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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1395937	Syndax Pharmaceuticals Inc	SNDX	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1026765	Ivor Royston	C/O Syndax Pharmaceuticals, Inc. 400 Totten Pond Road, Suite 110 Waltham MA 02451		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2016-03-08	315,195	$0.00	315,195	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2016-03-08	198,931	$0.00	514,126	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2016-03-08	86,419	$0.00	600,545	No	4	C	Indirect	See footnote
Common Stock	Acquisiton	2016-03-08	150,000	$12.00	750,545	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	See footnote
No	4	C	Indirect	See footnote
No	4	C	Indirect	See footnote
No	4	P	Indirect	See footnote

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A-1 Preferred Stock	Disposition	2016-03-08	315,195	$0.00	315,195	$0.00
Common Stock	Series B-1 Preferred Stock	Disposition	2016-03-08	198,931	$0.00	198,931	$0.00
Common Stock	Series C-1 Preferred Stock	Disposition	2016-03-08	86,419	$0.00	86,419	$0.00

Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect

Footnotes

Upon the closing of the Issuer's initial public offering of its common stock, each share of Series A-1, Series B-1 and Series C-1 preferred stock automatically converted into one share of common stock. The Series A-1, Series B-1 and Series C-1 preferred stock had no expiration date.
The securities are owned directly by Forward Ventures V, LP ("Forward V"), Forward Ventures IV, LP ("Forward IV") and Forward Ventures IVB, LP ("Forward IVB" and collectively, the "Forward Entities"). Dr. Royston is a member of Forward V and a managing member of Forward IV Associates, LLC which is the general partner of each of Forward IV and Forward IVB. As a result, Dr. Royston shares voting and investment power over the shares owned by the Forward Entities. Dr. Royston disclaims beneficial ownership of all shares held by the Forward Entities, except to the extent of his actual pecuniary interest therein.