SEC Form 3

FORM 3

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

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1. Name and Address of Reporting Person* 5AM Ventures IV, L.P. (Last) (First) (Middle) C/O 5AM VENTURES 501 SECOND STREET, SUITE 350 (Street) SAN FRANCISCO CA 94107 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 05/22/2019	3. Issuer Name and Ticker or Trading Symbol IDEAYA Biosciences, Inc. [ IDYA ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	304,200(1)	I	See footnotes(2)
Common Stock	12,675(1)	I	See footnotes(3)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series A Preferred Stock	(4)	(4)	Common Stock	1,721,898(1)(4)	(4)	I	See footnotes(2)
Series A Preferred Stock	(4)	(4)	Common Stock	71,745(1)(4)	(4)	I	See footnotes(3)
Series B Preferred Stock	(5)	(5)	Common Stock	578,447(1)(5)	(5)	I	See footnotes(2)
Series B Preferred Stock	(5)	(5)	Common Stock	24,101(1)(5)	(5)	I	See footnotes(3)

1. Name and Address of Reporting Person* 5AM Ventures IV, L.P. (Last) (First) (Middle) C/O 5AM VENTURES 501 SECOND STREET, SUITE 350 (Street) SAN FRANCISCO CA 94107 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* 5AM Co-Investors IV, L.P. (Last) (First) (Middle) 501 SECOND STREET, SUITE 350 (Street) SAN FRANCISCO CA 94107 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* 5AM Partners IV, LLC (Last) (First) (Middle) 2200 SAND HILL ROAD, SUITE 110 (Street) MENLO PARK CA 94025 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* ROCKLAGE SCOTT M (Last) (First) (Middle) C/O 5AM VENTURES 501 SECOND STREET, SUITE 350 (Street) SAN FRANCISCO CA 94107 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Schwab Andrew J. (Last) (First) (Middle) C/O 5AM VENTURES 501 SECOND STREET, SUITE 350 (Street) SAN FRANCISCO CA 94107 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Reflects a 1-for-10.2564 reverse stock split of the Issuer's outstanding securities effected prior to the effectiveness of the Issuer's S-1 Registration Statement.

2. The shares are held by 5AM Ventures IV, L.P. ("Ventures IV"). 5AM Partners IV, LLC ("Partners IV") is the sole general partner of Ventures IV. Dr. John Diekman, Andrew J. Schwab and Dr. Scott M. Rocklage, are the managing members of Partners IV, and have shared voting and investment power over the shares beneficially owned by Ventures IV. Each of Partners IV, Dr. Diekman, Mr. Schwab, and Dr. Rocklage disclaims beneficial ownership of such shares except to the extent of its or their pecuniary interest therein.

3. The shares are held by 5AM Co-Investors IV, L.P. ("Co-Investors IV"). Partners IV is the sole general partner of Co-Investors IV. Dr. John Diekman, Andrew J. Schwab and Dr. Scott M. Rocklage, are the managing members of Partners IV, and have shared voting and investment power over the shares beneficially owned by Co-Investors IV. Each of Partners IV, Dr. Diekman, Mr. Schwab, and Dr. Rocklage disclaims beneficial ownership of such shares except to the extent of its or their pecuniary interest therein.

4. Each share of Series A Preferred Stock will automatically convert on a 1-for-1 basis into Common Stock immediately prior to the closing of the Issuer's initial public offering.

5. Each share of Series B Preferred Stock will automatically convert on a 1-for-1 basis into Common Stock immediately prior to the closing of the Issuer's initial public offering.

	/s/ 5AM VENTURES IV, L.P., By: 5AM Partners IV, LLC, its General Partner	05/22/2019
	/s/ 5AM CO-INVESTORS IV, L.P., By: 5AM Partners IV, LLC, its General Partner	05/22/2019
	/s/ 5AM PARTNERS IV, LLC	05/22/2019
	/s/ Scott M. Rocklage	05/22/2019
	/s/ Andrew J. Schwab	05/22/2019
	** Signature of Reporting Person	Date
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