CorMedix CRMD Insider Ownership

NASDAQ CRMD

$7.76 +0.18 (+2.44%)

As of: Oct 21, 2026 · 11:41 AM EDT

Insider Holdings by Owner

2.45Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

3.11%

▲+0.031% pp QoQ

Shares Held by Insiders

2.44Mn

filed for Sep 2026

▲+0.99% QoQ

Shares Outstanding

78.44Mn

78,444,000 shares

Direct Holdings

2.44Mn

Indirect: 0

Net Shares Traded (QoQ)

+23.99K

net buying 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 10, 2026

Over the past year, CRMD insiders bought $275,500 of stock (25K shares) and sold $2.64 million (237K shares) on the open market.

Behind CorMedix's open-market trades in the past 12 months were one insider buying and 4 insiders selling.
Among CorMedix insiders, Myron Kaplan (Director) led open-market buying over the past 12 months with $275,500 of purchases (25K shares); the latest was on October 23, 2025.
On the selling side, Janet Dillione (Director) was the top open-market seller of CorMedix over the past 12 months, with $1.55 million sold (147K shares) and the latest sale on January 21, 2026.
Away from the open market, CRMD insiders received 668.5K shares in stock awards, acquired 250.49K shares through option exercises and conversions and gave up 141.26K shares to cover taxes or exercise prices over the last 12 months.
Business Quant data puts insider holdings in CRMD at 2.44Mn shares across insiders' latest Form 4 filings, up 0.99% from 2.42Mn shares at the end of Q2 2026.
By type of ownership, CRMD insiders hold all of their 2.44Mn shares directly.
Holdings in CorMedix stock are reported by 13 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
CorMedix's three largest insider shareholders, based on their latest Form 4 filings, are Joseph Todisco (Chief Executive Officer, 774.75K shares), Elizabeth Hurlburt (Chief Operating Officer, 270.46K shares) and Kaufman Beth Zelnick (Chief Legal Officer, 260.68K shares).
Joseph Todisco alone accounts for 31.74% of the shares held by CorMedix insiders.
Institutions owned 56.11% of CRMD shares as of Q2 2026; insiders' latest Form 4 filings account for about 3.11%, leaving roughly 40.78% with other investors, including the public.
A total of 32 Form 4 filings with transactions in CorMedix stock were made over the past 12 months, by 11 insiders.
The insider data for CRMD reflects Form 4 filings through September 18, 2026.

Form 4 Holdings

Insiders Holding CRMD

Insiders 14

Shares held 2.45Mn

Of outstanding 3.12%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Joseph Todisco	Chief Executive Officer	774,749	774,749	31.6%	06 Feb, 2026
2	Elizabeth Hurlburt	Chief Operating Officer	270,463	270,463	11.0%	01 Sep, 2026
3	Kaufman Beth Zelnick	Chief Legal Officer	260,684	260,684	10.6%	01 Sep, 2026
4	Myron Kaplan	Director	231,487	231,487	9.4%	27 Jan, 2026
5	Michael David Seckler	Chief Commercial Officer	133,156	133,156	5.4%	15 Jan, 2026
6	Steven W Lefkowitz	Director	125,951	125,951	5.1%	27 Jan, 2026
7	Susan Blum	Chief Financial Officer	124,315	124,315	5.1%	01 Sep, 2026
8	Janet Dillione	Director	117,835	117,835	4.8%	18 Sep, 2026
9	Erin Mistry	Evp, Chief Commercial Officer	100,992	100,992	4.1%	14 Jan, 2025
10	Matthew T David	Chief Financial Officer	95,270	95,270	3.9%	14 Jan, 2025
11	Alan W Dunton	Director	70,703	70,703	2.9%	27 Jan, 2026
12	Gregory Scott Duncan	Director	68,786	68,786	2.8%	27 Jan, 2026
13	Robert A Stewart	Director	66,453	66,453	2.7%	27 Jan, 2026
14	Paulo F Costa	Director	10,000	10,000	0.4%	18 May, 2023

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

730 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
18 Sep, 2026	Janet Dillione	Director	Acquired M	48,909	—	—	117,835	Direct
18 Sep, 2026	Janet Dillione	Director	Disposed M	48,909	—	—	0	Direct
29 Aug, 2026	Elizabeth Hurlburt	Chief Operating Officer	Disposed F	8,076	$8.30	$67.03K	270,463	Direct
29 Aug, 2026	Susan Blum	Chief Financial Officer	Disposed F	8,424	$8.30	$69.92K	124,315	Direct
29 Aug, 2026	Kaufman Beth Zelnick	Chief Legal Officer	Disposed F	8,424	$8.30	$69.92K	260,684	Direct
04 Feb, 2026	Kaufman Beth Zelnick	Chief Legal Officer	Acquired A	36,006	$0.00	$0	269,108	Direct
04 Feb, 2026	Elizabeth Hurlburt	Chief Operating Officer	Acquired A	36,006	$0.00	$0	278,539	Direct
04 Feb, 2026	Joseph Todisco	Chief Executive Officer	Acquired A	77,156	$0.00	$0	774,749	Direct
26 Jan, 2026	Alan W Dunton	Director	Acquired A	30,453	$0.00	$0	70,703	Direct
23 Jan, 2026	Joseph Todisco	Chief Executive Officer	Acquired A	225,900	$0.00	$0	724,899	Direct
26 Jan, 2026	Steven W Lefkowitz	Director	Acquired A	30,453	$0.00	$0	125,951	Direct
23 Jan, 2026	Kaufman Beth Zelnick	Chief Legal Officer	Acquired A	72,820	$0.00	$0	241,905	Direct
26 Jan, 2026	Janet Dillione	Director	Acquired A	30,453	$0.00	$0	68,926	Direct
26 Jan, 2026	Gregory Scott Duncan	Director	Acquired A	30,453	$0.00	$0	68,786	Direct
26 Jan, 2026	Myron Kaplan	Director	Acquired A	30,453	$0.00	$0	231,487	Direct
23 Jan, 2026	Susan Blum	Chief Financial Officer	Acquired A	72,820	$0.00	$0	142,506	Direct
23 Jan, 2026	Elizabeth Hurlburt	Chief Operating Officer	Acquired A	93,010	$0.00	$0	253,311	Direct
26 Jan, 2026	Robert A Stewart	Director	Acquired A	30,453	$0.00	$0	66,453	Direct
23 Jan, 2026	Susan Blum	Chief Financial Officer	Disposed F	9,767	$7.27	$71.01K	132,739	Direct
23 Jan, 2026	Joseph Todisco	Chief Executive Officer	Disposed F	27,306	$7.27	$198.51K	697,593	Direct

Showing 1 to 20 of 730 transactions