If you have a minimum of notions in investing, you know that a split has absolutely no plus-value. You now have more shares but the split dilutes the earnings among a bigger number of shares.
So, why did the stock went up?
With the stock market, we can’t be absolutely sure about what everybody thinks. But I have two theories that are highly possible:
1- Some people think that the stock is much cheaper now. Some websites haven’t adjusted yet so people may believe that the PE ratio is now very low.
2- Some people believe that many investors are stupid and will buy the stock for the reason above. So they buy the stock now.
I don’t remember a time when a split had a negative effect on some stock. It doesn’t always have a positive effect but it’s usually either positive or neutral.
And the more positive it is, the most we should be worried about the intelligence of investors.