Billion-Dollar Health Startups

The WSJ’s Billion Dollar Startup Club has identified 73 private companies that have been valued at $1 billion or more by venture capitalists. Here are profiles of two members of the club. Explore the full list at wsj.com/billionclub.

Latest valuation: $1.1 billion

Total equity funding: $354 million

Location: Redwood City, Calif.

Founded: 2001

CEO: Andrew Thompson

In the future, tiny computer chips no bigger than grains of sand will be embedded in prescription pills that inform doctors when patients have taken their medications.

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