Milestone Scientific MLSS Insider Ownership

NYSE MLSS

$0.29 -0.02 (-6.45%)

At close: Oct 23, 2026 · 4:00 PM EDT

Insider Holdings by Owner

31.74Mn Shares

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 Shares Traded (QoQ)

-12.73Mn

net selling in Sep 2026

Insiders Holding Shares

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

Updated Oct 23, 2026

Over the past year, MLSS insiders sold $78,396 of stock (180K shares) on the open market and bought none.

The largest open-market sales of MLSS in the past 12 months were by S.R.L. Bp4 (10% owner), totaling $78,396 (180K shares), most recently on October 24, 2025.
Business Quant data puts insider holdings in MLSS at 18.53Mn shares across insiders' latest Form 4 filings.
Of the 18.53Mn shares held by Milestone Scientific insiders, 14.08Mn shares (75.99%) are held directly and 4.45Mn shares (24.01%) indirectly, through trusts, partnerships, family members and other entities.
MLSS's insider total is spread across 3 insiders who have filed a Form 4 in the past two years.
MLSS's three largest insider shareholders, per their latest Form 4 filings, are Leonard Osser (Director, 9.06Mn shares), S.R.L. Bp4 (10% owner, 8.9Mn shares) and Michael McGeehan (Director, 575.27K shares).
The holding of Leonard Osser makes up 48.88% of all shares held by Milestone Scientific insiders.
Institutions accounted for 5.77% of MLSS's outstanding shares in Q2 2026, insiders about 19.90% per their latest Form 4 filings, and other investors, including the public, about 74.33%.
A total of 2 Form 4 filings with transactions in Milestone Scientific stock were made over the past 12 months, by one insider.
These insider figures for Milestone Scientific are based on Form 4 filings through October 29, 2025.

Form 4 Holdings

Insiders Holding MLSS

Insiders 9

Shares held 31.74Mn

Of outstanding 34.08%

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

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

Showing 1 to 20 of 450 transactions