6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16

under the Securities Exchange Act of 1934

September 9, 2021

Commission File Number 001-37651

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 of principal executive office)

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 x Form 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): ¨

Change in the Board of Directors and Board Committees.

On September 3, 2021, the Board of Directors (the “Board”) of Atlassian Corporation Plc (the “Company”) appointed Michelle Zatlyn to serve as a member of the Board. In addition, the Board also appointed Ms. Zatlyn to serve as a member of the Company’s Audit Committee. Ms. Zatlyn is the co-founder, President, Chief Operating Officer and member of the board of directors of Cloudflare, Inc. (“Cloudflare”).

Ms. Zatlyn will participate in the non-employee directors’ compensation arrangements as described in the Company’s Annual Report on Form 20-F for the fiscal year ended June 30, 2021, filed with the Securities and Exchange Commission (the “SEC”) on August 13, 2021. Under the terms of those arrangements, Ms. Zatlyn will receive a $55,000 retainer for annual service on the Board and an annual award of restricted share units (“RSUs”) having a fair market value of $250,000 (the “Annual Grant”), in each case pro-rated for the year based on the time between her appointment and the Company’s next annual meeting of shareholders. At the next annual meeting of shareholders, the value of the new Annual Grant will be increased to $265,000. These RSUs will vest in full on the earlier of (i) the one-year anniversary of the grant date or (ii) the next annual meeting of shareholders, subject to continued service as a director through the applicable vesting date, unless the Compensation and Leadership Development Committee of the Board determines that circumstances warrant continuation of vesting. All RSUs granted to our non-employee directors are subject to 100% accelerated vesting upon the sale of the Company.

There are no arrangements or understandings between Ms. Zatlyn and any other persons pursuant to which Ms. Zatlyn was named a director of the Company. The Company will also enter into its standard form of indemnification agreement with Ms. Zatlyn (in substantially the form filed with the SEC as Exhibit 10.1 to the Company’s Registration Statement on Form F-1 on November 9, 2015), which will require the Company to indemnify Ms. Zatlyn, to the fullest extent permitted under applicable law, for certain liabilities to which she may become subject to in the execution or discharge of her duties. In fiscal year 2021, Cloudflare purchased approximately $427,000 of the Company’s products and the Company purchased approximately $72,000 of Cloudflare’s products. To date, in fiscal year 2022, Cloudflare has purchased approximately $4,700 of the Company’s products. These purchases were at arms-length and in the ordinary course and were not negotiated by Ms. Zatlyn. Ms. Zatlyn does not have a direct or indirect material interest in these transactions.

Following the above appointment, the directors and Board committee composition of the Company are as follows:

(1) Chair of the Board

The press release announcing Ms. Zatlyn’s appointment as director of the Company is attached as Exhibit 99.1 to this report on Form 6-K and is filed herewith.

Signature

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Exhibit Index

ex991

Atlassian Appoints Michelle Zatlyn, Cloudflare Co-Founder, President, and COO, to Board of Directors TEAM, Anywhere/SAN FRANCISCO (September 9, 2021) — Atlassian Corporation Plc (NASDAQ: TEAM), a leading provider of team collaboration and productivity software, today announced it has appointed Michelle Zatlyn to its board of directors. Michelle is the co-Founder, COO, and President of Cloudflare, Inc. (NYSE: NET), the security, performance, and reliability company helping to build a better Internet. “When Michelle and her fellow co-founders started Cloudflare 11 years ago, they began with the mission to help build a better Internet,” said Mike Cannon-Brookes, Atlassian’s co-founder and co- CEO. “That core ethos has been central to Cloudflare’s incredible growth to a public company with 16 global offices and over 2,000 employees. We are thrilled that she will bring her experience and perspective as a proven operator at such a mission-driven and disruptive company like Cloudflare to the Atlassian board.” Cloudflare is a global cloud services provider that delivers a broad range of services to businesses of all sizes and in all geographies—making them more secure, enhancing the performance of their business-critical applications, and eliminating the cost and complexity of managing individual network hardware. Michelle has led Cloudflare since its inception, overseeing operations as the company transformed from a startup to a leading Internet security and infrastructure company that made its debut on the New York Stock Exchange in September 2019. Today Cloudflare blocks an average of 87 billion cyber threats each day for its customers, which includes approximately 19% of the Fortune 1,000. Prior to co-founding Cloudflare, Michelle held positions at Google and Toshiba. Michelle currently sits on the World Economic Forum Young Global Leaders Foundation Board, and previously served on The NextGen Advisory Board for the Computer History Museum, as well as The Open Internet Advisory Committee Board for the Federal Communications Commission. Michelle has earned many industry recognitions including being named to Fortune's 40 Under 40 list and was part of Marie Claire's 7th Annual New Guard, focused on women in all sectors who are known for their leadership and vision. Michelle was also awarded the “Icon of Canadian Entrepreneurship” (ICE) by C100, for her impact on the world of technology and on the Canadian entrepreneurial community. She holds a B. Sc. degree, with distinction, from McGill University, and an MBA from Harvard Business School, where she was awarded the Dubilier Prize for Entrepreneurship. About Atlassian Atlassian unleashes the potential of every team. Our team collaboration and productivity software helps teams organize, discuss, and complete shared work. Teams at more than 200,000 customers, across large and small organizations - including Bank of America, Redfin, NASA, Verizon, and Dropbox - use Atlassian’s project tracking, content creation and sharing, and service management products to work better together and deliver quality results on time. Learn more about our products, including Jira Software, Confluence, Jira Service Management, Trello, Bitbucket, and Jira Align at https://atlassian.com/. Media Contact Jake Standish press@atlassian.com Investor Relations Contact Martin Lam IR@atlassian.com