Sec Form 3 Filing - Atlas Venture Fund X, L.P. @ Kymera Therapeutics, Inc. - 2020-08-20

FORM 3 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 Atlas Venture Fund X, L.P. 2. Issuer Name and Ticker or Trading Symbol Kymera Therapeutics, Inc. [ KYMR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 400 TECHNOLOGY SQUARE, 10TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 08/20/2020 (Street) CAMBRIDGE, MA02139 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 752,398 D ( 1 )

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 Series Seed Convertible Preferred Stock ( 2 ) ( 2 ) ( 2 ) Common Stock 1,880,995 D ( 1 ) Series A Convertible Preferred Stock ( 2 ) ( 2 ) ( 2 ) Common Stock 4,388,990 D ( 1 ) Series B Convertible Preferred Stock ( 2 ) ( 2 ) ( 2 ) Common Stock 926,599 D ( 1 ) Series C Convertible Preferred Stock ( 2 ) ( 2 ) ( 2 ) Common Stock 1,112,686 I See footnote ( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Atlas Venture Fund X, L.P. 400 TECHNOLOGY SQUARE, 10TH FLOOR CAMBRIDGE, MA02139 X Atlas Venture Associates X, LLC 400 TECHNOLOGY SQ., 10TH FL CAMBRIDGE, MA02139 X ATLAS VENTURE ASSOCIATES X, L.P. 400 TECHNOLOGY SQ., 10TH FL CAMBRIDGE, MA02139 X Atlas Venture Associates Opportunity I, L.P. 400 TECHNOLOGY SQ., 10TH FL CAMBRIDGE, MA02139 X Atlas Venture Associates Opportunity I, LLC 400 TECHNOLOGY SQ., 10TH FL CAMBRIDGE, MA02139 X Atlas Venture Opportunity Fund I, L.P. 400 TECHNOLOGY SQ., 10TH FL CAMBRIDGE, MA02139 X Signatures Atlas Venture Fund X, L.P., By: Atlas Venture Associates X, L.P., Its: General Partner, By: Atlas Venture Associates X, LLC, Its: General Partner, By: /s/ Ommer Chohan, Ommer Chohan, Chief Financial Officer 08/20/2020 Signature of Reporting Person Date Atlas Venture Associates X, L.P., By: Atlas Venture Associates X, LLC, Its: General Partner, By: /s/ Ommer Chohan, Ommer Chohan, Chief Financial Officer 08/20/2020 Signature of Reporting Person Date Atlas Venture Associates X, LLC, By: /s/ Ommer Chohan, Ommer Chohan, Chief Financial Officer 08/20/2020 Signature of Reporting Person Date Atlas Venture Opportunity Fund I, L.P., By: Atlas Venture Associates Opportunity I, L.P., Its General Partner, By: Atlas Venture Associates Opportunity I, LLC, Its. General Partner, By: /s/ Ommer Chohan, Ommer Chohan, Chief Financial Officer 08/20/2020 Signature of Reporting Person Date Atlas Venture Associates Opportunity I, L.P., By: Atlas Venture Associates Opportunity I, LLC, Its. General Partner, By: /s/ Ommer Chohan, Ommer Chohan, Chief Financial Officer 08/20/2020 Signature of Reporting Person Date Atlas Venture Associates Opportunity I, LLC, By: /s/ Ommer Chohan, Ommer Chohan, Chief Financial Officer 08/20/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These shares are held directly by Atlas Venture Fund X, L.P. ("Atlas Venture Fund X"). The general partner of Atlas Venture Fund X is Atlas Venture Associates X, L.P. ("AVA X LP"). Atlas Venture Associates X, LLC ("AVA X LLC") is the general partner of AVA X LP. Each of AVA X LP and AVA X LLC disclaims Section 16 beneficial ownership of the securities held by Atlas Venture Fund X, except to the extend if its pecuniary interest therein, if any. ( 2 )Each share of Series Seed Preferred Stock, Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock is convertible into common stock on a one-for-1.5949 basis into the number of shares of common stock shown in column 3 at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering. The Series Seed Preferred Stock, Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock have no expiration date. ( 3 )The shares are owned directly by Atlas Venture Opportunity Fund I, L.P. ("AVO I"). Atlas Venture Associates Opportunity I, L.P. ("AVAO LP") is the general partner of AVO I. Atlas Venture Associates Opportunity I, LLC ("AVAO LLC") is the general partner of AVAO LP. Each of AVAO LP and AVAO LLC disclaims Section 16 beneficial ownership of the securities held by AVO I, except to the extent of its pecuniary interest therein, if any.

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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