Research In Motion Ltd.’s BlackBerry smartphone, which lost its No. 4 spot to Apple Inc. in the US in the first half, fell further behind the iPhone maker and market leader Samsung Electronics Co. when new models failed to attract enough users.

RIM’s share of US mobile-phone subscribers in the three months through November dropped to 6.5 percent from 7.1 percent in the previous quarter, research firm ComScore Inc. said. Samsung increased to 25.6 percent from 25.3 percent, and Apple consolidated its fourth place, gaining 1.4 percentage point to 11.2 percent.

RIM climbed 1.1 percent to $14.50 at the close of New York trading.