Energy Recovery (ERII) Options Chain
NASDAQ: ERIITechnologyIndustrial Machinery/ComponentsUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Expiration date
- Expiration
- Nov 20, 2026
- Days to expiration
- 40
- Share price
- $6.84
- Put/call ratio (OI)
- 5.48
- Put/call ratio (volume)
- 0.58
- Expected move
- ±$1.57
- Open interest (C / P)
- 4.15K / 22.71K
ERII options summary
The ERII options chain for the November 20, 2026 expiration lists 8 call and 5 put contracts, with 40 days until expiration. Open interest stands at 4,147 calls and 22,707 puts, a put/call ratio of 5.48, which is more bearish, with puts outnumbering calls. At-the-money implied volatility near the $7.50 strike is 69.1%, which implies the market expects a move of about ±$1.57 (22.9%) in Energy Recovery stock by expiration.
The most open interest sits at the $20.00 call (1.58K contracts) and the $7.50 put (22.63K contracts).
Summary generated from market data by MetaCap's automated system. Methodology
ERII options chain · November 20, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 6.24 | 0.00 | 0.00 | 2.50 | — | — | — | |||||
| 2.15 | 1.65 | 2.35 | 5.00 | 0.00 | 0.75 | 0.05 | |||||
| 0.35 | 0.35 | 0.45 | 7.50 | 0.85 | 1.20 | 1.00 | |||||
| 0.05 | 0.05 | 0.10 | 10.00 | 2.60 | 3.80 | 3.25 | |||||
| 0.05 | 0.00 | 0.15 | 12.50 | — | — | — | |||||
| 0.01 | 0.00 | 0.00 | 15.00 | — | — | — | |||||
| 0.07 | 0.00 | 0.75 | 17.50 | 8.30 | 9.80 | 8.99 | |||||
| 0.05 | 0.00 | 0.20 | 20.00 | 10.30 | 12.70 | 11.49 | |||||
In-the-money callsIn-the-money puts. IV = implied volatility, OI = open interest (contracts). Each contract covers 100 shares. Quotes delayed at least 15 minutes.
Frequently asked questions
What is the ERII put/call ratio?
For the November 20, 2026 expiration, the ERII put/call ratio based on open interest is 5.48 (22,707 puts vs 4,147 calls), and 0.58 based on today's volume. A ratio above 1 means more puts than calls.
What is ERII's implied volatility?
At-the-money implied volatility for ERII options expiring November 20, 2026 is about 69.1%, an annualized estimate of how much the market expects Energy Recovery stock to move.
How many ERII option expiration dates are there?
ERII has 5 listed expiration dates, from Oct 16, 2026 to Jan 19, 2029.
What does "in the money" mean?
A call is in the money when the strike price is below the current share price; a put is in the money when the strike is above it. In-the-money contracts have intrinsic value and are shaded in the table.