William Yeung insider trades: Energy Recovery (ERII) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where William reports to the SEC
Open-market buys and sales
21 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jul 28, 2026 | ERII | ↓ Sell10b5-1 | 2,048 | $8.56 | $18K | Direct | Jul 29, 2026 (1d) |
| Feb 6, 2026 | ERII | ↓ Sell10b5-1 | 1,536 | $14.82 | $23K | Direct | Feb 9, 2026 (3d) |
| Feb 2, 2026 | ERII | ↓ Sell10b5-1 | 8,000 | $14.54 | $116K | Direct | Feb 3, 2026 (1d) |
| Oct 24, 2025 | ERII | ↓ Sell10b5-1 | 12,698 | $17.86 | $227K | Direct | Oct 27, 2025 (3d) |
| Oct 20, 2025 | ERII | ↓ Sell10b5-1 | 3,530 | $17.00 | $60K | Direct | Oct 22, 2025 (2d) |
| Oct 16, 2025 | ERII | ↓ Sell10b5-1 | 3,530 | $16.50 | $58K | Direct | Oct 17, 2025 (1d) |
| Oct 3, 2025 | ERII | ↓ Sell10b5-1 | 3,567 | $16.00 | $57K | Direct | Oct 7, 2025 (4d) |
| Sep 18, 2025 | ERII | ↓ Sell10b5-1 | 15,454 | $15.09 | $233K | Direct | Sep 22, 2025 (4d) |
| Sep 11, 2025 | ERII | ↓ Sell | 33,554 | $14.51 | $487K | Direct | Sep 15, 2025 (4d) |
| Jul 29, 2024 | ERII | ↓ Sell | 2,012 | $14.63 | $29K | Direct | Jul 30, 2024 (1d) |
| Mar 11, 2024 | ERII | ↓ Sell | 978 | $14.98 | $15K | Direct | Mar 13, 2024 (2d) |
| Feb 5, 2024 | ERII | ↓ Sell | 1,013 | $14.89 | $15K | Direct | Feb 7, 2024 (2d) |
| Feb 2, 2024 | ERII | ↓ Sell | 2,133 | $15.42 | $33K | Direct | Feb 5, 2024 (3d) |
| Jan 30, 2024 | ERII | ↓ Sell | 823 | $15.91 | $13K | Direct | Feb 1, 2024 (2d) |
| Aug 28, 2023 | ERII | ↓ Sell | 40,614 | $27.75 | $1.1M | Direct | Aug 29, 2023 (1d) |
| Mar 9, 2023 | ERII | ↓ Sell | 882 | $23.99 | $21K | Direct | Mar 13, 2023 (4d) |
| Feb 3, 2023 | ERII | ↓ Sell | 836 | $22.75 | $19K | Direct | Feb 7, 2023 (4d) |
| Feb 2, 2023 | ERII | ↓ Sell | 3,707 | $22.41 | $83K | Direct | Feb 3, 2023 (1d) |
| Jun 15, 2022 | ERII | ↓ Sell | 2,500 | $19.07 | $48K | Spouse | Jun 17, 2022 (2d) |
| Mar 14, 2017 | ERII | ↑ Buy | 3,298 | $7.58 | $25K | By Spouse | Mar 14, 2017 (0d) |
| Nov 8, 2016 | ERII | ↑ Buy | 4,770 | $10.10 | $48K | By Spouse | Nov 9, 2016 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other ERII insiders
Open-market trades in the last 12 months
About William Yeung's insider trades
William Yeung is Chief Legal Officer at Energy Recovery (ERII). Since Nov 8, 2016, William has reported 2 open-market purchases worth $73K and 19 sales worth $2.7M on SEC Form 4. In the last 12 months: 3 sales ($157K).
8 sales (30% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include shares withheld for taxes (13 filings), grants and awards (13 filings), option exercises (6 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every ERII insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.