Hi, ballerinabeth, and welcome to BalletTalk.
It isn't clear from your post whether you are looking for a company whose performances you might want to attend or a company-affilated school. For summer intensives, you'll have to register on our sister site,
BalletTalk for Dancers. Our site caters to the interests of the audience -- the other side of the curtain

.
The dancers' site has forums for dancers of all levels, help with pointe shoes, technique, etc. It's a lot of fun. I'm sure you'll enjoy it.
Regarding the links that Cristian so nicely provided, Victor Ullate is, of course, a well-known teacher whose students include Angel Corella and Tamara Rojo. I don't think Corella (yet) has a feeder school for his company -- no mention of one on his website. Rojo was said to be trying to establish a ballet company in Spain. I don't know the status of that effort or whether it included a school.
Again, if you're looking for performance related information, this is the place. But for training, you're better off on BT4D, as we call it.