abrdn reports 7.21% stake in Sera Prognostics

Aberdeen Group plc and its subsidiary abrdn Inc. report beneficial ownership of 2,753,525 shares of Sera Prognostics, Inc. Class A common stock, representing 7.21% of that class as of June 30, 2026.

Rhea-AI Filing Summary

Aberdeen Group plc and its subsidiary abrdn Inc. report beneficial ownership of 2,753,525 shares of Sera Prognostics, Inc. Class A common stock, representing 7.21% of that class as of June 30, 2026.

Both entities have shared voting and dispositive power over all reported shares, with no sole voting or dispositive power. abrdn Inc. holds the position on behalf of underlying clients through a parent holding company structure involving Aberdeen Group plc and abrdn Holdings Limited.

Key Figures

Shares beneficially owned: 2,753,525 shares Percent of class: 7.21 % Shared voting power: 2,753,525 shares +3 more

6 metrics

Shares beneficially owned 2,753,525 shares Class A common stock beneficially owned by Aberdeen Group plc and abrdn Inc.

Percent of class 7.21 % Ownership percentage of Sera Prognostics Class A common stock

Shared voting power 2,753,525 shares Shares over which Aberdeen Group plc and abrdn Inc. share voting power

Shared dispositive power 2,753,525 shares Shares over which Aberdeen Group plc and abrdn Inc. share dispositive power

Sole voting power 0 shares Shares over which Aberdeen Group plc and abrdn Inc. have sole voting power

Event date 06/30/2026 Date as of which ownership in Sera Prognostics is reported

Key Terms

beneficially owned, shared voting power, shared dispositive power, parent holding company

4 terms

beneficially owned financial

"Amount beneficially owned: 2,753,525"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"Shared Voting Power 2,753,525.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 2,753,525.00"

parent holding company financial

"Aberdeen Group plc is the parent company."

FAQ

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

What percentage of Sera Prognostics (SERA) does abrdn report owning?

abrdn and its parent report 7.21% beneficial ownership of Sera Prognostics Class A common stock. This stake reflects holdings managed on behalf of underlying clients with shared voting and dispositive power over the reported shares.

How many Sera Prognostics (SERA) shares are beneficially owned by abrdn?

Aberdeen Group plc and abrdn Inc. beneficially own 2,753,525 Sera Prognostics Class A shares. These shares are held with shared voting and shared dispositive power, and represent the firms’ reported position as of June 30, 2026.

Who filed the Schedule 13G/A related to Sera Prognostics (SERA)?

The filing was made by Aberdeen Group plc and abrdn Inc.. Aberdeen Group plc is the parent company, with abrdn Holdings Limited as an intermediate holding company above abrdn Inc., which manages the reportable Sera shareholdings.

Does abrdn have sole or shared voting power over its SERA shares?

abrdn and its parent report 0 shares with sole voting power and 2,753,525 shares with shared voting power. They also report the same number with shared dispositive power and no sole dispositive power over Sera Prognostics shares.

As of what date is abrdn’s Sera Prognostics (SERA) ownership reported?

The ownership information is reported as of June 30, 2026. This date anchors the disclosed 2,753,525 beneficially owned shares and the 7.21% ownership percentage in Sera Prognostics’ Class A common stock.

Through which entities does Aberdeen Group hold its Sera Prognostics (SERA) position?

The position is held through Aberdeen Group plc, intermediate holding company abrdn Holdings Limited, and abrdn Inc.. abrdn Inc. beneficially owns the shares on behalf of underlying clients within this parent holding company structure.

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

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Accepted by SEC EDGAR 07/15/2026 - 10:27 AM Learn about SEC filing dates

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 $0.0001 par value per share

(Title of Class of Securities)

81749D107

(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): 81749D107

1

Names of Reporting Persons

Aberdeen Group plc

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 KINGDOM

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,753,525.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,753,525.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,753,525.00

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)

7.21 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 81749D107

1

Names of Reporting Persons

abrdn Inc.

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 0.00
6	Shared Voting Power 2,753,525.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,753,525.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,753,525.00

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)

7.21 %

12

Type of Reporting Person (See Instructions)

CO, IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: SERA PROGNOSTICS, INC.
(b)	Address of issuer's principal executive offices: 2749 E. PARLEYS WAY, SUITE 200, SALT LAKE CITY, UTAH 84109
Item 2.
(a)	Name of person filing: Aberdeen Group plc abrdn Inc.
(b)	Address or principal business office or, if none, residence: Aberdeen Group plc 1 George Street Edinburgh, United Kingdom EH2 2LL abrdn Inc. 1900 Market Street Suite 200. Philadelphia, PA 19103
(c)	Citizenship: Aberdeen Group plc - UNITED KINGDOM abrdn Inc. - UNITED STATES
(d)	Title of class of securities: Class A Common Stock $0.0001 par value 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: 2,753,525
(b)	Percent of class: 7.21 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Aberdeen Group plc - 0 abrdn Inc. - 0
	(ii) Shared power to vote or to direct the vote: Aberdeen Group plc - 2,753,525 abrdn Inc. - 2,753,525
	(iii) Sole power to dispose or to direct the disposition of: Aberdeen Group plc - 0 abrdn Inc. - 0
	(iv) Shared power to dispose or to direct the disposition of: Aberdeen Group plc - 2,753,525 abrdn Inc. - 2,753,525
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.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit
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 acquired and are held in the ordinary course of business and 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.

Aberdeen Group plc

Signature:	Cara Bird
Name/Title:	Cara Bird/Major Shareholding Reporting Analyst
Date:	07/15/2026

abrdn Inc.

Signature:	Cara Bird
Name/Title:	Cara Bird/Major Shareholding Reporting Analyst
Date:	07/15/2026

Exhibit Information

Aberdeen Group plc abrdn Holdings Limited abrdn Inc. Aberdeen Group plc is the parent company. abrdn Holdings Limited is the intermediate holding company for abrdn Inc. abrdn Inc. beneficially owns on behalf of our underlying clients 5% or greater of the outstanding shares of the security class being reported on this Schedule 13G.