There's big news for Guardant Health (NASDAQ: GH) shareholders today -- but disappointing news also. This morning, analysts at investment bank Craig-Hallum announced a switch in their bets on cancer-screening biopsy companies, downgrading shares of Exact Sciences (NASDAQ: EXAS) from buy to hold -- and replacing them with a bet on Guardant Health -- initiated at buy.

Responding to the news, investors are selling off Exact Sciences stock by 6.5% today, as of 10:45 a.m. But here's the bad news: they're selling Guardant Health too -- it's down 5.5%.

So what's up with that?

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Source Fool.com