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 MBIO 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/MBIO"
Use Arkolith to show who owns MBIO, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Kestra Advisory Services, LLC | $128K | 176K | ▲+59% Added · +65K sh | Q1 2026 | |
| 2 | GEODE CAPITAL MANAGEMENT, LLC | $68K | 93K | ▲+187% Added · +61K sh | Q1 2026 | |
| 3 | BlackRock, Inc. | $62K | 85K | —Held | Q1 2026 | |
| 4 | VANGUARD GROUP INC | $57K | 58K | —Held | Q4 2025 | |
| 5 | CITADEL ADVISORS LLC | $39K | 53K | ▼−37% Reduced · −32K sh | Q1 2026 | |
| 6 | VANGUARD FIDUCIARY TRUST CO | $23K | 32K | ▲New +32K sh | Q1 2026 | |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | $19K | 26K | ▲New +26K sh | Q1 2026 | |
| 8 | TWO SIGMA INVESTMENTS, LP | $12K | 17K | ▼−58% Reduced · −23K sh | Q1 2026 | |
| 9 | UBS Group AG | $3K | 4K | ▲83× Added · +4K sh | Q1 2026 | |
| 10 | Tower Research Capital LLC (TRC) | $1K | 2K | ▲+102% Added · +959 sh | Q1 2026 | |
| 11 | SBI Securities Co., Ltd. | $371 | 509 | ▼−75% Reduced · −2K sh | Q1 2026 | |
| 12 | MORGAN STANLEY | $86 | 118 | ▼−23% Reduced · −35 sh | Q1 2026 | |
| 13 | CULLEN/FROST BANKERS, INC. | $9 | 13 | —Held | Q1 2026 | |
| 14 | BNP PARIBAS FINANCIAL MARKETS | $4 | 6 | —Held | Q1 2026 | |
| 15 | MAI Capital Management | $3 | 3 | —Held | Q1 2026 | |
| 16 | JPMORGAN CHASE & CO | $1 | 2 | —Held | Q1 2026 | |
| 17 | CITIGROUP INC | $1 | 1 | ▲New +1 sh | Q1 2026 | |
| 18 | OSAIC HOLDINGS, INC. | $1 | 2 | ▲New +2 sh | Q1 2026 | |
| 19 | GROUP ONE TRADING LLC | $1 | 1 | —Held | Q1 2026 | |
| 20 | DANSKE BANK A/S | $1 | 2 | —Held | Q1 2026 | |
| 21 | CWM, LLC | $1 | 2 | —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 |
|---|---|---|---|---|---|
| Jan 2, 2026 | Fortress Biotech, Inc. | 10% Owner | Grant (A) | 278K | $0 |
| Dec 30, 2025 | Jin David | Director | Buy (P) | 247 | $237 |
| Dec 30, 2025 | Chill Adam J. | Director | Sell (S) | 4 | $4 |
| Dec 30, 2025 | Herskowitz Neil | Director | Sell (S) | 247 | $237 |
| Sep 29, 2025 | Fortress Biotech, Inc. | 10% Owner | Grant (A) | 59K | $0 |
| Apr 24, 2025 | Litchman Manuel MD | President, CEO and Interim CFO, Director | Tax withholding (F) | 27 | $33 |
| Mar 31, 2025 | Fortress Biotech, Inc. | 10% Owner | Grant (A) | 68K | $0 |
| Jun 27, 2024 | Fortress Biotech, Inc. | 10% Owner | Grant (A) | 575K | $0 |
| May 31, 2024 | Litchman Manuel MD | President and CEO, Director | Tax withholding (F) | 1K | $489 |
| Jan 2, 2024 | Fortress Biotech, Inc. | 10% Owner | Grant (A) | 419K | $0 |
| Jul 5, 2023 | ZELEFSKY MICHAEL J | Director | Grant (A) | 7K | $0 |
| Jul 5, 2023 | WEISS MICHAEL S | Director | Grant (A) | 7K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 9 funds | $4.9B |
| MICROSOFT CORPMSFT | 9 funds | $4.7B |
| ALPHABET INC-CL AGOOGL | 9 funds | $3.2B |
| BROADCOM INCAVGO | 9 funds | $2.7B |
| META PLATFORMS INC-CLASS AMETA | 9 funds | $2.5B |
| MICRON TECHNOLOGY INCMU | 9 funds | $2.1B |
| JPMORGAN CHASE & COJPM | 9 funds | $2.0B |
| TESLA INCTSLA | 9 funds | $2.0B |
| TAIWAN SEMICONDUCTOR-SP ADRTSM | 9 funds | $1.7B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 9 funds | $1.6B |
| JOHNSON & JOHNSONJNJ | 9 funds | $1.5B |
| ELI LILLY & COLLY | 9 funds | $1.4B |
Ranked by how many of MBIO'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 MBIO. 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.