Makes up more than 50 per cent when combined with rival Samsung.
Millennial Media's September report analyses Q2 ad impressions across the top 20 mobile phones, top ten app categories, and top five tablets.
Apple was the biggest brand and accounted for 31 per cent of impressions, while the iPhone was the leading mobile device.
Meanwhile, Apple's foe Samsung was the second largest driver of impressions and generates more than 50 per cent of the total when combined with its US rival.
However, despite the success of Apple, Android accounts for 46 per cent of impressions when analysed by operating system, ahead of the 34 per for iOS, 15 per cent for BlackBerry and four per cent for Windows Phone.
The rise of smartphone ownership meant the devices accounted for three-quarters of all impressions, an eight per cent rise year-on-year.
Unsurprisingly, the iPad led the tablet market while 95 per cent of tablet impressions were made via wi-fi, suggesting users are reluctant to take out 3G/4G contracts and prefer the security of indoor use.
The full report can be accessed here – see charts below.