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/MKTX/capital-change-brief"
Use Arkolith's capital_change_brief for MKTX. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $672.3M | 4.1M | ▲+8.8% Added · +329K sh | Q1 2026 | |
| 2 | PRIMECAP MANAGEMENT CO/CA/ | $552.2M | 3.3M | ▲+5.4% Added · +172K sh | Q1 2026 | |
| 3 | AQR CAPITAL MANAGEMENT LLC | $442.8M | 2.7M | ▲+4.9% Added · +126K sh | Q1 2026 | |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | $357.0M | 2.2M | ▲New +2.2M sh | Q1 2026 | |
| 5 | North Reef Capital Management LP | $309.3M | 1.9M | ▲+17% Added · +266K sh | Q1 2026 | |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | $265.5M | 1.6M | ▲New +1.6M sh | Q1 2026 | |
| 7 | FMR LLC | $250.7M | 1.5M | ▼−24% Reduced · −485K sh | Q1 2026 | |
| 8 | STATE STREET CORP | $211.3M | 1.3M | ▲+2.6% Added · +33K sh | Q1 2026 | |
| 9 | VAN ECK ASSOCIATES CORP | Withheld | 1.2M | ▲+2.0% Added · +24K sh | Q1 2026 | |
| 10 | MILLENNIUM MANAGEMENT LLC | $179.4M | 1.1M | ▲+260% Added · +786K sh | Q1 2026 | |
| 11 | BANK OF MONTREAL /CAN/ | $168.4M | 1.0M | ▲+7.3% Added · +70K sh | Q1 2026 | |
| 12 | Neuberger Berman Group LLC | $159.4M | 966K | ▲+76% Added · +416K sh | Q1 2026 | |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | $142.4M | 863K | ▲+3.6% Added · +30K sh | Q1 2026 | |
| 14 | GUARDCAP ASSET MANAGEMENT Ltd | $106.4M | 643K | ▼−44% Reduced · −510K sh | Q1 2026 | |
| 15 | DIMENSIONAL FUND ADVISORS LP | $95.9M | 581K | ▲+10% Added · +55K sh | Q1 2026 | |
| 16 | TWO SIGMA INVESTMENTS, LP | $86.5M | 524K | ▼−1.8% Reduced · −10K sh | Q1 2026 | |
| 17 | GOLDMAN SACHS GROUP INC | $84.0M | 509K | ▲+195% Added · +336K sh | Q1 2026 | |
| 18 | NORGES BANK | $91.3M | 504K | ▼−1.8% Reduced · −9K sh | Q4 2025 | |
| 19 | MORGAN STANLEY | $80.9M | 491K | ▲+15% Added · +66K sh | Q1 2026 | |
| 20 | Findlay Park Partners LLP | $79.3M | 481K | ▼−10% Reduced · −56K sh | Q1 2026 | |
| 21 | JPMORGAN CHASE & CO | $71.3M | 433K | ▼−21% Reduced · −113K sh | Q1 2026 | |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $55.8M | 339K | ▲+6.3% Added · +20K sh | Q1 2026 | |
| 23 | Walleye Capital LLC | $54.9M | 333K | ▲+97% Added · +164K sh | Q1 2026 | |
| 24 | BNP PARIBAS FINANCIAL MARKETS | $52.7M | 319K | ▼−15% Reduced · −56K sh | Q1 2026 | |
| 25 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $48.7M | 295K | ▲+2.3% Added · +7K 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 10, 2026 | Pintoff Scott | General Counsel and Secretary | Sell (S) | 100 | $12K |
| Jun 18, 2026 | HERNANDEZ CARLOS MAURICIO | Director | Gift (G) | 11K | $0 |
| Jun 18, 2026 | HERNANDEZ CARLOS MAURICIO | Director | Gift (G) | 11K | $0 |
| Jun 10, 2026 | Pintoff Scott | General Counsel and Secretary | Sell (S) | 100 | $12K |
| Jun 10, 2026 | Portney Emily Hope | Director | Grant (A) | 1K | $0 |
| Jun 10, 2026 | SCHICIANO KENNETH T | Director | Grant (A) | 1K | $0 |
| Jun 10, 2026 | KETCHUM RICHARD G | Director | Grant (A) | 1K | $0 |
| Jun 10, 2026 | Hoornweg Roberto | Director | Grant (A) | 1K | $0 |
| Jun 10, 2026 | HERNANDEZ CARLOS MAURICIO | Director | Grant (A) | 3K | $0 |
| Jun 10, 2026 | Cifu Douglas A | Director | Grant (A) | 1K | $0 |
| Jun 10, 2026 | Chwick Jane | Director | Grant (A) | 1K | $0 |
| Jun 10, 2026 | Gibson Kourtney | Director | Grant (A) | 1K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 158 funds | $65.1B |
| NVIDIA CORPNVDA | 154 funds | $94.9B |
| ALPHABET INC-CL AGOOGL | 154 funds | $43.8B |
| BROADCOM INCAVGO | 154 funds | $33.2B |
| AMAZON.COM INCAMZN | 153 funds | $52.5B |
| META PLATFORMS INC-CLASS AMETA | 153 funds | $31.1B |
| ELI LILLY & COLLY | 152 funds | $17.0B |
| VISA INC-CLASS A SHARESV | 151 funds | $14.6B |
| MASTERCARD INC - AMA | 151 funds | $11.8B |
| APPLE INCAAPL | 150 funds | $77.7B |
| JPMORGAN CHASE & COJPM | 150 funds | $20.5B |
| CITIGROUP INCC | 150 funds | $5.6B |
Ranked by how many of MKTX'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 MKTX. 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.