Whetstone reports 9.2% Sera Prognostics (SERA) ownership position

Rhea-AI Filing Summary

Sera Prognostics, Inc. received an updated large shareholder report showing that Whetstone Capital Advisors, LLC and David Atterbury together beneficially own 3,459,713 shares of its Class A common stock, representing 9.2% of the class. The filing states that the reporting persons share voting and dispositive power over these shares. They also certify that the securities were not acquired and are not held for the purpose of changing or influencing control of Sera Prognostics, but instead are reported on a passive basis under Schedule 13G/A.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Sera Prognostics, Inc.

(Name of Issuer)

Class A Common Stock, par value $0.0001 per share

(Title of Class of Securities)

81749D107

(CUSIP Number)

12/31/2025

(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)

SCHEDULE 13G

CUSIP No. 81749D107

1

Names of Reporting Persons

Whetstone Capital Advisors, LLC

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

KANSAS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power
6	Shared Voting Power 3,459,713.00
7	Sole Dispositive Power
8	Shared Dispositive Power 3,459,713.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,459,713.00

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)

9.2 %

12

Type of Reporting Person (See Instructions)

IA, OO

SCHEDULE 13G

CUSIP No. 81749D107

1

Names of Reporting Persons

David Atterbury

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
6	Shared Voting Power 3,459,713.00
7	Sole Dispositive Power
8	Shared Dispositive Power 3,459,713.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,459,713.00

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)

9.2 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Sera Prognostics, Inc.
(b)	Address of issuer's principal executive offices: 2749 East Parleys Way, Suite 200, Salt Lake City, Utah 84109
Item 2.
(a)	Name of person filing: Whetstone Capital Advisors, LLC ("WCA") and Mr. David Atterbury (collectively the "Reporting Persons").
(b)	Address or principal business office or, if none, residence: 2001 Shawnee Mission Parkway, Shawnee Mission, Kansas 66205
(c)	Citizenship: United States of America
(d)	Title of class of securities: Class A Common Stock, par value $0.0001 per share
(e)	CUSIP No.: 81749D107
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: 3,459,713
(b)	Percent of class: 9.2%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote:
	(ii) Shared power to vote or to direct the vote: 3,459,713
	(iii) Sole power to dispose or to direct the disposition of:
	(iv) Shared power to dispose or to direct the disposition of: 3,459,713
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:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

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.

Whetstone Capital Advisors, LLC

Signature:	/s/ David Atterbury
Name/Title:	Manager
Date:	01/16/2026

David Atterbury

Signature:	/s/ David Atterbury
Name/Title:	David Atterbury
Date:	01/16/2026

FAQ

What stake in Sera Prognostics (SERA) is reported in this Schedule 13G/A?

The Schedule 13G/A reports that Whetstone Capital Advisors, LLC and David Atterbury beneficially own 3,459,713 shares of Sera Prognostics Class A common stock, representing 9.2% of the outstanding class.

Who are the reporting persons in the Sera Prognostics (SERA) Schedule 13G/A amendment?

The reporting persons are Whetstone Capital Advisors, LLC (WCA) and David Atterbury, who are collectively identified as the reporting persons for this ownership statement.

What voting and dispositive power do the reporting persons have over Sera Prognostics shares?

The filing states that the reporting persons have shared power to vote and to dispose of 3,459,713 Sera Prognostics Class A common shares. No sole voting or dispositive power is reported.

Does this Sera Prognostics Schedule 13G/A indicate an intent to influence control of the company?

No. The certification states that the securities were not acquired and are not held for the purpose or effect of changing or influencing the control of Sera Prognostics, and are not held in connection with any such transaction, other than activities related to a nomination under Rule 14a-11.

What type of filing is this for Sera Prognostics (SERA)?

This is an Amendment No. 1 to Schedule 13G, which is a beneficial ownership report for holders of more than 5% of a class of registered equity securities, here covering Sera Prognostics Class A common stock.

When is the ownership position in Sera Prognostics measured in this Schedule 13G/A?

The date of the event requiring the filing is listed as December 31, 2025, which is the reference date for the reported 3,459,713 shares and 9.2% ownership.