ZENDESK INC

CUSIP: 98936J101 Class: COMMON STOCK

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

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

Q1 2019
Shares 863,786 Value ($000) $73,422 Avg Close — Range —
Q4 2018
Shares 1,425,950 Value ($000) $83,233 Avg Close — Range —