Energy Recovery Inc
Energy Recovery Inc (ERII) Options Open Interest
ERII options open interest is 37,894 contracts. The 2-week average daily volume is 482 contracts across the chain.
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Monitoring ERII open interest helps you see where real money is positioned on Energy Recovery Inc's options and which strikes are attracting the most commitment from traders. Energy Recovery Inc's open interest reflects the total number of outstanding contracts that have not been closed or exercised, making it a powerful gauge of liquidity, conviction, and potential support and resistance zones. Use our scanner to monitor ERII options open interest in real time and find the strikes that matter.
Open interest is distinct from volume: volume counts how many contracts are traded in a session, while open interest counts how many remain open at the end of the day. Rising ERII options open interest alongside rising volume suggests new positions are being built, while falling open interest signals positions are being closed. Heavy open interest at specific strikes often acts as a magnet near expiration and can hint at where dealers and large traders expect Energy Recovery Inc to settle.
Energy Recovery, Inc., together with its subsidiaries, designs, manufactures, and sells various solutions for the seawater reverse osmosis desalination and industrial wastewater treatment industries worldwide. The company operates through Water and Emerging Technologies segments. It offers a suite of products, including energy recovery devices, and high-pressure feed and recirculation pumps; hydraulic turbochargers and boosters; and spare parts, as well as repair, field, and commissioning services. The company also offers a solution to reduce energy consumption in natural gas processing and in refrigeration systems that use carbon dioxide.
It provides its products under the ERI, Ultra PX, PX, Pressure Exchanger, PX Pressure Exchanger, PX PowerTrain, VorTeq, IsoBoost, AT, and AquaBold names to large engineering, procurement, and construction firms; end-users and industry consultants; original equipment manufacturers; and aftermarket customers. The company was incorporated in 1992 and is headquartered in San Leandro, California.
Pin risk into expiration, dealer positioning, liquidity checks for large orders — all of it starts with knowing where ERII open interest is concentrated. Our scanner maps Energy Recovery Inc's open interest across every strike and expiry, flags unusual buildups, and lets you drill into the contracts that institutional money is actually holding. Trade Energy Recovery Inc's options open interest as the signal it is, not as an afterthought.
| 7.50 | 0.05 | 0.55 | 0.30 | 62% | +0.4070 | 16 |
| 5.00 | 1.80 | 2.45 | 2.13 | 17% | +1.0000 | 10 |
| 10.00 | — | 0.05 | 0.05 | 86% | +0.0772 | 1 |
| 2.50 | 4.00 | 5.20 | 4.60 | 51% | +1.0000 | 0 |
| 12.50 | — | 0.75 | 0.75 | 273% | +0.3229 | 0 |
| 7.50 | 0.25 | 0.90 | 0.58 | 49% | -0.6289 | 2 |
| 2.50 | — | 0.75 | 0.75 | 580% | -0.0737 | 0 |
| 5.00 | — | 0.75 | 0.75 | 267% | -0.1939 | 0 |
| 10.00 | 2.40 | 3.60 | 3.00 | 114% | -0.8463 | 0 |
| 12.50 | 4.90 | 6.10 | 5.50 | 161% | -0.8762 | 0 |
As of September 23, 2026
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