Capital International Investors reports 8.0% stake in Klaviyo

Capital International Investors amends its Schedule 13G to report beneficial ownership in Klaviyo, Inc. The filing states CII beneficially owns 11,703,859 shares, representing 8.0% of 145,497,436 shares believed to be outstanding.

Rhea-AI Filing Summary

Capital International Investors amends its Schedule 13G to report beneficial ownership in Klaviyo, Inc. The filing states CII beneficially owns 11,703,859 shares, representing 8.0% of 145,497,436 shares believed to be outstanding. The filing lists sole voting power and sole dispositive power over those shares.

Insights

Institutional Ownership Analyst

Large passive holder reports an 8.0% stake in Klaviyo.

The amendment shows Capital International Investors controls 11,703,859 shares with sole voting and dispositive power. The filing is a standard ownership disclosure under Schedule 13G/A and does not describe planned transactions.

Institutional ownership at this scale can influence liquidity and governance dynamics; subsequent filings would show changes if CII adjusts its position.

Corporate Governance Specialist

Filing clarifies voting and disposition authority for a significant holder.

The statement that CII has "sole voting power" and "sole dispositive power" over 11,703,859 shares is a clear attribution of control for proxy and voting contexts. The filing attributes ownership to CII and its affiliated investment management entities.

Any governance impact depends on whether CII engages with management or votes its shares; the amendment itself contains no engagement commitments.

Key Figures

Shares beneficially owned: 11,703,859 shares Percent of class: 8.0% Shares believed outstanding: 145,497,436 shares

3 metrics

Shares beneficially owned 11,703,859 shares reported by Capital International Investors in Schedule 13G/A

Percent of class 8.0% of 145,497,436 shares believed to be outstanding

Shares believed outstanding 145,497,436 shares figure used to calculate the 8.0% ownership

Key Terms

Schedule 13G/A, Beneficial ownership, Sole voting power

3 terms

Schedule 13G/A regulatory

"Amendment No. 1; Capital International Investors amends its Schedule 13G"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficial ownership financial

"CII is deemed to be the beneficial owner of 11,703,859 shares"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Sole voting power governance

"Sole Voting Power 11,703,859.00; Sole power to vote or to direct the vote: 11,703,859"

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.

FAQ

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

What stake in Klaviyo (KVYO) does Capital International Investors report?

Capital International Investors reports beneficial ownership of 11,703,859 shares, equal to 8.0% of 145,497,436 shares believed to be outstanding.

Does Capital International Investors have voting control over these Klaviyo shares?

Yes. The filing states CII has sole voting power and sole dispositive power over 11,703,859 shares, per the Schedule 13G/A amendment.

Is this Schedule 13G/A amendment an indication of a planned sale or purchase?

No. The amendment discloses beneficial ownership and voting/dispositive power only; it does not describe any planned transactions or trades.

Who signed the filing on behalf of Capital International Investors?

The filing is signed by Aaron Espin, Senior Vice President, and dated 05/13/2026 on the Schedule 13G/A amendment.

How is the reported 8.0% ownership calculated in the filing?

The filing states CII's 11,703,859 shares represent 8.0% of the 145,497,436 shares believed to be outstanding, as presented in the amendment.

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

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Accepted by SEC EDGAR 05/14/2026 - 12:52 PM EDT 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)

Klaviyo, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

49845K101

(CUSIP Number)

03/31/2026

(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): 49845K101

1

Names of Reporting Persons

Capital International Investors

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 11,703,859.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 11,703,859.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

11,703,859.00

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)

8.0 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Klaviyo, Inc.
(b)	Address of issuer's principal executive offices: 125 Summer Street, Floor 6, Boston, MA 02110
Item 2.
(a)	Name of person filing: Capital International Investors
(b)	Address or principal business office or, if none, residence: 333 South Hope Street, 55th Fl, Los Angeles, CA 90071
(c)	Citizenship: N/A
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 49845K101
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: 11,703,859 ** **Capital International Investors ("CII") is a division of Capital Research and Management Company ("CRMC"), as well as its investment management subsidiaries and affiliates Capital Bank and Trust Company, Capital International, Inc., Capital International Limited, Capital International Sarl, Capital International K.K., Capital Group Private Client Services, Inc., and Capital Group Investment Management Private Limited (together with CRMC, the "investment management entities"). CII's divisions of each of the investment management entities collectively provide investment management services under the name "Capital International Investors." CII is deemed to be the beneficial owner of 11,703,859 shares or 8.0% of the 145,497,436 shares believed to be outstanding.
(b)	Percent of class: 8.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 11,703,859
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 11,703,859
	(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:

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.

Capital International Investors

Signature:	Aaron Espin
Name/Title:	Senior Vice President
Date:	05/13/2026