** Lumen Technologies' shares LUMN.N fall 12.2% to $4.27 in afternoon trading

** AT&T T.N is in talks to buy LUMN's consumer fiber business in deal valuing unit in excess of $5.5 billion, Bloomberg reports

** Terms of the deal, which are not yet finalized, could change or talks might still collapse, says Bloomberg report

** LUMN CFO Chris Stansbury said at a conference earlier this month that co is not going to be a consolidator in the consumer fiber business, report says

** Including session's moves, LUMN is down ~19.8% YTD

(Reporting by Rishi Kant in Bengaluru)

((Rishi.Kant@thomsonreuters.com))