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): January 6, 2020

EIGER BIOPHARMACEUTICALS, INC.

(Exact name of registrant as specified in its charter)

Eiger BioPharmaceuticals, Inc.

2155 Park Blvd.

Palo Alto, California 94306

(Address of principal executive offices, including zip code)

(650) 272-6138

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report.)

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:

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 (§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.  ☐

In connection with the press release described in Item 8.01 below, on January 6, 2020, Eiger BioPharmaceuticals, Inc. (the “Company”) announced that on a preliminary and unaudited basis, it estimates that it had approximately $95 million in cash, cash equivalents and investments as of December 31, 2019. The estimate is a preliminary estimate based on currently available information and does not present all necessary information for a complete understanding of the Company’s financial condition as of December 31, 2019 or the Company’s results of operations for the year ended December 31, 2019.

The information in this item 2.02 shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that Section 11 and 12(a)(2) of the Securities Act of 1933, as amended. The information in this item 2.02 shall not be incorporated by reference into any filing with the U.S. Securities and Exchange Commission made by Eiger BioPharmaceuticals, Inc., whether made before or after the date hereof, regardless of any general incorporation language in such filing.

On January 6, 2020, the Company issued a press release titled “Eiger Updates on 2019 Progress and 2020 Milestones Expected.” A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Forward-Looking Statements

Statements in this report that are not strictly historical in nature constitute “forward-looking statements.” Such statements include, but are not limited to the cash, cash equivalents and investments as of December 31, 2019. Such forward-looking statements involve known and unknown risks, uncertainties and other factors. More information about the risks the Company faces is included under the headings “Risk Factors” in the Company’s most recently filed documents with the U.S. Securities and Exchange Commission. The Company is providing this information as of this date and does not undertake any obligation to update any forward-looking statements contained in this report as a result of new information, future events or otherwise.

(d) 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.