Why did my call lose money when the stock went up?
Green stock, red call? You are not crazy, and it is not a glitch. A call’s price is not driven by the stock alone. Two other forces, time decay and a drop in implied volatility, can bleed value faster than a small move up adds it. Rise a little, rise slowly, or move exactly as expected, and your call can still finish red.
Here is the reframe that fixes it: this is deterministic. You own three moving parts, not one, and you can know all three before you buy.
One, direction (delta). If your call has a delta of 0.30, a 1 dollar move in the stock only adds about 30 cents to the option. You capture a fraction of the move, not all of it.
Two, time (theta). Every day that passes, the option loses a little value simply because there is less time for your thesis to play out. A slow grind higher gets eaten alive by the calendar.
Three, and the one that ambushes stock traders the most, implied volatility. Buy when expectations are high, say before an event, and when those expectations deflate, the drop in volatility can outweigh a small gain from the stock going your way.
So a green stock and a red call is not a mystery. Delta gave you a little, theta and a volatility drop took more. Weigh all three before you click buy and it stops surprising you.