** Memory chipmaker Micron Technology's MU.O shares rise 4.8% to $352.87 premarket
** Co's director Teyin Liu bought shares worth about $7.8 million, as per a regulatory filing on Thursday
** Lui bought 11,660 shares at $337.07 apiece, 3,780 shares at $336.63 and 7,820 shares at $337.50
** On Thursday, chip stocks rallied after upbeat results from advanced AI chipmaker TSMC TSM.N
** As of last close, MU has gained 226% over the past year
(Reporting by Utkarsh Tushar Hathi)
((utkarshtushar.hathi@thomsonreuters.com))
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