Sec Form 4 Filing - Hatten Sandra L @ AVADEL PHARMACEUTICALS PLC - 2018-08-10

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Hatten Sandra L 2. Issuer Name and Ticker or Trading Symbol AVADEL PHARMACEUTICALS PLC [ AVDL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) BLOCK 10-1, BLANCHARDSTOWN, CORPORATE PARK, BALLYCOOLIN 3. Date of Earliest Transaction (MM/DD/YY) 08/10/2018 (Street) DUBLIN, L215 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price ADSs ( 1 ) 08/10/2018 S( 2 ) 6,290 D $ 4.906 ( 3 ) 44,010 ( 4 ) D ADSs ( 1 ) 3,400 I By Spouse ( 5 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (right to buy) $ 21.67 ( 6 ) 06/26/2025 ADSs 100,000 100,000 D Stock Option (right to buy) $ 14.35 ( 7 ) 12/10/2025 ADSs 50,000 50,000 D Stock Option (right to buy) $ 10.4 ( 8 ) 12/14/2026 ADSs 80,000 80,000 D Stock Option (right to buy) $ 8.95 ( 9 ) 12/12/2027 ADSs 60,000 60,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hatten Sandra L BLOCK 10-1, BLANCHARDSTOWN CORPORATE PARK, BALLYCOOLIN DUBLIN, L215 See Remarks Signatures /s/ Phillandas T. Thompson, as attorney-in-fact for Sandra L. Hatten 08/14/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The issuer's "ADSs" are American Depositary Shares, with each ADS representing one ordinary share, nominal value $0.01 per share, of the issuer; ADSs may be represented by American Depositary Receipts. ( 2 )On August 10, 2018, the reporting person sold 6,290 ADSs in connection with the payment of certain withholding taxes related to the vesting of restricted ADSs that were granted to the reporting person on August 10, 2016 (such grant was reported by the reporting person on a Form 4 filed on August 12, 2016). ( 3 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.82 to $5.00, inclusive. The reporting person undertakes to provide to Avadel Pharmaceuticals plc, any security holder of Avadel Pharmaceuticals plc, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3). ( 4 )Includes (a) 20,000 restricted ADSs granted under the issuer's "Free Share" award program on 8/10/2016, all of which were issued to the reporting person on the second anniversary of the grant date; (b) 10,000 restricted ADSs granted under the issuer's "Free Share" award program on 12/14/2016, all of which will be issued to the reporting person on the second anniversary of the grant date; and (c) 12,500 restricted shares granted under the issuer's Omnibus Incentive Compensation Plan on 12/12/2017, under which 8,333 ADSs will vest and be issued on the second anniversary of the grant date and the remaining 4,167 ADSs will vest and be issued on the third anniversary of the grant date (with vesting of these restricted shares subject to the reporting person remaining in continuous service until the applicable anniversary of the date of grant). ( 5 )The filing of this statement shall not be construed as an admission that the reporting person is, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the beneficial owner of these securities. The reporting person disclaims beneficial ownership of such securities except to the extent of any pecuniary interest therein. ( 6 )Options become exercisable as to 25,000 ADSs on each of the first four anniversaries after the 06/26/2015 grant date. ( 7 )Options become exercisable as to 12,500 ADSs on each of the first four anniversaries after the 12/10/2015 grant date. ( 8 )Options become exercisable as to 20,000 ADSs on each of the first four anniversaries after the 12/14/2016 grant date. ( 9 )Options become exercisable as to 15,000 ADSs on each of the first four anniversaries after the 12/12/2017 grant date.

Remarks: Sr. VP, Quality and Reg. Affairs.

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