Option exercise and 10b5-1 sales reported by CYTK (NASDAQ: CYTK)

Rhea-AI Filing Summary

CYTK filing reports an exercise of stock options for 9,503 shares on 06/29/2026 settled for cash. The filing also lists recent Rule 10b5-1 sales by Sung Lee: 6,695 shares on 06/26/2026 for $562,380, 38,730 shares on 06/24/2026 for $3,187,328.11, and 23,906 shares on 05/05/2026 for $1,837,766.45. The Form 144 records the planned resale after option exercise and lists prior sales under a 10b5-1 plan.

Insights

Corporate Governance Analyst

Notice records option exercise plus recent 10b5-1 dispositions by an insider.

The filing shows an exercise of 9,503 shares settled in cash on 06/29/2026, and three prior Rule 10b5-1 sales by Sung Lee totaling 69,331 shares across 05/05/2026, 06/24/2026, and 06/26/2026. These entries reflect routine insider liquidity events and a scheduled trading plan rather than an unsolicited open-market decision.

Cash-flow treatment and remaining post-transaction holdings are not provided in the excerpt; subsequent filings would show final position counts. The activity is documented as sales under a 10b5-1 plan and an issuer-settled option exercise.

Key Figures

Option exercise: 9,503 shares 10b5-1 sale: 6,695 shares 10b5-1 sale: 38,730 shares +2 more

5 metrics

Option exercise 9,503 shares exercise of stock options on 06/29/2026

10b5-1 sale 6,695 shares sale on 06/26/2026 for $562,380

10b5-1 sale 38,730 shares sale on 06/24/2026 for $3,187,328.11

10b5-1 sale 23,906 shares sale on 05/05/2026 for $1,837,766.45

Total recent shares sold 69,331 shares aggregate of the three 10b5-1 sales listed

Key Terms

Form 144, 10b5-1 Sales, Exercise of Stock Options

3 terms

Form 144 regulatory

"144: Filer Information | 144: Issuer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

10b5-1 Sales regulatory

"10b5-1 Sales for SUNG LEE 350 OYSTER POINT BOULEVARD"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

Exercise of Stock Options financial

"Common | 06/29/2026 | Exercise of Stock Options"

FAQ

What does CYTK's Form 144 disclose about recent insider activity?

The Form 144 discloses a cash-settled option exercise of 9,503 shares on 06/29/2026 and prior 10b5-1 sales totaling 69,331 shares across May and June 2026.

Who executed the Rule 10b5-1 sales reported in the CYTK filing?

The reported Rule 10b5-1 sales were executed by Sung Lee, with specific trades of 23,906, 38,730, and 6,695 shares on the disclosed dates in 2026.

How much cash was raised in the 10b5-1 sales shown in the CYTK excerpt?

The excerpt lists proceeds of $1,837,766.45, $3,187,328.11, and $562,380 for the three reported 10b5-1 transactions in 2026.

Does the Form 144 show how the exercised options were settled for CYTK?

Yes; the filing indicates the 9,503-share option exercise on 06/29/2026 was settled for cash with the issuer listed as the counterparty.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 06/29/2026 - 04:48 PM Accepted by SEC EDGAR 06/29/2026 - 04:48 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001793200
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	CYTOKINETICS, INCORPORATED
SEC File Number	000-50633
Address of Issuer	350 OYSTER POINT BOULEVARD SOUTH SAN FRANCISCO CALIFORNIA 94080
Phone	6506243000
Name of Person for Whose Account the Securities are To Be Sold	Sung Lee
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	9503	781051.57	124432565	06/29/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	06/29/2026	Exercise of Stock Options	Issuer			9503	06/29/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for SUNG LEE 350 OYSTER POINT BOULEVARD SOUTH SAN FRANCISCO CA 94080	Common	06/26/2026	6695	562380.00
10b5-1 Sales for SUNG LEE 350 OYSTER POINT BOULEVARD SOUTH SAN FRANCISCO CA 94080	Common	06/24/2026	38730	3187328.11
10b5-1 Sales for SUNG LEE 350 OYSTER POINT BOULEVARD SOUTH SAN FRANCISCO CA 94080	Common	05/05/2026	23906	1837766.45

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	06/29/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/23/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Sung Lee
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)