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 MGYR 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/MGYR"
Use Arkolith to show who owns MGYR, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $1.7M | 96K | ▼−4.4% Reduced · −4K sh | Q4 2025 | |
| 2 | GEODE CAPITAL MANAGEMENT, LLC | $934K | 54K | ▼−13% Reduced · −8K sh | Q1 2026 | |
| 3 | VANGUARD FIDUCIARY TRUST CO | $531K | 31K | ▲New +31K sh | Q1 2026 | |
| 4 | FIRST MANHATTAN CO. LLC. | $485K | 28K | —Held | Q1 2026 | |
| 5 | BlackRock, Inc. | $262K | 15K | ▲+3.8% Added · +548 sh | Q1 2026 | |
| 6 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $200K | 12K | —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 12, 2026 | Yelencsics Joseph A | Director | Grant (A) | 200 | $4K |
| Feb 25, 2026 | Fitzgerald John S | President and CEO, Director | Grant (A) | 739 | $13K |
| Feb 25, 2026 | Ansari Jon | EVP and CFO, Director | Grant (A) | 500 | $9K |
| Feb 19, 2026 | Fitzgerald John S | President and CEO, Director | Grant (A) | 44 | $792 |
| Feb 17, 2026 | Fitzgerald John S | President and CEO, Director | Grant (A) | 100 | $2K |
| Feb 12, 2026 | Fitzgerald John S | President and CEO, Director | Grant (A) | 5 | $90 |
| Feb 11, 2026 | Fitzgerald John S | President and CEO, Director | Grant (A) | 100 | $2K |
| Dec 12, 2025 | Lombardi Michael R | Director | Buy (P) | 261 | $4K |
| Dec 11, 2025 | Lombardi Michael R | Director | Buy (P) | 1 | $17 |
| Dec 11, 2025 | Lombardi Michael R | Director | Buy (P) | 288 | $5K |
| Nov 6, 2025 | Fitzgerald John S | President and CEO, Director | Grant (A) | 200 | $3K |
| Nov 6, 2025 | Ruane Maureen | Director | Grant (A) | 1K | $25K |
| Company | Co-held by | Combined value |
|---|---|---|
| NVIDIA CORPNVDA | 3 funds | $2.2B |
| MICROSOFT CORPMSFT | 3 funds | $1.8B |
| ALPHABET INC-CL AGOOGL | 3 funds | $1.5B |
| ALPHABET INC-CL CGOOG | 3 funds | $1.4B |
| APPLE INCAAPL | 3 funds | $1.3B |
| BROADCOM INCAVGO | 3 funds | $1.2B |
| AMAZON.COM INCAMZN | 3 funds | $1.1B |
| BERKSHIRE HATHAWAY INC-CL BBRK/B | 3 funds | $893.9M |
| ORACLE CORPORCL | 3 funds | $610.8M |
| APPLIED MATERIALS INCAMAT | 3 funds | $517.4M |
| VISA INC-CLASS A SHARESV | 3 funds | $496.7M |
| SALESFORCE INCCRM | 3 funds | $496.2M |
Ranked by how many of MGYR'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 MGYR. 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.