HTC mainly does Android, but does Windows Phone too (which IMHO is like iphone with an inferior app store but better UI).
HTC keeps churning out devices at a prodigious rate. Even if some are shipped but not sold (and eventually returned), it is a very very respectable number. Their growth figures are astounding.
So.. Even if the numbers are inflated by some percent, it is definite that its marketshare is going up. And that's in a wildly growing market.