So far in 2012, Universal's US market share lead has dropped to 1.2% sitting at 30.4% next to Sony's 29.2%.
Last year, Sony was 2.8% behind Universal in terms of US market share and the pair were separated by a 5.2% difference in 2010.
Sony dominates Billboard's Top 3 this week, with Adele's 21 and Carrie Underwood's Blown Away sitting behind Lambert's No.1.
The company also lays claim to previous chart toppers including One Direction's Up All Night, Jack White's ...
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