most often( and not that often) a company will get a "no action" letter which states that the sec is not going to persue further enforcement action at this time.
But I would note that it generally takes many many years to get to that point and usually a company has to fight to get the SEC to state that an investigation is complete and nothing was found.
Usually the best they can get is a No Action letter. That only means the SEC won't bring a further enforcement action. It's not really an exoneration.