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ERII Energy Recovery, Inc. Insider Trading

Latest: Director Bought $167K of Shares · May 2026

Multiple insiders have been active at Energy Recovery, Inc. (ERII): 4 distinct insiders account for 5 buy filings and 1 sell filing as of Jun 2026. Its highest-significance filing in the last 90 days: Director Pamela L. Tondreau bought $167K, transaction dated May 2026.

6 filings analyzed · Latest 2026-06-17

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Buys
5
Sells
1
Insiders
4
Direction
Net buying

Energy Recovery, Inc. leadership

CEO
David W. Moon — PRINCIPAL EXECUTIVE OFFICER
CFO
Michael S. Mancini — PRINCIPAL FINANCIAL OFFICER
General Counsel
William W. Yeung — Chief Legal Officer
Chair
Pamela L. Tondreau — Chair of the Board

Historically, medium-priority insider buys have outperformed the S&P 500 by a median ~1% over the 30 days after the trade — the edge is concentrated in that first month (n ≈ 7,162, 2024-2026). Past results don't predict the future. How we measure this ↗

June 2026
2026-06-17
medium
11,180 shares
$99,267
@ $8.88
Significance 4

Director Colin R Sabol buys 11,180 shares of ERII at $8.88; stock now -50.9% from 52-week high, down 7.6% in 90 days.

Colin R Sabol, a director at Energy Recovery Inc., purchased 11,180 shares at $8.88 on 2026-06-15, increasing his holdings by 25.1% to 55,671 shares. The transaction occurs as ERII trades at $8.99, which is -50.9% from its 52-week high of $18.32 and -7.6% lower than 90 days ago. The company is currently unprofitable with a net loss of $12.3M against quarterly revenue of $9.7M, and annual revenue declined 6.9% year-over-year. Sabol's prior two purchases at ERII (in November 2023) both failed to generate positive 90-day returns, with outcomes of -15.8% and -12.8% respectively—neither purchase proved well-timed. This latest buy at a depressed price point follows a pattern of unsuccessful timing on the same ticker, providing limited confidence in the directional signal.

May 2026
2026-05-15
high
20,000 shares
$166,840
@ $8.34
Significance 7

Director Tondreau buys 20,000 shares of ERII at $8.34, totaling $166,840.00, near the 52-week low with stock -54.1% from its peak.

Pamela L. Tondreau, a Director at Energy Recovery, Inc., purchased 20,000 shares at $8.34 on 2026-05-13 for a total of $166,840.00, more than doubling her position from 17,362 shares to 37,362 shares. The purchase was made with ERII trading -54.1% below its 52-week high of $18.32 and following a 90-day decline of -46.1%, placing the transaction near the low end of the 52-week range of $8.14–$18.32. Tondreau's cross-ticker open-market buy history shows 2 prior buys with an avg 90-day return of +16.5% and a 90-day win rate of 100.00%, though this cross-ticker record reflects a small sample and is distinct from her ticker-specific history at ERII. At ERII specifically, she has 2 prior recorded trades: a May 2025 buy that produced a 90-day return of +16.5%, and a November 2023 buy whose outcome is not yet measurable; the fundamentals show the company posting net income of $-12,251,000.00 on revenue of $9,706,000.00 in the latest quarter with annual revenue growth of -6.9%, context that investors will weigh alongside the director's purchase size.

April 2026
2026-04-06
high
165,292 shares
$1,676,061
@ $10.14
Significance 5

Director Hanstveit sold 165,292 shares at $10.14 for $1.7M, reducing stake 30.0%; stock down 42.5% from $18.11 high

Director Arve Hanstveit sold 165,292 shares at $10.14 on 2026-04-02 with a post-transaction holding of 384,928 shares, representing a 30.0% reduction of his prior position. The sale occurred at a price 2.7% below the current market price of $10.42 and significantly below the 52-week high of $18.11—the stock has declined 42.5% from its peak and 27.7% over the past 90 days. Against a backdrop of deteriorating momentum (90-day change: -27.7%), a narrowing P/E of 28.16, and recent annual revenue contraction of -6.9%, the substantial reduction in this director's holdings reflects material portfolio adjustment at a depressed valuation. The size and timing warrant scrutiny given the company's recent financial headwinds and the director's continued but materially reduced exposure.

May 2025
2025-05-15
low
4,200 shares
$51,570
@ $12.28
Significance 3

Director Pamela L. Tondreau purchases 4,200 shares of ERII at $12.28; stock down 38.4% from 52-week high, company reports $-9.9M net loss this quarter.

Tondreau purchased 4,200 shares at $12.28 on 2025-05-14, increasing her holdings to 41,043 shares. The transaction occurred at a price -38.4% from the 52-week high of $19.93 and -18.6% below the 30-day average. Energy Recovery reported revenue of $8,065,000.00 in the latest quarter but a net loss of $-9,880,000.00, indicating the company is unprofitable. Tondreau's prior buy at ERII on 2023-11-07 returned -18.9% over 90 days, establishing a pattern of purchases that have not recovered within the tracked period. The company's annual revenue growth of +12.9% suggests operational scaling, yet current losses and depressed valuation relative to recent highs warrant monitoring of whether this director purchase signals confidence in a turnaround or reflects other considerations.

2025-05-15
medium
President and CEO
4,200 shares
$51,240
@ $12.20
Significance 6

CEO David W Moon purchases 4,200 shares of ERII at $12.20; stock down -38.4% from 52-week high, CEO holdings increase to 37.0K shares

Moon David W, President and CEO, purchased 4,200 shares at $12.20 on 2025-05-13, increasing his holdings from 32.8K to 37.0K shares (+12.8%). The stock is trading at $12.28 (current), down -38.4% from its 52-week high of $19.93 and down -18.6% over the past 30 days. Moon's prior trades at ERII show a mixed pattern: his 2024-08-05 buy delivered +15.8% over 90 days, his 2024-05-07 buy delivered +19.1%, but his 2024-02-27 buy returned -12.4% at the 90-day mark—2 of 3 prior trades were well-timed at the 90-day measure. Fundamentally, the company posted $8.1M quarterly revenue with a -$9.9M net loss, though annual revenue grew +12.9% year-over-year. The CEO's purchase arrives during a period of significant stock depreciation and negative near-term momentum, yet his same-ticker history suggests his prior accumulations at lower prices eventually generated gains for at least two-thirds of his prior 90-day windows.

August 2024
2024-08-07
medium
President and CEO
3,000 shares
$48,009
@ $16.00
Significance 4

CEO Moon David W purchased 3,000 shares of ERII at $16.00; stock now $15.95, down 42.9% from 52-week high.

CEO Moon David W purchased 3,000 shares at $16.00 on 2024-08-05, increasing his holdings from 29,750 to 32,750 shares (+10.1%). This marks his fourth open-market purchase at ERII in less than a year. However, the stock's fundamentals show a company in financial strain: net income stands at -$642,000 on quarterly revenue of $27.2M, with a high P/E of 44.31 suggesting elevated valuation relative to earnings. The trade timing reveals a cautionary pattern—of three prior buys at ERII since November 2023, only one (May 2024) delivered positive 90-day returns; the others saw declines of 12.4% and 16.3% within 90 days. At $15.95 today, the stock trades 42.9% below its 52-week high despite a recent 30-day surge of +25.8%, raising questions about the sustainability of the rebound and the wisdom of accumulation at this juncture.

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