Leonard Osser serves as Executive at MILESTONE SCIENTIFIC INC., where they oversee executive responsibilities. Since joining the company, Leonard Osser has executed 98 insider transactions totaling $2.1M, demonstrating a bearish approach to their equity position. Their most recent transaction on Sep 29, 2025 involved receiving (via award) 83,333 shares valued at $0.
Leonard Osser currently holds 1,618,577 shares of MILESTONE SCIENTIFIC INC. (MLSS.OB), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Leonard Osser has been a net seller of MLSS.OB stock. They have purchased $401.8K and sold $1.7M worth of shares.
Leonard Osser's most recent insider trade was on Sep 29, 2025, when they sold 83,333 shares at $0.00 per share.
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| $N/A |
| Discretionary |
| Aug 28, 2024 | MLSS | $100.0K | Award | 112,356 | $0.89 | Discretionary |
| Aug 21, 2024 | MLSS | $134.8K | Sale | 141,913 | $0.95 | Discretionary |
| Jun 28, 2023 | MLSS | $100.0K | Award | 112,360 | $0.89 | Discretionary |
| Sep 28, 2022 | NXL | $10.6K | Purchase | 9,500 | $1.12 | Discretionary |
| Sep 16, 2022 | NXL | $149.4K | Purchase | 36,000 | $4.15 | Discretionary |
| Jun 13, 2022 | MLSS | $100.0K | Award | 121,951 | $0.82 | Discretionary |
| Jun 13, 2022 | MLSS | $25.0K | Award | 30,488 | $0.82 | Discretionary |
| Apr 18, 2022 | MLSS | $11.0K | Sale | 9,842 | $1.12 | Discretionary |
| Apr 12, 2022 | MLSS | $10.0K | Sale | 8,500 | $1.18 | Discretionary |
| Apr 11, 2022 | MLSS | $9.9K | Sale | 8,200 | $1.21 | Discretionary |
| Apr 4, 2022 | MLSS | $20.0K | Sale | 14,100 | $1.42 | Discretionary |
| Apr 1, 2022 | MLSS | $9.1K | Sale | 6,000 | $1.51 | Discretionary |
| Mar 28, 2022 | MLSS | $9.5K | Sale | 7,110 | $1.33 | Discretionary |
| Mar 22, 2022 | MLSS | $10.1K | Sale | 8,000 | $1.26 | Discretionary |
| Mar 21, 2022 | MLSS | $9.9K | Sale | 7,600 | $1.30 | Discretionary |
| Mar 15, 2022 | MLSS | $10.0K | Sale | 8,500 | $1.18 | Discretionary |
| Mar 14, 2022 | MLSS | $10.0K | Sale | 8,100 | $1.23 | Discretionary |
| Mar 8, 2022 | MLSS | $10.1K | Sale | 7,500 | $1.35 | Discretionary |
| Mar 7, 2022 | MLSS | $9.8K | Sale | 6,400 | $1.53 | Discretionary |
| Mar 1, 2022 | MLSS | $10.0K | Sale | 7,600 | $1.32 | Discretionary |
| Feb 28, 2022 | MLSS | $10.0K | Sale | 7,500 | $1.33 | Discretionary |
| Feb 23, 2022 | MLSS | $10.0K | Sale | 8,200 | $1.22 | Discretionary |
| Feb 22, 2022 | MLSS | $9.9K | Sale | 7,700 | $1.29 | Discretionary |
| Feb 15, 2022 | MLSS | $10.0K | Sale | 8,100 | $1.24 | Discretionary |
| Feb 14, 2022 | MLSS | $10.0K | Sale | 8,400 | $1.19 | Discretionary |
| Feb 8, 2022 | MLSS | $9.9K | Sale | 7,600 | $1.30 | Discretionary |
| Feb 7, 2022 | MLSS | $10.1K | Sale | 8,000 | $1.26 | Discretionary |
| Feb 1, 2022 | MLSS | $10.1K | Sale | 7,650 | $1.32 | Discretionary |