Why do you want to get into IB if you're happy where you are?
but let me answer your question for you ... a company that funds blah blah blah all those things you mentioned would be a private equity firm.
Whether this is PE in an investment bank or independent PE firm, etc is all possible. This could also be a VC firm but the nature of work taht VC vs PE is diff.
VC puts money into a company and doesn't involve it self in the daily runnings of it - PE firms actively manage the firm (more or less) and try to affect the firm positively.
In terms of getting into these firms, VC firm generally require some finance background and lo9ok for slightly different people than PE firms.
Big PE firms will most likely hire people from investment banks who have valuation / markets experience. Smaller "Boutique" firms will just do smaller deals and are less stringent in who tehy hire ... ( I dont' mean small as in size ... b/c several PE firms are smaller and in fact more picky)
anyhoo, im ranting b/c im tired