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/MREO/capital-change-brief"
Use Arkolith's capital_change_brief for MREO. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Rubric Capital Management LP | $5.1M | 15.3M | —Held | Q1 2026 | |
| 2 | EcoR1 Capital, LLC | $4.4M | 13.4M | ▲+70% Added · +5.5M sh | Q1 2026 | |
| 3 | 683 Capital Management, LLC | $4.0M | 12.0M | ▼−20% Reduced · −3.0M sh | Q1 2026 | |
| 4 | BANK OF AMERICA CORP /DE/ | $2.7M | 8.2M | ▲321× Added · +8.2M sh | Q1 2026 | |
| 5 | Defilade Capital Management, L.P. | $2.5M | 7.6M | ▲New +7.6M sh | Q1 2026 | |
| 6 | Newtyn Management, LLC | $2.3M | 7.1M | ▲32× Added · +6.9M sh | Q1 2026 | |
| 7 | MILLENNIUM MANAGEMENT LLC | $1.2M | 3.6M | ▲43× Added · +3.5M sh | Q1 2026 | |
| 8 | UBS Group AG | $492K | 1.5M | ▼−4.4% Reduced · −69K sh | Q1 2026 | |
| 9 | Wealthspire Advisors, LLC | $263K | 796K | ▲New +796K sh | Q1 2026 | |
| 10 | MARSHALL WACE, LLP | $227K | 687K | ▲New +687K sh | Q1 2026 | |
| 11 | GROUP ONE TRADING LLC | $111K | 336K | ▼−24% Reduced · −106K sh | Q1 2026 | |
| 12 | Rangeley Capital, LLC | $109K | 329K | ▼−9.6% Reduced · −35K sh | Q1 2026 | |
| 13 | BlackRock, Inc. | $100K | 303K | ▼−3.1% Reduced · −10K sh | Q1 2026 | |
| 14 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $65K | 196K | ▲Added Added · +196K sh | Q1 2026 | |
| 15 | TWO SIGMA INVESTMENTS, LP | $62K | 188K | ▼−64% Reduced · −337K sh | Q1 2026 | |
| 16 | ADAR1 Capital Management, LLC | $50K | 150K | —Held | Q1 2026 | |
| 17 | JANE STREET GROUP, LLC | $46K | 140K | ▼−61% Reduced · −216K sh | Q1 2026 | |
| 18 | STATE STREET CORP | $44K | 133K | ▲+2.1% Added · +3K sh | Q1 2026 | |
| 19 | GEODE CAPITAL MANAGEMENT, LLC | $31K | 93K | —Held | Q1 2026 | |
| 20 | XTX Topco Ltd | $28K | 84K | ▲New +84K sh | Q1 2026 | |
| 21 | Caption Management, LLC | $21K | 64K | ▲+28% Added · +14K sh | Q1 2026 | |
| 22 | RENAISSANCE TECHNOLOGIES LLC | $16K | 48K | ▼−75% Reduced · −146K sh | Q1 2026 | |
| 23 | StoneX Group Inc. | $12K | 37K | ▲New +37K sh | Q1 2026 | |
| 24 | Centiva Capital, LP | $8K | 25K | —Held | Q1 2026 | |
| 25 | Engineers Gate Manager LP | $8K | 24K | ▼−52% Reduced · −26K 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 |
|---|---|---|---|---|---|
| Feb 26, 2026 | WYZGA MICHAEL S | Director | Grant (A) | 66K | $0 |
| Feb 26, 2026 | PAKIANATHAN DEEPIKA | Director | Grant (A) | 66K | $0 |
| Feb 26, 2026 | Ekblom Anders | Director | Grant (A) | 66K | $0 |
| Feb 26, 2026 | Ekblom Anders | Director | Grant (A) | 134K | — |
| Feb 26, 2026 | Shames Daniel | Director | Grant (A) | 66K | $0 |
| Feb 26, 2026 | Shames Daniel | Director | Grant (A) | 96K | — |
| Feb 26, 2026 | Yoskowitz Marc J | Director | Grant (A) | 96K | — |
| Feb 26, 2026 | Yoskowitz Marc J | Director | Grant (A) | 66K | $0 |
| Feb 26, 2026 | Jacquet Pierre | Director | Grant (A) | 107K | — |
| Feb 26, 2026 | Jacquet Pierre | Director | Grant (A) | 66K | $0 |
| Feb 26, 2026 | Jenkins Annalisa | Director | Grant (A) | 107K | — |
| Feb 26, 2026 | Jenkins Annalisa | Director | Grant (A) | 66K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 18 funds | $2.9B |
| ELI LILLY & COLLY | 18 funds | $1.1B |
| UNITEDHEALTH GROUP INCUNH | 18 funds | $534.3M |
| CAPITAL ONE FINANCIAL CORPCOF | 18 funds | $305.3M |
| MICROSOFT CORPMSFT | 17 funds | $3.8B |
| ALPHABET INC-CL AGOOGL | 17 funds | $2.6B |
| BROADCOM INCAVGO | 17 funds | $1.8B |
| TESLA INCTSLA | 17 funds | $1.1B |
| VISA INC-CLASS A SHARESV | 17 funds | $947.6M |
| COSTCO WHOLESALE CORPCOST | 17 funds | $758.0M |
| ADVANCED MICRO DEVICESAMD | 17 funds | $592.4M |
| CATERPILLAR INCCAT | 17 funds | $440.1M |
Ranked by how many of MREO'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 MREO. 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.