I mean if you have a significant chunk of free cash sitting around there's almost no reason not to put a portion of it in 3-6 month Treasuries or something.
The return won't be much but it's better than letting the cash sit idle and evaporate due to inflation
In a competitive banking landscape the bank would do it for you, then just give you a competitive interest rate on your account. Is that not present in the US?
The question is why you'd use money you raised for anything but the reason you raised it. You've probably raised a shit ton more than I have, but hear me out - when one raises, there's generally a timeline of fund deployment from the startup's UoF, right? That's how it was done in my case - we tell the investor what we need, why we need it, and when we need it, etc. And then if the investor agrees to invest, it's not just a lump sum sitting in the bank - a good amount of that money gets deployed to help the startup fulfill its mission.
I get that if you're running super lean and you've raised enough to run lean for a while and use cash when you need to, but at the same time why raise more than you have need for?
I've seen VC's who care a lot about understanding how their companies are going to spend the money. And other VC's who don't even ask the question, or accept generalities like "hiring, scaling" with equally loose timelines.
Depends on the funding vehicle. If you're on a SAFE, and still a going concern, then I think returning investor funds would trigger a priced round and you'd end up converting at a (hopefully) high valuation