Updated Jul 16, 2026 · Last SEC filing 2026-06-25
Energy Recovery, Inc. (ERII) has filed 8 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-25. 5 Form 8-K material event filings were reported by ERII in the last 90 days. 1 Form 144 notices of proposed sale were filed for ERII stock. InsiderAlpha tracks every ERII SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Special Industry Machinery, NEC (SIC 3559) |
|---|---|
| SEC CIK | 0001421517 |
| Form 4 filings (90d) | 8 |
|---|---|
| Form 8-K filings (90d) | 5 |
| Form 144 notices (90d) | 1 |
| Latest Form 4 filing | 2026-06-25 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| BUEHLER ALEXANDER J | Interim President and CEO | S — Open-market sale | 14.9K | $8.71 | $130K | SEC | |
| BUEHLER ALEXANDER J | Interim President and CEO | M — Option exercise | 15.3K | $8.60 | $132K | SEC | |
| Sabol Colin R | Director | P — Open-market purchase | 11.2K | $8.88 | $99K | SEC | |
| Sabol Colin R | Director | A — Grant or award | 18.1K | $8.29 | $150K | SEC | |
| TONDREAU PAMELA L. | Director | A — Grant or award | 22.3K | $8.29 | $185K | SEC | |
| Hanstveit Arve | Director | A — Grant or award | 18.1K | $8.29 | $150K | SEC | |
| Chow Joan Kai | Director | A — Grant or award | 18.1K | $8.29 | $150K | SEC | |
| TONDREAU PAMELA L. | Director | P — Open-market purchase | 20.0K | $8.34 | $167K | SEC | |
| Ryan Aidan | Interim CFO | A — Grant or award | 18.5K | $11.61 | $215K | SEC | |
| Hanstveit Arve | Director | S — Open-market sale | 2.4K | $10.29 | $25K | SEC | |
| Hanstveit Arve | Director | S — Open-market sale | 165.3K | $10.14 | $1.68M | SEC | |
| Hanstveit Arve | Director | S — Open-market sale | 25.0K | $10.96 | $274K | SEC | |
| Hanstveit Arve | Director | S — Open-market sale | 11.6K | $10.62 | $123K | SEC | |
| Hanstveit Arve | Director | S — Open-market sale | 38.4K | $10.71 | $411K | SEC | |
| Ramanan Natarajan | Chief Technology Officer | S — Open-market sale | 272 | $10.57 | $3K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for Energy Recovery, Inc. (ERII). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| BUEHLER ALEXANDER J | 3 | $393K |
| TONDREAU PAMELA L. | 2 | $352K |
| Sabol Colin R | 2 | $249K |
| Chow Joan Kai | 1 | $150K |
| Hanstveit Arve | 1 | $150K |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in ERII insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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