The NASDAQ (National Association of Securities Dealers Automated Quotations) is an American stock exchange. The NASDAQ Exchange is the largest electronic screen-based equity securities trading market in the United States. The NASDAQ was founded in 1971 by the National Association of Securities Dealers (NASD). Now , Nasdaq-OMX, controls and operates the NASDAQ stock exchange hat became the second largest exchange in the United States. Nasdaq-OMX also operates eight stock exchanges in Europe and holds one-third of the Dubai Stock Exchange. The NASDAQ has a pre-market session from 07:00am to 09:30am EST, a normal trading session from 09:30am to 04:00pm EST and a post-market session from 04:00pm to 08:00pm EST.
Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.