How much did PRTA move each index today?
XBI: PRTA moved +2.67% and contributed +0.00 points of the index's +4.46-point move (0% of it), ranking #100 of 154 members by contribution to the move.
PRTA closed the 2026-10-09 session at 8.84; that day's move sits in the 83th percentile of its own past year. The stock is 23.2% below its 52-week closing high and −7.4% for the year so far.
PRTA in the XBI beyond today
| window | PRTA return | points contributed | index move | rank |
|---|---|---|---|---|
| 1 week | +5.74% | +0.01 pts | −0.68 pts | #106 of 157 |
| 1 month | −2.00% | −0.01 pts | −3.07 pts | #105 of 157 |
| quarter to date | +5.49% | +0.01 pts | −3.93 pts | #120 of 157 |
| year to date | −7.43% | −0.03 pts | +31.82 pts | #91 of 157 |
Who moved with and against PRTA today?
On PRTA'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/PRTA, free to cite with attribution.