ARSANIS INC

CUSIP: 042873109 Class: COM

FMR LLC's Holding History (CIK: 0000315066)

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

Q3 2018
Shares 134 Value ($000) $0 Avg Close — Range —
Q2 2018
Shares 1,108,450 Value ($000) $4,024 Avg Close — Range —
Q1 2018
Shares 1,544,900 Value ($000) $35,363 Avg Close — Range —
Q4 2017
Shares 1,548,900 Value ($000) $19,764 Avg Close — Range —