Aflac sells supplemental insurance, which is a second layer of coverage that pays cash directly to policyholders when they get sick or hurt, on top of whatever primary health insurance they already have. The company operates in two places: the United States, where it sells accident, cancer, hospital, disability, dental, vision, and life policies mostly through employers, and Japan, where it is the largest provider of cancer and medical supplemental insurance by policies in force. Policyholders pay a fixed premium every month, and Aflac collects that stream of recurring payments whether or not anyone files a claim. That steady premium income, combined with returns from a large investment portfolio, is how the company makes its money. The diagram below traces where the money goes.
How Aflac Makes Money
flowchart TD
A["Customers in Japan & U.S."] --> B["Insurance Premiums
17.2B/year"]
B --> C["Claims Paid to Policyholders"]
B --> D["Investment Portfolio
Bonds, Stocks"]
D --> E["Investment Income
& Interest"]
E --> F["Operating Cash Flow
2.6B/year"]
C --> G["Policyholder Retention
& Renewals"]
G --> A
F --> H["Reinvest in Distribution
& Product Development"]
H --> I["Sales Force & Distribution
Channels Japan & U.S."]
I --> A
F --> J["Shareholder Returns
& Capital"]
J --> H
Five years of financial data tell a story of gradual compression. Revenue peaked at $21.6 billion in 2021 and has declined every year since, reaching $17.2 billion in 2025. Some of that decline reflects the movement of investment gains and losses through the income statement rather than deterioration in the core insurance business. Adjusted earnings, which strip out those investment swings, were $4.0 billion in 2025 compared with $4.1 billion in 2024, a much smaller drop. But the cash generation trend is harder to explain away. Operating cash flow fell from $5.1 billion in 2021 to $2.6 billion in 2025, cut nearly in half over four years.
Operating Cash Flow, 2021 to 2025 ($ billions)
Operating cash flow has declined steadily across the five-year period, from $5.1 billion in 2021 to $2.6 billion in 2025.
Despite the cash flow compression, the balance sheet carries more cash than debt. Net debt was negative $6.2 billion at the end of both 2024 and 2025, meaning the company held more cash and liquid assets than it owed in debt. The company also repurchased $3.5 billion of its own shares in 2025 and raised its quarterly dividend by 5.2% for 2026, signalling that management believes the business generates enough cash to return capital to shareholders even as operating cash flow has declined.
$6.2B
Net cash position at end of 2025 (more cash than debt)
What is Japan's 'third sector' insurance?
Japan divides insurance into three categories. The first sector covers life insurance. The second sector covers property and casualty. The third sector covers everything in between, mainly supplemental health products like cancer and medical insurance. Aflac Japan dominates this third sector, which is less sensitive to interest rate changes than life insurance and tends to have more stable profit margins.
Japan is the engine of this business. It contributed 53 percent of total revenue and held 76 percent of total assets according to the company's own risk disclosures. That concentration creates a specific kind of vulnerability. Japan's aging population and rising out-of-pocket healthcare costs are genuinely good for demand. But everything that flows back to the United States in reported dollars depends on the exchange rate between the Japanese yen and the U.S. dollar. When the yen weakens, Aflac reports fewer dollars even if the underlying Japanese business is unchanged. The average yen-to-dollar exchange rate in 2025 was 149.32, compared with 150.97 in 2024. That slight yen strengthening added a few cents to per-share earnings, but multi-year yen weakness remains a persistent headwind.
53%
Japan share of revenue
76%
Japan share of total assets
Japan's outsized share of assets relative to revenue reflects the scale of Aflac Japan's investment portfolio, which must match its long-duration insurance liabilities.
Beyond currency risk, the investment portfolio itself carries meaningful exposure. Aflac Japan holds large quantities of Japanese Government Bonds and has significant positions in commercial real estate and highly leveraged companies. If interest rates stay high or the economy slows, those positions could lose value or stop paying. Interest rate risk cuts both ways for an insurance company. If rates drop sharply, Aflac may not earn enough on its investments to cover what it promised policyholders when those policies were priced. The company's own risk disclosures rate both of these as high-severity threats.
2025
crisis
Cyberattack exposes 22.65 million people
In June 2025, attackers gained unauthorized access to Aflac's U.S. systems and stole personal information including health data, social security numbers, and claims records belonging to approximately 22.65 million customers, employees, agents, and other individuals. The company contained the breach within hours and says claims processing continued normally. The full financial cost, including potential lawsuits, regulatory fines, and elevated insurance premiums, had not been determined as of the filing date.
The cyberattack adds a layer of uncertainty that is genuinely hard to price. The company says it does not believe the incident will have a material impact on its finances, but it also acknowledges that ongoing legal proceedings, regulatory investigations, and the cost of monitoring services for 22.65 million affected individuals could produce costs that are not yet fully known. Reputation damage in a business where trust is the entire product is also difficult to quantify in the short term.
22.65M
Individuals whose personal data was involved in the June 2025 cyberattack
What does 'mature market' mean for an insurer?
A mature market is one where most potential customers already have the product or have decided they do not want it. Growth in a mature market usually comes from taking customers away from competitors, persuading existing customers to upgrade, or finding entirely new distribution channels. Aflac operates in mature supplemental insurance markets in both the U.S. and Japan, which is why distribution partnerships with banks, Japan Post, and Dai-ichi Life matter so much.
Aflac is actively trying to grow its way into adjacent opportunities. In Japan, it launched Tsumitasu in June 2024, a savings and nursing care product aimed at retirement preparation, and followed that with two new products in 2025: Miraito, a flexible cancer insurance product, and Anshin Palette, a customizable medical insurance product. In the U.S., the company is pushing beyond worksite sales into direct digital channels to reach consumers who do not encounter Aflac through an employer. These moves suggest the company sees limits to organic growth in its traditional channels and is looking for new entry points.
Aflac Japan distributes cancer products through roughly 20,000 Japan Post outlets and approximately 37,000 Dai-ichi Life representatives. That reach into everyday Japanese life, post offices and life insurance agents, is a distribution advantage that takes decades to build and would be very difficult for a new entrant to replicate quickly.
The Bet
Aflac's financial logic holds together only if Japan remains both stable and structurally favorable. The bet is that Japan's aging population keeps demand for cancer, medical, and nursing care insurance rising, that the Japanese government's finances stay sound enough that Japanese Government Bond holdings retain their value, and that the yen does not weaken materially further against the dollar. If any of these three conditions deteriorates simultaneously, the segment that generates 53 percent of revenue and holds 76 percent of assets becomes a source of compounding problems rather than compounding cash flows. New products like Tsumitasu and Miraito are designed to extend relevance, but they are early-stage and cannot quickly replace the premium income from the existing book of business if that book shrinks.
Open question
Aflac is a business with a genuinely dominant position in Japan's supplemental insurance market, a strong brand in the U.S., more cash than debt, and a long record of paying and raising dividends. At the same time, operating cash flow has been cut nearly in half over five years, more than 22 million people had their personal data stolen in 2025, and more than three quarters of the company's assets sit in a single foreign country whose currency and government bond market are outside management's control. Is the steady premium income and distribution moat in Japan durable enough to offset a decade of potential headwinds from currency weakness, interest rate sensitivity, cyber liability, and a maturing customer base, or has the easy growth already happened?
Compiled · 10-K · FY2025
