Keeping Old 401k vs. rolling over to Rollover IRA

I would like to rollover my old 401k into an Rollover IRA so I can get it out from under the control of my former employer's plan. However, I like all the investments I currently have and I'm making good money on them. (Note, can invest in individual stocks in my old plan, which is where 90% of the money is invested).

So I guess I can just sell all my positions and then rebuy them once the money hits my rollover? I would just miss out on any gains (or losses) that happen in the gap? Is that right? Or should I just keep the money where it is? Trying to figure out the best way to handle this.