ZENDESK INC

CUSIP: 98936J101 Class: COMMON STOCK

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q2 2022
Shares 10,451 Value ($000) $774 Avg Close — Range —
Q1 2022
Shares 130,220 Value ($000) $15,664 Avg Close — Range —
Q4 2021
Shares 17,372 Value ($000) $1,812 Avg Close — Range —
Q4 2019
Shares 1,206 Value ($000) $92 Avg Close — Range —
Q2 2019
Shares 7,732 Value ($000) $688 Avg Close — Range —
Q1 2019
Shares 4,679 Value ($000) $398 Avg Close — Range —
Q3 2018
Shares 12,796 Value ($000) $909 Avg Close — Range —
Q2 2018
Shares 8,069 Value ($000) $440 Avg Close — Range —
Q4 2017
Shares 18,450 Value ($000) $624 Avg Close — Range —
Q3 2017
Shares 7,923 Value ($000) $231 Avg Close — Range —
Q2 2017
Shares 6,791 Value ($000) $189 Avg Close — Range —
Q3 2016
Shares 11,786 Value ($000) $362 Avg Close — Range —
Q2 2016
Shares 20,190 Value ($000) $533 Avg Close — Range —
Q1 2016
Shares 7,737 Value ($000) $162 Avg Close — Range —
Q3 2015
Shares 13,614 Value ($000) $268 Avg Close — Range —
Q2 2015
Shares 1,497 Value ($000) $33 Avg Close — Range —
Q1 2015
Shares 2,415 Value ($000) $55 Avg Close — Range —
Q4 2014
Shares 215 Value ($000) $5 Avg Close — Range —
Q3 2014
Shares 3,557 Value ($000) $77 Avg Close — Range —