How much did STOK move each index today?
XBI: STOK moved −1.57% and contributed −0.01 points of the index's −2.29-point move (1% of it), ranking #66 of 147 members by contribution to the move.
STOK closed the 2026-08-25 session at 33.46; that day's move sits in the 86th percentile of its own past year. The stock is 12.8% below its 52-week closing high and +5.4% for the year so far.
STOK in the XBI beyond today
| window | STOK return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | +4.11% | +0.03 pts | +9.00 pts | #61 of 147 |
| 1 month | +14.16% | +0.11 pts | +18.53 pts | #63 of 147 |
| quarter to date | +2.26% | +0.01 pts | +10.87 pts | #84 of 147 |
| year to date | +5.42% | +0.01 pts | +47.19 pts | #112 of 147 |
Who moved with and against STOK today?
On STOK's side of the XBI tape: SYRE (−0.27 pts), MRNA (−0.22 pts), RLAY (−0.10 pts). Pulling the other way: SMMT (+0.16 pts), PGEN (+0.03 pts), PRAX (+0.03 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/STOK, free to cite with attribution.