UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No.1)

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 28, 2019

Eagle Pharmaceuticals, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (201) 326-5300

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:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

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. ¨

Explanatory Note

In accordance with Instruction No. 2 to Item 5.02 of Form 8-K, Eagle Pharmaceuticals, Inc., or the Company, is filing this Current Report on Form 8-K/A, or the Amendment Filing, to amend the Current Report on Form 8-K filed by the Company with the Securities and Exchange Commission on September 3, 2019, or the Original Filing. Except as expressly set forth herein, this Amendment Filing does not amend, modify or update the disclosures contained in the Original Filing.

Item 5.02 Election of Directors; Departure of Directors or Certain Officers; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Appointment of Director

As reported in the Original Filing, effective on August 28, 2019, the Board of Directors, or the Board, of the Company approved the appointment of Jennifer K. Simpson, Ph.D., M.S.N., C.R.N.P., as a director of the Company. The Board had not appointed Dr. Simpson to any committees of the Board as of the date of the Original Filing.

On October 8, 2019, upon recommendation of the Nominating and Corporate Governance Committee of the Board, the Board appointed Dr. Simpson to its Nominating and Corporate Governance Committee, effective immediately. Following the appointment, the membership of the Nominating and Corporate Governance Committee consists of: Michael Graves (chair), Robert Glenning, Richard A. Edlin, J.D., and Dr. Simpson.

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.