Milla Marcos [Rocket]

Date	Name	Symbol	Type	Security	Shares	Price	Value	Reported
01/23/2020	Synthorx, Inc.	THOR	Disposition	Employee Stock Option (right to buy)	125k	$11.00	$1.4M	01/23/2020
01/23/2020	Synthorx, Inc.	THOR	Disposition	Employee Stock Option (right to buy)	227.8k	$0.93	$211.9k	01/23/2020
01/23/2020	Synthorx, Inc.	THOR	Disposition	Employee Stock Option (right to buy)	89.2k	$0.63	$56.2k	01/23/2020
01/23/2020	Synthorx, Inc.	THOR	Other	Common Stock	64k	$68.00	$4.4M	01/23/2020
12/30/2019	Synthorx, Inc.	THOR	Exercise	Employee Stock Option (right to buy)	98k	$0.63	$61.7k	12/30/2019
12/30/2019	Synthorx, Inc.	THOR	Payment of Exercise	Common Stock	52k	$70.63	$3.7M	12/30/2019
12/17/2019	Synthorx, Inc.	THOR	Grant	Common Stock	18k	$0.00	$0	12/17/2019
12/06/2018	Synthorx, Inc.	THOR	Grant	Employee Stock Option (right to buy)	125k	$11.00	$1.4M	12/06/2018