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How to Trade Health Insurers Aetna, Anthem, Cigna, More After the August Flash Crash

NEW YORK (TheStreet) -- Health insurers Aetna (AET - Get Report) , Anthem (ANTM - Get Report) , Cigna (CI - Get Report) , Centene (CNC - Get Report) and UnitedHealth (UNH - Get Report) have seen long stock run-ups as they benefit from the Affordable Care Act, a.k.a. Obamacare. But those runs were hit hard by the flash crash on "Black Monday," Aug. 24. Here's how to trade the stocks in light of their recent volatility.

All five of these insurance providers set all-time intraday highs between June 22 and Aug. 18 and were consolidating solid year-to-date gains going into "Black Monday." From their closes on Friday, Aug. 21, to their flash crash lows, they suffered unjustified declines of 7.2% to 19% within the first five minutes of trading.

Here's a table of time and sales data for these health insurers for the first 10 minutes of Aug...