ERII · Energy Recovery, Inc.

Track ERII — free

$8.35 +0.53 (+6.78%) At close · Aug 14

Market Cap

$426.22M

51.04M

Options Chain

Underlying $8.35 · at close Aug 14, 2026 Options Calculator

Positioning

Aug 21, 2026 · 6 days to expiry · 22 contracts · mixed snapshot sessions · Dec 26, 2025–Aug 14, 2026; 6 unknown

Put / call OI

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dated and unknown snapshot sessions

Open interest

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dated and unknown snapshot sessions

Volume

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dated and unknown snapshot sessions

Chain

Click any strike for greeks, breakeven and the calculator

Expiry

Aug 21 6d Sep 18 34d Nov 20 97d Feb 19 188d

Calls						Puts
OI	Vol	IV	Δ	Last	Strike	Last	Δ	IV	Vol	OI
1	2	—	—	$6.00		—	—	—	—	0
Call · $2.5 In the money Snapshot session Jun 12, 2026 Last $6.00 Breakeven $8.50 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this call Put · $2.5 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 0 Model this put
9	1	—	—	$4.44		$0.10	—	—	1	1
Call · $5 In the money Snapshot session Jun 17, 2026 Last $4.44 Breakeven $9.44 Implied vol — Delta — Gamma — Theta — Vega — Open interest 9 Model this call Put · $5 Snapshot session Aug 10, 2026 Last $0.10 Breakeven $4.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 1 Model this put
425	2	—	—	$0.80		$0.10	-0.183	122.8%	2	946
Call · $7.5 In the money Snapshot session Aug 14, 2026 Last $0.80 Breakeven $8.30 Implied vol — Delta — Gamma — Theta — Vega — Open interest 425 Model this call Put · $7.5 Snapshot session Aug 11, 2026 Last $0.10 Breakeven $7.40 Implied vol 122.8% Delta -0.183 ≈18% ITM Gamma 0.194 Theta -0.029 Vega 0.003 Open interest 946 Model this put
Underlying $8.35
1.3k	22	101.7%	0.136	$0.05		$1.50	-0.695	186.4%	4	76
Call · $10 Snapshot session Aug 14, 2026 Last $0.05 Breakeven $10.05 Implied vol 101.7% Delta 0.136 ≈14% ITM Gamma 0.193 Theta -0.02 Vega 0.002 Open interest 1.3k Model this call Put · $10 In the money Snapshot session Aug 3, 2026 Last $1.50 Breakeven $8.50 Implied vol 186.4% Delta -0.695 ≈70% ITM Gamma 0.168 Theta -0.058 Vega 0.004 Open interest 76 Model this put
2.5k	1	205.1%	0.1	$0.05		$3.70	-0.694	384.4%	1	3
Call · $12.5 Snapshot session Aug 10, 2026 Last $0.05 Breakeven $12.55 Implied vol 205.1% Delta 0.1 ≈10% ITM Gamma 0.077 Theta -0.032 Vega 0.002 Open interest 2.5k Model this call Put · $12.5 In the money Snapshot session Aug 5, 2026 Last $3.70 Breakeven $8.80 Implied vol 384.4% Delta -0.694 ≈69% ITM Gamma 0.082 Theta -0.122 Vega 0.003 Open interest 3 Model this put
164	12	309.3%	0.118	$0.05		$5.00	-0.717	478.2%	2	5
Call · $15 Snapshot session Aug 10, 2026 Last $0.05 Breakeven $15.05 Implied vol 309.3% Delta 0.118 ≈12% ITM Gamma 0.057 Theta -0.055 Vega 0.003 Open interest 164 Model this call Put · $15 In the money Snapshot session Mar 12, 2026 Last $5.00 Breakeven $10.00 Implied vol 478.2% Delta -0.717 ≈72% ITM Gamma 0.063 Theta -0.144 Vega 0.004 Open interest 5 Model this put
41	10	339.6%	0.083	$0.05		—	-0.738	546.5%	—	0
Call · $17.5 Snapshot session Aug 7, 2026 Last $0.05 Breakeven $17.55 Implied vol 339.6% Delta 0.083 ≈8% ITM Gamma 0.04 Theta -0.046 Vega 0.002 Open interest 41 Model this call Put · $17.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 546.5% Delta -0.738 ≈74% ITM Gamma 0.053 Theta -0.158 Vega 0.004 Open interest 0 Model this put
134	15	—	—	$0.10		$11.49	-0.811	526.8%	2	1
Call · $20 Snapshot session Mar 30, 2026 Last $0.10 Breakeven $20.10 Implied vol — Delta — Gamma — Theta — Vega — Open interest 134 Model this call Put · $20 In the money Snapshot session Jun 16, 2026 Last $11.49 Breakeven $8.51 Implied vol 526.8% Delta -0.811 ≈81% ITM Gamma 0.046 Theta -0.126 Vega 0.003 Open interest 1 Model this put
11	3	—	—	$0.40		—	-0.82	570.1%	—	0
Call · $22.5 Snapshot session Mar 12, 2026 Last $0.40 Breakeven $22.90 Implied vol — Delta — Gamma — Theta — Vega — Open interest 11 Model this call Put · $22.5 In the money Snapshot session Unknown Last — Breakeven — Implied vol 570.1% Delta -0.82 ≈82% ITM Gamma 0.041 Theta -0.132 Vega 0.003 Open interest 0 Model this put
6	5	—	—	$0.17		—	-0.827	609.1%	—	0
Call · $25 Snapshot session Dec 26, 2025 Last $0.17 Breakeven $25.17 Implied vol — Delta — Gamma — Theta — Vega — Open interest 6 Model this call Put · $25 In the money Snapshot session Unknown Last — Breakeven — Implied vol 609.1% Delta -0.827 ≈83% ITM Gamma 0.037 Theta -0.138 Vega 0.003 Open interest 0 Model this put
31	—	—	—	—		—	-0.837	677.4%	—	0
Call · $30 Snapshot session Unknown Last — Breakeven — Implied vol — Delta — Gamma — Theta — Vega — Open interest 31 Model this call Put · $30 In the money Snapshot session Unknown Last — Breakeven — Implied vol 677.4% Delta -0.837 ≈84% ITM Gamma 0.032 Theta -0.148 Vega 0.003 Open interest 0 Model this put

About this data

Each contract's last price, volume, greeks, implied volatility and open interest belongs to the snapshot session shown in its details; unknown means the provider omitted the timestamp. This chain has mixed snapshot sessions · Dec 26, 2025–Aug 14, 2026; 6 unknown. Cross-contract positioning totals are shown only when every returned row has the same known session. Bid and ask are not included on this plan.

In-the-money strikes are tinted, deepening toward the money, and the bar beside each open-interest figure scales to the heaviest strike shown.

Key facts CIK 1421517 CUSIP 29270J100 13F (30d) 195 filings 192 filers Visit website Investor relations