Sec Form 4 Filing - Burgstahler David F @ Osmotica Pharmaceuticals plc - 2020-11-20

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 Burgstahler David F 2. Issuer Name and Ticker or Trading Symbol Osmotica Pharmaceuticals plc [ OSMT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O AVISTA CAPITAL PARTNERS III,, 65 EAST 55TH STREET, 18TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 11/20/2020 (Street) NEW YORK, NY10022 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 Ordinary Shares 11/20/2020 J( 1 ) 4,936,926 ( 1 ) D 0 I By Avista Capital investment fund ( 1 ) Ordinary Shares 15,730,864 I By Avista Capital investment fund ( 2 ) Ordinary Shares 1,032,995 I By Avista Capital investment fund ( 3 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Burgstahler David F C/O AVISTA CAPITAL PARTNERS III, 65 EAST 55TH STREET, 18TH FLOOR NEW YORK, NY10022 X X Signatures By: /s/ David Burgstahler 11/23/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares of the Issuer held by Orbit Co-Invest I LLC. Effective November 20, 2020, Avista Capital Partners III GP, L.P. ("ACP GP") ceased to be the manager of Orbit Co-Invest I LLC. Mr. Burgstahler is a member of the investment committee of ACP GP. As a result, Mr. Burgstahler ceased to have voting or investment power with respect to the shares held by Orbit Co-Invest I LLC. ( 2 )Represents shares of the Issuer held by Avista Healthcare Partners, L.P. ("AHP"). Avista Healthcare Partners GP, Ltd. ("AHP GP") is the general partner of AHP. Mr. Burgstahler is a member of the investment committee of AHP GP. By virtue of this relationship, Mr. Burgstahler may be deemed to share voting and investment power with respect to the shares held by AHP. Mr. Burgstahler disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein, and the inclusion of the shares in this report shall not be deemed to be an admission of beneficial ownership of the reported shares for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise. ( 3 )Represents shares of the Issuer held by Orbit Co-Invest III LLC. ACP GP is the manager of Orbit Co-Invest III LLC. Mr. Burgstahler is a member of the investment committee of ACP GP. By virtue of this relationship, Mr. Burgstahler may be deemed to share voting and investment power with respect to the shares held by Orbit Co-Invest III LLC. Mr. Burgstahler disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein, and the inclusion of the shares in this report shall not be deemed to be an admission of beneficial ownership of the reported shares for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise.

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