Alaska Air Group Inc. is slated to replace SanDisk Corp. in the S&P 500 index after the close of trading on Thursday, according to S&P Dow Jones Indices.

Memory-chip maker SanDisk is being bought by Western Digital Corp., the largest maker of computer disk drives, in a $19 billion deal that is expected to close Thursday.

Seattle-based Alaska Air, the parent of Alaska Airlines, is the sixth-largest U.S. airline by traffic. It reached a $2.6 billion deal to buy Virgin America Inc., a deal that if approved by Virgin shareholders and regulators would place it as the fifth largest, ahead of JetBlue Airways Corp.

Shares of companies that join the S&P 500 often rise as portfolio managers who track the index buy shares.

Meanwhile, Texas Roadhouse Inc. is to replace Alaska Air in the S&P MidCap 400 and Cavco Industries Inc. to take Texas Roadhouse's spot in the S&P SmallCap 600.

Alaska Air's shares rose 1% to $70 in after-hours trading while Texas Roadhouse's rose 2% to $46.05 and Cavco Industries' rose 7% to $94.97.

Write to Maria Armental at maria.armental@wsj.com

 

(END) Dow Jones Newswires

May 10, 2016 19:25 ET (23:25 GMT)

Copyright (c) 2016 Dow Jones & Company, Inc.
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