The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This stock page is the Follow view. The Build view lets your agent query MRKR owners, fund changes, insider filings, and source links through REST or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/MRKR"
Use Arkolith to show who owns MRKR, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | NEA Management Company, LLC | $2.1M | 1.6M | —Held | Q1 2026 | |
| 2 | VANGUARD GROUP INC | $516K | 346K | ▲+15% Added · +46K sh | Q4 2025 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $506K | 389K | ▲New +389K sh | Q1 2026 | |
| 4 | RENAISSANCE TECHNOLOGIES LLC | $228K | 175K | ▲+42% Added · +52K sh | Q1 2026 | |
| 5 | GEODE CAPITAL MANAGEMENT, LLC | $209K | 161K | ▲+23% Added · +31K sh | Q1 2026 | |
| 6 | OSAIC HOLDINGS, INC. | $121K | 93K | ▼−1.4% Reduced · −1K sh | Q1 2026 | |
| 7 | VANGUARD FIDUCIARY TRUST CO | $113K | 87K | ▲New +87K sh | Q1 2026 | |
| 8 | LPL Financial LLC | $108K | 83K | ▼−0.2% Reduced · −200 sh | Q1 2026 | |
| 9 | XTX Topco Ltd | $83K | 64K | ▲+9.5% Added · +6K sh | Q1 2026 | |
| 10 | TWO SIGMA INVESTMENTS, LP | $79K | 61K | ▼−38% Reduced · −37K sh | Q1 2026 | |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $63K | 49K | ▲New +49K sh | Q1 2026 | |
| 12 | JANE STREET GROUP, LLC | $47K | 36K | ▼−10% Reduced · −4K sh | Q1 2026 | |
| 13 | UBS Group AG | $42K | 32K | ▼−81% Reduced · −142K sh | Q1 2026 | |
| 14 | NORTHERN TRUST CORP | $34K | 26K | —Held | Q1 2026 | |
| 15 | STATE STREET CORP | $27K | 21K | —Held | Q1 2026 | |
| 16 | Creative Planning | $23K | 17K | —Held | Q1 2026 | |
| 17 | Ashton Thomas Private Wealth, LLC | $21K | 16K | ▲+64% Added · +6K sh | Q1 2026 | |
| 18 | FIFTH THIRD BANCORP | $13K | 10K | —Held | Q1 2026 | |
| 19 | Tower Research Capital LLC (TRC) | $4K | 3K | ▲+339% Added · +2K sh | Q1 2026 | |
| 20 | WELLS FARGO & COMPANY/MN | $302 | 232 | ▼−4.1% Reduced · −10 sh | Q1 2026 | |
| 21 | SIGNATUREFD, LLC | $296 | 228 | ▲New +228 sh | Q1 2026 | |
| 22 | SBI Securities Co., Ltd. | $264 | 203 | —Held | Q1 2026 | |
| 23 | GROUP ONE TRADING LLC | $231 | 178 | —Held | Q1 2026 | |
| 24 | BNP PARIBAS FINANCIAL MARKETS | $30 | 23 | —Held | Q1 2026 | |
| 25 | JPMORGAN CHASE & CO | $29 | 23 | —Held | 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 |
|---|---|---|---|---|---|
| Nov 17, 2025 | Knobil Katharine | Director | Grant (A) | 84K | $0 |
| Nov 17, 2025 | ELMS STEVE | Director | Grant (A) | 84K | $0 |
| Nov 17, 2025 | Eansor Norman David | Director | Grant (A) | 84K | $0 |
| Nov 17, 2025 | Eansor Norman David | Director | Grant (A) | 137K | $0 |
| Nov 17, 2025 | ELMS STEVE | Director | Grant (A) | 137K | $0 |
| Nov 17, 2025 | Knobil Katharine | Director | Grant (A) | 137K | $0 |
| Oct 31, 2025 | Corzo Kathryn Penkus | Director | Grant (A) | 148K | $0 |
| Oct 31, 2025 | Vera Juan | Chief Executive Officer, Director | Grant (A) | 250K | $0 |
| Feb 12, 2025 | Vera Juan | President and CEO, Director | Grant (A) | 50K | $0 |
| Feb 12, 2025 | Eansor Norman David | Director | Grant (A) | 30K | $0 |
| Feb 12, 2025 | Knobil Katharine | Director | Grant (A) | 30K | $0 |
| Feb 12, 2025 | ELMS STEVE | Director | Grant (A) | 30K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 5 funds | $1.9B |
| MICRON TECHNOLOGY INCMU | 5 funds | $1.6B |
| TAIWAN SEMICONDUCTOR-SP ADRTSM | 5 funds | $1.4B |
| MICROSOFT CORPMSFT | 5 funds | $1.2B |
| META PLATFORMS INC-CLASS AMETA | 5 funds | $1.1B |
| BROADCOM INCAVGO | 5 funds | $1.1B |
| ALPHABET INC-CL AGOOGL | 5 funds | $978.9M |
| TESLA INCTSLA | 5 funds | $897.7M |
| WARNER BROS DISCOVERY INCWBD | 5 funds | $814.0M |
| JPMORGAN CHASE & COJPM | 5 funds | $778.8M |
| NORFOLK SOUTHERN CORPNSC | 5 funds | $754.0M |
| BLACKROCK INCBLK | 5 funds | $692.1M |
Ranked by how many of MRKR'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 MRKR. 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.