HCA (HCA +0.65%) gave hospital investors a bit of a surprise today by pre-releasing second quarter results.
Those results impressed investors, sending shares skyrocketing by nearly 10%, but it wasn't just HCA that headed higher. Competitors including Tenet Healthcare (THC +0.37%) jumped too.
In the following slideshow you'll learn what was behind HCA's shocking quarter and what you might expect from here.








