How much did IONS move each index today?
XBI: IONS moved +4.57% and contributed +0.08 points of the index's +4.46-point move (2% of it), ranking #17 of 154 members by contribution to the move.
IONS closed the 2026-10-09 session at 45.28; that day's move sits in the 99th percentile of its own past year. The stock is 47.7% below its 52-week closing high and −42.8% for the year so far.
IONS in the XBI beyond today
| window | IONS return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | +4.00% | +0.07 pts | −0.68 pts | #147 of 157 |
| 1 month | −18.63% | −0.40 pts | −3.07 pts | #11 of 157 |
| quarter to date | +1.41% | +0.04 pts | −3.93 pts | #140 of 157 |
| year to date | −42.76% | −1.40 pts | +31.82 pts | #154 of 157 |
Who moved with and against IONS today?
On IONS's side of the XBI tape: MRNA (+0.45 pts), IOVA (+0.23 pts), PCVX (+0.19 pts). Pulling the other way: PRAX (−0.03 pts), MDGL (−0.02 pts), PURR (−0.02 pts).
Every member's contribution, top to bottom, is on the index dashboards; the day's story is in the market-close note. Machine-readable figures for this stock: /api/stock/IONS, free to cite with attribution.