Stocks › MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
MIAX·NYSE·
United States·USD
United States·USD$30.79
-3.53 (-10.29%)
Close · Oct 6, 2026 · Close Prices from Tiingo.com
MIAX
MIAMI INTERNATIONAL HOLDINGS, INC. · NYSE
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
MIAXS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
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Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of MIAX by members of U.S. Congress · 1 on record · 1 in the last 12 months
| Politician | Stock | Type | Filed | Traded | |
|---|---|---|---|---|---|
 Gilbert Ray Cisneros, Jr.House · D · CA |
MIAXMIAMI INTERNATIONAL HOLDINGS, INC. · Stock |
Purchase $15,001 - $50,000 |
Apr 7, 2026 | Mar 20, 2026 | Filing ↗ |
Whale Activity
Position changes in MIAX reported for 2026-06-30 by 11 tracked institutional filers
- Increased4
- New0
- Held0
- Decreased2
- Closed2
- No prior filing3
| Filer | Shares | Value | Change |
|---|---|---|---|
| BlackRock, Inc. | 5.1M | $188.5M | increased |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3.8M | $140.7M | increased |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.2M | $117.6M | increased |
| J Digital 6 LLC | 1.8M | $67.2M | — |
| TWO SIGMA INVESTMENTS, LP | 888.1K | $33.0M | decreased |
| D. E. Shaw & Co., Inc. | 355.5K | $13.2M | increased |
| MILLENNIUM MANAGEMENT LLC | 189.1K | $7.0M | decreased |
| Goodwin Investment Advisory | 28.0K | $1.0M | — |
| Bullseye Asset Management LLC | 98.2K | $4K | — |
| Citadel Advisors LLC | 0 | $0 | closed |
| Renaissance Technologies | 0 | $0 | closed |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by MIAX insiders, by quarter · Form 4
Recent Insider Transactions
234 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| Schafer Douglas M. JREVP and CIO | Sale | −40.0K | $33.34 | $1.3M | Oct 2, 2026 | Form 4 ↗ |
| Brown ShellyEVP, Chief Strategy Officer | Sale | −21.2K | $38.61 | $819K | Sep 16, 2026 | Form 4 ↗ |
| Deitzel EdwardEVP, CRO, CCO MIAX Exchanges | Sale | −11.0K | $42.21 | $464K | Sep 3, 2026 | Form 4 ↗ |
| Gallagher Thomas P.Chairman & CEO · Director | Sale | −47.0K | $42.43 | $2.0M | Sep 3, 2026 | Form 4 ↗ |
| Comly Barbara J.EVP, GC & Corporate Secretary | Sale | −44.4K | $40.49 | $1.8M | Sep 2, 2026 | Form 4 ↗ |
| Schafer Douglas M. JREVP and CIO | Sale | −48.0K | $40.48 | $1.9M | Sep 2, 2026 | Form 4 ↗ |
| Teekell Judson GrayDirector · Director | Sale | −5,545 | $41.58 | $231K | Sep 2, 2026 | Form 4 ↗ |
| Teekell Judson GrayDirector · Director | Sale | −3,000 | $40.89 | $123K | Sep 2, 2026 | Form 4 ↗ |
| Gallagher Thomas P.Chairman & CEO · Director | Sale | −149.7K | $41.13 | $6.2M | Aug 19, 2026 | Form 4 ↗ |
| Schwarzkopf CynthiaDirector · Director | Sale | −5,000 | $42.85 | $214K | Aug 17, 2026 | Form 4 ↗ |
| Emmons LanceEVP and CFO | Sale | −35.0K | $42.83 | $1.5M | Aug 17, 2026 | Form 4 ↗ |
| Comly Barbara J.EVP, GC & Corporate Secretary | Sale | −44.4K | $45.69 | $2.0M | Aug 4, 2026 | Form 4 ↗ |
| Eckert Kurt M.Director · Director | Sale | −1,063 | $45.80 | $49K | Aug 4, 2026 | Form 4 ↗ |
| Deitzel EdwardEVP, CRO, CCO MIAX Exchanges | Sale | −11.0K | $45.78 | $504K | Aug 4, 2026 | Form 4 ↗ |
| Jayabalan HarishEVP, CISO and CRO | Sale | −20.0K | $45.90 | $918K | Aug 4, 2026 | Form 4 ↗ |
| Gallagher Thomas P.Chairman & CEO · Director | Sale | −48.3K | $45.69 | $2.2M | Aug 4, 2026 | Form 4 ↗ |
| Schafer Douglas M. JREVP and CIO | Sale | −48.0K | $45.71 | $2.2M | Aug 4, 2026 | Form 4 ↗ |
| Teekell Judson GrayDirector · Director | Sale | −3,000 | $45.79 | $137K | Aug 4, 2026 | Form 4 ↗ |
| Schwarzkopf CynthiaDirector · Director | Sale | −5,000 | $42.00 | $210K | Jul 15, 2026 | Form 4 ↗ |
| Comly Barbara J.EVP, GC & Corporate Secretary | Sale | −28.0K | $41.98 | $1.2M | Jul 13, 2026 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding MIAX · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS | 2.7M | $100.7M | 0.00% | Jun 30, 2026 |
| iShares Russell 2000 ETF iShares Trust | 2.0M | $74.1M | 0.09% | Jun 30, 2026 |
| VANGUARD SMALL-CAP INDEX FUND VANGUARD INDEX FUNDS | 2.0M | $72.8M | 0.04% | Jun 30, 2026 |
| Small Cap Growth Fund American Century Mutual Funds, Inc. | 1.4M | $63.7M | 1.14% | Jul 31, 2026 |
| T. Rowe Price Small-Cap Stock Fund, Inc. | 1.5M | $54.3M | 0.58% | Jun 30, 2026 |
| VANGUARD SMALL-CAP VALUE INDEX FUND VANGUARD INDEX FUNDS | 1.2M | $46.1M | 0.07% | Jun 30, 2026 |
| Franklin Small Cap Growth Fund Franklin Strategic Series | 848.3K | $39.9M | 1.61% | Jul 31, 2026 |
| Fidelity Small Cap Index Fund Fidelity Salem Street Trust | 836.3K | $39.3M | 0.12% | Jul 31, 2026 |
| Horizon Kinetics Inflation Beneficiaries ETF Listed Funds Trust | 946.3K | $35.2M | 2.39% | Jun 30, 2026 |
| T. Rowe Price Institutional Small-Cap Stock Fund T. Rowe Price Equity Funds, Inc. | 778.5K | $28.9M | 0.58% | Jun 30, 2026 |
Mutual funds and ETFs whose N-PORT filings list MIAX's shares (CUSIP 59356Q108), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Activist & Passive Stakes
Schedule 13D / 13G beneficial-ownership filings
- T. Rowe Price Investment Management, Inc.SCHEDULE 13G · passive (13G) · 5.0M shares5.3%
Aug 14, 2026 · ↗ - BlackRock, Inc.SCHEDULE 13G · passive (13G) · 4.9M shares5.1%
Jul 29, 2026 · ↗ - Horizon Kinetics Holding CorpSCHEDULE 13D/A · activist (13D) · 7.4M shares7.8%
May 21, 2026 · ↗ - HORIZON KINETICS ASSET MANAGEMENT LLCSCHEDULE 13D/A · activist (13D) · 7.4M shares7.8%
May 21, 2026 · ↗ - Horizon Kinetics Holding CorpSCHEDULE 13D/A · activist (13D) · 11.2M shares12.2%
Apr 28, 2026 · ↗ - HORIZON KINETICS ASSET MANAGEMENT LLCSCHEDULE 13D/A · activist (13D) · 11.2M shares12.2%
Apr 28, 2026 · ↗
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming MIAMI INTERNATIONAL HOLDINGS, INC. as client
No lobbying filings found naming MIAMI INTERNATIONAL HOLDINGS, INC. as the client.
Government Contracts
Federal awards to MIAMI INTERNATIONAL HOLDINGS, INC. · USAspending
No federal contract awards found for MIAMI INTERNATIONAL HOLDINGS, INC..
U.S. Patents
Recent USPTO applications naming MIAMI INTERNATIONAL HOLDINGS, INC.
No USPTO patent applications found for MIAMI INTERNATIONAL HOLDINGS, INC..
Annual Financials
From MIAX's 10-K filings · XBRL
No annual XBRL figures on record for MIAX. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
No stock splits in MIAX's price history.
Material Events (8-K)
Corporate events filed with the SEC
- 8-K · Items 2.02, 9.01Results of operationsAug 5, 2026
EDGAR ↗ - 8-K · Items 8.01Other eventsJul 21, 2026
EDGAR ↗ - 8-K · Items 3.02Unregistered sale of equityJun 22, 2026
EDGAR ↗ - 8-K · Items 5.07Shareholder voteJun 18, 2026
EDGAR ↗ - 8-K · Items 5.02Officer / director changeJun 17, 2026
EDGAR ↗ - 8-K · Items 2.02, 9.01Results of operationsMay 6, 2026
EDGAR ↗
About MIAMI INTERNATIONAL HOLDINGS, INC.
From SEC EDGAR company records
Industry (SIC 6211)Security Brokers, Dealers & Flotation Companies
SectorFinancials
HeadquartersPRINCETON, NJ
IncorporatedDE
SEC CIK0001438472 ↗
Former namesMIAMI INTERNATIONAL HOLDINGS INC