The address in question has been subject to much speculation not least because one transaction with a very small amount of bitcoin was linked to the former bitcoin drug bazar, Silkroad.
The address, moreover, appears to have begun its life around June 2011, a time when an MT Gox hack led to a flash crash of bitcoin’s price. Some therefore speculate these might be Gox’s or Jed McCaleb’s, the previous owner of Mt Gox. Both deny.
The name of the address is by itself very interesting. It looks like a vanity address, although it could be quite a coincidence, because it starts with 1933.
In 1933, the then US President Franklin Roosevelt made an executive order confiscating gold. Satoshi Nakamoto referred to that event by self-declaring his birthday as April 5th 1975, the day when the above order came to an end.
This could, therefore, be Nakamoto himself, although it could well be someone else trying to deflect attention, pretending it is him or as stated the fact the address starts with 1933 could be a complete coincidence or of course it could be some other bitcoiner that wanted to refer to that event.
In short, we have no clue, but what we do know is that this 1933 address moved all of its funds on the 9th of March 2014, around the time MT Gox declared bankruptcy and “found” 200,000 btc which was then moved in March 2014.
Since March 2014, the address has been breaking its coins into smaller and smaller pieces with some of them recently ending up on exchanges.