AVEXIS INC

CUSIP: 05366U100 Class: Common equity shares

VIKING GLOBAL INVESTORS LP's Holding History (CIK: 0001103804)

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

Q1 2018
Shares 292,740 Value ($000) $36,177 Avg Close — Range —
Q4 2017
Shares 478,338 Value ($000) $52,938 Avg Close — Range —
Q3 2017
Shares 591,360 Value ($000) $57,202 Avg Close — Range —
Q2 2017
Shares 893,258 Value ($000) $73,390 Avg Close — Range —
Q1 2017
Shares 381,626 Value ($000) $29,015 Avg Close — Range —