How much did PTCT move each index today?
XBI: PTCT moved −1.58% and contributed −0.02 points of the index's −2.28-point move (1% of it), ranking #32 of 147 members by contribution to the move.
PTCT closed the 2026-08-25 session at 73.47; that day's move sits in the 89th percentile of its own past year. The stock is 18.0% below its 52-week closing high and −3.3% for the year so far.
PTCT in the XBI beyond today
| window | PTCT return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | +1.16% | +0.02 pts | +9.00 pts | #76 of 147 |
| 1 month | −3.07% | −0.05 pts | +18.53 pts | #125 of 147 |
| quarter to date | −9.93% | −0.10 pts | +10.87 pts | #123 of 147 |
| year to date | −3.28% | +0.10 pts | +47.19 pts | #94 of 147 |
Who moved with and against PTCT today?
On PTCT'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/PTCT, free to cite with attribution.