Cytokinetics: Robert Blum proposes $1.42M share sale

The notice describes the shares as coming from stock-option exercises over the next three months, with cash listed as payment.

Rhea-AI Filing Summary

Cytokinetics, Incorporated (CYTK) lists a sale by Robert Blum of 22,500 common shares, with an aggregate market value of $1,415,475.00 and an approximate sale date of October 12, 2026. The remarks state that the securities were and will be received through stock-option exercises over the next three months; exercise and sale dates were and will be the dates of acquisition and payment, and cash is listed as the payment method. The past-three-month table also lists 7,500 shares as a 10b5-1 sale for Robert Blum on September 28, 2026.

Key Figures

Shares listed for sale: 22,500 common shares Aggregate market value: $1,415,475.00 Past-period sale: 7,500 shares +1 more

4 metrics

Shares listed for sale 22,500 common shares Approximate sale date: October 12, 2026

Aggregate market value $1,415,475.00 For the 22,500 shares listed for sale

Past-period sale 7,500 shares Robert Blum; September 28, 2026; listed as a 10b5-1 sale

Past-period sale 97,926 common shares Bridget Blum 2026 Irrevocable Trust; September 15, 2026

Key Terms

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

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 Sales regulatory

"10b5-1 Sales for Robert Blum"

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

"Exercise of Stock Options"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many CYTK shares does Robert Blum's notice list for sale?

The notice lists 22,500 common shares for sale by Robert Blum, with an aggregate market value of $1,415,475.00 and an approximate sale date of October 12, 2026.

How will Robert Blum obtain the CYTK shares listed for sale?

The remarks state that the securities were and will be received upon exercise of stock options over the next three months. Cash is listed as the payment method, and acquisition and payment dates were and will be the exercise and sale dates.

What recent CYTK share sales are listed for Robert Blum and the Bridget Blum 2026 Irrevocable Trust?

The past-three-month table lists 97,926 common shares for the Bridget Blum 2026 Irrevocable Trust on September 15, 2026, and 7,500 shares for Robert Blum as a 10b5-1 sale on September 28, 2026.

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

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Available on EDGAR 10/13/2026 - 08:20 AM EDT Accepted by SEC EDGAR 10/13/2026 - 08:19 AM EDT 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	0001288859
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 Blvd. SOUTH SAN FRANCISCO CALIFORNIA 94080
Phone	6506243000
Name of Person for Whose Account the Securities are To Be Sold	ROBERT BLUM
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	Director
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	22500	1415475.00	139023418	10/12/2026	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	10/12/2026	Exercise of Stock Options	Issuer			22500	10/12/2026	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 ROBERT BLUM 350 Oyster Point Blvd. SOUTH SAN FRANCISCO CA 94080	Common	09/28/2026	7500	490953.75
The Bridget Blum 2026 Irrevocable Trust 350 Oyster Point Blvd. SOUTH SAN FRANCISCO CA 94080	Common	09/15/2026	97926	6789209.58
10b5-1 Sales for ROBERT BLUM 350 Oyster Point Blvd. SOUTH SAN FRANCISCO CA 94080	Common	09/14/2026	7500	550828.50
10b5-1 Sales for ROBERT BLUM 350 Oyster Point Blvd. SOUTH SAN FRANCISCO CA 94080	Common	08/31/2026	7500	526770.75
10b5-1 Sales for ROBERT BLUM 350 Oyster Point Blvd. SOUTH SAN FRANCISCO CA 94080	Common	08/10/2026	7500	575722.50
10b5-1 Sales for ROBERT BLUM 350 Oyster Point Blvd. SOUTH SAN FRANCISCO CA 94080	Common	07/27/2026	7500	606507.00
10b5-1 Sales for ROBERT BLUM 350 Oyster Point Blvd. SOUTH SAN FRANCISCO CA 94080	Common	07/13/2026	7500	615153.00

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. Sales that were executed on October 12, 2026 are being reported on this Form 144 filed on October 13, 2026 given the EDGAR system was not accepting filings on October 12, 2026 in observance of the federal holiday.
Date of Notice	10/12/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/24/2025
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/ Robert Blum
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)