Hi Guys, I am learning about options and I am reading about the greeks, volatility, time decay etc etc Just to practice, I bought one contract of AAPL Sep 12 680 Call today at 10:52:06. The price (ask) was $15.35 The stock price was about $658 at the time. But almost immediately after I bought it, the option price went down sharply then it rebounded a little bit and closed at $13.60. That's about a 12% loss (not even accounting for slippage). But the stock price continued to rise throughout the day and it closed at $665. How can this be? What happened? Volatility? Time decay? Here are the current numbers: IV 24.4 Vega: 0.817 Delta: 39 In my case the stock increased in value by 7 points. Since delta is 39, that should bring the option value up by $2.8? If so, then what kind of a volatility change would have decreased the option price so much? If vega is 0.8, this must have been like a 30% hike right before I bought it? Something isn't right in my calculations. Not sure where to start, I looked at the ^VIX chart and it was $14.72 around that time but then it later went down to $14.20. Then I also looked at VXAPL... Not sure... it is the one that I should look at? The chart I am looking at is at the CBOE website and it is kind of small. I can tell that it spiked briefly then went down. And the spike was at noon. And it doesn't seem that big. Not sure if I am on track here. Is it possible to lose that much intraday just because of a change in IV despite the increase in stock price? This can't be right.