The companies whose shares are moving in pre-market trade on Tuesday are: National Semiconductor, Nvidia, Advanced Micro Devices, Microsoft, Analog Devices, Texas Instruments, H & R Block and Pultegroup.

National Semiconductor Corp. (NYSE:NSM) shares climbed 72 percent to $24.20 in pre-market trading session after Texas Instruments (NYSE:TXN) said Monday it agreed to buy NSM for $6.5 billion, or $25 per share, a deal that combines two industry leaders in analog semiconductors, each with unique strengths in delivering products to improve performance and efficiency and convert real-world signals in electronic systems.

Analog Devices Inc. (NYSE:ADI) shares advanced 2.08 percent to $39.30 in pre-market trading session. The company stock was upgraded to “hold” rating from “sell” rating at Auriga.

Nvidia Corp. (NASDAQ:NVDA) shares gained 1.94 percent to $17.89 in pre-market trading session. The company announced that it has named Bob Worrall, a longtime Sun Microsystems executive, as its Chief Information Officer (CIO).

Advanced Micro Devices Inc. (NYSE:AMD) shares advanced 1.85 percent to $8.25 in pre-market trading session. The stock has a 52 week low of $5.53 and 52 week high of $10.24 and has $2.17 billion market capitalization.

Microsoft Corp. (NASDAQ:MSFT) shares advanced 1.25 percent to $25.87 in pre-market trading session. The weighting of MSFT will rise from 3.4 percent to 8.3 percent in Nasdaq-100 Index on May 2.

Texas Instruments Inc. (NYSE:TXN) shares declined 2.73 percent to $33.18 in pre-market trading session after the company said it agreed to buy National Semiconductor Corp. for $6.5 billion, or $25 per share, a deal that combines two industry leaders in analog semiconductors, each with unique strengths in delivering products to improve performance and efficiency and convert real-world signals in electronic systems.

H & R Block Inc. (NYSE:HRB) shares declined 2.21 percent to $17.28 in pre-market trading session. The company stock was downgraded to “hold” rating from “buy” rating at Standpoint Research.

Pultegroup Inc. (NYSE:PHM) shares declined 1.09 percent to $7.25 in pre-market trading session. The stock has a 52 week low of $6.13 and 52 week high of $13.91 and has $2.80 billion market capitalization.