Cytokinetics CYTK Insider Ownership

NASDAQ CYTK

$63.95 +1.30 (+2.08%)

At close: Oct 20, 2026 · 4:00 PM EDT

Insider Holdings by Owner

1.36Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

0.678%

▼-0.105% pp QoQ

Shares Held by Insiders

942.17K

filed for Sep 2026

▼-13.42% QoQ

Shares Outstanding

139.02Mn

139,023,418 shares

Direct Holdings

942.17K

Indirect: 0

Net Shares Traded (QoQ)

-146.05K

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 12 months, Cytokinetics insiders sold $51.8 million of stock on the open market (745.14K shares) and made no open-market purchases.

A count shows 10 insiders selling CYTK stock on the open market over the past 12 months and none buying.
The largest open-market sales of CYTK in the past 12 months were by Robert I. Blum (President & CEO), totaling $17.29 million (249.96K shares), most recently on September 28, 2026.
The latest open-market trade in CYTK stock by an insider was a sale of 3.5K shares for $214,830 by Fady Ibraham Malik (EVP Research & Development) on October 6, 2026.
Apart from open-market trades, CYTK insiders received 252.06K shares in stock awards, acquired 511.97K shares through option exercises and conversions, gave up 46.77K shares to cover taxes or exercise prices and gave away 101.28K shares as gifts in the past 12 months.
Business Quant data puts insider holdings in CYTK at 942.16K shares across insiders' latest Form 4 filings, or 0.68% of the 139.02Mn shares outstanding; that total is down 13.42% from 1.09Mn shares at the end of Q2 2026 and down 1.82% from 959.58K shares at the end of Q3 2025.
Cytokinetics insiders report no indirect holdings: all 942.16K shares are held directly.
Holdings in Cytokinetics stock are reported by 16 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
CYTK's three largest insider shareholders, per their latest Form 4 filings, are Robert I. Blum (President & CEO, 278.54K shares), Fady Ibraham Malik (EVP Research & Development, 153.9K shares) and Jeffrey Hessekiel (Chief Legal & Administrative Officer, 107.94K shares).
Robert I. Blum holds 29.56% of the combined insider position in Cytokinetics.
In the last 12 months, 126 Form 4 filings with transactions in CYTK stock came from 14 insiders.
The insider data for CYTK reflects Form 4 filings through October 6, 2026.

Form 4 Holdings

Insiders Holding CYTK

Insiders 23

Shares held 1.36Mn

Of outstanding 0.982%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Robert I Blum	President Ceo	278,544	278,544	20.4%	13 Oct, 2026
2	Fady Ibraham Malik	Evp Research Development	153,902	153,902	11.3%	06 Oct, 2026
3	David Cragg	Chief Hr Admin Officer	153,233	153,233	11.2%	08 Mar, 2022
4	Jeffrey Hessekiel	Chief Legal Admin Officer	107,943	107,943	7.9%	17 Mar, 2026
5	Mark A Schlossberg	Svp Legal General Counsel	103,408	103,408	7.6%	15 Mar, 2022
6	Ching Jaw	Svp Finance Cfo	87,346	87,346	6.4%	07 Mar, 2023
7	John T Henderson	Director	78,360	78,360	5.7%	16 Jul, 2026
8	Sung Lee	Evp, Chief Financial Officer	63,221	63,221	4.6%	02 Jul, 2026
9	Andrew Callos	Evp, Chief Commercial Officer	58,555	58,555	4.3%	31 Aug, 2026
10	Wendell Wierenga	Director	35,563	35,563	2.6%	16 Jul, 2026
11	Nancy Wysenski	Director	33,992	33,992	2.5%	16 Jul, 2026
12	Brett A Pletcher	Evp, Chief Legal Officer	33,140	33,140	2.4%	03 Sep, 2024
13	Wendall Wierenga	Director	32,345	32,345	2.4%	16 Jul, 2025
14	Muna Bhanji	Director	26,361	26,361	1.9%	27 May, 2026
15	Robert Arthur Harrington	Director	21,932	21,932	1.6%	16 Jul, 2026
16	Santo J Costa	Director	20,600	20,600	1.5%	16 May, 2024
17	Sandford D Smith	Director	18,801	18,801	1.4%	03 Jan, 2024
18	Robert Wong	Vp, Chief Accounting Officer	18,655	18,655	1.4%	05 Dec, 2024
19	B Lynne Parshall	Director	10,784	10,784	0.8%	01 Sep, 2026
20	Edward M. Md Kaye	Director	10,434	10,434	0.8%	16 Jul, 2026
21	Robert E Landry	Director	8,184	8,184	0.6%	15 Sep, 2026
22	Robert Califf	Director	6,003	6,003	0.4%	04 Jan, 2022
23	James M Daly	Director	3,390	3,390	0.2%	16 Jul, 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

3,073 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
12 Oct, 2026	Robert I Blum	President Ceo	Acquired M	7,500	$10.60	$79.50K	286,044	Direct
12 Oct, 2026	Robert I Blum	President Ceo	Disposed S	7,500	$62.88	$471.60K	278,544	Direct
12 Oct, 2026	Robert I Blum	President Ceo	Disposed M	7,500	$0.00	$0	141,745	Direct
06 Oct, 2026	Fady Ibraham Malik	Evp Research Development	Acquired M	3,500	$7.80	$27.30K	157,402	Direct
06 Oct, 2026	Fady Ibraham Malik	Evp Research Development	Disposed S	3,500	$61.38	$214.83K	153,902	Direct
06 Oct, 2026	Fady Ibraham Malik	Evp Research Development	Disposed M	3,500	$0.00	$0	19,886	Direct
28 Sep, 2026	Robert I Blum	President Ceo	Acquired M	7,500	$10.60	$79.50K	286,044	Direct
28 Sep, 2026	Robert I Blum	President Ceo	Disposed S	7,500	$65.46	$490.95K	278,544	Direct
28 Sep, 2026	Robert I Blum	President Ceo	Disposed M	7,500	$0.00	$0	149,245	Direct
22 Sep, 2026	Fady Ibraham Malik	Evp Research Development	Acquired M	3,500	$7.80	$27.30K	157,402	Direct
22 Sep, 2026	Fady Ibraham Malik	Evp Research Development	Disposed S	3,500	$68.29	$239.02K	153,902	Direct
22 Sep, 2026	Fady Ibraham Malik	Evp Research Development	Disposed M	3,500	$0.00	$0	23,386	Direct
14 Sep, 2026	Robert I Blum	President Ceo	Acquired M	7,500	$10.60	$79.50K	385,320	Direct
15 Sep, 2026	Robert E Landry	Director	Disposed S	1,000	$72.13	$72.13K	8,184	Direct
14 Sep, 2026	Robert I Blum	President Ceo	Disposed S	7,500	$73.44	$550.80K	377,820	Direct
14 Sep, 2026	Robert I Blum	President Ceo	Disposed G	1,350	$0.00	$0	376,470	Direct
14 Sep, 2026	Robert I Blum	President Ceo	Disposed G	97,926	$0.00	$0	278,544	Direct
14 Sep, 2026	Robert I Blum	President Ceo	Acquired G	97,926	$0.00	$0	97,926	Indirect
15 Sep, 2026	Robert I Blum	President Ceo	Disposed S	97,926	$69.33	$6.79Mn	0	Indirect
14 Sep, 2026	Robert I Blum	President Ceo	Disposed M	7,500	$0.00	$0	156,745	Direct

Showing 1 to 20 of 3,073 transactions