Energy Recovery (ERII) Options Chain
NASDAQ: ERIITechnologyIndustrial Machinery/ComponentsUSD
Market open · Delayed 15 min · as of Oct 9, 10:12 AM ET
Expiration date
- Expiration
- Oct 16, 2026
- Days to expiration
- 7
- Share price
- $6.82
- Put/call ratio (OI)
- 0.09
- Put/call ratio (volume)
- 0.07
- Expected move
- ±$0.7926
- Open interest (C / P)
- 92 / 8
ERII options summary
The ERII options chain for the October 16, 2026 expiration lists 3 call and 1 put contracts, with 7 days until expiration. Open interest stands at 92 calls and 8 puts, a put/call ratio of 0.09, which is tilted bullish, with calls outnumbering puts. At-the-money implied volatility near the $7.50 strike is 84.0%, which implies the market expects a move of about ±$0.7926 (11.6%) in Energy Recovery stock by expiration.
The most open interest sits at the $7.50 call (81 contracts) and the $7.50 put (8 contracts).
Summary generated from market data by MetaCap's automated system. Methodology
ERII options chain · October 16, 2026
| Calls | Puts | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Last | Bid | Ask | Strike | Bid | Ask | Last | |||||
| 2.11 | 1.60 | 2.25 | 5.00 | — | — | — | |||||
| 0.05 | 0.00 | 0.40 | 7.50 | 0.45 | 1.00 | 0.70 | |||||
| 0.15 | 0.00 | 0.00 | 10.00 | — | — | — | |||||
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 October 16, 2026 expiration, the ERII put/call ratio based on open interest is 0.09 (8 puts vs 92 calls), and 0.07 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 October 16, 2026 is about 84.0%, 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.