Yes, there are companies that provide this service, and they are known. They report the BTC they have on their balance.

The number you see in the charts is the amount they claim to have in stock.

The chart tells us their stock is being bought up faster than they can buy in.

If they buy in faster, they are pumping the price themselves and they defeat the purpose of their own service.

These are the early stages of a supply shortage and it's very bullish for us.