XLO Institutional Ownership
Who owns Xilio Therapeutics, Inc. and what the big funds did with it last quarter, from every SEC 13F filing. 26 funds reported holding XLO at Jun 30, 2026, together owning 58.9% of the company.
- ▲14 buying vs 11 selling
- ▲Held by funds +13.6 pts
- ▲Funds holding +2
- ▲Superinvestors: 2 added, 0 cut
- ●Put/call not meaningful
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 26 | 24 | +8.3% |
| In funds' top 10 | 1 | 2 | −50.0% |
| 13F shares | 3.4M | 2.6M | +30.1% |
| Held by funds | 58.9% | 45.3% | +13.6 pts |
| New positions | 10 | 20 | −50.0% |
| Increased | 4 | 0 | – |
| Reduced | 4 | 1 | +300.0% |
| Sold out | 7 | 35 | −80.0% |
| Calls (shares) | 0 | 0 | – |
| Puts (shares) | 0 | 0 | – |
| Put/call ratio | – | – | – |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in XLO
All superinvestors →
Who owns XLO
share of fund held shares- Index and passive funds7.7%
- Active managers and hedge funds90.6%
- Banks and brokers1.7%
- Pensions, insurers and other0.0%
The top 10 holders own 93.0% of all XLO shares that funds reported. Groups are our own grouping of filers by name.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | Bain Capital Life Sciences Investors, LLC | 11.48% | 664K | $6.4M | 0 |
| 2 | Gilead Sciences, Inc. | 11.25% | 650K | $6.2M | 0 |
| 3 | Orbimed Advisors LLC | 10.24% | 592K | $5.7M | +592K |
| 4 | Frazier Life Sciences Management, L.P. | 7.31% | 423K | $4M | 0 |
| 5 | Stonepine Capital Management, LLC | 3.91% | 226K | $2.2M | +162K |
| 6 | Vanguard Capital Management LLC | 3.09% | 179K | $1.7M | +55K |
| 7 | Sio Capital Management, LLC | 2.64% | 152K | $1.5M | 0 |
| 8 | Adage Capital Partners Gp, L.l.c. | 1.93% | 112K | $1.1M | +112K |
| 9 | Merck & Co., Inc. | 1.83% | 106K | $1M | 0 |
| 10 | Renaissance Technologies LLC | 1.11% | 64K | $615K | +15K |
- Orbimed Advisors LLC+592K sh+$5.7M
- Stonepine Capital Management, LLC+162K sh+$1.6M
- Adage Capital Partners Gp, L.l.c.+112K sh+$1.1M
- Vanguard Capital Management LLC+55K sh+$526K
- Citadel Advisors LLC+26K sh+$249K
- Bridgeway Capital Management, LLC+18K sh+$168K
- Renaissance Technologies LLC+15K sh+$140K
- Two Sigma Investments, LP+15K sh+$139K
- Caligan Partners LP−112K sh−$943K
- AJU IB Investment Co., Ltd.−48K sh−$401K
- Fmr LLC−37K sh−$307K
- Ghisallo Capital Management LLC−14K sh−$116K
- Vanguard Fiduciary Trust Co−5,881 sh−$56K
- UBS Group AG−4,024 sh−$39K
- Gsa Capital Partners LLP−3,356 sh−$32K
- Morgan Stanley−539 sh−$5K
XLO institutional ownership FAQ
Who owns the most XLO stock?
In Q2 2026 13F filings the largest holder of XLO was Bain Capital Life Sciences Investors, LLC, followed by Gilead Sciences, Inc. and Orbimed Advisors LLC. Index fund managers are usually the biggest holders of large companies.
What percentage of XLO is owned by institutions?
Funds that file 13F reports held 58.9% of XLO's shares at Jun 30, 2026, compared with 45.3% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying XLO?
In Q2 2026, 14 funds bought XLO (10 of them new positions) and 11 sold (7 sold out completely). Among well known investors, 2 added and 0 cut. Our fund sentiment for XLO is strongly bullish.
What is XLO's institutional put/call ratio?
Too few option positions were reported for a meaningful ratio.
How current is this XLO ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.