shares of sirius xm holdings inc siri pulled back 9 in premarket trades friday after skyrocketing thursday the stock ended thursday’s session up 423 after multiple halts for volatility on trading volume of almost 128 million shares well above its 30day average of about 214 million shares sirius xm’s stock has risen recently apparently as a result of short covering and potentially buying linked to rebalancing of the nasdaq 100 index in a note released friday benchmark increased its price target to 7 from 6 and maintained its buy rating for sirius xm citing the impact of owner liberty media corp’s lsxma lsxmb fwona fwonk splitoff of the mlb atlanta braves team parent atlanta braves holding inc batra batrk  “despite the likely immediate siriusxm stock price retreat we do regard the business as fundamentally attractive with the likelihood of a transaction with liberty somewhat amplified by the braves splitoff and august 3rd tracking stock reclassification and the creation of the new liberty live tracking stock” wrote benchmark analyst matthew harrigan sirius xm’s stock has risen 1034 in the last three months outpacing the sp 500 index’s spx gain of 98