Robert Arthur Harrington

CIK 1923988 · View on SEC EDGAR ↗

Insider

First SEC filing: May 27, 2026 · Latest: May 27, 2026

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.

Insider at

CYTK selling Dec. 1, 2025

Insider transactions

0 buys (P) 2 sells (S) Net: $-248,260 + 25 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

25 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
July 15, 2026	CYTK	A	151	$82.62	$12,476	21,932 Direct	+0.69%	Acquired	-7.3% (price as of 2026-08-20)
May 27, 2026	CYTK	A	4,301	—	—	4,301 Direct	—	Acquired	(price as of 2026-08-20)
May 27, 2026	CYTK	A	2,851	—	—	21,781 Direct	+15.06%	Acquired	(price as of 2026-08-20)
April 15, 2026	CYTK	A	191	$65.37	$12,486	18,930 Direct	+1.02%	Acquired	17.1% (price as of 2026-08-20)
Jan. 15, 2026	CYTK	A	197	$63.44	$12,498	18,739 Direct	+1.06%	Acquired	20.7% (price as of 2026-08-20)
Dec. 1, 2025	CYTK	S	2,150	$66.80	$143,620	18,542 Direct	-10.39%	Disposed	14.6% (price as of 2026-08-20)
Oct. 15, 2025	CYTK	A	199	$62.80	$12,497	20,692 Direct	+0.97%	Acquired	21.9% (price as of 2026-08-20)
Sept. 2, 2025	CYTK	S	2,150	$48.67	$104,640	20,493 Direct	-9.50%	Disposed	57.3% (price as of 2026-08-20)
July 15, 2025	CYTK	A	328	$38.01	$12,467	22,643 Direct	+1.47%	Acquired	101.4% (price as of 2026-08-20)
May 14, 2025	CYTK	A	10,880	—	—	10,880 Direct	—	Acquired	(price as of 2026-08-20)
May 14, 2025	CYTK	A	7,333	—	—	22,315 Direct	+48.95%	Acquired	(price as of 2026-08-20)
April 15, 2025	CYTK	A	324	$38.56	$12,493	14,982 Direct	+2.21%	Acquired	98.5% (price as of 2026-08-20)
April 3, 2025	CYTK	S	450	$39.43	$17,744	14,658 Direct	-2.98%	Disposed	94.1% (price as of 2026-08-20)
March 4, 2025	CYTK	S	900	$42.50	$38,250	15,108 Direct	-5.62%	Disposed	80.1% (price as of 2026-08-20)
Jan. 2, 2025	CYTK	A	255	$48.93	$12,477	16,008 Direct	+1.62%	Acquired	56.5% (price as of 2026-08-20)
Oct. 1, 2024	CYTK	A	237	$52.60	$12,466	15,753 Direct	+1.53%	Acquired	45.5% (price as of 2026-08-20)
July 5, 2024	CYTK	S	253	$54.61	$13,816	15,516 Direct	-1.60%	Disposed	40.2% (price as of 2026-08-20)
July 1, 2024	CYTK	A	228	—	—	15,769 Direct	+1.47%	Acquired	(price as of 2026-08-20)
June 3, 2024	CYTK	S	1,580	$48.64	$76,851	15,541 Direct	-9.23%	Disposed	57.4% (price as of 2026-08-20)
May 15, 2024	CYTK	A	5,600	—	—	17,121 Direct	+48.61%	Acquired	(price as of 2026-08-20)
May 15, 2024	CYTK	A	3,636	—	—	3,636 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 2, 2024	CYTK	A	148	$84.12	$12,450	11,521 Direct	+1.30%	Acquired	-9.0% (price as of 2026-08-20)
Oct. 2, 2023	CYTK	A	448	$27.88	$12,490	11,373 Direct	+4.10%	Acquired	174.6% (price as of 2026-08-20)
July 3, 2023	CYTK	A	374	$33.36	$12,477	10,925 Direct	+3.54%	Acquired	129.5% (price as of 2026-08-20)
May 10, 2023	CYTK	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
May 10, 2023	CYTK	A	5,000	—	—	10,551 Direct	+90.07%	Acquired	(price as of 2026-08-20)
April 3, 2023	CYTK	A	298	$37.71	$11,238	5,551 Direct	+5.67%	Acquired	103.0% (price as of 2026-08-20)
Jan. 3, 2023	CYTK	A	253	$44.35	$11,221	5,253 Direct	+5.06%	Acquired	72.6% (price as of 2026-08-20)
May 10, 2022	CYTK	A	10,000	—	—	10,000 Direct	—	Acquired	(price as of 2026-08-20)
May 10, 2022	CYTK	A	5,000	—	—	5,000 Direct	—	Acquired	(price as of 2026-08-20)
April 8, 2022	CYTK	A	35,000	$41.69	$1,459,150	35,000 Direct	—	Acquired	83.6% (price as of 2026-08-20)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
May 27, 2026	CYTK	Non-Qualified Stock Option (Right to Buy)	Common Stock (4,301)	$77.15	May 26, 2036	4,301	Acquired
May 14, 2025	CYTK	Non-Qualified Stock Option (Right to Buy)	Common Stock (10,880)	$30.00	May 13, 2035	10,880	Acquired
May 15, 2024	CYTK	Non-Qualified Stock Option (Right to Buy)	Common Stock (3,636)	$60.50	May 15, 2034	3,636	Acquired
May 10, 2023	CYTK	Non-Qualified Stock Option (Right to Buy)	Common Stock (10,000)	$37.89	May 10, 2033	10,000	Acquired
May 10, 2022	CYTK	Non-Qualified Stock Option (right to buy)	Common Stock (10,000)	$37.89	May 10, 2032	10,000	Acquired
April 8, 2022	CYTK	Non-Qualified Stock Option (right to buy)	Common Stock (35,000)	$41.69	April 8, 2032	35,000	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).