Among active 13F managers last quarter, 2 opened and 1 added, while none reduced or exited; the largest holder to move was XTX Topco Ltd (+89%). No open-market insider trades in the last 180 days.
Funds lean in and no leg opposes.
7 tracked 13F filers disclose a position in MGN as of the latest SEC 13F filings, a combined $103K in reported value. 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.
| # | Fund | Shares | Position value | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Jane Street Group, LLC | 470K | $82K | ▲New +470K sh | Q1 2026 | |
| 2 | UBS Group AG | 63K | $11K | ▲33× Added · +61K sh | Q1 2026 | |
| 3 | XTX Topco Ltd | 27K | $5K | ▲+89% Added · +13K sh | Q1 2026 | |
| 4 | Oasis Management Co Ltd. | 17K | $3K | —Held | Q2 2026 | |
| 5 | StoneX Group Inc. | 13K | $2K | ▲New +13K sh | Q2 2026 | |
| 6 | Torno Capital, LLC | 500 | $76 | ▲New +500 sh | Q2 2026 | |
| 7 | Caitong International Asset Management Co., Ltd | 1 | $0 | —Held | Q2 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.
Last quarter, 2 funds opened a new position in MGN and 1 added to an existing one, while none reduced or exited. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Their position there |
|---|---|---|
| Nvidia CorpNVDA | 4 funds | $551.2M |
| Alphabet Inc-CL CGOOG | 4 funds | $310.5M |
| Amazon.com IncAMZN | 4 funds | $278.8M |
| Apple IncAAPL | 4 funds | $99.8M |
| Microsoft CorpMSFT | 3 funds | $351.1M |
| Taiwan Semiconductor-SP ADRTSM | 3 funds | $60.7M |
| Advanced Micro DevicesAMD | 3 funds | $57.0M |
| Corning IncGLW | 3 funds | $45.1M |
| Intel CorpINTC | 3 funds | $38.1M |
| ASML Holding NV-NY Reg SHSASML | 3 funds | $32.8M |
| Alphabet Inc-CL AGOOGL | 3 funds | $30.5M |
| KT Corp-SP ADRKT | 3 funds | $27.5M |
Ranked by how many of MGN's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in MGN.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Apr 16, 2015 | Dobbs Glenn | CEO, Director | Buy (P) | 5K | $2K |
| Apr 14, 2015 | Dobbs Glenn | CEO, Director | Buy (P) | 6K | $3K |
| Apr 7, 2015 | Dobbs Glenn | CEO, Director | Buy (P) | 43K | $22K |
| Apr 6, 2015 | Dobbs Glenn | CEO, Director | Buy (P) | 170 | $80 |
| Apr 2, 2015 | Dobbs Glenn | CEO, Director | Buy (P) | 7K | $3K |
| Mar 31, 2015 | Dobbs Glenn | CEO, Director | Buy (P) | 50K | $23K |
| Nov 20, 2013 | Dobbs Glenn | CEO, Director | Buy (P) | 20K | $10K |
| Nov 13, 2013 | Dobbs Glenn | CEO, Director | Buy (P) | 23K | $12K |
| Jul 1, 2013 | Dobbs Glenn | CEO, Director | Buy (P) 2 lots, same day | 16K | $9K |
| Feb 21, 2013 | Dobbs Glenn | Director | Buy (P) | 39K | $40K |
| Dec 28, 2012 | Dobbs Glenn | President and CEO, Director | Buy (P) | 50K | $52K |
| Sep 6, 2012 | Dobbs Glenn | President and CEO, Director | Buy (P) | 10K | $15K |
One row per insider, day and transaction code; shares and value are summed across the lots. Every lot is on the full insider page and in the filing.
Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.
Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive
| Source | Buying | Selling | Net |
|---|---|---|---|
13F funds Top 100 holders by value, passive included; the hero counts active managers only | 2 | 0 | – |
Insiders Form 4 open-market | 0 | 0 | $0 |
US House STOCK Act trades | 0 | 0 | $0 |
Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.
Connected entities for MGN
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/MGN/capital-change-brief"
Use Arkolith's capital_change_brief for MGN. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for MGN. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.