Whole life dividends come from mutual companies, and that isn't a coincidence. It falls out of who owns the company.
A mutual insurer has no shareholders. The policyholders own it. The premium is priced on careful assumptions about deaths, expenses, and investment returns. When the real numbers beat those assumptions, the surplus goes back to the owners. The owners are the people holding participating policies. That return is the dividend.
A stock insurer is owned by shareholders who bought stock. Profit goes to them. A stock company can still sell whole life and can still pay something it calls a dividend. And the surplus has two claimants instead of one, with quarterly earnings expectations sitting on management in a way they don't at a mutual.
The practical difference shows up in time horizon. Mutual carriers make decisions on a fifty-year clock because their obligations run that long and nobody's asking about next quarter. Several of the large mutuals have paid a dividend every year for more than 150 years, through the Depression and two world wars. That record is the argument for the structure.
Demutualization is the thing to know about. A mutual can convert to stock ownership. When it does, policyholders usually get stock or cash in trade for what they owned. Several large insurers did this in the late 1990s and early 2000s. If you're buying a participating policy for a fifty-year dividend, the structure you're buying into isn't permanent.
It doesn't make mutual automatically better. Stock companies dominate indexed universal life and term, and they're often priced better. A well-run stock carrier with strong capital is a fine place for a death benefit. The structure tells you where the incentives point, not who wins.
Some companies sit in between. A mutual holding company owns a stock insurance subsidiary. That setup lets the group raise outside money while policyholders still own the top of it. If you're comparing carriers on structure, find out which of the three you're looking at before you weigh it.