CYTOMX THERAPEUTICS INC

Ticker: CTMX CUSIP: 23284F105 Class: COM

EcoR1 Capital, LLC's Holding History (CIK: 0001587114)

Note: Option positions (PUT/CALL) are excluded.

Q1 2020

Shares 1,101 Value ($000) $8 Avg Close $6.97 Range $3.60 - $8.63

Q4 2019

Shares 410,000 Value ($000) $3,407 Avg Close $6.75 Range $5.10 - $9.00

Q3 2017

Shares 829,771 Value ($000) $15,077 Avg Close $15.60 Range $13.09 - $18.31

Q2 2017

Shares 794,969 Value ($000) $12,322 Avg Close $15.07 Range $13.00 - $18.01

Q1 2017

Shares 794,969 Value ($000) $13,729 Avg Close $13.16 Range $10.40 - $20.02

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2020	1,101	$8	$6.97	$3.60 - $8.63
Q4 2019	410,000	$3,407	$6.75	$5.10 - $9.00
Q3 2017	829,771	$15,077	$15.60	$13.09 - $18.31
Q2 2017	794,969	$12,322	$15.07	$13.00 - $18.01
Q1 2017	794,969	$13,729	$13.16	$10.40 - $20.02