Voya reports 0.2% stake in Tandem Diabetes Care

Voya Financial, Inc. filed an amended Schedule 13G reporting its beneficial ownership of common stock of Tandem Diabetes Care, Inc. Voya reports beneficial ownership of 149,088 shares of Tandem’s common stock, representing 0.2% of the outstanding class.

Rhea-AI Filing Summary

Voya Financial, Inc. filed an amended Schedule 13G reporting its beneficial ownership of common stock of Tandem Diabetes Care, Inc. Voya reports beneficial ownership of 149,088 shares of Tandem’s common stock, representing 0.2% of the outstanding class.

Voya states it has sole voting power and sole dispositive power over all 149,088 shares, with no shared voting or dispositive power. The filing notes that this ownership represents 5 percent or less of the class and is reported by Voya as the ultimate parent of certain wholly owned subsidiaries listed on an exhibit.

Key Figures

Shares beneficially owned: 149,088 shares Percent of class: 0.2% Sole voting power: 149,088 shares +3 more

6 metrics

Shares beneficially owned 149,088 shares Common stock of Tandem Diabetes Care reported by Voya Financial

Percent of class 0.2% Portion of Tandem Diabetes Care common stock class held by Voya Financial

Sole voting power 149,088 shares Shares over which Voya Financial has sole power to vote

Sole dispositive power 149,088 shares Shares over which Voya Financial has sole power to dispose

CUSIP 875372203 CUSIP for Tandem Diabetes Care common stock referenced in the filing

Signature date 08/06/2026 Date the Schedule 13G/A was signed by Voya’s SVP, Deputy General Counsel

Key Terms

beneficially own, Sole Voting Power, Sole Dispositive Power, Ownership of 5 percent or less of a class, +2 more

6 terms

beneficially own regulatory

"may be deemed to beneficially own the securities to which the applies"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

Sole Voting Power financial

"Sole Voting Power 149,088.00 6 | Shared Voting Power 0.00"

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.

Sole Dispositive Power financial

"Sole Dispositive Power 149,088.00 8 | Shared Dispositive Power 0.00"

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.

Ownership of 5 percent or less of a class regulatory

"Item 5. | Ownership of 5 Percent or Less of a Class."

parent holding company regulatory

"If a parent holding company has filed this schedule, pursuant to (ii)(G)"

Schedule 13G regulatory

"If a parent holding company has filed this schedule, pursuant to (ii)(G)"

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.

FAQ

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

What ownership stake in TNDM does Voya Financial report in this Schedule 13G/A?

Voya Financial reports beneficial ownership of 149,088 shares of Tandem Diabetes Care common stock, representing 0.2% of the class. The position is reported as being held with sole voting and dispositive power.

Does Voya Financial have sole or shared voting power over its TNDM shares?

Voya Financial reports sole voting power over 149,088 shares of Tandem Diabetes Care and no shared voting power. It likewise reports sole dispositive power over the same number of shares.

Is Voya Financial’s ownership in TNDM above or below 5 percent of the class?

Voya Financial’s reported ownership in Tandem Diabetes Care is 0.2% of the common stock, which is 5 percent or less of the class. This is reflected in the Ownership of 5 Percent or Less item.

Who is the reporting person on this Schedule 13G/A related to TNDM?

The reporting person is Voya Financial, Inc., a Delaware corporation. It files as the ultimate parent corporation of its wholly owned subsidiaries listed on Exhibit A that may be deemed to beneficially own the securities.

What class of TNDM securities is covered by Voya Financial’s Schedule 13G/A?

The filing covers common stock of Tandem Diabetes Care, with a par value of $0.001 per share and CUSIP number 875372203. Voya’s reported holdings and percentages relate specifically to this class.

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

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Available on EDGAR 08/06/2026 - 07:15 AM Accepted by SEC EDGAR 08/06/2026 - 07:15 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)

TANDEM DIABETES CARE INC

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

875372203

(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): 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 149,088.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 149,088.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

149,088.00

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)

0.2 %

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, 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 No.: 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: 149,088
(b)	Percent of class: 0.2%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 149,088
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 149,088
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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, Deputy General Counsel
Date:	08/06/2026