Sec Form 4 Filing - Krishnan Suma @ Krystal Biotech, Inc. - 2023-01-04

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 Krishnan Suma 2. Issuer Name and Ticker or Trading Symbol Krystal Biotech, Inc. [ KRYS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) President, R&D (Last) (First) (Middle) C/O KRYSTAL BIOTECH, INC., 2100 WHARTON STREET, SUITE 701 3. Date of Earliest Transaction (MM/DD/YY) 01/04/2023 (Street) PITTSBURGH, PA15203 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 Common Stock 01/04/2023 S( 1 ) 3,938 D $ 80.0876( 2 ) 1,702,263 D Common Stock 01/04/2023 S( 3 ) 3,748( 4 ) D $ 80.0801( 2 ) 1,763,688 I By Spouse( 5 ) Common Stock 90,000 I By SMK Trust Common Stock 50,000 I By Krishnan Family Trust( 6 )

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) (Inst r. 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 Krishnan Suma C/O KRYSTAL BIOTECH, INC. 2100 WHARTON STREET, SUITE 701 PITTSBURGH, PA15203 X X President, R&D Signatures /s/ Suma Krishnan 01/05/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The sales reported were pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. The Rule 10b5-1 trading plan started on July 15, 2022 and will terminate on July 15, 2023 and contemplates quarterly sales of 25,000 shares with a limit price of $80.00 per share. ( 2 )The transaction was executed in multiple trades ranging from $80.0000 to $80.5000. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price within the range set forth herein. ( 3 )The sales reported were pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person's spouse, Krish Krishnan. The Rule 10b5-1 trading plan adopted by the Reporting Person's spouse started on July 15, 2022 and will terminate on July 15, 2023 and contemplates quarterly sales of 25,000 shares with a limit price of $80.00 per share. ( 4 )These same shares are also being reported on a Form 4 by the Reporting Person's spouse, Krish Krishnan. ( 5 )Directly beneficially owned by Krish S. Krishnan, the spouse of the Reporting Person. ( 6 )Directly beneficially owned by the Krishnan Family Trust. The Reporting Person and her spouse are each joint beneficial owners of the trust with joint voting and investment control.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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