How much did TWST move each index today?
XBI: TWST moved +5.08% and contributed +0.15 points of the index's +4.46-point move (3% of it), ranking #5 of 154 members by contribution to the move.
ARKK: TWST moved +5.08% and contributed +0.14 points of the index's +2.02-point move (7% of it), ranking #5 of 39 members by contribution to the move.
TWST closed the 2026-10-09 session at 159.78; that day's move sits in the 83th percentile of its own past year. The stock is 22.1% below its 52-week closing high and +403.7% for the year so far.
TWST in the XBI beyond today
| window | TWST return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | −15.31% | −0.50 pts | −0.68 pts | #1 of 157 |
| 1 month | +25.96% | +1.30 pts | −3.07 pts | #154 of 157 |
| quarter to date | −17.32% | −0.58 pts | −3.93 pts | #1 of 157 |
| year to date | +403.72% | +3.33 pts | +31.82 pts | #2 of 157 |
Who moved with and against TWST today?
On TWST'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/TWST, free to cite with attribution.