Disclosing employment in acknowledgement of conference paper
In your particular case, your work got accepted at an IEEE conference. Congratulations.
IEEE has a relatively extensive website on author ethics. It doesn't seem to mention affiliations at all. Obviously, what you put into the paper should be correct, though.
But what is the role of putting the affiliation on the paper? After all, you speak for yourself, not your organization. It is (1) assigning credit, and (2) to make contacting you easier in case that is needed.
For none of these purposes, the asset management firm needs to be mentioned. It makes sense to declare potential conflicts of interest proactively, but as you wrote, there are none.
Many researchers do other work on the side, such as consulting, a small start-up, giving educational courses, etc. - I've not seen such a declaration of not having a conflict of interest in a (computer science) paper so far.
However, it probably makes sense to check if your main employer is fine with this (or even requires you to not mention them in the paper  - this could for instance be the case if they have no way of checking what you wrote is correct and hence don't want to risk their name being on the paper). Due to reason (2) for putting an affiliation on a paper, I believe it to be OK to put your asset management company as an affiliation on the paper if they insist.