Read this interesting article today from marketwatch about the nuances in how stocks may react to today's historic health care decision.
The handicappers say the strongest chance is of the individual mandate being overturned and everything else staying the same:
"What is more likely, he says, is that justices will strike down the individual mandate requiring everyone to buy insurance, which he calculates as having a 60% to 70% chance of occurring. If only that part of the bill is struck down, it will put pressure on insurers, who still will be forced to offer coverage to everyone."
A lot of different outcomes may still happen. But I'm going to bet it won't be good for health insurers. If nothing else, changes to the law will create a cloud of uncertainty that discourages buyers.