Billionaires and TPG Telecom founders David and Vicky Teoh could be forgiven for keeping an eye on another of their telco investments in the past year.

The Financial Review Rich List duo derive most of their wealth from their stakes in TPG, which started as Total Peripherals Group after the Teoh family moved to Australia in 1986 from Malaysia and listed on the ASX in 2008 via a reverse takeover of SP Telemedia.