Voya Financial reports 6.3% stake in Tandem Diabetes Care

Voya Financial, Inc. reports beneficial ownership of Tandem Diabetes Care common stock.

Rhea-AI Filing Summary

Voya Financial, Inc. reports beneficial ownership of Tandem Diabetes Care common stock. Voya states it beneficially owns 4,343,683 shares, representing 6.3% of the class, with 2,325,854 shares of sole voting power and sole dispositive power over all 4,343,683 shares. The report is filed by the ultimate parent on behalf of wholly owned subsidiaries and is signed by Voya's SVP, Chief Compliance and Deputy General Counsel.

Insights

Institutional Ownership Analyst

Large passive holding disclosed: Voya holds 6.3% of Tandem Diabetes Care.

Voya Financial, as ultimate parent, reports beneficial ownership of 4,343,683 shares and sole dispositive power over that position. The filing follows Schedule 13G presentation norms for passive or investment-manager holdings and lists subsidiaries on Exhibit A.

Ownership size at 6.3% can be relevant for monitoring voting outcomes and potential reporting triggers; further detail on trading intent or investment mandate is not provided in the excerpt.

Key Figures

Beneficial ownership: 4,343,683 shares Percent of class: 6.3% Sole voting power: 2,325,854 shares +1 more

4 metrics

Beneficial ownership 4,343,683 shares Amount beneficially owned reported on Schedule 13G

Percent of class 6.3% Percent of class beneficially owned

Sole voting power 2,325,854 shares Shares for which Voya has sole power to vote

Sole dispositive power 4,343,683 shares Shares for which Voya has sole power to dispose

Key Terms

Schedule 13G, Beneficial ownership, Sole dispositive power, Ultimate parent

4 terms

Schedule 13G regulatory

"Item 1. | (a) | Name of issuer: TANDEM DIABETES CARE INC"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Beneficial ownership financial

"Item 4. | Ownership (a) | Amount beneficially owned: 4,343,683"

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 dispositive power regulatory

"Item 4. | (iii) Sole power to dispose or to direct the disposition of: 4,343,683"

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.

Ultimate parent other

"This is filed by Voya Financial, Inc., the ultimate corporate parent"

FAQ

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

What stake does Voya Financial report in Tandem Diabetes Care (TNDM)?

Voya reports beneficial ownership of 4,343,683 shares, equal to 6.3% of the outstanding class. The filing lists sole voting power for 2,325,854 shares and sole dispositive power over all 4,343,683 shares.

Who filed the Schedule 13G for TNDM on behalf of Voya Financial?

The Schedule 13G was filed by Voya Financial, Inc. as the ultimate parent of the reporting subsidiaries. The filing is signed by Mark Sides, SVP, Chief Compliance and Deputy General Counsel.

Does the filing indicate whether Voya will vote or sell its TNDM shares?

The filing shows Voya has sole voting and dispositive power for portions of the position, but it does not state any intent to buy, sell, or change voting plans. Trading intent or plan details are not disclosed in the provided excerpt.

Are the shares held directly by Voya or by subsidiaries?

Voya states it is filing as the ultimate parent of wholly owned subsidiaries listed on Exhibit A. The filing attributes beneficial ownership to Voya on behalf of those subsidiaries rather than specifying individual subsidiary holdings.

What percent ownership requires Schedule 13G disclosure?

A Schedule 13G is used when a person or entity reports beneficial ownership above certain thresholds; here Voya reports 6.3% beneficial ownership of the class. The filing type and threshold depend on the filer’s status and intent under SEC rules.

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

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Accepted by SEC EDGAR 05/05/2026 - 10:48 AM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

TANDEM DIABETES CARE INC

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

875372203

(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): 875372203

1

Names of Reporting Persons

Voya Financial, 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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,325,854.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 4,343,683.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,343,683.00

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)

6.3 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: TANDEM DIABETES CARE INC
(b)	Address of issuer's principal executive offices: 12400 HIGH BLUFF DRIVE, San Diego, CALIFORNIA, 92130.
Item 2.
(a)	Name of person filing: Voya Financial, Inc.
(b)	Address or principal business office or, if none, residence: 200 Park Avenue New York, NY 10166
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock, par value $0.001 per share
(e)	CUSIP Number(s): 875372203
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: 4,343,683
(b)	Percent of class: 6.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2,325,854
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 4,343,683
	(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.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. This Schedule 13G is filed by Voya Financial, Inc., the ultimate corporate parent of the subsidiary entities listed on Exhibit A. Each such entity may be deemed to beneficially own the securities to which the Schedule 13G applies.
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. Voya Financial, Inc. is filing this Schedule 13G pursuant to Rule 13d-1(b)(1)(ii)(G) as the ultimate parent corporation of its wholly owned subsidiaries listed on Exhibit A hereto.
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.

Voya Financial, Inc.

Signature:	/s/ Mark Sides
Name/Title:	SVP, Chief Compliance and Deputy General Counsel
Date:	05/05/2026