If Aliens are revealed to exist, how would markets react?

Clarifying and Contextualizing the Question:
I'm a “put your money where your mouth is” type guy. Over the past couple of years I have been persuaded that aliens not only exist (I feel like most rational people already believe this), but that we have been visited by intelligent life. I think powerful institutions know this, and I agree with the sentiment of others that they are in the process of slowly bestowing this knowledge upon us. Furthermore, I think their timeframe for divulgence is capped: nowadays, the average person has far better equipment on them to capture an inexplicable phenomena than they did in Roswell times. This is only getting better and at some point the decision to divulge may be out of the hands of powerful institutions.
With this in mind, my personal opinion is that in the next 5-10 years aliens will be revealed to exist and have visited earth. I suspect that the news will not coincidence with any warnings of existential threat, and that governments will play ignorant (they might be anyways) as to who/what these beings are. Still, this would be be major, major news. This knowledge would fundamentally alter humanity's perception of itself and the cosmos. It would captivate the world's attention, leading to a mixture of awe, fear, and excitement… markets have been moved by less.
The Question
How would me, you, or anyone financially bet on this or a similar outcome? I'm trying to think of practical and specific options here. A little bit more thought-out than just “defense industry” or “crypto.”
I've read some opinions by people who don't think that much would change. I really just disagree with this. I truly believe this would be one of the biggest, if not most significant revelations of all time.