SIERRA ONCOLOGY INC

CUSIP: 82640U107 Class: COMMON

DEERFIELD MANAGEMENT COMPANY, L.P.'s Holding History (CIK: 0001009258)

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

Q2 2018
Shares 1,764,889 Value ($000) $5,224 Avg Close — Range —
Q1 2018
Shares 1,764,889 Value ($000) $3,653 Avg Close — Range —
Q4 2017
Shares 1,761,092 Value ($000) $6,569 Avg Close — Range —
Q3 2017
Shares 2,800,000 Value ($000) $4,340 Avg Close — Range —
Q2 2017
Shares 3,495,734 Value ($000) $4,090 Avg Close — Range —
Q1 2017
Shares 4,972,319 Value ($000) $7,608 Avg Close — Range —