Key Points
- January is off to a rocky start with escalating tensions between the U.S. and Iran.Â
- CNBC used Kensho, a hedge fund analytics tool, to screen which Dow stocks hold up the best when the Dow drops 5% or more in a single month.
- Health care and consumer staples are best performing stocks during market turmoil, data shows.
- Health care giant Merck trades positive nearly a third of the time and averages a loss of 2.4%, less the half the broader market.



