Among active 13F managers last quarter, none opened or added and 1 reduced; the largest holder to move was XTX Topco Ltd (−14%). No open-market insider trades in the last 180 days.
Funds lean out and no leg opposes.
3 tracked 13F filers disclose a position in MB as of the latest SEC 13F filings, a combined $318K 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 | XTX Topco Ltd | 39K | $229K | ▼−14% Reduced · −6K sh | Q1 2026 | |
| 2 | Geode Capital Management, LLC | 11K | $53K | —Held | Q2 2026 | |
| 3 | UBS Group AG | 6K | $36K | ▲+3.0% Added · +181 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.
Last quarter, no active manager opened or added to a position in MB, while 1 reduced. 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 |
|---|---|---|
| Ishares Msci South Korea ETFEWY | 1 funds | $35.4M |
| SS SPDR S&P 500 ETF Trust-USSPY | 1 funds | $28.3M |
| SS SPDR Dow Jones Indus AvgDIA | 1 funds | $24.6M |
| Cme Group IncCME | 1 funds | $23.0M |
| Nvidia CorpNVDA | 1 funds | $22.1M |
| Citigroup IncC | 1 funds | $19.8M |
| Duke Energy CorpDUK | 1 funds | $19.7M |
| Goldman Sachs Group IncGS | 1 funds | $18.9M |
| General ElectricGE | 1 funds | $18.9M |
| Boston Scientific CorpBSX | 1 funds | $18.2M |
| Parker Hannifin CorpPH | 1 funds | $18.1M |
| Amazon.com IncAMZN | 1 funds | $17.1M |
Ranked by how many of MB's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in MB.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Feb 8, 2019 | Lugard Road Capital GP, LLC | 10% Owner | Buy (P) 12 lots, same day | 802K | $29.2M |
| Feb 7, 2019 | Luxor Wavefront, LP | 10% Owner | Buy (P) 4 lots, same day | 1.1M | $40.4M |
| Feb 6, 2019 | Luxor Wavefront, LP | 10% Owner | Buy (P) 2 lots, same day | 217K | $7.9M |
| Feb 5, 2019 | Luxor Wavefront, LP | 10% Owner | Buy (P) 9 lots, same day | 653K | $23.8M |
| Feb 1, 2019 | White Brett T | CFO & COO | Sell (S) | 10K | $364K |
| Jan 2, 2019 | White Brett T | CFO & COO | Sell (S) | 10K | $364K |
| Dec 24, 2018 | White Brett T | CFO & COO | Sell (S) | 10K | $363K |
| Dec 24, 2018 | Lytikainen Kimberly Gail | Chief Legal Officer &Secretary | Sell (S) | 10K | $352K |
| Dec 3, 2018 | Stollmeyer Richard Lee | CEO, Director | Sell (S) | 18K | $494K |
| Nov 6, 2018 | Lugard Road Capital, LP | 10% Owner | Sell (S) 6 lots, same day | 40K | $1.3M |
| Nov 5, 2018 | Luxor Capital Partners Offshore Ltd | 10% Owner | Sell (S) 12 lots, same day | 58K | $1.9M |
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 | 1 | 1 | – |
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 MB
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/MB/capital-change-brief"
Use Arkolith's capital_change_brief for MB. 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 MB. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.