The fact that these coins are some of the first mined and have never moved lead many to believe the wallet could be owned by the creator of bitcoin, Satoshi Nakamoto.
It is likely not a Satoshi account, as explained by Nic Carter:
The mined block is not a Patoshi block. A Patoshi block is one that was mined by the most prolific early miner who inadvertently left a mark that can be extracted using some clever analysis. Most analysts assume Patoshi is Satoshi, which I think is likely. The just spent coinbase was from a non-Patoshi block.
I personally don't believe it was him, even before you presented this data, simply because he could have moved it any other time and didn't, and why ONLY 40 BTC if he access to all of it?