UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C FORM 6-K

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1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C FORM 6-K Report of Foreign Private Issuer Pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934 May 25, 2018 Commission File Number Atlassian Corporation Plc (Exact name of Registrant as specified in its charter) Not Applicable (Translation of registrant s name into English) Exchange House Primrose Street London EC2A 2EG c/o Herbert Smith Freehills LLP (Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant s Principal Executive Offices) Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F: Form 20-F xform 40-F Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

2 Other Events. On May 25, 2018, Atlassian Corporation Plc, a leading provider of team collaboration and productivity software, announced that Scott Farquhar and Mike Cannon- Brookes each adopted a new stock trading plan in February 2018 in accordance with guidelines specified under Rule 10b5-1 of the Securities and Exchange Act of 1934, as amended (the Exchange Act ), and the policies of Atlassian regarding stock transactions. The information in this report on Form 6-K and the exhibit attached hereto shall not be deemed filed for purposes of Section 18 of the Exchange Act or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

3 Signature Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: May 25, 2018 Atlassian Corporation Plc (Registrant) /S/ James Beer James Beer Chief Financial Officer (Principal Financial Officer)

4 Exhibit Index Exhibit Number Exhibit Title 99.1 Press Release dated May 25, 2018.

5 Atlassian Co-CEOs Adopt New 10b5-1 Trading Plans SAN FRANCISCO (May 25, 2018) - Atlassian Corporation Plc (NASDAQ: TEAM), a leading provider of team collaboration and productivity software, today announced that Scott Farquhar and Mike Cannon-Brookes, co-ceos, co-founders and directors of Atlassian, each adopted a new stock trading plan in February 2018 in accordance with guidelines specified under Rule 10b5-1 of the Securities and Exchange Act of 1934, as amended, and the policies of Atlassian regarding stock transactions. These pre-arranged trading plans were adopted in order to allow Mr. Farquhar and Mr. Cannon-Brookes to sell a portion of their Atlassian stock over time as part of their long-term strategies for individual asset diversification and liquidity. Using these new trading plans, Mr. Farquhar and Mr. Cannon-Brookes will spread their stock trades out over a period of a year from the time their current trading plans expire in June 2018 to reduce market impact on any given day. All sales of shares under Mr. Farquhar s and Mr. Cannon-Brookes trading plans are subject to volume limitations, pursuant to Rule 144, which limits the amount of shares that can be sold in any three-month period. In the aggregate, Mr. Farquhar and Mr. Cannon-Brookes currently hold approximately million Class B ordinary shares and 489,430 Class A ordinary shares, which represent approximately 54.70% of Atlassian s outstanding Class B and Class A ordinary shares, taken together, and approximately 91.49% of the voting power. Under the terms of the new trading plans, Mr. Farquhar and Mr. Cannon-Brookes each intends to sell up to approximately 2.54 million Class B ordinary shares (with such shares converting into Class A ordinary shares prior to sale). If Mr. Farquhar and Mr. Cannon-Brookes complete all the planned sales under their current and new trading plans, they would continue to collectively own approximately million Class B ordinary shares, which would represent approximately 52.48% of Atlassian s outstanding Class B and Class A ordinary shares, taken together, and approximately 90.84% of the voting power (assuming no other issuances, repurchases, sales or conversions of Atlassian s capital stock occur). Each Class B ordinary share is entitled to ten votes and each Class A ordinary share is entitled to one vote. About Atlassian Atlassian unleashes the potential of every team. Our collaboration software helps teams organize, discuss and complete shared work. Teams at more than 119,000 customers, across large and small organizations - including Citigroup, ebay, Coca-Cola, Visa, BMW and NASA - use Atlassian s project tracking, content creation and sharing, real-time communication and service management products to work better together and deliver quality results on time. Learn more about products including Jira Software, Confluence, Stride, Trello, Bitbucket and Jira Service Desk at Investor Relations Contact Ian Lee IR@atlassian.com Media Contact Scott Rubin press@atlassian.com