i'm 26 looking for a men's cologne
i work in stocks and investing
i need something that will represent power, rich, (can also be unique and with passion).
can also be royal or fashion
It might depend on the impression you want to give. If you want to be butch, aggressive, eg a trader, you could try masculine leathers, like Knize Ten (a classic) or Dior Leather oud (more animalic). If you want to give an impression of refinement and be schmoozy (like in marketing), you could check warmer, enveloping things based on ambers or incense, like Etat libre d'orange Je suis un homme or Guerlain Derby.
If you are a junior (as your age implies) I would advise for a less agressiv scent. Something that does neither imply "power" nor "rich" because both are the result of experience and a good job over a significant period of time. You can get away with this in your mid thirties but not at the beginning of your career.
I am working in finance myself and I have seen my share of ambitious young people coming straight from university. Usually it takes some years in the business until they start realising that real life is quite different from what they have been tought at university.