No way of really telling. Could be one or more institutions - brokerage firms - hedge funds - potential buyout company - Saudi Sheik/s - etc.
Market Makers follow the big money flow. If some DEEP POCKETS are trying to keep a lid on the share price, (which is to be ASSUMED), you can be 100% certain ... if these "deep pockets" are VERY deep ... MM's aren't going to be going against the "current." They work in conjunction WITH the "deep pocket/s", to maximize their profits.
I think a LOT of it are the people who bought under a penny, up to 5 cents. They locked in their profits and maybe flipped a few times. Add in some NSS and ...voila.
When the big PR comes this is going to move up very fast.