SIERRA ONCOLOGY INC

CUSIP: 82640U107 Class: COMMON

Parallax Volatility Advisers, L.P.'s Holding History (CIK: 0001521001)

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

Q2 2018
Shares 6,770 Value ($000) $20 Avg Close — Range —
Q1 2018
Shares 6,770 Value ($000) $14 Avg Close — Range —
Q4 2017
Shares 6,770 Value ($000) $25 Avg Close — Range —
Q3 2017
Shares 6,770 Value ($000) $10 Avg Close — Range —