UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Amendment No. 1)

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended: September 30, 2017

AVADEL PHARMACEUTICALS PLC

(Exact name of registrant as specified in its charter)

Block 10-1, Blanchardstown Corporate Park

Ballycoolin

Dublin 15, Ireland

(Address of Principal Executive Office and Zip Code)

+353-1-485-1200

(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

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 ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No x

At November 2, 2017, 39,762,209 ordinary shares, nominal value $0.01 each, of the Company were outstanding.

 Explanatory Note

Avadel Pharmaceuticals plc (the “Company”) is filing this Amendment No. 1 (this “Form 10-Q/A”) to Quarterly Report on Form 10-Q to amend the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2017, as filed with the Securities and Exchange Commission (the “SEC”) on November 9, 2017 (the “Original Filing”). This Form 10-Q/A is being filed solely to re-file Exhibit 10.7 to the Original Filing (the “Exhibit”). Due to a clerical error, certain paragraphs under Section 8.2 (Milestone Payments) of the Exhibit in the Original Filing contained incorrect sequential paragraph numbering. Specifically, the paragraph titled “Tier One Commercialization Milestone Payments” should be marked as Section 8.2(b); the paragraph titled “Tier Two Commercialization Milestone Payments” should be marked as Section 8.2(c); and the paragraph titled “Change of Control Payment” should be marked as Section 8.2(d). The Exhibit, as re-filed in this Form 10-Q/A, contains the correct sequential paragraph numbering. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, new certifications by the Company’s principal executive officer and principal financial officer are filed as exhibits to this Form 10-Q/A.

No other changes have been made to the Original Filing. This Form 10-Q/A continues to speak as of the original filing date of the Original Filing, does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update any related disclosures made in the Original Filing.

ITEM 6. EXHIBITS. 

SIGNATURES 

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on our behalf by the undersigned thereunto duly authorized.