Sec Form 4 Filing - Krishnan Suma @ Krystal Biotech, Inc. - 2021-12-10

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 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) Chief Operating Officer (Last) (First) (Middle) C/O KRYSTAL BIOTECH, INC., 2100 WHARTON STREET, SUITE 701 3. Date of Earliest Transaction (MM/DD/YY) 12/10/2021 (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 12/10/2021 S 100,000( 1 ) D $ 70.5 50,000 I By trust( 2 )( 3 ) Common Stock 1,798,226 D Common Stock 1,848,624 I By spouse( 4 )

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 Krishnan Suma C/O KRYSTAL BIOTECH, INC. 2100 WHARTON STREET, SUITE 701 PITTSBURGH, PA15203 X X Chief Operating Officer Signatures /s/ Suma Krishnan 12/14/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On December 3, 2021, Krystal Biotech, Inc. (the "Company"), closed the previously announced underwritten public offering of 2,666,667 shares of its common stock, at a public offering price of $75.00 per share. The Company and certain selling stockholders granted the underwriters a 30-day option to purchase up to an additional 400,000 shares of the Company's common stock offered in the public offering, which includes up to 200,000 shares from the selling stockholders. The underwriters exercised the option and on December 10, 2021, purchased the 400,000 shares of the Company's common stock, including 100,000 shares of the Company's common stock from the Krishnan Family Trust, a selling stockholder. ( 2 )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. ( 3 )Prior to the reported transaction, the Krishnan Family Trust held 112,162 shares. In connection with the reported transaction, 18,919 shares were transferred to the Krishnan Family Trust from the reporting person's individual account and 18,919 shares were transferred to the Krishnan Family Trust from Krish Krishnan's, the reporting person's spouse, individual account. ( 4 )Directly beneficially owned by Krish Krishnan, the spouse of the reporting person.

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).

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