Milestone Scientific MLSS Insider Ownership

NYSE MLSS
$0.40 -0.04 (-8.86%)
As of: Sep 9, 2026 · 3:59 PM EDT

Insider Holdings by Owner

31.74Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
2.32%
■0% pp QoQ
Shares Held by Insiders
1.91Mn
filed for Sep 2026
■0.00% QoQ
Shares Outstanding
82.32Mn
82,322,910 shares
Direct Holdings
1.91Mn
Indirect: 0
Net Shares Traded (QoQ)
0
no net change in Sep 2026
Insiders Holding Shares
9
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 30 Sep, 2026

Milestone Scientific's three largest insider shareholders as of September 09, 2026 are Giandomenico Trombetta (Director, 10.42Mn shares), S.R.L. Bp4 (TenPercentOwner, 8.90Mn shares), Leonard Osser (Director, 8.83Mn shares).

Form 4 Holdings

Insiders Holding MLSS

Insiders 9
Shares held 31.74Mn
Of outstanding 38.55%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Giandomenico Trombetta Director 10,418,382 0 10,418,382 32.8% 30 Aug, 2024
2 Leonard Osser Interim Ceo 8,995,430 0 8,995,430 28.3% 23 Oct, 2024
3 S.R.L. Bp4 TenPercentOwner 8,896,765 0 8,896,765 28.0% 29 Oct, 2025
4 Neal I Goldman Director 1,905,858 0 1,905,858 6.0% 30 Aug, 2024
5 Michael Mcgeehan Director 575,273 0 575,273 1.8% 20 Dec, 2024
6 Benedetta I Casamento Director 404,491 0 404,491 1.3% 30 Aug, 2024
7 Leonard M Schiller Director 338,412 0 338,412 1.1% 15 Jun, 2022
8 Peter J Milligan President 124,421 0 124,421 0.4% 10 Aug, 2023
9 Leslie Bernhard Director 79,268 0 79,268 0.2% 19 Dec, 2022

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

972 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
22 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 14,427 $0.45 $6.49K 9,076,765 Direct
23 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 80,000 $0.43 $34.42K 8,996,765 Direct
24 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 100,000 $0.44 $43.98K 8,896,765 Direct
20 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 24,034 $0.45 $10.88K 9,131,192 Direct
21 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 40,000 $0.44 $17.59K 9,091,192 Direct
10 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 10,158 $0.55 $5.59K 9,185,226 Direct
13 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 10,000 $0.55 $5.50K 9,175,226 Direct
14 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 30,000 $0.54 $16.19K 9,155,226 Direct
07 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 10,000 $0.45 $4.50K 9,225,384 Direct
08 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 30,000 $0.47 $13.95K 9,195,384 Direct
03 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 9,210 $0.45 $4.14K 9,245,384 Direct
03 Oct, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 10,000 $0.45 $4.50K 9,235,384 Direct
11 Sep, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 10,000 $0.59 $5.94K 9,256,972 Direct
17 Jul, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 10,000 $0.64 $6.40K 9,298,724 Direct
03 Jul, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 50,853 $0.67 $34.06K 9,350,846 Direct
07 Jul, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 30,558 $0.68 $20.80K 9,320,288 Direct
08 Jul, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 11,489 $0.69 $7.93K 9,308,799 Direct
23 Jun, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 5,933 $0.86 $5.10K 9,439,557 Direct
24 Jun, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 10,000 $0.81 $8.05K 9,429,577 Direct
25 Jun, 2025 S.R.L. Bp4 TenPercentOwner Disposed S 1,300 $0.77 $1.00K 9,438,257 Direct