Graph distribution on Bittrex is for Bittrex accounts ONLY. It shows the higest holding accounts on the exchange, and it has the lowest supply on exchange I have ever seen. Meaning that almost all coins are staking 
If the guy asking above here reffered to the richlist in block explorer. It can be difficult to know witch one is exchanges. But a clear indicator is if the address receives stake rewards.
If the guy asking above here reffered to the richlist in block explorer. It can be difficult to know witch one is exchanges. But a clear indicator is if the address receives stake rewards.
Yes. That's the problem. Somehow resolution of https://explorer.graphcoin.co/ works only intermittently for me and usually goes to the web wallet. I did click on the rich list when the explorer popped up once, but I got a 404. It looks like the server is ngix.