I bought a LEAP a few weeks ago. Its value swings wildly on my broker's webpage (my broker is my bank; maybe they don't have the best interface.) However the price on the options chain (from NASDAQ) changed little at first, and has remained solid for several days. The 'last' price on the options chain may indicate that I was the last one to buy this option! How can the options chain value of the option remain the same, but my broker price seemingly fall hundreds of dollars per day?
And can anyone recommend a good site to check the current value of an option, though the chain doesn't change? Or is the chain always completely definitive?