It's equally important to do the research yourself as well so that you can make more educated decisions with your attorney. I would, at least, read your local state laws in regards to this subject.
If the investment was debt equity versus a priced round that also drasticly affects the options available.
OP please reach out to an attorney, and ask lots of questions. And make sure they understand the details of how the investment was done etc.
IANAL but there are a couple of ways this could work out in your Companies favor.