PRTA (Prothena Corporation plc Ordinary Shares)
Historical IV Rank & Volatility Regime
IV Rank measures where PRTA's current 30-day implied volatility sits in its trailing 90-day distribution (0% = lowest in 90 days, 100% = highest). It's the most reliable signal for whether options on PRTA are priced rich or cheap relative to its own recent regime.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
PRTA IV Rank Summary
Current
73%
Moderate — neutral regime
30-Day Avg
32%
60-Day Avg
28%
90-Day Avg
28%
90-Day Low
0%
90-Day High
73%
IV Rank is bounded 0%–100% by construction. Sustained levels above 75% historically
precede mean reversion in PRTA's implied vol; sustained sub-25% readings
often coincide with low-realized regimes ahead of catalyst events. See the
Vol Arb Screener for symbols where current IV
rank diverges most from realized volatility.
PRTA IV Rank — Last 90 Trading Days
| Date | IV Rank | Avg IV |
|---|---|---|
| 20260925 | 73% | 2.4% |
| 20260924 | 53% | 1.9% |
| 20260923 | 28% | 1.3% |
| 20260922 | 19% | 1.1% |
| 20260921 | 50% | 1.9% |
| 20260918 | 34% | 1.4% |
| 20260917 | 30% | 1.3% |
| 20260916 | 41% | 1.6% |
| 20260915 | 66% | 2.3% |
| 20260914 | 22% | 1.1% |
| 20260911 | 23% | 1.2% |
| 20260910 | 23% | 1.1% |
| 20260909 | 27% | 1.3% |
| 20260908 | 26% | 1.2% |
| 20260904 | 13% | 0.9% |
| 20260903 | 0% | 0.6% |
| 20260902 | 51% | 2.0% |
| 20260901 | 38% | 1.6% |
| 20260831 | 28% | 1.4% |
| 20260828 | 27% | 1.4% |
| 20260827 | 36% | 1.6% |
| 20260826 | 14% | 1.0% |
| 20260825 | 39% | 1.7% |
| 20260824 | 33% | 1.8% |
| 20260821 | 24% | 1.4% |
| 20260820 | 23% | 1.4% |
| 20260819 | 16% | 1.2% |
| 20260818 | 26% | 1.5% |
| 20260817 | 22% | 1.4% |
| 20260814 | 38% | 1.9% |
| 20260813 | 31% | 1.7% |
| 20260812 | 13% | 1.1% |
| 20260811 | 16% | 1.2% |
| 20260810 | 13% | 1.1% |
| 20260806 | 18% | 1.2% |
| 20260805 | 38% | 1.9% |
| 20260804 | 31% | 1.7% |
| 20260803 | 25% | 1.5% |
| 20260731 | 54% | 2.4% |
| 20260730 | 36% | 1.8% |
| 20260729 | 29% | 1.6% |
| 20260728 | 38% | 1.9% |
| 20260727 | 26% | 1.5% |
| 20260724 | 1% | 0.7% |
| 20260723 | 25% | 1.5% |
| 20260722 | 37% | 1.9% |
| 20260721 | 0% | 0.7% |
| 20260720 | 20% | 1.3% |
| 20260716 | 23% | 1.4% |
| 20260715 | 23% | 1.4% |
| 20260714 | 21% | 1.3% |
| 20260713 | 33% | 1.7% |
| 20260710 | 26% | 1.5% |
| 20260709 | 15% | 1.1% |
| 20260708 | 7% | 0.9% |
| 20260707 | 4% | 0.8% |
| 20260706 | 18% | 1.3% |
| 20260702 | 25% | 1.5% |
| 20260701 | 28% | 1.6% |
| 20260630 | 44% | 2.1% |
| 20260629 | 33% | 1.7% |
| 20260626 | 20% | 1.3% |
| 20260625 | 14% | 1.1% |
| 20260624 | 38% | 1.9% |
| 20260623 | 15% | 1.2% |
| 20260622 | 23% | 1.4% |
| 20260618 | 16% | 1.2% |
| 20260617 | 24% | 1.5% |
| 20260616 | 27% | 1.5% |
| 20260615 | 29% | 1.6% |
| 20260613 | 30% | 1.6% |
| 20260612 | 40% | 2.0% |
| 20260611 | 19% | 1.3% |
| 20260610 | 39% | 2.0% |
| 20260609 | 28% | 1.6% |
| 20260608 | 25% | 1.5% |
| 20260605 | 21% | 1.3% |
| 20260604 | 0% | 0.7% |
| 20260603 | 20% | 1.3% |
| 20260602 | 22% | 1.4% |
| 20260601 | 13% | 1.1% |
| 20260529 | 73% | 3.1% |
| 20260528 | 66% | 2.9% |
| 20260527 | 73% | 3.1% |
| 20260526 | 72% | 3.0% |
| 20260522 | 67% | 2.9% |
| 20260521 | 2% | 0.8% |
| 20260520 | 10% | 1.0% |
| 20260519 | 10% | 1.0% |