Binance is an international exchange cofounded by Onchain CEO/ AntShares Founder Da Hongfei and is a key investor/advisor for Binance ANS dev team. If you hold on Binance they pay you Gas. Everyday they check your ANS balance and at the end of the month pay your GAS dividend. Its fasted exchange out here. I bought some BNB as well because it cuts your trading fee by 50% if you use it to fund your trades. Its new but the principle founder has started multiple successful exchanges. Bottom line is that there are 2 exchanges trading NEO.