Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

MIAMI INTERNATIONAL HOLDINGS, INC.

MIAX · NYSE · CIK 0001438472 · Financial Services · Capital Markets

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

151 Form 4 transaction lines observed in the same window
50 sales · 101 option, withholding, award, gift or other lines

Last qualifying purchase2026-03-05 · HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAY · $310.2K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Schafer Douglas M. JREVP and CIO
○▼○▼○▼○▼
Gallagher Thomas P.Chairman & CEO
○▼○▼○▼
Deitzel EdwardEVP, CRO, CCO MIAX Exchanges
○▼○▼
Comly Barbara J.EVP, GC & Corporate Secretary
▼○○▼
Jayabalan HarishEVP, CISO and CRO
○▼○
Brown ShellyEVP, Chief Strategy Officer
○▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 4 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2026-03-05 · HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAY.

Recent Form 4 activity

4Purchases
69Sales
129Other Form 4 lines
108SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING50 sale line(s) · context only
OTHER101 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
8,880,720
Previous report
6,842,367
Avg daily volume
1,914,574
Days to cover
4.6

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-03-05HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAYPurchase (P)Common Stock7,200USD 43.08USD 310,176SEC filing ↗
2026-03-04HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAYPurchase (P)Common Stock7,200USD 43.38USD 312,336SEC filing ↗
2026-03-04HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAYPurchase (P)Common Stock7,200USD 43.38USD 312,336SEC filing ↗
2025-12-12HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAYPurchase (P)Common Stock2,439USD 41.00USD 99,999SEC filing ↗
2025-10-03HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAYPurchase (P)Common Stock2USD 41.97USD 84SEC filing ↗
2025-09-26HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAYPurchase (P)Common Stock4USD 41.76USD 167SEC filing ↗
2025-08-28HORIZON KINETICS ASSET MANAGEMENT LLC; STAHL MURRAYPurchase (P)Common Stock34,470USD 36.10USD 1,244,367SEC filing ↗
2025-08-14Emmons LancePurchase (P)Common Stock4USD 31.44USD 126SEC filing ↗
2025-08-13Stahlin PaulPurchase (P)Common Stock1,000USD 23.00USD 23,000SEC filing ↗
2025-08-13Smollen JohnPurchase (P)Common Stock5,000USD 23.00USD 115,000SEC filing ↗
2025-08-13Nazarali JamilPurchase (P)Common Stock2,500USD 23.00USD 57,500SEC filing ↗
2025-08-13Moore LisaPurchase (P)Common Stock5,500USD 23.00USD 126,500SEC filing ↗
2025-08-13Massad Mark I.Purchase (P)Common Stock8,000USD 23.00USD 184,000SEC filing ↗
2025-08-13Lozier Kenneth W.Purchase (P)Common Stock1,000USD 23.00USD 23,000SEC filing ↗
2025-08-13Jayabalan HarishPurchase (P)Common Stock2,500USD 23.00USD 57,500SEC filing ↗

Form 4 evidence

202 transaction lines in the latest 365-day window; 258 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-02Schafer Douglas M. JRSale (S)Common Stock40,000USD 33.34USD 1,333,600SEC filing ↗
2026-10-02Schafer Douglas M. JROption exercise / conversion (M)Common Stock40,000USD 12.00USD 480,000SEC filing ↗
2026-09-25Jayabalan HarishOption exercise / conversion (M)Common Stock8,333USD 12.00USD 99,996SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-02Schafer Douglas M. JRSale (S)Common Stock40,000USD 33.34USD 1,333,600SEC filing ↗
2026-10-02Schafer Douglas M. JROption exercise / conversion (M)Common Stock40,000USD 12.00USD 480,000SEC filing ↗
2026-09-25Jayabalan HarishOption exercise / conversion (M)Common Stock8,333USD 12.00USD 99,996SEC filing ↗
2026-09-16Brown ShellySale (S)Common Stock21,217USD 38.61USD 819,188SEC filing ↗
2026-09-11Brown ShellyTax withholding (F)Common Stock16,283USD 42.54USD 692,679SEC filing ↗
2026-09-03Gallagher Thomas P.Sale (S)Common Stock47,000USD 42.43USD 1,994,210SEC filing ↗
2026-09-03Gallagher Thomas P.Option exercise / conversion (M)Common Stock89,603USD 12.99USD 1,163,972SEC filing ↗
2026-09-03Deitzel EdwardSale (S)Common Stock11,000USD 42.21USD 464,310SEC filing ↗
2026-09-03Deitzel EdwardOption exercise / conversion (M)Common Stock11,000USD 12.00USD 132,000SEC filing ↗
2026-09-02Teekell Judson GraySale (S)Common Stock8,545USD 41.34USD 353,231SEC filing ↗
2026-09-02Schafer Douglas M. JRSale (S)Common Stock48,000USD 40.48USD 1,943,040SEC filing ↗
2026-09-02Schafer Douglas M. JROption exercise / conversion (M)Common Stock48,000USD 12.00USD 576,000SEC filing ↗
2026-09-02Comly Barbara J.Sale (S)Common Stock44,445USD 40.49USD 1,799,578SEC filing ↗
2026-09-02Comly Barbara J.Option exercise / conversion (M)Common Stock44,445USD 12.00USD 533,340SEC filing ↗
2026-08-19Gallagher Thomas P.Sale (S)Common Stock149,700USD 41.13USD 6,157,161SEC filing ↗
2026-08-18Gallagher Thomas P.Tax withholding (F)Common Stock150,300USD 42.41USD 6,374,223SEC filing ↗
2026-08-18Comly Barbara J.Tax withholding (F)Common Stock43,420USD 42.41USD 1,841,442SEC filing ↗
2026-08-17Schwarzkopf CynthiaSale (S)Common Stock5,000USD 42.85USD 214,250SEC filing ↗
2026-08-17Schwarzkopf CynthiaOption exercise / conversion (M)Common Stock5,000USD 12.00USD 60,000SEC filing ↗
2026-08-17Emmons LanceSale (S)Common Stock35,000USD 42.83USD 1,499,050SEC filing ↗
2026-08-04Teekell Judson GraySale (S)Common Stock3,000USD 45.79USD 137,370SEC filing ↗
2026-08-04Schafer Douglas M. JRSale (S)Common Stock48,000USD 45.71USD 2,194,080SEC filing ↗
2026-08-04Schafer Douglas M. JROption exercise / conversion (M)Common Stock48,000USD 12.00USD 576,000SEC filing ↗
2026-08-04Jayabalan HarishSale (S)Common Stock20,000USD 45.90USD 918,000SEC filing ↗
2026-08-04Jayabalan HarishOption exercise / conversion (M)Common Stock20,000USD 12.94USD 258,779SEC filing ↗
2026-08-04Gallagher Thomas P.Sale (S)Common Stock48,334USD 45.69USD 2,208,380SEC filing ↗
2026-08-04Gallagher Thomas P.Option exercise / conversion (M)Common Stock48,334USD 12.00USD 580,008SEC filing ↗
2026-08-04Eckert Kurt M.Sale (S)Common Stock1,063USD 45.80USD 48,685SEC filing ↗
2026-08-04Eckert Kurt M.Option exercise / conversion (M)Common Stock1,063USD 12.00USD 12,756SEC filing ↗
2026-08-04Deitzel EdwardSale (S)Common Stock11,000USD 45.78USD 503,580SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerMIAX
CIK0001438472
SectorFinancial Services
IndustryCapital Markets Yahoo Finance
SEC SIC6211 Security Brokers, Dealers & Flotation Companies
ExchangeNYSE

Data coverage

Local Form 4 history258 transaction lines from 2025-08-13 to 2026-10-02
20 P purchase lines · 69 S sale lines · 169 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.