CYTK: Broker files Rule 144 after insider 10b5-1 sales (CYTK)

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC submitted a Rule 144 notice concerning proposed sales of Common stock tied to restricted stock units and prior 10b5-1 sales. The filing lists 6,695 Restricted Stock Units to be sold with a 05/31/2026 date and records prior 10b5-1 sales by Sung Lee: 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.

Insights

Securities Compliance Specialist

Rule 144 notice lists planned RSU sale and documents recent 10b5-1 dispositions.

The filing shows a broker-submitted Rule 144 notice for Common stock, including 6,695 Restricted Stock Units dated 05/31/2026. It also documents two prior 10b5-1 sales by Sung Lee: 38,730 shares on 06/24/2026 and 23,906 shares on 05/05/2026.

These entries are procedural disclosures describing sale notices and completed plan sales; cash-flow treatment or purchaser identities are not provided in the excerpt. Subsequent filings or transfer agent records would confirm settlement and any change in beneficial ownership.

Key Figures

Restricted Stock Units to be sold: 6,695 shares 10b5-1 sale - 06/24/2026: 38,730 shares 10b5-1 sale - 05/05/2026: 23,906 shares

3 metrics

Restricted Stock Units to be sold 6,695 shares RSUs dated 05/31/2026

10b5-1 sale - 06/24/2026 38,730 shares Proceeds reported <money>$3,187,328.11</money>

10b5-1 sale - 05/05/2026 23,906 shares Proceeds reported <money>$1,837,766.45</money>

Key Terms

Rule 144, 10b5-1, Restricted Stock Units

3 terms

Rule 144 regulatory

"Submitted a Rule 144 notice concerning proposed sales of Common stock"

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 regulatory

"10b5-1 Sales for SUNG LEE ... 06/24/2026"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Restricted Stock Units financial

"Securities To Be Sold Common | 05/31/2026 | Restricted Stock Units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

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Available on EDGAR 06/26/2026 - 04:25 PM Accepted by SEC EDGAR 06/26/2026 - 04:24 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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	6695	540956.00	124432565	06/26/2026	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	05/31/2026	Restricted Stock Units	Issuer			6695	05/31/2026	N/A

* 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	06/24/2026	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

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 for CYTK show?

It shows a Rule 144 notice and related sale activity for CYTK shares. The filing lists 6,695 Restricted Stock Units dated 05/31/2026 and records two prior 10b5-1 sales by Sung Lee on 06/24/2026 and 05/05/2026.

How many shares did Sung Lee sell under 10b5-1 plans?

The excerpt records sales of 38,730 shares on 06/24/2026 and 23,906 shares on 05/05/2026. Reported gross proceeds were $3,187,328.11 and $1,837,766.45, respectively.

Are the Restricted Stock Units already sold for CYTK?

The filing lists 6,695 Restricted Stock Units with a 05/31/2026 date indicating the units to be sold under the notice. The filing text does not state settlement or proceeds for those units.

Who submitted the Rule 144 notice for CYTK?

The notice was submitted by Morgan Stanley Smith Barney LLC (Executive Financial Services). The filing identifies the broker and the security class as Common stock.