Third Point, headed by billionaire fund manager Dan Loeb, has put more money into struggling mobile device makers. According to a 13-f filing released late Friday by the Securities and Exchange Commission, the fund took a 10-million-share stake in BlackBerry Ltd during the fourth quarter, raised its stake in Nokia Corp. to 4.5 million shares from 2 million in the third quarter, and took a new 7.6-million-share position in T-Mobile US Inc. . The fund also bought 7.73 million shares of Dow Chemical and 3.3 million shares of Abbott Labs . Other additions to the fund include taking minor positions in Apple (100,00 shares) and General Motors (80,500 shares) while boosting its overall holdings in American International Group to 12.5 million from 10 million. During the quarter, Third Point sold its 3.25-million-share stake in Thermo Fisher Scientific Inc. and cut its position in Yahoo Inc. to 8 million shares from 16 million.

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