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 MGRX 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/MGRX"
Use Arkolith to show who owns MGRX, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | VANGUARD FIDUCIARY TRUST CO | $21K | 57K | ▲New +57K sh | Q1 2026 | |
| 2 | BOOTHBAY FUND MANAGEMENT, LLC | $14K | 38K | —Held | Q1 2026 | |
| 3 | StoneX Group Inc. | $6K | 16K | ▲New +16K sh | Q1 2026 | |
| 4 | Csenge Advisory Group | $4K | 10K | —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 |
|---|---|---|---|---|---|
| Mar 16, 2026 | Tiger Cub Trust | 10% Owner | Disposed to issuer (D) | 50K | $0 |
| Mar 16, 2026 | Tiger Cub Trust | 10% Owner | Grant (A) | 83K | $0 |
| Mar 16, 2026 | Tiger Cub Trust | 10% Owner | Disposed to issuer (D) | 2.0M | $0 |
| Mar 16, 2026 | Tiger Cub Trust | 10% Owner | Grant (A) | 2.0M | $0 |
| Mar 16, 2026 | Tiger Cub Trust | 10% Owner | Grant (A) | 50K | $0 |
| Mar 16, 2026 | Tiger Cub Trust | 10% Owner | Disposed to issuer (D) | 83K | $0 |
| Dec 15, 2025 | JOHNSTON EUGENE M | CFO | Sell (S) | 3K | $4K |
| Dec 9, 2025 | JOHNSTON EUGENE M | CFO | Sell (S) | 5K | $6K |
| Dec 5, 2025 | JOHNSTON EUGENE M | CFO | Sell (S) | 10K | $11K |
| Nov 19, 2025 | Hamilton Alex P. | Director | Sell (S) | 125K | $153K |
| Sep 9, 2025 | Hamilton Alex P. | Director | Grant (A) | 100K | $0 |
| Sep 9, 2025 | Cohen Jacob D. | Chief Executive Officer, Director, 10% Owner | Grant (A) | 500K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| SS SPDR S&P 500 ETF TRUST-USSPY | 3 funds | $132.8M |
| INVESCO QQQ TRUST SERIES 1QQQ | 3 funds | $110.2M |
| NVIDIA CORPNVDA | 3 funds | $84.6M |
| APPLE INCAAPL | 3 funds | $77.3M |
| AMAZON.COM INCAMZN | 3 funds | $74.8M |
| MICROSOFT CORPMSFT | 3 funds | $45.9M |
| SEAGATE TECHNOLOGY HOLDINGSSTX | 3 funds | $37.5M |
| GENERAL ELECTRICGE | 3 funds | $36.0M |
| ALPHABET INC-CL AGOOGL | 3 funds | $35.9M |
| AT&T INCT | 3 funds | $32.1M |
| INVESCO NASDAQ 100 ETFQQQM | 3 funds | $28.1M |
| JPMORGAN CHASE & COJPM | 3 funds | $23.4M |
Ranked by how many of MGRX'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 MGRX. 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.