Both of you are wrong...
Let&#x27;s say there are 100 shares, John owns 25 and Mark owns 75. 
Stock splits 3:1, there are now 300 shares, John owns 75 and Mark owns 225.
2&#x2F;3 of 225 is 150, if Mark sold 2&#x2F;3 of that he would not retain his percentage.<p>Instead what is happening is a new class of stock will be created that is valued differently and has different voting rights.