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 5, 2018

Registrant’s telephone number, including area code: (617) 963-0100

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 [X]

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. [X]

On June 5, 2018, the Board of Directors (the “Board”) of Corbus Pharmaceuticals Holdings, Inc. (the “Company”), upon the recommendation of the Nominating and Corporate Governance Committee of the Board, appointed John K. Jenkins, MD age 60, to serve as a member of the Board. Dr. Jenkins will hold this position until the next annual meeting of the Company’s shareholders or until his successor is elected and qualified, subject to his earlier resignation or removal.

Dr. Jenkins has served as Principal, Drug and Biological Products at Greenleaf Health, a strategic, U.S. Food and Drug Administration (“FDA”)-focused regulatory consulting firm helping companies developing new drugs and seeking FDA approval, since February 2017. Previously, Dr. Jenkins worked in various positions of increasing responsibility at FDA from May 1992 until his retirement in January 2017. Dr. Jenkins began his FDA career in 1992, where he was a medical officer in the Division of Oncology and Pulmonary Drug Products. He subsequently served as Pulmonary Medical Group Leader and Acting Division Director before being appointed as Director of the Division of Pulmonary Drug Products in 1995. He became the Director of the Office of Drug Evaluation II in 1999 and remained in that position until he was appointed Director of the Office of New Drugs in 2002.

Dr. Jenkins will participate in the Company’s standard non-employee director compensation plan, including an initial option grant to purchase 68,000 shares of the Company’s common stock upon joining the Board, an annual cash retainer fee of $35,000 (pro-rated for the current year), and an annual stock option grant to purchase shares of the Company’s common stock.

There are no transactions between Dr. Jenkins and the Company that would be reportable under Item 404(a) of Regulation S-K.

Concurrently with the Agreement, the Company entered into an indemnification agreement with Dr. Jenkins (the “Indemnification Agreement”), in the form previously entered into by the Company with each of the Company’s directors and executive officers, the form of which was filed as Exhibit 10.15 to the Amendment No. 1 to Company’s Registration Statement on Form S-1 filed with the Securities and Exchange Commission on September 30, 2014. The Indemnification Agreement, subject to limitations contained therein, will obligate the Company to indemnify Dr. Jenkins, to the fullest extent permitted by applicable law, for certain expenses, including attorneys’ fees, judgments, penalties, fines and settlement amounts actually and reasonably incurred by him in any threatened, pending or completed action, suit, claim, investigation, inquiry, administrative hearing, arbitration or other proceeding arising out of his services as a director. Subject to certain limitations, the Indemnification Agreement provides for the advancement of expenses incurred by the indemnitee, and the repayment to the Company of the amounts advanced to the extent that it is ultimately determined that the indemnitee is not entitled to be indemnified by the Company. The Indemnification Agreement also creates certain rights in favor of the Company, including the right to assume the defense of claims and to consent to settlements. The Indemnification Agreement does not exclude any other rights to indemnification or advancement of expenses to which the indemnitee may be entitled under applicable law, the certificate of incorporation or bylaws of the Company, any agreement, a vote of stockholders or disinterested directors, or otherwise.

The foregoing is a summary of the material terms of the Indemnification Agreement and does not purport to be complete.

On June 6, 2018, the Company issued a press release announcing the appointment of Dr. Jenkins to its Board of Directors. A copy of the press release is furnished as Exhibit 99.1 hereto and shall not be deemed “filed” for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Exchange Act or the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing.

(d) The following exhibit is furnished with this report:

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