SIERRA ONCOLOGY INC

CUSIP: 82640U107 Class: COMMON

DRW Securities, LLC's Holding History (CIK: 0001481986)

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

Q1 2018
Shares 80,000 Value ($000) $166 Avg Close — Range —
Q4 2017
Shares 40,000 Value ($000) $149 Avg Close — Range —
Q3 2017
Shares 25,000 Value ($000) $39 Avg Close — Range —
Q2 2017
Shares 25,000 Value ($000) $29 Avg Close — Range —