IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE GENERAL MEETING OF SHAREHOLDERS OF ATLASSIAN TO BE HELD ON
AUGUST 22, 2022. A COPY OF THE PROXY STATEMENT IS AVAILABLE AT www.proxyvote.com. PLEASE READ THE NOTICE OF GENERAL MEETING IN THE PROXY STATEMENT BEFORE COMPLETING AND SIGNING THE FORM. Notes 1. A member of the Company entitled to attend and
vote at the General Meeting may appoint one or more proxies to attend and vote instead of him/her. A proxy need not be a member of the Company but must attend the meeting in person to represent you. Return of a proxy card will not preclude a member
from attending and voting at the General Meeting in person should he/she so decide. 2. To appoint as a proxy a person other than the chair of the meeting insert the full name in the space provided. To appoint more than one proxy you may photocopy
this form. Please indicate the proxy holder’s name and the number of Atlassian Shares in relation to which they are authorised to act as your proxy (which, in aggregate, should not exceed the number of Atlassian Shares held by you). Please also
indicate if the proxy instruction is one of multiple instructions being given. All forms must be signed and should be returned together in the same envelope. A proxy need not be a member of the Company. D88959-S48315 ATLASSIAN CORPORATION PLC
(“ATLASSIAN”) GENERAL MEETING AUGUST 22, 2022 AT 2:30 P.M. PACIFIC TIME (OR AS SOON THEREAFTER AS THE COURT MEETING SHALL HAVE BEEN CONCLUDED OR ADJOURNED) THIS PROXY IS SOLICITED BY THE BOARD OF DIRECTORS WHITE PROXY The undersigned
hereby appoint(s) Steven Sordello or, failing him, Enrique Salem (or alternatively the person named below) as proxy, with the power to appoint a substitute, and hereby authorize(s) them or their appointed substitutes to represent and to vote, as
designated below, each of them or their appointed substitutes to represent and to vote, as designated below, all of the Class A ordinary shares of Atlassian and Class B ordinary shares of Atlassian held of record by the undersigned as of
6:00 p.m. (Pacific Time) on August 8, 2022, at the General Meeting of Company shareholders to be held on August 22, 2022 or any adjournment or postponement thereof. Please print the name of the person you are appointing as proxy if it is
someone other than the above appointees: This WHITE proxy, when properly executed, will be voted in the manner directed herein by the undersigned shareholder. If no direction is made, the proxy will be voted in accordance with the recommendations of
the board of directors of Atlassian with respect to the resolution described on the reverse side of this proxy card and in the proxy’s discretion upon such other business as may properly come before the meeting or any adjournment or
postponement thereof. The board of directors of Atlassian recommends a vote “FOR” the resolution described on the reverse side of this proxy card. SPECIAL INFORMATION FOR BENEFICIAL OWNERS OF ATLASSIAN CORPORATION PLC SHARES HELD IN THE
COMPUTERSHARE DEPOSITARY: Beneficial owners of Atlassian Shares held by Computershare DR Nominees Limited as custodian for Computershare Trustees (Jersey) Limited (the “Computershare Depositary”) hereby instruct the Computershare
Depositary to procure that the relevant Atlassian Shares are voted in accordance with the instructions indicated on the reverse side of this card, and in accordance with the judgement of the Computershare Depositary upon other business as may
properly come before the Meeting and any adjournment or postponement thereof. You may not vote directly at the Meeting in relation to your beneficial ownership of Atlassian Shares; the Computershare Depositary shall instead procure that the relevant
Atlassian Shares are voted. The Computershare Depositary must receive your proxy instructions no later than 11:59 p.m. (Eastern Time) on August 16, 2022. If no such instructions are received by this time the Computershare Depositary will take
no action in respect of the relevant Atlassian Shares. Please note that Broadridge have been appointed as agent to tally the vote and provide the tabulated instructions to the Computershare Depositary prior to the Meeting. Continued and to be signed
on reverse side
