Ardelyx ARDX Insider Ownership

NASDAQ ARDX

$3.13 -0.08 (-2.49%)

At close: Oct 21, 2026 · 4:00 PM EDT

Insider Holdings by Owner

10.45Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

3.93%

▼-0.096% pp QoQ

Shares Held by Insiders

9.80Mn

filed for Sep 2026

▼-2.38% QoQ

Shares Outstanding

249.15Mn

249,147,061 shares

Direct Holdings

9.62Mn

Indirect: 179.71K

Net Shares Traded (QoQ)

-238.45K

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 10, 2026

Over the past year, ARDX insiders bought $1.95 million of stock (333.33K shares) and sold $4.3 million (762.97K shares) on the open market.

Behind Ardelyx's open-market trades in the past 12 months were one insider buying and 9 insiders selling.
Among ARDX insiders, David M. Mott (Director) bought the most stock on the open market in the past 12 months: $1.95 million (333.33K shares), most recently on February 20, 2026.
On the selling side, Michael Raab (President & CEO) was the top open-market seller of Ardelyx over the past 12 months, with $2.57 million sold (456.19K shares) and the latest sale on August 21, 2026.
Beyond open-market trades, insiders at Ardelyx received 1.18Mn shares in stock awards and acquired 206K shares through option exercises and conversions in the last 12 months.
Business Quant data shows Ardelyx insiders holding 9.8Mn shares in total in their latest Form 4 filings, down 2.38% from 10.03Mn shares at the end of Q2 2026 and up 14.50% from 8.56Mn shares at the end of Q3 2025.
Of the 9.8Mn shares held by Ardelyx insiders, 9.62Mn shares (98.17%) are held directly and 179.71K shares (1.83%) indirectly, through trusts, partnerships, family members and other entities.
The insider holdings in Ardelyx belong to 19 insiders who have reported on Form 4 within the past two years.
Ardelyx's three biggest insider holders are David M. Mott (Director, 3.35Mn shares), Michael Raab (President & CEO, 1.65Mn shares) and David P. Rosenbaum (Chief Development Officer, 448.38K shares), based on their latest Form 4 filings.
The holding of David M. Mott makes up 34.20% of all shares held by Ardelyx insiders.
Institutions owned 71.17% of ARDX shares as of Q2 2026; insiders' latest Form 4 filings account for about 3.93%, leaving roughly 24.90% with other investors, including the public.
Over the trailing 12 months, 16 insiders reported transactions in ARDX stock across 54 Form 4 filings.
Insider figures for ARDX include Form 4 filings through August 25, 2026.

Form 4 Holdings

Insiders Holding ARDX

Insiders 22

Shares held 10.45Mn

Of outstanding 4.20%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	David M Mott	Director	3,349,655	0	3,349,655	32.0%	18 Jun, 2026
2	Michael Raab	President Ceo	1,619,792	0	1,619,792	15.5%	25 Aug, 2026
3	Susan Rodriguez	Chief Commercial Officer	449,092	0	449,092	4.3%	23 May, 2024
4	David P. Rosenbaum	Chief Development Officer	297,005	151,373	448,378	4.3%	22 Nov, 2024
5	Richard J Rodgers	Director	439,998	0	439,998	4.2%	18 Jun, 2026
6	Eric Duane Foster	Chief Commercial Officer	409,410	0	409,410	3.9%	25 Aug, 2026
7	Justin A Renz	Chief Financial Officer	409,052	0	409,052	3.9%	25 Aug, 2025
8	Laura A Williams	Chief Patient Officer	367,456	0	367,456	3.5%	25 Aug, 2026
9	Mike Kelliher	Chief Business Officer	349,660	0	349,660	3.3%	25 Aug, 2026
10	William C Jr Bertrand	Director	329,507	0	329,507	3.2%	18 Jun, 2026
11	John E Bishop	Officer	317,095	0	317,095	3.0%	25 Aug, 2026
12	Robert Blanks	Officer	314,421	0	314,421	3.0%	22 Nov, 2024
13	Elizabeth A Grammer	Evp, General Counsel	299,895	0	299,895	2.9%	25 Nov, 2025
14	James Parker Brady	Chief Human Resources Officer	245,930	0	245,930	2.4%	25 Aug, 2026
15	Susan Hohenleitner	Chief Financial Officer	227,520	0	227,520	2.2%	25 Aug, 2026
16	Onaiza Cadoret-Manier	Director	178,156	0	178,156	1.7%	18 Jun, 2026
17	Muna Bhanji	Director	163,808	0	163,808	1.6%	18 Jun, 2026
18	Jan M Lundberg	Director	146,794	0	146,794	1.4%	16 Jun, 2023
19	Joseph James Reilly	Officer	145,854	0	145,854	1.4%	25 Aug, 2026
20	Robert Ora Felsch	Officer	91,560	0	91,560	0.9%	22 Aug, 2024
21	Merdad Parsey	Director	83,746	0	83,746	0.8%	18 Jun, 2026
22	Robert B Bazemore	Director	68,006	0	68,006	0.7%	18 Jun, 2026

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

1,229 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
21 Aug, 2026	Eric Duane Foster	Chief Commercial Officer	Disposed S	2,598	$3.86	$10.02K	415,374	Direct
21 Aug, 2026	Laura A Williams	Chief Patient Officer	Disposed S	3,486	$3.86	$13.45K	374,709	Direct
21 Aug, 2026	Susan Hohenleitner	Chief Financial Officer	Disposed S	1,558	$3.86	$6.01K	227,520	Direct
21 Aug, 2026	James Parker Brady	Chief Human Resources Officer	Disposed S	1,976	$3.86	$7.62K	259,090	Direct
21 Aug, 2026	Mike Kelliher	Chief Business Officer	Disposed S	3,104	$3.86	$11.97K	354,314	Direct
21 Aug, 2026	John E Bishop	Officer	Disposed S	17,281	$3.86	$66.65K	319,564	Direct
21 Aug, 2026	Michael Raab	President Ceo	Disposed S	15,009	$3.86	$57.89K	1,663,357	Direct
21 Aug, 2026	Joseph James Reilly	Officer	Disposed S	2,872	$3.86	$11.08K	146,964	Direct
21 Aug, 2026	Mike Kelliher	Chief Business Officer	Disposed S	2,652	$3.86	$10.23K	351,662	Direct
21 Aug, 2026	Michael Raab	President Ceo	Disposed S	15,976	$3.86	$61.62K	1,647,381	Direct
21 Aug, 2026	Eric Duane Foster	Chief Commercial Officer	Disposed S	3,389	$3.86	$13.07K	411,985	Direct
21 Aug, 2026	John E Bishop	Officer	Disposed S	2,469	$3.86	$9.52K	317,095	Direct
21 Aug, 2026	Joseph James Reilly	Officer	Disposed S	1,110	$3.86	$4.28K	145,854	Direct
21 Aug, 2026	James Parker Brady	Chief Human Resources Officer	Disposed S	13,160	$3.86	$50.76K	245,930	Direct
21 Aug, 2026	Laura A Williams	Chief Patient Officer	Disposed S	3,089	$3.86	$11.91K	371,620	Direct
21 Aug, 2026	Laura A Williams	Chief Patient Officer	Disposed S	2,430	$3.86	$9.37K	369,190	Direct
21 Aug, 2026	Michael Raab	President Ceo	Disposed S	8,411	$3.86	$32.44K	1,638,970	Direct
21 Aug, 2026	Mike Kelliher	Chief Business Officer	Disposed S	2,002	$3.86	$7.72K	349,660	Direct
21 Aug, 2026	Eric Duane Foster	Chief Commercial Officer	Disposed S	2,575	$3.86	$9.93K	409,410	Direct
21 Aug, 2026	Laura A Williams	Chief Patient Officer	Disposed S	1,734	$3.86	$6.69K	367,456	Direct

Showing 1 to 20 of 1,229 transactions