From the post-verdict press conference:

QUESTION: Sir, is your investigation over now, now that this trial’s over? Now that you have this verdict, is this investigation — is your special counsel investigation over?
FITZGERALD: I would say this: I do not expect to file any further charges. Basically, the investigation was inactive prior to the trial. I would not expect to see any further charges filed. We’re all going back to our day jobs.
If information comes to light or new information comes to us that would warrant us taking some action, we’ll, of course, do that.
But I would not create the expectation that any of us will be doing further investigation at this point. We see the investigation as inactive.