... rate as they approach expiration. The at -the- money options, the 380s, have the most increase in theta because they contain the most time premium. Those nearest the money, the 360s and the 400s, ... 1 point decrease in the underlying, the combined delta decreases by 0.026: the put increases its delta by 0.013, and the call decreases its delta by 0.013. In other words, as the underlying ... decay and therefore has negative theta.Tables 6.3 and 6.4 are similar to the previous Tables 6.1 and 6.2, but they include the daily theta numbers for all the contracts listed. Here, the theta...