Xilio Development Inc
Ownership
Ownership Structure
Who owns Xilio Development Inc (XLO)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 51.7% of the shares are freely tradable; institutional investors hold 51.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 10.09 | 664,021 | -91.0 | 03/31/2026 |
| Frazier Life Sciences Management, L.P. | 6.42 | 422,505 | -92.9 | 03/31/2026 |
| Sio Capital Management, LLC | 2.32 | 152,464 | +0.0 | 06/30/2026 |
| Vanguard Capital Management, LLC | 1.88 | 123,660 | +0.0 | 03/31/2026 |
| Adage Capital Partners Gp LLC | 1.70 | 111,541 | +0.0 | 06/30/2026 |
| Merck & Co Inc | 1.61 | 105,982 | +0.0 | 06/30/2026 |
| Stonepine Capital Management Llc | 0.98 | 64,162 | -49.2 | 03/31/2026 |
| Morgan Stanley - Brokerage Accounts | 0.87 | 57,493 | -93.2 | 03/31/2026 |
| Renaissance Technologies Corp | 0.75 | 49,566 | -85.6 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.16 | 142,440 | +0.0 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 25, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.