Every Form 4 that Energy Recovery, Inc. (ERII) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow ERII and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full ERII filings page.
Energy Recovery, Inc. director John Joseph Mitchell reported a grant/award acquisition of 15,186 shares of common stock dated July 9, 2026. The entry lists 15,186 shares following the transaction as directly held. A footnote describes the entry as a manual adjustment of securities owned due to administrative error.
Energy Recovery, Inc. SVP, Water Rodney Clemente reported transactions in company common stock. On July 28, 2026, he sold 5,387 shares at $8.56 per share in an open-market or private transaction pursuant to a Rule 10b5-1 trading plan. On July 27, 2026, 2,320 shares were disposed of at $8.42 per share to satisfy tax obligations through share withholding upon vesting under Rule 16b-3(e).
Energy Recovery, Inc. Chief Legal Officer William Yeung reported selling 2,048 shares of common stock on July 28, 2026 at $8.56 per share in an open-market or private transaction effected under a Rule 10b5-1 trading plan. On July 27, 2026, 2,828 shares were disposed of at $8.42 per share to satisfy tax obligations by withholding securities upon vesting under Rule 16b-3(e). Yeung also reports 5,568 shares of common stock held indirectly through his spouse.
Mitchell John Joseph reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. director John Joseph Mitchell received a grant of 16,797 restricted stock units of common stock on July 9, 2026. The award has a grant price of $0.0000 per share and will fully vest at the 2027 Annual Meeting, anticipated on or around June 3, 2027. Following this award, his reported direct holdings total 16,797 shares.
Ryan Aidan reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. reported that Interim CFO Ryan Aidan received a grant of common stock. On May 6, 2026, he was awarded 18,518 shares of common stock at a reference price of $11.61 per share. This was a grant or award transaction rather than an open-market purchase. Following this award, Aidan directly holds a total of 34,133 common shares of Energy Recovery, Inc.
Energy Recovery, Inc. director Colin R. Sabol reported an open-market purchase of 11,180 shares of common stock on June 15, 2026 at a weighted average price of $8.879 per share, from multiple trades priced between $8.535 and $8.93. Following the transaction, he directly owns 55,671 shares and also reports 3,000 shares held indirectly in a joint account with Julie Sabol.
Energy Recovery, Inc. interim President and CEO Alexander J. Buehler reported an option exercise and related share sale. On June 15, 2026, he exercised stock options to acquire 15,327 shares of common stock at $8.60 per share and then sold 14,900 shares in an open-market transaction at a weighted average price of $8.71 per share, with individual trades ranging from $8.60 to $8.86. The exercised options had been fully vested since June 23, 2017 and were set to expire on June 23, 2026. Following these transactions, Buehler directly holds 66,755 shares of Energy Recovery common stock.
TONDREAU PAMELA L. reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. director Pamela L. Tondreau reported an equity compensation grant of 22,316 shares of common stock at $8.29 per share. Following this grant, she holds 60,844 shares directly and 37,362 shares indirectly through The Bruce-Tondreau Living Trust. A related restricted stock unit is scheduled to fully vest at the 2027 annual meeting, anticipated on or around June 3, 2027.
Chow Joan Kai reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. director Joan Kai Chow received an equity grant of 18,094 shares of common stock as a grant or award, valued at $8.29 per share. This is a compensation-related award, not an open-market purchase.
The award relates to restricted stock units that will fully vest at the company’s 2027 annual meeting, anticipated to be on or around June 3, 2027. After this grant, Chow directly holds 52,116 shares of common stock and also indirectly holds 1,500 shares through a joint tenancy with right of survivorship.
Energy Recovery, Inc. director Colin R. Sabol reported a stock award of 18,094 shares of common stock on June 4, 2026. The award was recorded at a price of $8.29 per share as a grant or other acquisition, meaning it reflects equity compensation rather than an open-market purchase.
After this award, Sabol directly holds 44,491 shares of common stock and indirectly holds 3,000 shares through a joint tenancy with right of survivorship. A related footnote states that the restricted stock unit will fully vest at the 2027 annual meeting, anticipated to occur on or around June 3, 2027.
Hanstveit Arve reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. director Arve Hanstveit reported a stock award. He received 18,094 shares of common stock as a grant at $8.29 per share, increasing his direct holdings to 400,603 shares. The restricted stock unit will fully vest at the 2027 Annual Meeting, anticipated around June 3, 2027. He also reports 60,000 shares held in each of two irrevocable trusts, where he serves as sole trustee with sole voting and investment power.
Energy Recovery, Inc. director Pamela L. Tondreau reported an open-market purchase of 20,000 shares of common stock on May 13, 2026 through the Bruce-Tondreau Living Trust. The weighted average purchase price was $8.342 per share, with individual trades between $8.335 and $8.35. Following the purchase, the filing shows 37,362 shares held indirectly by the trust and a separate direct holding entry of 38,528 shares in her name. A footnote explains the trust total includes the 20,000 shares bought on May 13, 2026 plus 17,362 shares transferred to the trust in January 2026, for which she may be deemed to have beneficial ownership.
Energy Recovery, Inc. director Arve Hanstveit sold 2,419 shares of common stock at $10.29 per share in an open-market transaction on April 6, 2026. The sale was executed by a broker to satisfy a margin call after these shares had been pledged as collateral. Following the sale, Hanstveit directly holds 382,509 shares. He also has indirect ownership of 60,000 shares in the Sophie Hanstveit Irrevocable Trust and 60,000 shares in the Natasha Hanstveit Irrevocable Trust, where he serves as sole trustee with sole voting and investment power.
Energy Recovery, Inc. director Arve Hanstveit sold 165,292 shares of Common Stock at $10.14 per share. The sale was executed by a broker to satisfy a margin call on shares pledged as collateral in a margin account, rather than through a discretionary trade.
After the transaction, Hanstveit directly holds 384,928 shares. He also has indirect ownership of 60,000 shares in the Sophie Hanstveit Irrevocable Trust and 60,000 shares in the Natasha Hanstveit Irrevocable Trust, where he serves as sole trustee with sole voting and investment power.
Energy Recovery, Inc. director Arve Hanstveit reported an open‑market sale of 25,000 shares of common stock on March 10, 2026 at a weighted average price of $10.959 per share, with trades ranging from $10.83 to $11.11.
After the sale, he holds 550,220 shares directly. He also has indirect holdings of 60,000 shares in the Sophie Hanstveit Irrevocable Trust and 60,000 shares in the Natasha Hanstveit Irrevocable Trust, where he serves as sole trustee with sole voting and investment power.
Energy Recovery, Inc. director Arve Hanstveit sold a total of 50,000 shares of common stock in open-market transactions. On March 5, he sold 38,418 shares at a weighted average price of $10.71 per share, from multiple trades ranging between $10.71 and $10.7109 per share. On March 6, he sold an additional 11,582 shares at $10.615 per share. After these sales, he directly owned 575,220 shares of Energy Recovery common stock.
Energy Recovery, Inc. senior vice president of Water, Rodney Clemente, reported an open-market sale of common stock. He sold 20,568 shares at a weighted average price of $10.614 per share under a pre-arranged Rule 10b5-1 trading plan. After this transaction, he directly owned 116,008 shares.
Energy Recovery, Inc. Chief Technology Officer Ramanan Natarajan reported an open-market sale of common stock. On March 5, 2026, he sold 272 shares at a price of $10.57 per share. After this transaction, he directly owned 52,565 shares of Energy Recovery common stock.
Energy Recovery, Inc. Chief Technology Officer Ramanan Natarajan reported a tax-related share withholding. On the transaction date, 2,724 shares of common stock were disposed of at $10.22 per share to satisfy a tax obligation tied to vesting, under Rule 16b-3(e). After this withholding, he directly owned 52,837 common shares.
Mancini Michael S. reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. reported that Chief Financial Officer Michael S. Mancini received an equity grant in the form of employee restricted stock units. The award covers 45,626 restricted stock units, each representing one share of common stock to be delivered at settlement.
According to the grant terms, 25% of these restricted stock units will vest on each of the first four anniversaries of the grant date, subject to the usual conditions. Following this grant, Mancini directly holds 75,051 shares of the company’s common stock.
Energy Recovery, Inc. President and CEO David W. Moon reported an equity award in the form of common stock on a Form 4. He acquired 81,812 shares on February 17, 2026 as a grant at no cash cost to him.
The footnotes state these are employee restricted stock units, each representing one share of common stock. The units vest in four equal 25% installments on the first four anniversaries of the grant date. After this grant, his directly held common stock totals 233,069 shares, with an additional 36,950 shares held indirectly through the David and Rhonda Moon JCP.
Yeung William reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. reported that Chief Legal Officer William Yeung received an equity award of 25,959 restricted stock units on February 17, 2026. The footnotes state that 25% of these units will vest on each of the first four anniversaries of the grant date, spreading vesting over four years. Each restricted stock unit represents the right to receive one share of Energy Recovery common stock at settlement. Following this grant, Yeung directly holds 104,167 shares of common stock and also reports indirect ownership of 5,568 shares held by his spouse.
Ramanan Natarajan reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. reported that its Chief Technology Officer, Ramanan Natarajan, received an equity award in the form of restricted stock units. He was granted 29,106 employee restricted stock units of common stock, with no cash price per share listed for the grant.
According to the vesting terms, 25% of these restricted stock units will vest on each of the first four anniversaries of the grant date, spreading the award over four years. Each restricted stock unit represents the right to receive one share of Energy Recovery common stock at settlement, and following this award his directly held common stock position reported in the filing is 55,561 shares.
Energy Recovery, Inc. reported that SVP, Water Rodney Clemente acquired an award of 45,626 restricted stock units on the transaction date. The grant was priced at $0.0000 per unit, reflecting an equity compensation award rather than a market purchase.
According to the terms, 25% of the restricted stock units will vest on each of the first four anniversaries of the grant date, spreading the vesting over four years. Each restricted stock unit gives the right to receive one share of common stock upon settlement, bringing Clemente’s direct holdings to 136,576 shares after the award.
Hostetler Matthew reported acquisition or exercise transactions in this Form 4 filing.
Energy Recovery, Inc. reported that Chief Human Resources Officer Matthew Hostetler received an equity grant in the form of employee restricted stock units. The award covers 25,959 restricted stock units, each convertible into one share of common stock at settlement, with no cash paid per unit.
According to the vesting schedule, 25% of the restricted stock units will vest on each of the first four anniversaries of the grant date, creating a four-year vesting period. Following this award, Hostetler’s direct holdings total 46,556 shares of common stock, aligning his compensation further with the company’s long-term performance.
Energy Recovery Chief Legal Officer William Yeung reported pre‑planned stock sales under a Rule 10b5-1 trading plan. On February 5, 2026, he sold 890 shares of common stock at $14.59 each. On February 6, 2026, he sold an additional 646 shares at $15.14 each. After these transactions, he beneficially owned 78,208 shares of Energy Recovery common stock directly.
Energy Recovery, Inc. executive Rodney Clemente, SVP, Water, reported a small planned stock sale. On February 5, 2026, he sold 724 shares of common stock at $14.59 per share under a pre-arranged Rule 10b5-1 trading plan.
After this sale, Clemente still beneficially owns 90,950 shares of Energy Recovery common stock directly.
Energy Recovery, Inc. executive reports tax share withholding. SVP, Water Rodney Clemente reported two Form 4 transactions on January 30, 2026, both coded “F,” meaning shares were withheld to cover taxes on vesting, not sold in the open market.
The company withheld 694 shares of common stock at $14.65 per share and 8,397 shares at $14.30 per share to satisfy tax obligations tied to equity awards under Rule 16b-3(e). After these transactions, Clemente directly owned 91,674 shares of Energy Recovery common stock.
Energy Recovery, Inc. Chief Human Resources Officer Matthew Hostetler reported an automatic share withholding to cover taxes tied to vesting equity. On January 30, 2026, 3,359 shares of common stock were withheld at $14.30 per share under transaction code F. After this tax-related withholding, Hostetler directly beneficially owned 20,597 shares of Energy Recovery common stock.
Energy Recovery, Inc. Chief Financial Officer Michael S. Mancini reported a share withholding related to equity compensation. On 01/30/2026, 4,798 shares of common stock were withheld at a price of $14.30 per share to cover tax obligations upon vesting, as permitted under Rule 16b-3(e). After this transaction, Mancini beneficially owned 29,425 shares of Energy Recovery common stock directly.
Energy Recovery, Inc. (ERII) insider David W. Moon, the company’s President, CEO, and a director, reported a tax-related share withholding. On January 30, 2026, 17,160 shares of common stock were withheld at $14.30 per share to cover tax obligations tied to vesting equity awards.
After this transaction, Moon directly beneficially owned 151,257 shares of Energy Recovery common stock. The filing describes this as a payment of tax obligations through share withholding in accordance with Rule 16b‑3(e).
Energy Recovery, Inc. Chief Legal Officer William Yeung reported multiple insider stock transactions. On January 28, 2026, he sold 7,271 common shares at $14.55 per share under a Rule 10b5-1 trading plan. On February 2, 2026, he sold another 729 shares at $14.46 per share.
On January 30, 2026, 1,003 and 8,622 shares were withheld at $14.65 and $14.30 per share to cover tax obligations tied to vesting. After these transactions, Yeung directly owned 79,744 shares, with an additional 5,568 shares reported as indirectly owned through his spouse.