** Retail giant Walmart's WMT.O shares rise 2.7% to $117.64 premarket; co to join the Nasdaq-100 index .NDX on January 20
** Exchange operator Nasdaq said on Friday the co will replace British drugmaker AstraZeneca AZN.O in the index
** WMT will also be part of the Nasdaq-100 Equal-Weighted Index, and Nasdaq-100 Ex-Tech Sector Index
** Co raised its annual net sales and earnings forecast in November
** WMT shares have risen about 25% in the past one year
(Reporting by Utkarsh Tushar Hathi)
((utkarshtushar.hathi@thomsonreuters.com))