Chalk it up to what you will, but only Apple and HTC managed to gain browser market share out of the top 5 mobile OEMs in comScore’s latest report. While the numbers are US-only, they’re indicative of results that we’re likely to see from the rest of the world.

As far as the numbers are concerned, OEM browser share worked out like this:

Apple saw a 2.3% gain, while HTC managed to eek out 0.4%. Samsung stayed even month to month, while LG and Motorla saw losses of 1.1% and 0.9% respectively. The study is a measure of 234 million Americans aged 13 and over. Samsung still holds the lion’s share of the OEM market, with 25.6%, LG tails at 19.4% while Apple took the #3 position at 13.5% in February.

As for the platforms overall? It’s about what you’d expect. Android and iOS both gained, at 3.2% and 1.5% respectively, while RIM dropped 3.2%, Microsoft lost 1.3% and Symbian was flat.

As the mobile market increases, there were predictable gains to the activities in which smartphone owners are engaging:

What will be interesting to see is the numbers game for April, as Microsoft and Nokia are expected to make a splash with the upcoming Lumia 900 handset. Priced at a mere $99 on contract (or $449 without), it should help Microsoft regain some of that lost market share from the previous months, as long as potential buyers aren’t scared off by a lack of available apps. We’ll have to wait and see, as it will likely be May or June before we get the April figures in hand.