ERII (Energy Recovery, Inc.)
Historical IV Rank & Volatility Regime
IV Rank measures where ERII'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 ERII 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.
ERII IV Rank Summary
Current
10%
Compressed — premium buying regime
30-Day Avg
38%
60-Day Avg
31%
90-Day Avg
39%
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 ERII'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.
ERII IV Rank — Last 90 Trading Days
| Date | IV Rank | Avg IV |
|---|---|---|
| 20260806 | 10% | 1.0% |
| 20260805 | 65% | 1.8% |
| 20260804 | 60% | 1.7% |
| 20260803 | 69% | 1.9% |
| 20260731 | 47% | 1.5% |
| 20260730 | 61% | 1.8% |
| 20260729 | 48% | 1.6% |
| 20260728 | 47% | 1.5% |
| 20260727 | 45% | 1.5% |
| 20260724 | 43% | 1.5% |
| 20260723 | 34% | 1.3% |
| 20260722 | 23% | 1.2% |
| 20260721 | 35% | 1.4% |
| 20260720 | 30% | 1.3% |
| 20260716 | 37% | 1.4% |
| 20260715 | 28% | 1.3% |
| 20260714 | 20% | 1.1% |
| 20260713 | 25% | 1.2% |
| 20260710 | 20% | 1.1% |
| 20260709 | 28% | 1.3% |
| 20260708 | 34% | 1.3% |
| 20260707 | 34% | 1.3% |
| 20260706 | 31% | 1.3% |
| 20260702 | 47% | 1.5% |
| 20260701 | 32% | 1.3% |
| 20260630 | 27% | 1.2% |
| 20260629 | 42% | 1.5% |
| 20260626 | 25% | 1.2% |
| 20260625 | 44% | 1.5% |
| 20260624 | 37% | 1.4% |
| 20260623 | 23% | 1.2% |
| 20260622 | 35% | 1.4% |
| 20260618 | 24% | 1.2% |
| 20260617 | 32% | 1.3% |
| 20260616 | 25% | 1.2% |
| 20260615 | 31% | 1.3% |
| 20260613 | 11% | 1.0% |
| 20260612 | 10% | 1.0% |
| 20260611 | 0% | 0.8% |
| 20260610 | 19% | 1.2% |
| 20260609 | 10% | 1.0% |
| 20260608 | 4% | 0.9% |
| 20260605 | 7% | 1.0% |
| 20260604 | 0% | 0.9% |
| 20260603 | 12% | 1.1% |
| 20260602 | 61% | 1.8% |
| 20260601 | 62% | 1.8% |
| 20260529 | 69% | 1.9% |
| 20260528 | 22% | 1.2% |
| 20260527 | 42% | 1.5% |
| 20260526 | 45% | 1.5% |
| 20260522 | 24% | 1.2% |
| 20260521 | 19% | 1.2% |
| 20260520 | 18% | 1.2% |
| 20260519 | 57% | 1.7% |
| 20260518 | 26% | 1.3% |
| 20260515 | 13% | 1.1% |
| 20260514 | 17% | 1.1% |
| 20260513 | 21% | 1.2% |
| 20260512 | 5% | 1.0% |
| 20260511 | 38% | 1.5% |
| 20260510 | 27% | 1.3% |
| 20260508 | 25% | 1.3% |
| 20260507 | 44% | 1.5% |
| 20260506 | 11% | 1.0% |
| 20260505 | 15% | 1.1% |
| 20260504 | 3% | 0.9% |
| 20260502 | 71% | 1.9% |
| 20260501 | 85% | 2.1% |
| 20260430 | 75% | 2.0% |
| 20260429 | 100% | 2.4% |
| 20260428 | 70% | 1.8% |
| 20260427 | 98% | 2.1% |
| 20260424 | 73% | 1.8% |
| 20260423 | 63% | 1.7% |
| 20260422 | 72% | 1.8% |
| 20260421 | 93% | 2.1% |
| 20260420 | 63% | 1.7% |
| 20260417 | 72% | 1.8% |
| 20260416 | 63% | 1.7% |
| 20260415 | 54% | 1.6% |
| 20260414 | 57% | 1.6% |
| 20260413 | 45% | 1.4% |
| 20260410 | 42% | 1.4% |
| 20260409 | 50% | 1.5% |
| 20260408 | 33% | 1.3% |
| 20260407 | 43% | 1.4% |
| 20260406 | 47% | 1.5% |
| 20260402 | 39% | 1.4% |
| 20260401 | 75% | 1.8% |