I bought a stock that lost 50% of its value a week after I bought it and now has announced de listing.

just hold and wait. if you had stock in 2008-2009, you would have lost--and gained back -- way more than you lost today. but only if you held on for a year as stocks eventually regained what they lost.

You bought a "penny dreadful" a boom/bust stock. You are a gambler?
Good news your losses can offset any gains as far as tax liability goes.

Exactly why I hate stocks and bonds.