Much of the penny swing is just the bid - ask spread.Especially if rounded. to nearest full cent.
Let me repeat, I am not talking about core holdings. But I'm tired of watching the daily swing.
Of course brokerages run the price of thinly traded issues up and down. They can't make enough of a 1 penny spread. Remember eigths and quarter point spreads.
Participate, and you will not only boost volume, but that will tend to narrow the spread. All good.
If you make a few hundred dollars, so much the better. You earned it.