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 earliest event reported: May 16, 2017

NovaBay Pharmaceuticals, Inc.

(Exact Name of Registrant as Specified in Charter)

2000 Powell Street, Suite 1150, Emeryville, CA               94608

(Address of Principal Executive Offices)                             (Zip Code)

(510) 899-8800

(Registrant’s telephone number, including area code)

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 (see General Instruction A.2. below):

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 May 16, 2017, NovaBay Pharmaceuticals, Inc. (the “Company”) was notified by the NYSE MKT that the Company is not in compliance with Section 1003(a)(iii) of the NYSE MKT Company Guide (requiring stockholders’ equity of $6.0 million or more if it has reported losses from continuing operations and/or net losses in its five most recent fiscal years). Therefore, the Company has become subject to the procedures and requirements of Section 1009 of the NYSE MKT Company Guide and must submit a plan of compliance by June 15, 2017 addressing how it intends to regain compliance with Section 1003(a)(iii) of the NYSE MKT Company Guide. As of March 31, 2017, the Company had stockholders’ equity of $4.4 million.

The Company intends to submit a plan to regain compliance with NYSE MKT listing standards. If the Company does not regain compliance with those standards, or does not make progress consistent with the plan, the NYSE MKT staff may commence delisting proceedings. The Company’s common stock will continue to be listed on the NYSE MKT during the plan period.

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.

Dated: May 19, 2017