(Bloomberg) — A snapshot of Obamacare enrollment in seven states suggests the law hasn’t significantly increased competition in health insurance markets, the Kaiser Family Foundation reported. Meanwhile, the Department of Health and Human Services said Monday that enrollment has reached 5 million as the March 31 deadline is just two weeks away.

In California, for example, four big insurers have largely carved up the state’s market. The divide is more equitable than before the Affordable Care Act as California’s insurance market is now “moderately concentrated” instead of “highly concentrated,” according to a measure of market share called the Herfindahl-Hirschman Index, said researchers at Kaiser, a Menlo Park, California-based nonprofit that focuses on health care.

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