Seaport Therapeutics (SPTX): Daphne Zohar discloses 5.23M-share, 9.1% beneficial stake

Rhea-AI Filing Summary

Daphne Zohar reports beneficial ownership of Voting Common Stock of Seaport Therapeutics, Inc. as of June 30, 2026. She is deemed to beneficially own 5,225,497 shares of common stock, based on 53,530,550 shares outstanding, representing 9.1% of the class.

The position includes 1,194,001 shares held of record and 4,031,496 shares subject to stock options exercisable within 60 days of June 30, 2026. She has sole voting and sole dispositive power over all 5,225,497 shares, with no shared voting or dispositive power reported.

Key Figures

Beneficially owned shares: 5,225,497 shares Percent of class: 9.1% Shares outstanding: 53,530,550 shares +4 more

7 metrics

Beneficially owned shares 5,225,497 shares Voting Common Stock beneficially owned by Daphne Zohar as of June 30, 2026

Percent of class 9.1% Percentage of Seaport Therapeutics Voting Common Stock owned by Daphne Zohar

Shares outstanding 53,530,550 shares Shares of Voting Common Stock outstanding as of June 30, 2026

Shares held of record 1,194,001 shares Voting Common Stock held of record by Daphne Zohar

Exercisable stock options 4,031,496 shares Shares subject to stock options exercisable within 60 days of June 30, 2026

Sole voting power 5,225,497 shares Shares over which she has sole power to vote or direct the vote

Sole dispositive power 5,225,497 shares Shares over which she has sole power to dispose or direct the disposition

Key Terms

beneficial owner, sole voting power, sole dispositive power, stock options exercisable within 60 days, +1 more

5 terms

beneficial owner financial

"The Reporting Person is deemed to be the beneficial owner of 5,225,497 shares"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power financial

"Sole Voting Power 5,225,497.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole Dispositive Power 5,225,497.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

stock options exercisable within 60 days financial

"4,031,496 shares of Common Stock subject to stock options exercisable within 60 days"

Voting Common Stock financial

"Title of class of securities: Voting Common Stock, $0.0001 par value per share"

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

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Available on EDGAR 08/05/2026 - 08:06 AM Accepted by SEC EDGAR 08/05/2026 - 08:06 AM Learn about SEC filing dates

FAQ

How many Seaport Therapeutics (SPTX) shares does Daphne Zohar beneficially own?

Daphne Zohar is deemed to beneficially own 5,225,497 shares of Seaport Therapeutics Voting Common Stock, based on issuer information as of June 30, 2026, including both held shares and exercisable stock options.

What percentage of Seaport Therapeutics (SPTX) does Daphne Zohar own?

Daphne Zohar’s reported beneficial ownership represents 9.1% of Seaport Therapeutics’ Voting Common Stock, calculated using 53,530,550 shares outstanding as of June 30, 2026 as provided by the company.

How is Daphne Zohar’s Seaport Therapeutics (SPTX) ownership structured?

Her 5,225,497 beneficially owned shares consist of 1,194,001 shares of Voting Common Stock held of record and 4,031,496 shares underlying stock options that are exercisable within 60 days of June 30, 2026.

What voting power does Daphne Zohar have over Seaport Therapeutics (SPTX) shares?

She reports sole voting power over 5,225,497 Seaport Therapeutics shares and no shared voting power, meaning she alone can vote or direct the vote for all of her reported beneficial holdings.

What dispositive power does Daphne Zohar report over Seaport Therapeutics (SPTX) stock?

She has sole dispositive power over 5,225,497 shares of Seaport Therapeutics Voting Common Stock and no shared dispositive power, giving her individual authority to dispose of or direct the disposition of these shares.

What class of Seaport Therapeutics (SPTX) securities is reported in this Schedule 13G?

The filing covers Seaport Therapeutics’ Voting Common Stock, with a par value of $0.0001 per share, identified by CUSIP 81221K108, as the security class for which beneficial ownership is being reported.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Seaport Therapeutics, Inc.

(Name of Issuer)

Voting Common Stock, $0.0001 par value per share

(Title of Class of Securities)

81221K108

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 81221K108

1

Names of Reporting Persons

Zohar Daphne

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 5,225,497.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,225,497.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,225,497.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

9.1 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Seaport Therapeutics, Inc.
(b)	Address of issuer's principal executive offices: 101 Seaport Blvd., Floor 12, Boston, MA 02210
Item 2.
(a)	Name of person filing: This statement is filed on behalf of Daphne Zohar (the "Reporting Person").
(b)	Address or principal business office or, if none, residence: The address of the principal business office of the Reporting Person is 101 Seaport Blvd., Floor 12, Boston, MA 02210.
(c)	Citizenship: The Reporting Person is a citizen of the United States.
(d)	Title of class of securities: Voting Common Stock, $0.0001 par value per share
(e)	CUSIP Number(s): 81221K108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: The ownership information below represents beneficial ownership of Voting Common Stock, par value $0.0001 per share ("Common Stock") of the Issuer as of June 30, 2026, based upon 53,530,550 shares of Common Stock outstanding as of June 30, 2026, as provided by the Issuer. The Reporting Person is deemed to be the beneficial owner of 5,225,497 shares of Common Stock, consisting of (i) 1,194,001 shares of Common Stock held of record by the Reporting Person and (ii) 4,031,496 shares of Common Stock subject to stock options exercisable within 60 days of June 30, 2026 by the Reporting Person.
(b)	Percent of class: 9.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 5,225,497
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 5,225,497
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Zohar Daphne

Signature:	/s/ Daphne Zohar
Name/Title:	Daphne Zohar
Date:	08/05/2026