PortfolioPlus.
AOG used to be called FKP and I have been holding/trading it since 2007, its story is a very complicated one from old days, you can still search it in google, it was once heavily shorted for more than 2 years from 2007 to 2009 ( a single 40 millions sell order crashed the sp in 2018).
As to the value... FKP has always claimed it is deeply undervalued with discount to its "book value", those claims made me jumped into it and believe it will one day trade at 2X book values. However it never happened.
It seems associates with the colourful background of family of the largest SH and chairman SH Lee, but I can't support my theory without evidence.
Anyway, if a "value" has been there for more than 10 years but still no one come to pick it up, you should ask yourself a question why.