Japan Post Holdings has acquired approximately 63% of AFLAC Inc., purchasing around 50.6 million shares in a transaction valued at an estimated $5.8 billion. The Japanese entity is acting as trustee of a trust holding the stake. The acquisition gives Japan Post Holdings significant influence over AFLAC's corporate governance, including board appointments and strategic direction. AFLAC's share price rose modestly by 0.8% following the disclosure, closing at $117.50. The transaction was disclosed via Form 4 filing as of 10 September 2026. With AFLAC's market capitalisation standing at approximately $9.3 billion, the stake positions Japan Post Holdings amongst the insurer's largest shareholders. The cross-border ownership structure may attract regulatory scrutiny from both US and Japanese authorities. Institutional investors are advised to monitor the trust's proxy voting behaviour and governance decisions.

Aflac shares have underperformed the broader insurance sector, rising just 1.7% over the past three months compared to a 12.4% gain for the iShares U.S. Insurance ETF. The Columbus, Georgia-based supplemental insurance provider, valued at $61.7 billion, trades 10% below its July 52-week high of $130.22. The company's recent second-quarter results disappointed investors, with adjusted earnings of $1.75 missing expectations and revenue falling 1% year-over-year to $4.1 billion. Higher benefits and claims pressured profitability at Aflac U.S., whilst operations in Japan showed signs of slowing. Analysts have grown cautious about Aflac's growth prospects, questioning whether its core businesses can deliver sufficient expansion beyond share buybacks. The stock has dipped below its 50-day moving average, suggesting weakened near-term momentum despite holding above its 200-day average for most of the past year.

Aflac's second quarter results disappointed investors despite meeting Wall Street expectations, with revenue declining 6.9% year-on-year to $4.22 billion. The insurance giant attributed the sales drop largely to difficult comparisons following last year's launch of its Miraito cancer insurance product in Japan. Chief Executive Daniel Amos said new Japanese offerings like Tsumitasu and Anshin Palette generated solid growth. US sales grew modestly, supported by group voluntary products and network dental and vision offerings. During the earnings call, analysts pressed management on several key issues. Questions focused on the sustainability of asset repositioning efforts, appetite for larger acquisitions, sequential declines in Japanese medical sales, and the impact of inflation on policy lapse rates. Amos said Aflac remains open to strategic acquisitions but will maintain discipline, favouring smaller deals that fit operationally and financially.