William P. Phelan serves as Executive at MECHANICAL TECHNOLOGY INC, where they oversee executive responsibilities. Since joining the company, William P. Phelan has executed 31 insider transactions totaling $293.0K, demonstrating a bullish approach to their equity position. Their most recent transaction on Dec 16, 2025 involved selling 1,300 shares valued at $1.8K.
William P. Phelan currently holds 1,318,715 shares of MECHANICAL TECHNOLOGY INC (MKTY), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, William P. Phelan has been a net buyer of MKTY stock. They have purchased $183.9K and sold $109.1K worth of shares.
William P. Phelan's most recent insider trade was on Dec 16, 2025, when they sold 1,300 shares at $1.41 per share.
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| $9.52 |
| Discretionary |
| Dec 10, 2025 | SLNHP | $67.1K | Sale | 7,001 | $9.58 | Discretionary |
| Dec 1, 2025 | SLNH | $0 | Award | 917,932 | $N/A | Discretionary |
| Nov 21, 2025 | SLNHP | $0 | Gift | 36,500 | $N/A | Discretionary |
| Nov 20, 2025 | SLNHP | $3.9K | Sale | 500 | $7.80 | Discretionary |
| Nov 19, 2025 | SLNHP | $758 | Sale | 100 | $7.58 | Discretionary |
| Sep 1, 2025 | SLNH | $0 | Award | 133,560 | $N/A | Discretionary |
| Sep 1, 2024 | SLNH | $0 | Award | 48,769 | $N/A | Discretionary |
| Sep 1, 2024 | SLNH | $0 | Award | 4,076 | $N/A | Discretionary |
| Jun 1, 2024 | SLNH | $0 | Award | 6,852 | $N/A | Discretionary |
| Apr 15, 2024 | SLNH | $0 | Award | 185,421 | $N/A | Discretionary |
| Apr 15, 2024 | SLNH | $0 | Award | 47,059 | $N/A | Discretionary |
| Aug 24, 2022 | SLNH | $655 | Purchase | 199.07 | $3.29 | Discretionary |
| Aug 24, 2022 | SLNH | $24.3K | Purchase | 7,458 | $3.26 | Discretionary |
| Jan 26, 2022 | SLNH | $0 | Award | 20,500 | $N/A | Discretionary |
| Jan 26, 2022 | SLNH | $0 | Award | 20,500 | $N/A | Discretionary |
| Jan 14, 2022 | SLNH | $0 | Award | 60,500 | $N/A | Discretionary |
| Jan 14, 2022 | SLNH | $0 | Award | 60,500 | $N/A | Discretionary |
| Mar 25, 2021 | MKTY | $0 | Award | 7,500 | $N/A | Discretionary |
| Feb 2, 2021 | MKTY | $14.0K | Option Exercise | 13,000 | $1.08 | Discretionary |
| Feb 2, 2021 | MKTY | $3.6K | Option Exercise | 12,500 | $0.29 | Discretionary |
| Feb 2, 2021 | MKTY | $6.5K | Option Exercise | 12,500 | $0.52 | Discretionary |
| Feb 2, 2021 | MKTY | $18.0K | Option Exercise | 15,000 | $1.20 | Discretionary |
| Feb 2, 2021 | MKTY | $14.0K | Option Exercise | 18,000 | $0.78 | Discretionary |
| Feb 2, 2021 | MKTY | $5.6K | Option Exercise | 6,250 | $0.90 | Discretionary |
| Jan 14, 2021 | MKTY | $0 | Option Exercise | 17,500 | $N/A | Discretionary |
| Nov 1, 2016 | MKTY | $44.3K | Purchase | 29,512 | $1.50 | Discretionary |
| Oct 31, 2016 | MKTY | $105.7K | Purchase | 70,488 | $1.50 | Discretionary |
| Aug 10, 2016 | MKTY | $8.9K | Purchase | 10,000 | $0.89 | Discretionary |