TPG provides a range of communication services to residential users, small and medium enterprises, government, large corporate enterprises and wholesale customers.
2degrees has a significant network in New Zealand and has taken some market share off the two big companies - Spark and Vodafone - in the residential space.
It's not the first time speculation of a takeover of 2degrees has arisen.
At the company's results briefing mid-year, chief executive Stewart Sheriff headed off any questions on the issue.
"You can read anything you want about [various companies] going to buy us, we won't be commenting on that - that is something the shareholders deal with," he said then.
Australian-listed telcos TPG, Vocus and M2 have been suggested as potential suitors for 2degrees.
2degrees reported a narrower loss for the 2015 year in a period that saw it expand to a full-service provider after it acquired Snap internet for an undisclosed sum in March last year, and invested heavily in network expansion.
The company posted a $33.1 million loss for the year, 6 per cent better than the previous year, and earnings before interest, tax, depreciation and amortisation of $78.5 million, up from $54 million the year before. Revenue lifted 43.1 per cent to $569.1 million.
Sheriff said at the time that 2015 had been focused on growing revenue market share, capability and building a platform for the company to grow from.