Among active 13F managers last quarter, 1 opened and 1 reduced; the largest holder to move was GAMMA Investing LLC (−64%). No open-market insider trades in the last 180 days.
No leg leans either way.
4 tracked 13F filers disclose a position in XTLB as of the latest SEC 13F filings, a combined $18K 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 | Rhumbline Advisers | 6K | $14K | ▼−80% Reduced · −24K sh | Q1 2026 | |
| 2 | GAMMA Investing LLC | 1K | $3K | ▼−64% Reduced · −2K sh | Q2 2026 | |
| 3 | Tower Research Capital LLC (TRC) | 244 | $588 | ▲New +244 sh | Q1 2026 | |
| 4 | Morgan Stanley | 10 | $24 | ▼−99% Reduced · −2K 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, 1 fund opened a new position in XTLB, 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 |
|---|---|---|
| Apple IncAAPL | 2 funds | $232.9M |
| Nvidia CorpNVDA | 2 funds | $202.2M |
| Microsoft CorpMSFT | 2 funds | $167.9M |
| Invesco QQQ Trust Series 1QQQ | 2 funds | $143.5M |
| Micron Technology IncMU | 2 funds | $129.9M |
| Broadcom IncAVGO | 2 funds | $112.4M |
| Alphabet Inc-CL AGOOGL | 2 funds | $110.9M |
| Tesla IncTSLA | 2 funds | $98.9M |
| Amazon.com IncAMZN | 2 funds | $93.7M |
| Alphabet Inc-CL CGOOG | 2 funds | $74.4M |
| JPMorgan Chase & CoJPM | 2 funds | $66.7M |
| Meta Platforms Inc-Class AMETA | 2 funds | $59.7M |
Ranked by how many of XTLB's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in XTLB.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Nov 19, 2008 | Edelman Joseph | 10% Owner | Sell (S) | 9.6M | $1.4M |
| Nov 18, 2008 | Edelman Joseph | 10% Owner | Sell (S) 7 lots, same day | 30.5M | $4.3M |
| Jun 10, 2008 | Cho Michael | 10% Owner | Buy (P) 2 lots, same day | 51K | $165K |
| Jun 9, 2008 | Perceptive Advisors Llc | 10% Owner | Buy (P) 2 lots, same day | 34K | $113K |
| Jun 6, 2008 | Perceptive Advisors Llc | 10% Owner | Buy (P) 2 lots, same day | 100K | $343K |
| Jun 5, 2008 | Perceptive Advisors Llc | 10% Owner | Buy (P) 4 lots, same day | 300K | $967K |
| Jun 4, 2008 | Perceptive Life Sciences Master Fund Ltd | 10% Owner | Buy (P) 2 lots, same day | 25K | $75K |
| Jun 3, 2008 | Perceptive Life Sciences Master Fund Ltd | 10% Owner | Buy (P) 2 lots, same day | 401K | $1.2M |
| May 2, 2008 | Perceptive Advisors Llc | 10% Owner | Buy (P) 2 lots, same day | 50K | $194K |
| May 1, 2008 | Perceptive Advisors Llc | 10% Owner | Buy (P) 2 lots, same day | 105K | $394K |
| Apr 30, 2008 | Perceptive Life Sciences Master Fund Ltd | 10% Owner | Buy (P) 2 lots, same day | 128K | $480K |
| Apr 29, 2008 | Perceptive Life Sciences Master Fund Ltd | 10% Owner | Buy (P) 2 lots, same day | 229K | $812K |
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 | 0 | 3 | – |
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 XTLB
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/XTLB/capital-change-brief"
Use Arkolith's capital_change_brief for XTLB. 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 XTLB. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.