Ok let me begin by saying I'm embarrassed by having to ask about this. I'm new to trading but have been doing reasonably well so far. i bought shares in a few companies and thought i was doing well. However, today i checked my commsec account and seen that options i bought in a company which i already held ordinary shares in have been reduced to zero in my account making it a 100% loss. The options were available until the 15th of this month. can someone be so kind as to explain to me what has happened?