13G Filing: Balyasny Asset Management and Sunesis Pharmaceuticals Inc (SNSS)

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

SUNESIS
PHARMACEUTICALS, INC.

(Name of Issuer)

COMMON STOCK

(Title of
Class of Securities)

867328700

(CUSIP Number)

June 23,
2017

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☒
Rule 13d-1(c)

☐ Rule 13d-1(d)

The
information required on the remainder of this cover page shall not be deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see the Notes).