In the latest results, 2GB slumped to a 10.8 per cent market share, down 0.4 percentage points from the previous survey in September. Lachlan Murdoch's Smooth FM, which also fell 0.3 percentage points, holds a 13.2 per cent share, slightly increasing its lead over the AM station.
In the closely watched Sydney breakfast slot, 2GB's Ben Fordham remains in the lead with a 13.9 per cent share, though this was down 0.9 per cent. Smooth FM's breakfast offering recorded an 11.8 per cent share, a drop of 0.4 per cent.
In the morning slot, Smooth FM's Ty Frost has overtaken 2GB's Mark Levy, with both stations now on a 14.2 per cent share, reflecting further losses for 2GB.
However, in Melbourne, 3AW's Russel Howcroft and Ross Stevenson continue to dominate with an 18.3 per cent market share. While the duo dropped 1.2 percentage points, they remain well ahead of Gold's 10.5 per cent share, which fell 0.5 per cent.
The results come after pokies and pubs mogul Arthur Laundy and his family bought 2GB along with a suite of talkback stations, including 3AW, from Nine for $56 million earlier this year, creating the new radio business Tapt Media.