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
16%
Compressed — premium buying regime
30-Day Avg
24%
60-Day Avg
29%
90-Day Avg
36%
90-Day Low
0%
90-Day High
100%
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 |
|---|---|---|
| 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% |
| 20260518 | 65% | 2.8% |
| 20260515 | 66% | 2.8% |
| 20260514 | 59% | 2.6% |
| 20260513 | 76% | 3.2% |
| 20260512 | 4% | 0.8% |
| 20260511 | 72% | 3.1% |
| 20260510 | 39% | 2.0% |
| 20260508 | 46% | 2.2% |
| 20260507 | 47% | 2.2% |
| 20260506 | 30% | 1.7% |
| 20260505 | 36% | 1.9% |
| 20260504 | 44% | 2.1% |
| 20260502 | 49% | 2.3% |
| 20260501 | 43% | 2.1% |
| 20260430 | 15% | 1.2% |
| 20260429 | 45% | 2.2% |
| 20260428 | 14% | 1.2% |
| 20260427 | 79% | 3.3% |
| 20260424 | 75% | 3.2% |
| 20260423 | 73% | 3.1% |
| 20260422 | 81% | 3.4% |
| 20260421 | 71% | 3.0% |
| 20260420 | 68% | 2.9% |
| 20260417 | 79% | 3.3% |
| 20260416 | 100% | 4.0% |
| 20260415 | 78% | 3.2% |
| 20260414 | 77% | 3.1% |
| 20260413 | 100% | 3.8% |
| 20260410 | 0% | 0.7% |
| 20260409 | 37% | 1.4% |
| 20260408 | 13% | 1.0% |
| 20260407 | 7% | 0.9% |
| 20260406 | 4% | 0.8% |