Questions to Solborn Investments this week went unanswered. It is understood Solborn paid $6m for its stake, suggesting Crimson is valued at around $280m.
Beaton said Crimson had worked on expanding into Asia in the past few years and now China was the company largest market outside of Australasia, with Korea close behind.
"The speed with which we've been able to build brand in [Korea] has given us a lot of focus," Beaton said, adding 40 per cent of his company's clients had Asian heritage.
He said Solborn's involvement will "help us further deepen our penetration" into Korea.
The move still leaves the young founders with the largest stake in the company with (Beaton with 34 and Kushor with 10 per cent), with the remainder of stockholders being billionaires solicited by Beaton (New York's Robertson and Chase Coleman with 19 and 5 per cent respectively), and smaller local investor typified by the 8.25 per cent stake raised during a 2014 stint at Auckland University's Icehouse.
While the firm has gained considerable positive press for the precociousness of its founders, the rise from Auckland tutoring business to a firm with global ambitions hasn't been entirely smooth sailing.
The company began growing from New Zealand by using an initial $30m war chest raised from Robertson to roll up a handful of smaller operators. Some of these deals turned fractious, and in 2018 the company lost a long-running fight in the High Court in Auckland to keep secrets details of its dispute with 2015 takeover target Dunedin's UniTutors.
The wider college-admission sector has also recently come in for scrutiny, with the FBI earlier this year busting a $30m conspiracy that involved well-off parents - including wealthy Chinese and actress Felicity Huffman - paying six-figure sums to fraudulently secure prestigious university placements for their children.