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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1395937	Syndax Pharmaceuticals Inc	SNDX	Pharmaceutical Preparations (2834)	320162505

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1654430	Briggs Morrison	C/O Syndax Pharmaceuticals, Inc. 35 Gatehouse Drive, Building D, Floor 3 Waltham MA 02451	President, Head Of R&D	No	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
Common Stock	Acquisiton	2022-09-19	114,339	$10.90	132,175	No	4	M	Direct
Common Stock	Disposition	2022-09-19	114,339	$23.03	17,836	No	4	S	Direct
Common Stock	Acquisiton	2022-09-20	59,649	$10.90	77,485	No	4	M	Direct
Common Stock	Disposition	2022-09-20	59,649	$23.25	17,836	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Options (Right to buy)	Disposition	2022-09-19	114,339	$0.00	114,339	$10.90
Common Stock	Stock Options (Right to buy)	Disposition	2022-09-20	59,649	$0.00	59,649	$10.90

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2025-09-09	No	4	M	Direct
0		2025-09-09	No	4	M	Direct

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 plan adopted by the Reporting Person. Following the sales reported in this Form 4, the Reporting Person has a total of 774,958 options to purchase shares of common stock that are vested and immediately exercisable and a total of 370,042 options to purchase shares of common stock that have not yet vested.
The sale prices ranged from $22.50 to $23.35
The sale prices ranged from $22.60 to $23.75
This option is fully vested.