From Homeless World Traveling Programmer to Funded Startup Owner
blog.streamified.com
blog.streamified.com
Maybe pedantic, but here goes: If you have given away so much as a single share, the usual phraseology is that you are "part-owner", because you own only a part. Saying "The owner" implies there is only one, which is false.
If you declare to the other shareholder that you are the owner, you might find an interesting reaction.
Good luck.