Zentalis Pharmaceuticals ZNTL Insider Ownership

NASDAQ ZNTL

$2.39 +0.09 (+3.91%)

At close: Oct 20, 2026 · 4:00 PM EDT

Insider Holdings by Owner

31.79Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

38.56%

▲+6.06% pp QoQ

Shares Held by Insiders

27.64Mn

filed for Sep 2026

▲+18.65% QoQ

Shares Outstanding

71.67Mn

71,668,568 shares

Direct Holdings

21.18Mn

Indirect: 6.46Mn

Net Shares Traded (QoQ)

+4.34Mn

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

Across the past 12 months, open-market trades by Zentalis Pharmaceuticals insiders totaled $22.92 million in purchases (10.79Mn shares) and $10.11 million in sales (7.56Mn shares).

Zentalis Pharmaceuticals' open-market purchases in the past 12 months came from one insider, and its sales from 4 insiders.
Among Zentalis Pharmaceuticals' insiders, the largest open-market purchases in the past 12 months were by Group Walters (10% owner), totaling $22.92 million (10.79Mn shares), most recently on August 14, 2026.
Conversely, Matrix Capital Management Company, LP (10% owner) was ZNTL's largest open-market seller in the past 12 months, with $9.97 million of sales (7.5Mn shares); the latest was on December 15, 2025.
Away from the open market, ZNTL insiders received 181.03K shares in stock awards over the last 12 months.
According to Business Quant data, insiders at Zentalis Pharmaceuticals reported 27.64Mn shares in total in their latest Form 4 filings, or 38.56% of the 71.67Mn shares outstanding; that total is up 18.65% from 23.29Mn shares at the end of Q2 2026.
Of the 27.64Mn shares held by Zentalis Pharmaceuticals insiders, 21.18Mn shares (76.62%) are held directly and 6.46Mn shares (23.38%) indirectly, through trusts, partnerships, family members and other entities.
The insider holdings in Zentalis Pharmaceuticals belong to 13 insiders who have reported on Form 4 within the past two years.
Zentalis Pharmaceuticals' top three insider holders by shares held are Group Walters (10% owner, 17.84Mn shares), Matrix Capital Management Company, LP (10% owner, 6.46Mn shares) and Andrea Paul (Chief Legal Officer, 1.07Mn shares).
The largest insider, Group Walters, holds 64.57% of ZNTL's insider total.
Over the trailing 12 months, 12 insiders reported transactions in ZNTL stock across 18 Form 4 filings.
The insider data for ZNTL reflects Form 4 filings through September 30, 2026.

Form 4 Holdings

Insiders Holding ZNTL

Insiders 23

Shares held 31.79Mn

Of outstanding 44.35%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Group Walters	TenPercentOwner	17,844,973	0	17,844,973	56.1%	19 Aug, 2026
2	Capital Management Company, Lp Matrix	TenPercentOwner	0	6,459,973	6,459,973	20.3%	15 Dec, 2025
3	Anthony Y Sun	President Ceo	1,175,589	0	1,175,589	3.7%	05 Apr, 2022
4	Andrea Paul	Chief Legal Officer	1,070,784	0	1,070,784	3.4%	05 Feb, 2025
5	Kevin D. Bunker	Chief Scientific Officer	834,931	0	834,931	2.6%	21 Dec, 2023
6	Cam Gallagher	President, Interim Cfo	633,680	0	633,680	2.0%	31 May, 2024
7	Mark Lackner	Chief Scientific Officer	512,856	0	512,856	1.6%	05 Feb, 2025
8	Kimberly Blackwell	Chief Executive Officer	484,145	0	484,145	1.5%	05 Feb, 2024
9	Melissa B, Epperly	Chief Financial Officer	451,449	0	451,449	1.4%	12 Feb, 2024
10	Scott Dunseth Myers	Director	395,895	0	395,895	1.2%	18 Jun, 2026
11	Diana Hausman	Chief Medical Officer	373,876	0	373,876	1.2%	09 May, 2024
12	David Michael Johnson	Director	307,521	0	307,521	1.0%	18 Jun, 2026
13	Jan Skvarka	Director	264,254	0	264,254	0.8%	18 Jun, 2026
14	Luke Nathaniel Walker	Director	201,384	0	201,384	0.6%	18 Jun, 2026
15	Enoch Kariuki	Director	194,465	0	194,465	0.6%	18 Jun, 2026
16	Vincent Vultaggio	Pao And Pfo	146,506	0	146,506	0.5%	10 Feb, 2026
17	Shannon Campbell	Director	114,200	0	114,200	0.4%	27 May, 2026
18	Carrie Brownstein	Chief Medical Officer	105,685	0	105,685	0.3%	06 Oct, 2023
19	Julia Marie Eastland	Ceo President	79,133	0	79,133	0.2%	10 Feb, 2026
20	Iris Roth	Chief Operating Officer	52,500	0	52,500	0.2%	02 Mar, 2023
21	Ingmar Bruns	Chief Medical Officer	43,059	0	43,059	0.1%	30 Sep, 2026
22	Alexis Pinto	Chief Legal Officer	22,240	0	22,240	0.1%	14 Feb, 2022
23	Dimitris Voliotis	Svp, Clinical Development	15,978	0	15,978	0.1%	14 Feb, 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

605 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
30 Sep, 2026	Ingmar Bruns	Chief Medical Officer	Acquired A	9,727	$2.18	$21.20K	43,059	Direct
14 Aug, 2026	Group Walters	TenPercentOwner	Acquired P	4,335,000	$3.50	$15.17Mn	17,844,973	Direct
16 Jun, 2026	Jan Skvarka	Director	Acquired A	57,100	$0.00	$0	264,254	Direct
16 Jun, 2026	Enoch Kariuki	Director	Acquired A	57,100	$0.00	$0	194,465	Direct
16 Jun, 2026	Scott Dunseth Myers	Director	Acquired A	57,100	$0.00	$0	395,895	Direct
16 Jun, 2026	David Michael Johnson	Director	Acquired A	57,100	$0.00	$0	307,521	Direct
16 Jun, 2026	Luke Nathaniel Walker	Director	Acquired A	57,100	$0.00	$0	201,384	Direct
26 May, 2026	Shannon Campbell	Director	Acquired A	114,200	$0.00	$0	114,200	Direct
06 Feb, 2026	Julia Marie Eastland	Ceo President	Disposed S	7,866	$2.43	$19.11K	80,022	Direct
06 Feb, 2026	Vincent Vultaggio	Pao And Pfo	Disposed S	29,951	$2.43	$72.77K	156,779	Direct
06 Feb, 2026	Ingmar Bruns	Chief Medical Officer	Disposed S	2,962	$2.43	$7.20K	33,667	Direct
09 Feb, 2026	Ingmar Bruns	Chief Medical Officer	Disposed S	335	$2.39	$802	33,332	Direct
09 Feb, 2026	Julia Marie Eastland	Ceo President	Disposed S	889	$2.39	$2.13K	79,133	Direct
09 Feb, 2026	Vincent Vultaggio	Pao And Pfo	Disposed S	3,379	$2.39	$8.09K	153,400	Direct
10 Feb, 2026	Vincent Vultaggio	Pao And Pfo	Disposed S	6,894	$2.42	$16.70K	146,506	Direct
02 Feb, 2026	Vincent Vultaggio	Pao And Pfo	Disposed S	2,540	$2.55	$6.48K	187,286	Direct
03 Feb, 2026	Vincent Vultaggio	Pao And Pfo	Disposed S	556	$2.52	$1.40K	186,730	Direct
08 Jan, 2026	Ingmar Bruns	Chief Medical Officer	Acquired A	365,000	$0.00	$0	365,000	Direct
08 Jan, 2026	James B Bucher	Chief Legal Officer	Acquired A	100,000	$0.00	$0	100,000	Direct
08 Jan, 2026	Julia Marie Eastland	Ceo President	Acquired A	775,000	$0.00	$0	775,000	Direct

Showing 1 to 20 of 605 transactions