AGL Energy is owned by a diverse group of shareholders including institutional investors, retail investors, private companies, and individual insiders. The largest shareholder is State Street Global Advisors, Inc., holding about 8.1% of shares. Other significant institutional shareholders include Franklin Resources and The Vanguard Group, each holding around 4.7%. Additionally, Atlassian co-CEO Mike Cannon-Brookes took an 11% stake in AGL Energy in 2022, aiming to influence the company's energy policies. Retail investors constitute nearly 60% of the shareholder base, holding a substantial portion of the company's shares.