According to the company RPC.INC's website (Symbol RES), there was a three-for-two stocks split a few weeks ago. The split was effected by issuing one additional share of common stock for every two shares of common stock held. I bought 100 shares at $15 each (total value $1,500) just before the split. Just after the split, my account shows I own 200 shares at $10 each (total value of $2,000). I don't understand why the number of shares I own increased from 100 to 200 as the split is 3 for 2 and not 2 for 1. I thought my account should show 150 shares at $10 each (same total value of $1,500)? Why do I own 200 shares and not 150? I made an unrealised profit of USD 500 in the process but I don't understand why. I believe that in theory, stock splits should not create profit/loss as the increase in the number of shares should be compensated by the decrease in the price per share?