Aberdeen Group Files 13G for 2.23M SERA Shares, 6% Ownership

Rhea-AI Filing Summary

Aberdeen Group plc and its U.S. affiliate abrdn Inc. have filed a Schedule 13G disclosing a passive ownership stake in Sera Prognostics (SERA).

• Shares owned: 2,227,367 Class A common shares.
• Ownership percentage: 6.07% of the outstanding class as of 30 Jun 2025.
• Voting & dispositive power: 0 shares held with sole power; all 2,227,367 shares held with shared voting and dispositive power by both reporting entities.
• Reporting parties: Aberdeen Group plc (UK parent, classified as a Holding Company – “HC”) and abrdn Inc. (US subsidiary, classified as Corporation & Investment Adviser – “CO, IA”).
• Intent: Certification states the position is held in the ordinary course of business and is not intended to influence or control the issuer.
• Structure: Aberdeen Group plc → abrdn Holdings Ltd. → abrdn Inc.; the U.S. adviser holds the shares for underlying clients.

The filing indicates that a sizable institutional investor has surpassed the 5 % threshold, triggering disclosure under Rule 13d-1(b). No changes to company control or strategic direction are signaled.

Positive

• Institutional ownership exceeds 6 %, indicating increased professional investor interest in SERA.
• Position classified as passive, reducing risk of disruptive activist activity while still adding shareholder support.

Negative

• None.

Insights

Portfolio Manager

TL;DR: abrdn reveals 6 % passive stake, adding institutional support without control ambitions; market impact likely modest but positive sentiment.

The 13G shows an international asset manager allocating client capital to SERA, a small-cap diagnostics name. A 6.07 % position is meaningful for liquidity yet remains below 10 %, so no activist overtones. Shared rather than sole voting/dispositive power confirms the stake is aggregated across managed accounts. For existing shareholders the disclosure improves the free-float quality, potentially lowering volatility and enhancing analyst attention. However, as a passive filing, it carries no direct catalyst for operational change or takeover speculation. Impact is therefore mildly constructive but not transformational.

Corporate Governance Analyst

TL;DR: Filing signals compliance and transparency; no governance pressure expected.

Because Aberdeen/abrdn filed on Form 13G rather than 13D, they certify no intent to influence control. The filing complies with §240.13d-1(b) and includes clear breakdown of voting power, supporting SERA’s governance stability. Investors should not anticipate board nominations or policy proposals from this holder. The presence of a reputable UK-based institution may nonetheless enhance governance credibility and facilitates future capital raises by diversifying the shareholder register.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

SERA PROGNOSTICS, INC.

(Name of Issuer)

Class A Common Stock $0.0001 par value per share

(Title of Class of Securities)

81749D107

(CUSIP Number)

06/30/2025

(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

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 2,227,367.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,227,367.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,227,367.00

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)

6.07 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP No. 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 2,227,367.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,227,367.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,227,367.00

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)

6.07 %

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: 2,227,367
(b)	Percent of class: 6.07 %
(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 - 2,227,367 abrdn Inc. - 2,227,367
	(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 - 2,227,367 abrdn Inc. - 2,227,367
Item 5.	Ownership of 5 Percent or Less of a Class.
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:	C. Cole
Name/Title:	Chris Cole/ Senior Major Shareholding Reporting Analyst
Date:	08/05/2025

abrdn Inc.

Signature:	C.Cole
Name/Title:	Chris Cole/ Senior Major Shareholding Reporting Analyst
Date:	08/05/2025

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.

FAQ

How many SERA shares does abrdn Inc. own?

The Schedule 13G lists 2,227,367 Class A shares held with shared voting and dispositive power.

What percentage of Sera Prognostics does Aberdeen Group plc control?

Aberdeen Group plc and affiliates report 6.07 % of the outstanding Class A common stock.

Is the abrdn stake in SERA activist or passive?

Filed on Schedule 13G, the stake is passive; the filers certify no intent to influence control.

When was the ownership level triggering disclosure reached?

The event date requiring this filing is 30 June 2025.

What are the voting rights associated with the disclosed SERA shares?

Both entities have shared voting and dispositive power over all 2,227,367 shares; no sole power is held.