[SCHEDULE 13G/A] Atlassian Corp Amended Passive Investment Disclosure

Rhea-AI Filing Summary

Atlassian Corporation ownership filing shows Michael Cannon-Brookes beneficially owns 275,940 shares of Class A Common Stock and 47,066,808 shares of Class B Common Stock (held of record by CBC Co Pty Ltd as trustee of the Cannon-Brookes Head Trust). The filing states these holdings equal 22.7% of the Class A common stock on a conversion basis and represent approximately 42.7% of the aggregate combined voting power as of March 31, 2026.

The reporting person has sole voting and dispositive power with respect to 47,342,748 shares. The filing notes each Class B share converts into one Class A share for percentage calculations under Rule 13d-3, and that Class B shares carry ten votes per share for voting-power comparisons.

Insights

Corporate Governance Specialist

Founder holds concentrated dual‑class voting stake with sole control of shares.

The filing documents that 47,342,748 shares are under the reporting person's sole voting and dispositive power, held through CBC Co Pty Ltd as trustee. It confirms the dual‑class structure: Class A = one vote, Class B = ten votes.

Because the percent-of-class figure is calculated on a conversion basis under Rule 13d-3, the filing separates percentage-of-class from voting-power metrics; subsequent disclosures may show voting-power effects tied to transfers or conversions described in the certificate of incorporation.

Equity Ownership Analyst

Ownership percentages provided with specific outstanding share counts and voting-power note.

The filing states 161,730,398 Class A and 94,133,617 Class B shares outstanding as of March 31, 2026, and reports a 22.7% Class A equivalent stake and 42.7% of combined voting power. Figures are reported by the issuer to the reporting person.

These metrics are useful for assessing control concentration; any transfer-triggered conversions or permitted transfers in the certificate of incorporation would change voting dynamics if executed.

Key Figures

Class A shares beneficially owned: 275,940 shares Class B shares beneficially owned: 47,066,808 shares Sole voting/dispositive power: 47,342,748 shares +3 more

6 metrics

Class A shares beneficially owned 275,940 shares held by CBC Co Pty Ltd trustee

Class B shares beneficially owned 47,066,808 shares held of record by CBC Co Pty Ltd as trustee

Sole voting/dispositive power 47,342,748 shares sole voting and dispositive power reported

Percent of Class A (conversion basis) 22.7% calculated under Rule 13d-3 as of March 31, 2026

Combined voting power 42.7% aggregate combined voting power as of March 31, 2026

Shares outstanding used 161,730,398 Class A; 94,133,617 Class B outstanding as of March 31, 2026

Key Terms

Class B Common Stock conversion, Rule 13d-3, aggregate combined voting power, sole dispositive power

4 terms

Class B Common Stock conversion financial

"Each share of Class B Common Stock is convertible into one share of Class A Common Stock"

Rule 13d-3 regulatory

"treated as converted into shares of Class A Common Stock only for purposes of computing the percentage ownership pursuant to Rule 13d-3"

Rule 13d-3 defines who is treated as the beneficial owner of a company’s shares for U.S. securities disclosure rules — essentially anyone who has the power to vote or direct how shares are voted, or the power to buy or sell them, even if they don’t hold the certificates. For investors this matters because crossing certain ownership thresholds triggers public filing and disclosure obligations and signals potential control or influence, much like having the keys to a car implies you can drive it even if it’s registered to someone else.

aggregate combined voting power financial

"represent approximately 42.7% of the aggregate combined voting power"

sole dispositive power legal

"Sole power to dispose or to direct the disposition of: 47,342,748"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

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Available on EDGAR 05/15/2026 - 04:51 PM Accepted by SEC EDGAR 05/15/2026 - 04:50 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 15)

Atlassian Corporation

(Name of Issuer)

Class A Common Stock

(Title of Class of Securities)

049468101

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 049468101

1

Names of Reporting Persons

Michael Cannon-Brookes

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

AUSTRALIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 47,342,748.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 47,342,748.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

47,342,748.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

22.7 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: The shares reflected in Row 9 represent 275,940 shares of Class A Common Stock and 47,066,808 shares of Class B Common Stock held of record by CBC Co Pty Ltd as trustee of the Cannon-Brookes Head Trust. The reporting person has sole voting power and sole dispositive power with respect to these shares. Each share of Class B Common Stock is convertible into one share of Class A Common Stock at any time at the option of the holder and upon the occurrence of certain other events as described in the Certificate of Incorporation of Atlassian Corporation (the "Issuer"). In addition, each share of Class B Common Stock will automatically convert into one share of Class A Common Stock upon any transfer, except for certain permitted transfers described in the Issuer's Certificate of Incorporation. The percent of class reflected in Row 11 was calculated based on 161,730,398 shares of Class A Common Stock and 94,133,617 shares of Class B Common Stock outstanding as of March 31, 2026, as reported by the Issuer to the reporting person, including the 47,342,748 shares of Class B Common Stock beneficially owned by the reporting person. The shares of Class B Common Stock held by the reporting person are treated as converted into shares of Class A Common Stock only for purposes of computing the percentage ownership of the reporting person pursuant to Rule 13d-3 of the Act. Each share of Class A Common Stock is entitled to one vote and each share of Class B Common Stock is entitled to ten votes. The percentage reported does not reflect the ten for one voting power of the Class B Common Stock. The shares of Class A Common Stock and shares of Class B Common Stock held by the reporting person represent approximately 42.7% of the aggregate combined voting power of the outstanding shares of Class A Common Stock and Class B Common Stock.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Atlassian Corporation
(b)	Address of issuer's principal executive offices: 350 Bush Street, Floor 13, San Francisco, California, 94104
Item 2.
(a)	Name of person filing: Michael Cannon-Brookes
(b)	Address or principal business office or, if none, residence: Level 6, 341 George Street, Sydney, NSW 2000, Australia
(c)	Citizenship: Australia
(d)	Title of class of securities: Class A Common Stock
(e)	CUSIP No.: 049468101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 275,940 shares of Class A Common Stock and 47,066,808 shares of Class B Common Stock held of record by CBC Co Pty Ltd as trustee of the Cannon-Brookes Head Trust.
(b)	Percent of class: Represents 22.7% of the outstanding shares of Class A Common Stock. This assumes that beneficially owned shares are treated as converted into shares of Class A Common Stock only for purposes of computing the percentage ownership of the reporting person pursuant to Rule 13d-3 of the Act. The percentage reported does not reflect the ten for one voting power of the Class B Common Stock. The percent of class was calculated based on 161,730,398 shares of Class A Common Stock outstanding as of March 31, 2026, plus 47,066,808 shares of Class B Common Stock beneficially owned by the reporting person.There were 161,730,398 shares of Class A Common Stock and 94,133,617 shares of Class B Common Stock outstanding as of March 31, 2026. The 275,940 shares of Class A Common Stock and 47,066,808 shares of Class B Common Stock held by the reporting person represent approximately 42.7% of the aggregate combined voting power of the outstanding shares of Class A Common Stock and Class B Common Stock.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 47,342,748
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 47,342,748
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Michael Cannon-Brookes

Signature:	/s/ Grant Reid
Name/Title:	Grant Reid, Attorney in Fact for Michael Cannon-Brookes
Date:	05/15/2026