Leonard Osser

Companies

• MILESTONE SCIENTIFIC INC.Board member Feb 3, 2010 to now¹
• MILESTONE SCIENTIFIC INC.Chief executive officer Feb 3, 2010 to Apr 29, 2021¹

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• MSMILESTONE SCIENTIFIC INC. MLSS9,055,580 shares²$3.0M at $0.33Oct 22, 2024

As of each latest filing. The line shows shares held over time.

Recent filings

• Sep 29, 2025Granted 83,333 shares of Nexalin Technology, Inc.³
• Oct 22, 2024Sold 107,984 shares at $0.93 of MILESTONE SCIENTIFIC INC.²
• Sep 23, 2024Granted 700,000 shares of Nexalin Technology, Inc.⁴
• Aug 28, 2024Granted 112,356 shares at $0.89 of MILESTONE SCIENTIFIC INC.⁵
• Aug 21, 2024Sold 141,913 shares at $0.95 of MILESTONE SCIENTIFIC INC.⁶
• Jun 28, 2023Granted 112,360 shares at $0.89 of MILESTONE SCIENTIFIC INC.⁷
• Sep 28, 2022Bought 9,500 shares at $1.12 of Nexalin Technology, Inc.⁸
• Sep 16, 2022Bought 36,000 shares at $4.15 of Nexalin Technology, Inc.⁹
• Jun 13, 2022Granted 30,488 shares at $0.82 of MILESTONE SCIENTIFIC INC.¹⁰
• Jun 13, 2022Granted 121,951 shares at $0.82 of MILESTONE SCIENTIFIC INC.¹¹
• Apr 18, 2022Sold 9,842 shares at $1.12 of MILESTONE SCIENTIFIC INC.¹²
• Apr 12, 2022Sold 8,500 shares at $1.18 of MILESTONE SCIENTIFIC INC.¹³
• Apr 11, 2022Sold 8,200 shares at $1.21 of MILESTONE SCIENTIFIC INC.¹³
• Apr 4, 2022Sold 14,100 shares at $1.42 of MILESTONE SCIENTIFIC INC.¹⁴
• Apr 1, 2022Sold 6,000 shares at $1.51 of MILESTONE SCIENTIFIC INC.¹⁴
• Mar 28, 2022Sold 7,110 shares at $1.33 of MILESTONE SCIENTIFIC INC.¹⁵
• Mar 22, 2022Sold 8,000 shares at $1.26 of MILESTONE SCIENTIFIC INC.¹⁶
• Mar 21, 2022Sold 7,600 shares at $1.30 of MILESTONE SCIENTIFIC INC.¹⁶
• Mar 15, 2022Sold 8,500 shares at $1.18 of MILESTONE SCIENTIFIC INC.¹⁷
• Mar 14, 2022Sold 8,100 shares at $1.23 of MILESTONE SCIENTIFIC INC.¹⁷
• Mar 8, 2022Sold 7,500 shares at $1.35 of MILESTONE SCIENTIFIC INC.¹⁸
• Mar 7, 2022Sold 6,400 shares at $1.53 of MILESTONE SCIENTIFIC INC.¹⁸
• Mar 1, 2022Sold 7,600 shares at $1.32 of MILESTONE SCIENTIFIC INC.¹⁹
• Feb 28, 2022Sold 7,500 shares at $1.33 of MILESTONE SCIENTIFIC INC.¹⁹
• Feb 23, 2022Sold 8,200 shares at $1.22 of MILESTONE SCIENTIFIC INC.²⁰