOSell48K$45.71$2.2M387K
2026-08-04Schafer Douglas M. JREVP and CIOOption exercise48K$12.00$576K435K
2026-08-04Teekell Judson Grayn/aSell3K$45.79$137K72K
2026-08-04Jayabalan HarishEVP, CISO and CROSell20K$45.90$918K78K
2026-08-04Jayabalan HarishEVP, CISO and CROOption exercise6K$15.22$89K98K
2026-08-04Jayabalan HarishEVP, CISO and CROOption exercise14K$12.00$170K92K
2026-08-04Gallagher Thomas P.Chairman &amp; CEOSell48K$45.69$2.2M1.7M
2026-08-04Gallagher Thomas P.Chairman &amp; CEOOption exercise48K$12.00$580K1.8M
2026-08-04Eckert Kurt M.n/aSell1K$45.80$49K150K
2026-08-04Eckert Kurt M.n/aOption exercise1K$12.00$13K151K
2026-08-04Deitzel EdwardEVP, CRO, CCO MIAX ExchangesSell11K$45.78$504K120K
2026-08-04Deitzel EdwardEVP, CRO, CCO MIAX ExchangesOption exercise11K$12.00$132K131K
2026-08-04Comly Barbara J.EVP, GC &amp; Corporate SecretarySell44K$45.69$2.0M883K
2026-08-04Comly Barbara J.EVP, GC &amp; Corporate SecretaryOption exercise44K$12.00$533K927K
2026-07-13Comly Barbara J.EVP, GC &amp; Corporate SecretarySell28K$41.98$1.2M883K
2026-07-13Comly Barbara J.EVP, GC &amp; Corporate SecretaryOption exercise28K$12.00$336K911K
2026-07-08BROWN DAVID An/aTax withholding171$43.72$7K7K
2026-07-06Brown ShellyEVP, Chief Strategy OfficerSell16K$42.13$674K354K
2026-07-06Brown ShellyEVP, Chief Strategy OfficerOption exercise16K$12.00$192K370K
2026-06-16Al-Bahar Talal Jassimn/aGrant5K$0.00$041K
2026-06-15Al-Bahar Talal Jassimn/aGrant2K$0.00$036K
2026-06-11Stahlin Pauln/aTax withholding1K$40.79$48K35K
2026-06-11Stahlin Pauln/aOption exercise4K$12.00$48K36K
2026-06-09Jayabalan HarishEVP, CISO and CROSell10K$40.04$392K73K
2026-06-09Jayabalan HarishEVP, CISO and CROOption exercise10K$12.00$117K83K
2026-06-09Stahlin Pauln/aOption exercise7K$12.00$84K32K
2026-06-08Jayabalan HarishEVP, CISO and CROSell10K$40.12$410K73K
2026-06-08Jayabalan HarishEVP, CISO and CROOption exercise10K$12.00$123K84K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are the rarer, stronger signal.

Planned sales (Form 144)

Newest first. JSON

8 Form 144 notices on file for MIAX worth $28.7M at the prices reported; 8 in the last 90 days worth $28.7M. Latest: GALLAGHER INVESTMENTS LLC filed on 2026-09-03 to sell 141,000 shares ($5.7M) from 2026-09-03.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-03GALLAGHER INVESTMENTS LLCDirector, Officer141K$5.7M0.142%2026-09-03Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-19GALLAGHER INVESTMENTS LLCDirector, Officer150K$6.3M0.151%2026-08-19Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-04J. GRAY TEEKELLDirector6K$281K0.006%2026-08-04Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-04HARISH JAYABALANOfficer64K$3.0M0.067%2026-08-04Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-04GALLAGHER INVESTMENTS LLCDirector, Officer48K$2.3M0.051%2026-08-04Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-04EDWARD DEITZELOfficer44K$2.1M0.046%2026-08-04Morgan Stanley Smith Barney LLC Executive Financial Services
2026-08-04BARBARA J. COMLYOfficer181K$8.5M0.190%2026-08-04Morgan Stanley Smith Barney LLC Executive Financial Services
2026-07-15CYNTHIA SCHWARZKOPFDirector15K$620K0.016%2026-07-15Morgan Stanley Smith Barney LLC Executive Financial Services

13F holders

Tracked managers holding MIAX at their latest 13F. JSON

4 of the 30 tracked managers held MIAX at their latest 13F, $61.0M in total at quarter-end prices. Two Sigma Investments is the largest at $33.0M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 2 cut.

FundQuarterSharesValueOf portfolioChange in shares
Two Sigma Investments2026-06-30888K$33.0M0.02%-6K
D. E. Shaw & Co.2026-06-30385K$14.3M0.01%+65K
Millennium Management2026-06-30189K$7.0M0.00%new or n/a
Citadel Advisors2026-06-30179K$6.7M0.00%-1.5M

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

What this page is

MIAMI INTERNATIONAL HOLDINGS, INC. in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX), SEC CIK 1438472, listed on NYSE, classified by the SEC as security brokers, dealers & flotation companies. The cross-market tables live on the short interest and insider transactions hubs.

Source and method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-14.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-07-29.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-09-03.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-11.JSON and CSV
Company record
EDGAR filing index for CIK 1438472Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 13 Sep 05:40 UTC.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other companies the SEC classifies as security brokers, dealers & flotation companies

Datasets

Frequently Asked Questions

How much of MIAX is sold short?
7,390,843 shares were held short at the 2026-08-14 settlement, 5.4 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is MIAX's daily short volume?
On 2026-09-11, 204,123 of the 422,559 MIAX shares reported to FINRA were sold short, 48.3% of the day's reported volume. Short volume is a flow for one day, not a position.
Does MIAX have fails to deliver?
The SEC's latest file shows 484 MIAX shares failed to deliver at settlement 2026-07-29. Fails are reported per settlement date and published twice a month with a lag.
Are MIAX insiders buying or selling?
Insiders at MIAX reported 18 open-market sells worth $24.3M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Brown Shelly (EVP, Chief Strategy Officer) on 2026-09-11.
Have MIAX insiders filed to sell?
8 Form 144 notices on file for MIAX worth $28.7M at the prices reported; 8 in the last 90 days worth $28.7M. Latest: GALLAGHER INVESTMENTS LLC filed on 2026-09-03 to sell 141,000 shares ($5.7M) from 2026-09-03.
Which funds hold MIAX?
4 of the 30 tracked managers held MIAX at their latest 13F, $61.0M in total at quarter-end prices. Two Sigma Investments is the largest at $33.0M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 2 cut.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.