When a publicly traded company files for bankruptcy, the stock continues to trade.
If there is sudden news, then the specialist on the NYSE will determine whether or not the news is worthy of causing an imbalance on the bids and asks.
If so, they will halt trading very temporarily.
Trading in the case of Lehman will not be halted because the news came out on Sunday.
LEH will trade probably in around 0.60 or so.
ALL of us who shorted LEH or were long on puts made a killing.
But if you meant that my MER short is "worthless" because trading has been stopped, then I am dumbfounded by that statement.
The NYSE doesn't open unilt 9:30AM EST. It's not trading now excpet in the European markets, where MER is up approximately 35% with BAC down approximately 17%.
I'm not sure what is confusing you, but this is so fundamental, that I am perplexed you are trying to correct me on my ACTUAL positions that I hold.