Technology stocks gained Monday, despite being tempered by a big buyout in the digital navigation space. Shares of digital mapmaker Navteq ( NVT) fell 2%, after digital phone maker Nokia ( NOK) said it would acquire the company for $8.1 billion in cash. The deal values Navteq at $78 a share, a slight premium to its Friday closing price of $77.97. The deal comes as phone makers and wireless carriers increasingly are looking to navigation devices as add-ons to their services. Nokia gained 3 cents to $37.96, while Navteq was shedding $1.52 to $76.45. Navteq's biggest customer, digital device maker Garmin ( GRMN), was plummeting $12.17, or 10.2%, to $107.23. Garmin is a component of the Nasdaq 100, which was up 25.86 points to 2116.97. A pair of Chinese companies boosted the tech sector on licensing deals and new contracts. China Techfaith Wireless Communications ( CNTF) spiked 21.7%, after chipmaker Qualcomm ( QCOM) licensed 3G modem cards to the Chinese mobile handset maker. China Techfaith shares were rising $1.45 to $8.14. Yucheng Technologies ( YTEC), an IT consultant to the Chinese banking industry, jumped 15.7% after it said it had won three contracts worth $8.9 million. Shares were advancing $1.51 to $11.11. Teradata ( TDC) shares were up 7.3%, after the data warehousing firm completed its spinoff from IT consultant NCR ( NCR). As part of the spinoff, NCR distributed one share of Teradata stock for each NCR share owned by shareholders as of Sept. 14. NCR was losing $25.87 to $23.93, while Teradata was gaining $1.90 to $27.98. Shares of Radvision ( RVSN) were down over 17.4% after the company lowered its third-quarter revenue forecast. The company now expects revenue of $20.5 million, compared with its previous projection of $25 million. Analysts anticipated revenue of $25.1 million, according to Thomson Financial. Radvision, which makes products for videoconferencing, video telephony and the development of voice-over-Internet protocol systems, said the decline is due to lower-than-expected sales both to the federal market and through its channels. Shares were falling $3.06 to $14.50. Acxiom ( ACXM) shares plummeted 19.7%, after it reached an agreement with two private equity firms to end a previously announced $2.25 billion buyout. Silver Lake and ValueAct Partners will pay $65 million in cash to the data management company as a break-up fee. Acxiom shares were falling $3.90 to $15.89.