William Yeung serves as Executive at Energy Recovery, Inc., where they oversee executive responsibilities. Since joining the company, William Yeung has executed 58 insider transactions totaling $2.6M, demonstrating a bearish approach to their equity position. Their most recent transaction on Feb 6, 2026 involved selling 646 shares valued at $9.8K.
William Yeung currently holds 78,208 shares of Energy Recovery, Inc. (ERII), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, William Yeung has been a net seller of ERII stock. They have purchased $73.2K and sold $2.5M worth of shares.
William Yeung's most recent insider trade was on Feb 6, 2026, when they sold 646 shares at $15.14 per share.
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| $14.59 |
| Discretionary |
| Oct 24, 2025 | ERII | $26.5K | Option Exercise | 3,530 | $7.50 | Discretionary |
| Oct 24, 2025 | ERII | $101.5K | Sale | 5,638 | $18.00 | Discretionary |
| Oct 24, 2025 | ERII | $57.5K | Option Exercise | 5,638 | $10.19 | Discretionary |
| Oct 24, 2025 | ERII | $63.5K | Sale | 3,530 | $18.00 | Discretionary |
| Oct 23, 2025 | ERII | $26.5K | Option Exercise | 3,530 | $7.50 | Discretionary |
| Oct 23, 2025 | ERII | $61.8K | Sale | 3,530 | $17.50 | Discretionary |
| Oct 20, 2025 | ERII | $60.0K | Sale | 3,530 | $17.00 | Discretionary |
| Oct 20, 2025 | ERII | $26.5K | Option Exercise | 3,530 | $7.50 | Discretionary |
| Oct 16, 2025 | ERII | $26.5K | Option Exercise | 3,530 | $7.50 | Discretionary |
| Oct 16, 2025 | ERII | $58.2K | Sale | 3,530 | $16.50 | Discretionary |
| Oct 3, 2025 | ERII | $40.5K | Sale | 2,529 | $16.00 | Discretionary |
| Oct 3, 2025 | ERII | $7.8K | Option Exercise | 1,038 | $7.50 | Discretionary |
| Oct 3, 2025 | ERII | $19.0K | Option Exercise | 2,529 | $7.50 | Discretionary |
| Oct 3, 2025 | ERII | $16.6K | Sale | 1,038 | $16.00 | Discretionary |
| Sep 18, 2025 | ERII | $138.3K | Option Exercise | 15,454 | $8.95 | Discretionary |
| Sep 18, 2025 | ERII | $233.2K | Sale | 15,454 | $15.09 | Discretionary |
| Sep 11, 2025 | ERII | $276.3K | Option Exercise | 30,877 | $8.95 | Discretionary |
| Sep 11, 2025 | ERII | $486.9K | Sale | 33,554 | $14.51 | Discretionary |
| Jul 25, 2025 | ERII | $27.6K | Payment | 1,989 | $13.88 | Discretionary |
| Jul 29, 2024 | ERII | $29.4K | Sale | 2,012 | $14.63 | Discretionary |
| Mar 11, 2024 | ERII | $14.7K | Sale | 978 | $14.98 | Discretionary |
| Feb 5, 2024 | ERII | $15.1K | Sale | 1,013 | $14.89 | Discretionary |
| Feb 2, 2024 | ERII | $21.4K | Sale | 1,400 | $15.30 | Discretionary |
| Feb 1, 2024 | ERII | $11.5K | Sale | 733 | $15.64 | Discretionary |
| Jan 30, 2024 | ERII | $13.1K | Sale | 823 | $15.91 | Discretionary |
| Jan 25, 2024 | ERII | $0 | Award | 39,542 | $N/A | Discretionary |
| Aug 28, 2023 | ERII | $1.1M | Sale | 40,614 | $27.75 | Discretionary |
| Jul 25, 2023 | ERII | $0 | Award | 16,674 | $N/A | Discretionary |