Milestone Scientific Inc. (MLSS) Insider Ownership

Historic Insider Ownership Trends

Milestone Scientific's top three insider shareholders as of April 28, 2026 are Giandomenico Trombetta (Director, 10.42Mn shares), S.R.L. Bp4 (TenPercentOwner, 8.90Mn shares), Leonard Osser (Interim Ceo, 4.61Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Giandomenico Trombetta - 10,418,382 0 30 Aug, 2024
S.R.L. Bp4 - 8,896,765 0 29 Oct, 2025
Leonard Osser Interim Ceo 4,606,882 0 23 Oct, 2024
Leonard Osser - 0 4,448,698 03 Jan, 2022
Leonard Osser Ceo 4,388,548 0 01 Feb, 2022
Leonard Osser - 0 4,381,260 02 Dec, 2021
Neal I Goldman - 1,905,858 0 30 Aug, 2024
Michael Mcgeehan - 575,273 0 20 Dec, 2024
Benedetta I Casamento - 404,491 0 30 Aug, 2024
Leonard M Schiller - 338,412 0 15 Jun, 2022
Peter J Milligan President 124,421 0 10 Aug, 2023
Leslie Bernhard - 79,268 0 19 Dec, 2022

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
22 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 14,427 $0.45 9,076,765 D S
23 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 80,000 $0.43 8,996,765 D S
24 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 100,000 $0.44 8,896,765 D S
20 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 24,034 $0.45 9,131,192 D S
21 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 40,000 $0.44 9,091,192 D S
10 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 10,158 $0.55 9,185,226 D S
13 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 10,000 $0.55 9,175,226 D S
14 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 30,000 $0.54 9,155,226 D S
07 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 10,000 $0.45 9,225,384 D S
08 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 30,000 $0.47 9,195,384 D S
03 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 9,210 $0.45 9,245,384 D S
03 Oct, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 10,000 $0.45 9,235,384 D S
11 Sep, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 10,000 $0.59 9,256,972 D S
17 Jul, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 10,000 $0.64 9,298,724 D S
03 Jul, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 50,853 $0.67 9,350,846 D S
07 Jul, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 30,558 $0.68 9,320,288 D S
08 Jul, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 11,489 $0.69 9,308,799 D S
23 Jun, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 5,933 $0.86 9,439,557 D S
24 Jun, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 10,000 $0.81 9,429,577 D S
25 Jun, 2025 S.R.L. Bp4 Common Stock, Par Value $0.001 D 1,300 $0.77 9,438,257 D S