UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 14, 2017

Tandem Diabetes Care, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (858) 366-6900

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

                                                                                                                                             Emerging growth company   ☒                                         

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.   ☒    

Item 3.01         Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On June 14, 2017, Tandem Diabetes Care, Inc. (the “Company”) received a letter from The Nasdaq Stock Market LLC (“Nasdaq”) indicating that Nasdaq has determined that the Company no longer meets the minimum bid price requirement of Nasdaq Listing Rule 5450(a)(1), as the minimum closing bid price for the Company’s common stock was less than $1.00 for the previous 30 consecutive business days.

The Notice has no immediate effect on the listing of the Company’s common stock on The Nasdaq Global Market. Under Nasdaq Listing Rule 5810(c)(3)(A), the Company has a 180 calendar day grace period to regain compliance by meeting the continued listing standard. The continued listing standard would be met if the Company’s common stock has a minimum closing bid price of at least $1.00 per share for a minimum of 10 consecutive business days during the 180 calendar day grace period.

The Company is monitoring the closing bid price of its common stock and will consider options available to potentially achieve compliance with the Nasdaq Listing Rules.

Forward-Looking Statements

This Current Report on Form 8-K contains “forward-looking statements” that concern matters that involve risks and uncertainties that could cause actual results to differ materially from those anticipated or projected in the forward-looking statements. These forward-looking statements include statements regarding the Company’s plans and ability to regain compliance with Nasdaq’s continued listing requirements. The Company’s actual results may differ materially from those indicated in these forward-looking statements due to numerous risks and uncertainties, including the Company’s ability to coordinate and implement its strategy to achieve compliance and continued strategy to seek compliance. Other risks and uncertainties are identified in the Company’s most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q, and other documents that the Company files with the Securities and Exchange Commission. Investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release. The Company undertakes no obligation to update or review any forward-looking statement in this Form 8-K because of new information, future events or other factors.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.