Third Amendment to the Alphatec Holdings, Inc. 2016 Employment Inducement Award Plan, dated October 1, 2017

Exhibit 10.4

THIRD AMENDMENT TO THE

ALPHATEC HOLDINGS, INC.

2016 EMPLOYMENT INDUCEMENT AWARD PLAN

This Third Amendment (this “Amendment”) to the Alphatec Holdings, Inc. 2016 Employment Inducement Award Plan (as amended and/or restated to date, the “Plan”) is made and adopted by Alphatec Holdings, Inc. (the “Company”), a corporation organized under the laws of State of Delaware.

1.    Section 3(a) of the Plan is hereby amended to read as follows:

2.    This Amendment is effective as of October 2, 2017.

3.    This Amendment shall be and is hereby incorporated in and forms a part of the Plan. All other terms and provisions of the Plan shall remain unchanged except as specifically modified herein. The Plan, as amended by this Amendment, is hereby ratified and confirmed.

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I hereby certify that the foregoing Amendment was duly adopted by the Board of Directors of the Company on October 2, 2017.