SEPN Rule 144: JAE KIM 94,339-Share Sale

SEPN Rule 144 notice: The filing lists proposed transactions in Common stock under an Employee Stock Purchase Plan and a Rule 144 notice dated 06/26/2026.

Rhea-AI Filing Summary

SEPN Rule 144 notice: The filing lists proposed transactions in Common stock under an Employee Stock Purchase Plan and a Rule 144 notice dated 06/26/2026. It shows a reported sale by JAE KIM of 94,339 shares on 06/22/2026 for $3,326,119.56. The excerpt also lists plan-related entries dated 10/31/2025 (1,198 shares) and 04/30/2026 (1,240 shares).

Insights

Securities Compliance Attorney

Rule 144 notice documents proposed resale of restricted shares by an insider.

Rule 144 notices record intended sales of restricted or control securities; the excerpt shows a completed sale by JAE KIM of 94,339 shares on 06/22/2026 with proceeds of $3,326,119.56. The filing also lists Employee Stock Purchase Plan entries dated 10/31/2025 and 04/30/2026.

These notices are administrative and do not themselves change outstanding share counts or corporate governance; subsequent SEC filings or broker reports will show settlement and any impact on beneficial ownership.

Key Figures

Shares sold: 94,339 shares Proceeds: $3,326,119.56 Filing date: 06/26/2026 +4 more

7 metrics

Shares sold 94,339 shares Sale dated 06/22/2026 by JAE KIM

Proceeds $3,326,119.56 Proceeds reported alongside 06/22/2026 sale

Filing date 06/26/2026 Date shown in filer/security header

ESPP entry 1,198 shares Employee Stock Purchase Plan entry dated 10/31/2025

ESPP entry 1,240 shares Employee Stock Purchase Plan entry dated 04/30/2026

Numeric field 89,242.99 Numeric value appearing in header area (exact label not provided)

Numeric field 45,075,533 Numeric value appearing in header area (exact label not provided)

Key Terms

Rule 144, Employee Stock Purchase Plan, Issuer, Proceeds

4 terms

Rule 144 regulatory

"Securities To Be Sold and filing header referencing resale procedures"

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.

Employee Stock Purchase Plan financial

"Lines listing plan entries dated 10/31/2025 and 04/30/2026"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Issuer regulatory

"Table column showing 'Issuer' as the selling/issuing party"

Proceeds financial

"Entry showing 3326119.56 associated with the 06/22/2026 sale"

FAQ

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

What does SEPN's Form 144 say about the June 2026 sale?

The Form 144 reports a sale by JAE KIM of 94,339 shares on 06/22/2026, with proceeds shown as $3,326,119.56. This form notifies the market of an intended or proposed resale under Rule 144.

Does the filing show shares issued under an Employee Stock Purchase Plan for SEPN?

Yes; the excerpt lists Employee Stock Purchase Plan entries dated 10/31/2025 for 1,198 shares and 04/30/2026 for 1,240 shares. These lines appear as issuer plan-related entries in the table.

Is the sale by JAE KIM a completed transaction or just a notice?

The filing records a sale dated 06/22/2026 for 94,339 shares with proceeds of $3,326,119.56. Form 144 serves as a resale notice; settlement confirmation and post-transaction ownership will appear in subsequent filings.

What does the date 06/26/2026 represent in the excerpt?

The excerpt includes 06/26/2026 in the filer/security header area, indicating the filing or reporting date on the cover lines. It does not by itself change the transaction details dated within the table.

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

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Accepted by SEC EDGAR 06/26/2026 - 04:02 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	0001819159
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	JAE KIM
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	2438	89242.99	45075533	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	10/31/2025	Employee Stock Purchase Plan	Issuer			1198	10/31/2025	Cash
Common	04/30/2026	Employee Stock Purchase Plan	Issuer			1240	04/30/2026	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
JAE KIM 250 East Grand Avenue, South San Francisco, CA 94080	Common	06/22/2026	94339	3326119.56

144: Remarks and Signature

Remarks
Date of Notice	06/26/2026
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/ Jae Kim
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)