How much did PRTA move each index today?
XBI: PRTA moved −2.23% and contributed −0.00 points of the index's −1.61-point move (0% of it), ranking #84 of 147 members by contribution to the move.
PRTA closed the 2026-08-25 session at 9.42; that day's move sits in the 57th percentile of its own past year. The stock is 18.2% below its 52-week closing high and −1.4% for the year so far.
PRTA in the XBI beyond today
| window | PRTA return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | +8.15% | +0.02 pts | +9.00 pts | #80 of 147 |
| 1 month | +8.28% | +0.02 pts | +18.53 pts | #102 of 147 |
| quarter to date | −3.78% | −0.01 pts | +10.87 pts | #94 of 147 |
| year to date | −1.36% | −0.01 pts | +47.19 pts | #117 of 147 |
Who moved with and against PRTA today?
On PRTA's side of the XBI tape: MRNA (−0.32 pts), SYRE (−0.28 pts), RLAY (−0.10 pts). Pulling the other way: ERAS (+0.11 pts), SMMT (+0.09 pts), SRRK (+0.08 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/PRTA, free to cite with attribution.