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.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | T. Rowe Price Investment Management, Inc. | Withheld | 4.1M | ▲+37% Added · +1.1M sh | Q1 2026 | |
| 2 | HORIZON KINETICS ASSET MANAGEMENT LLC | $134.3M | 3.5M | ▲+90% Added · +1.6M 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 | CITADEL ADVISORS LLC | $62.6M | 1.6M | ▲+159% Added · +988K sh | Q1 2026 | |
| 6 | Alyeska Investment Group, L.P. | $56.3M | 1.4M | ▲+13% Added · +161K sh | Q1 2026 | |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | $55.1M | 1.4M | ▲New +1.4M sh | Q1 2026 | |
| 8 | VANGUARD PORTFOLIO MANAGEMENT LLC | $53.5M | 1.4M | ▲New +1.4M sh | Q1 2026 | |
| 9 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $48.5M | 1.2M | ▲+41% Added · +366K sh | Q1 2026 | |
| 10 | JPMORGAN CHASE & CO | $46.4M | 1.2M | ▲+52% Added · +424K sh | Q1 2026 | |
| 11 | AMERICAN CENTURY COMPANIES INC | $47.5M | 1.2M | ▼−16% Reduced · −227K sh | Q1 2026 | |
| 12 | MORGAN STANLEY | $44.6M | 1.1M | ▲+419% Added · +926K sh | Q1 2026 | |
| 13 | Allspring Global Investments Holdings, LLC | $43.8M | 1.1M | ▲+19% Added · +180K sh | Q1 2026 | |
| 14 | North Reef Capital Management LP | $39.5M | 1.0M | ▼−20% Reduced · −251K sh | Q1 2026 | |
| 15 | Ghisallo Capital Management LLC | $38.9M | 1.0M | ▲+79% Added · +443K sh | Q1 2026 | |
| 16 | BANK OF AMERICA CORP /DE/ | $35.1M | 901K | ▲+196% Added · +597K sh | Q1 2026 | |
| 17 | TWO SIGMA INVESTMENTS, LP | $34.8M | 894K | ▲+537% Added · +753K sh | Q1 2026 | |
| 18 | GEODE CAPITAL MANAGEMENT, LLC | $30.4M | 780K | ▲+52% Added · +267K sh | Q1 2026 | |
| 19 | STATE STREET CORP | $27.7M | 712K | ▲+24% Added · +136K sh | Q1 2026 | |
| 20 | BLAIR WILLIAM & CO/IL | $25.9M | 666K | ▲+1.7% Added · +11K sh | Q1 2026 | |
| 21 | BNP PARIBAS FINANCIAL MARKETS | $22.3M | 572K | ▲+200% Added · +381K sh | Q1 2026 | |
| 22 | FRANKLIN RESOURCES INC | $22.1M | 568K | ▲+33% Added · +141K sh | Q1 2026 | |
| 23 | SEI INVESTMENTS CO | $20.5M | 526K | ▲+55% Added · +186K sh | Q1 2026 | |
| 24 | MILLENNIUM MANAGEMENT LLC | $20.2M | 519K | ▲+82% Added · +234K sh | Q1 2026 | |
| 25 | AMERIPRISE FINANCIAL INC | $19.8M | 509K | ▲+14% Added · +62K 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.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jul 15, 2026 | Schwarzkopf Cynthia | Director | Option exercise (M) | 5K | $0 |
| Jul 15, 2026 | Schwarzkopf Cynthia | Director | Sell (S) | 5K | $210K |
| Jul 15, 2026 | Schwarzkopf Cynthia | Director | Option exercise (M) | 5K | $60K |
| Jul 13, 2026 | Gallagher Thomas P. | Chairman & CEO, Director | Option exercise (M) | 70K | $0 |
| Jul 13, 2026 | Gallagher Thomas P. | Chairman & CEO, Director | Sell (S) | 70K | $3.0M |
| Jul 13, 2026 | Gallagher Thomas P. | Chairman & CEO, Director | Option exercise (M) | 70K | $840K |
| Jul 13, 2026 | Comly Barbara J. | EVP, GC & Corporate Secretary | Option exercise (M) | 28K | $0 |
| Jul 13, 2026 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell (S) | 28K | $1.2M |
| Jul 13, 2026 | Comly Barbara J. | EVP, GC & Corporate Secretary | Option exercise (M) | 28K | $336K |
| Jul 8, 2026 | BROWN DAVID A | Director | Tax withholding (F) | 171 | $7K |
| Jul 7, 2026 | Gallagher Thomas P. | Chairman & CEO, Director | Option exercise (M) | 28K | $339K |
| Jul 7, 2026 | Gallagher Thomas P. | Chairman & CEO, Director | Sell (S) | 28K | $1.2M |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 59 funds | $19.2B |
| NVIDIA CORPNVDA | 57 funds | $29.4B |
| ELI LILLY & COLLY | 57 funds | $5.2B |
| AMAZON.COM INCAMZN | 56 funds | $16.1B |
| BROADCOM INCAVGO | 56 funds | $10.3B |
| META PLATFORMS INC-CLASS AMETA | 56 funds | $8.9B |
| TESLA INCTSLA | 56 funds | $6.6B |
| APPLE INCAAPL | 55 funds | $21.6B |
| ALPHABET INC-CL AGOOGL | 55 funds | $12.9B |
| VISA INC-CLASS A SHARESV | 55 funds | $4.1B |
| MASTERCARD INC - AMA | 55 funds | $3.9B |
| NETFLIX INCNFLX | 55 funds | $3.0B |
Ranked by how many of MIAX's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
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. Every panel above is one call to the Arkolith API & MCP server.