Online retailer giant Amazon is quickly becoming a device heavyweight.
Amazon's Kindle Fire grabbed a 54.5 percent share in February, almost doubling its share in the past two months and "already establishing itself as the leading Android tablet by a wide margin," according to ComScore (see chart below).
ComScore said its methodology "measures unique devices accessing the Web during the time period noted, including home, enterprise and secondary devices across all age groups."
Samsung's Galaxy Tab was a distant runner-up with a 15.4 percent share in February, followed by the Motorola Xoom with 7.0 percent share. The Asus Transformer and Toshiba AT100 were also in the top five with 6.3 percent and 5.7 percent market share, respectively.
Amazon's tablet sports a 7-inch screen and is priced at only $199 -- undoubtedly one reason for its popularity.
Though analyst reports have varied, IDC says Amazon shipped just shy of 5 million units in the fourth quarter of last year. More recent figures are not available yet. Amazon does not publish shipment numbers.
The iPad is still the undisputed tablet leader overall. Apple said this week that it sold 11.8 million iPads in the second quarter.
"For the purposes of this study, Nook was classified as an e-reader and not a tablet," a ComScore spokeswoman said, referring to Barnes & Noble Nook Tablet.