SEPN Form 144: 8,428 Shares From Option Exercise

Morgan Stanley Smith Barney LLC submitted a Form 144 notice reporting an intended sale of 8,428 shares of Common Stock on 06/12/2026 arising from an exercise of stock options with cash used as the method of payment.

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC submitted a Form 144 notice reporting an intended sale of 8,428 shares of Common Stock on 06/12/2026 arising from an exercise of stock options with cash used as the method of payment. The filing also lists recent 10b5-1 sales by Samira Shaikhly: 5,935 shares on 06/01/2026 and 11,798 shares on 05/26/2026.

Insights

Securities Counsel

Form 144 notice for option-derived shares and recent 10b5-1 dispositions.

This notice lists an intended sale of 8,428 shares on 06/12/2026

The excerpt names an exercise of stock options as the source and indicates cash as the payment method; recent automated 10b5-1 sales of 5,935 and 11,798 shares are recorded for Samira Shaikhly. The filing is a regulatory notice of proposed resale and does not itself effect the transactions.

Key Figures

Proposed sale: 8,428 shares 10b5-1 sale: 11,798 shares 10b5-1 sale: 5,935 shares +1 more

4 metrics

Proposed sale 8,428 shares sale dated 06/12/2026 from exercise of stock options

10b5-1 sale 11,798 shares sale by Samira Shaikhly on 05/26/2026

10b5-1 sale 5,935 shares sale by Samira Shaikhly on 06/01/2026

Proceeds listed (example row) $286,804.84 amount shown in the filing excerpt (associated table row)

Key Terms

Form 144, 10b5-1, exercise of stock options

3 terms

Form 144 regulatory

"Filer Information | 144: Filer 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 regulatory

"10b5-1 Sales for SAMIRA SHAIKHLY"

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.

exercise of stock options financial

"06/12/2026 | Exercise of Stock Options"

FAQ

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

What does the SEPN Form 144 disclose?

It discloses a proposed sale of 8,428 shares on 06/12/2026 from an exercise of stock options, and lists prior 10b5-1 sales by Samira Shaikhly.

Who is the reported seller in the Form 144 for SEPN?

The filing lists Morgan Stanley Smith Barney LLC Executive Financial Services as the broker-dealer handling the proposed sale of 8,428 shares on 06/12/2026.

What recent 10b5-1 sales are shown in this filing?

The excerpt records 10b5-1 sales by Samira Shaikhly: 11,798 shares sold on 05/26/2026 and 5,935 shares sold on 06/01/2026, with proceeds listed in the filing.

Was cash used for the transaction in the Form 144?

Yes; the sale entry tied to the 06/12/2026 exercise of stock options specifies Cash as the method of payment in the provided excerpt.

Does this Form 144 mean the shares have already been sold?

No; this filing is a notice of a proposed sale. The excerpt records intended sale dates and past 10b5-1 sales but does not itself confirm settlement or transfer.

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

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Accepted by SEC EDGAR 06/12/2026 - 04:42 PM 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	0002040363
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	Septerna, Inc.
SEC File Number	001-42382
Address of Issuer	250 East Grand Avenue South San Francisco CALIFORNIA 94080
Phone	650-338-3533
Name of Person for Whose Account the Securities are To Be Sold	SAMIRA SHAIKHLY
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	8428	286804.84	45075533	06/12/2026	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	06/12/2026	Exercise of Stock Options	Issuer			8428	06/12/2026	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 SAMIRA SHAIKHLY 250 East Grand Avenue South San Francisco CA 94080	Common	06/01/2026	5935	171682.78
10b5-1 Sales for SAMIRA SHAIKHLY 250 East Grand Avenue South San Francisco CA 94080	Common	05/26/2026	11798	354656.37

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	06/12/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	10/31/2025
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/ Samira Shaikhly
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)