Milestone Scientific MLSS Insider Ownership

NYSE MLSS
$0.30 +0.01 (+3.45%)
At close: Nov 13, 2026 · 4:00 PM EST

Insider Holdings by Owner

31.74Mn Shares
Giandomenico Trombetta10.42Mn32.8%
Leonard Osser9.00Mn28.3%
S.R.L. Bp48.90Mn28.0%
Neal I Goldman1.91Mn6.0%
Michael Mcgeehan575.27K1.8%
Other insiders (4)946.59K3.0%

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
19.90%
▼-13.67% pp QoQ
Shares Held by Insiders
18.53Mn
filed for Sep 2026
▼-40.72% QoQ
Shares Outstanding
93.13Mn
93,126,415 shares
Direct Holdings
14.08Mn
Indirect: 4.45Mn
Net Open-Market Trades
0
no open-market trades 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 —

Open-Market Insider Trades

Bought Sold
Latest quarter —
Net over range —
Net-buying quarters —

Insider Ownership Summary

Updated

Business Quant data puts insider holdings in MLSS at 18.53Mn shares across insiders' latest Form 4 filings.

Form 4 Holdings

Insiders Holding MLSS

Insiders 9
Shares held 31.74Mn
Of outstanding 34.08%
# 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

450 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