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

May 19, 2016

Date of Report (Date of earliest event reported)

Cidara Therapeutics, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (858) 752-6170

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

On May 19, 2016, Cidara Therapeutics, Inc. (“Cidara”) entered into a Controlled Equity Offering^SM Sales Agreement (the “Sales Agreement”) with Cantor Fitzgerald & Co., as sales agent (“Cantor Fitzgerald”), pursuant to which Cidara may offer and sell, from time to time, through Cantor Fitzgerald, shares of Cidara common stock, par value $0.0001 per share, having an aggregate offering price of up to $35.0 million.

Cidara is not obligated to sell any shares under the Sales Agreement. Subject to the terms and conditions of the Sales Agreement, Cantor Fitzgerald will use commercially reasonable efforts consistent with its normal trading and sales practices, applicable state and federal law, rules and regulations and the rules of the NASDAQ Global Market to sell shares from time to time based upon Cidara’s instructions, including any price, time or size limits specified by Cidara. Under the Sales Agreement, Cantor Fitzgerald may sell shares by any method deemed to be an “at-the-market” offering as defined in Rule 415 under the U.S. Securities Act of 1933, as amended, or any other method permitted by law, including in privately negotiated transactions. Cantor Fitzgerald’s obligations to sell shares under the Sales Agreement are subject to satisfaction of certain conditions, including the effectiveness of the registration statement on Form S-3 filed by Cidara with the U.S. Securities and Exchange Commission (the “SEC”) on May 19, 2016. Cidara will pay Cantor Fitzgerald a commission of 3.0% of the aggregate gross proceeds from each sale of shares and has agreed to provide Cantor Fitzgerald with customary indemnification and contribution rights. Cidara has also agreed to reimburse Cantor Fitzgerald for legal fees and disbursements, not to exceed $50,000 in the aggregate, in connection with entering into the Sales Agreement.

The Sales Agreement may be terminated by Cantor Fitzgerald or Cidara at any time upon notice to the other party, or by Cantor Fitzgerald at any time in certain circumstances, including the occurrence of a material and adverse change in Cidara’s business or financial condition that makes it impractical or inadvisable to market the shares or to enforce contracts for the sale of the shares.

The foregoing summary of the Sales Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Sales Agreement, a copy of which Cidara filed with its registration statement on Form S-3 on May 19, 2016.

Shares sold under the Sales Agreement will be issued pursuant to Cidara’s registration statement on Form S-3 and the sales agreement prospectus that forms a part of such registration statement, following such time as the registration statement is declared effective by the SEC. This Current Report on Form 8-K shall not constitute an offer to sell or the solicitation of an offer to buy any shares under the Sales Agreement, nor shall there be any sale of such shares in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

Item 9.01. Financial Statements and Exhibits

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.

Exhibit Index