190 tracked 13F filers disclose a position in MIAX as of the latest SEC 13F filings, a combined $1.9B in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | HORIZON KINETICS ASSET MANAGEMENT LLC | $291.4M | 7.8M | ▲+127% Added · +4.4M sh | Q2 2026 | |
| 2 | T. Rowe Price Investment Management, Inc. | Withheld | 4.1M | ▲+37% Added · +1.1M sh | Q1 2026 | |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $128.3M | 3.3M | ▲+0.3% Added · +11K sh | Q1 2026 | |
| 4 | BlackRock, Inc. | $86.9M | 2.2M | ▲+27% Added · +479K sh | Q1 2026 | |
| 5 | BLAIR WILLIAM & CO/IL | $65.8M | 1.8M | ▲+166% Added · +1.1M sh | Q2 2026 | |
| 6 | CITADEL ADVISORS LLC | $62.6M | 1.6M | ▲+159% Added · +988K sh | Q1 2026 | |
| 7 | Alyeska Investment Group, L.P. | $56.3M | 1.4M | ▲+13% Added · +161K sh | Q1 2026 | |
| 8 | STATE STREET CORP | $53.2M | 1.4M | ▲+101% Added · +721K sh | Q2 2026 | |
| 9 | VANGUARD CAPITAL MANAGEMENT LLC | $55.1M | 1.4M | →First observed position No prior filed position | Q1 2026 | |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $51.9M | 1.4M | ▲+79% Added · +616K sh | Q2 2026 | |
| 11 | VANGUARD PORTFOLIO MANAGEMENT LLC | $53.5M | 1.4M | →First observed position No prior filed position | Q1 2026 | |
| 12 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $48.5M | 1.2M | ▲+41% Added · +366K sh | Q1 2026 | |
| 13 | JPMORGAN CHASE & CO | $46.4M | 1.2M | ▲+52% Added · +424K sh | Q1 2026 | |
| 14 | AMERICAN CENTURY COMPANIES INC | $47.5M | 1.2M | ▼−16% Reduced · −227K sh | Q1 2026 | |
| 15 | MORGAN STANLEY | $44.6M | 1.1M | ▲+419% Added · +926K sh | Q1 2026 | |
| 16 | North Reef Capital Management LP | $39.5M | 1.0M | ▼−20% Reduced · −251K sh | Q1 2026 | |
| 17 | BANK OF AMERICA CORP /DE/ | $35.1M | 901K | ▲+196% Added · +597K sh | Q1 2026 | |
| 18 | TWO SIGMA INVESTMENTS, LP | $34.8M | 894K | ▲+537% Added · +753K sh | Q1 2026 | |
| 19 | Allspring Global Investments Holdings, LLC | $33.5M | 858K | ▼−23% Reduced · −255K sh | Q2 2026 | |
| 20 | Walleye Capital LLC | $27.1M | 728K | ▲19× Added · +690K sh | Q2 2026 | |
| 21 | WESTFIELD CAPITAL MANAGEMENT CO LP | $26.0M | 701K | ▲New +701K sh | Q2 2026 | |
| 22 | NewEdge Advisors, LLC | $25.3M | 682K | ▲17× Added · +643K sh | Q2 2026 | |
| 23 | Caldwell Investment Management Ltd. | $22.3M | 600K | ▼−9.6% Reduced · −64K sh | Q2 2026 | |
| 24 | BNP PARIBAS FINANCIAL MARKETS | $22.3M | 572K | ▲+200% Added · +381K sh | Q1 2026 | |
| 25 | FRANKLIN RESOURCES INC | $22.1M | 568K | ▲+33% Added · +141K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 18 funds opened a new position in MIAX and 28 added to an existing one, while 15 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 105 funds | $138.9B |
| ALPHABET INC-CL AGOOGL | 103 funds | $110.8B |
| MICROSOFT CORPMSFT | 102 funds | $192.5B |
| NVIDIA CORPNVDA | 101 funds | $277.1B |
| APPLE INCAAPL | 100 funds | $204.6B |
| META PLATFORMS INC-CLASS AMETA | 100 funds | $76.9B |
| JPMORGAN CHASE & COJPM | 98 funds | $44.8B |
| VISA INC-CLASS A SHARESV | 98 funds | $42.2B |
| BANK OF AMERICA CORPBAC | 98 funds | $21.8B |
| ALPHABET INC-CL CGOOG | 96 funds | $90.4B |
| MICRON TECHNOLOGY INCMU | 96 funds | $27.4B |
| BROADCOM INCAVGO | 94 funds | $112.3B |
Ranked by how many of MIAX's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 19, 2026 | Gallagher Thomas P. | Chairman & CEO, Director | Sell (S) | 150K | $6.2M |
| Aug 17, 2026 | Emmons Lance | EVP and CFO | Sell (S) | 35K | $1.5M |
| Aug 17, 2026 | Schwarzkopf Cynthia | Director | Sell (S) | 5K | $214K |
| Aug 4, 2026 | Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | Sell (S) | 11K | $504K |
| Aug 4, 2026 | Schafer Douglas M. JR | EVP and CIO | Sell (S) | 48K | $2.2M |
| Aug 4, 2026 | Gallagher Thomas P. | Chairman & CEO, Director | Sell (S) | 48K | $2.2M |
| Aug 4, 2026 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell (S) | 44K | $2.0M |
| Aug 4, 2026 | Eckert Kurt M. | Director | Sell (S) | 1K | $49K |
| Aug 4, 2026 | Jayabalan Harish | EVP, CISO and CRO | Sell (S) | 20K | $918K |
| Aug 4, 2026 | Teekell Judson Gray | Director | Sell (S) | 3K | $137K |
| Jul 15, 2026 | Schwarzkopf Cynthia | Director | Sell (S) | 5K | $210K |
| Jul 13, 2026 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell (S) | 28K | $1.2M |
Connected entities for MIAX
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/MIAX/capital-change-brief"
Use Arkolith's capital_change_brief for MIAX. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for MIAX. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.