There are only so many times you can cheat the reaper.

In the case of embattled Unix vendor SCO, it appears as though time has run out for its life as a publicly listed company on the NASDAQ stock exchange.

Effective the open of business today, NASDAQ has delisted SCO's publicly traded stock, which had traded under the symbol SCOX. At the close of business yesterday, shares of SCOX traded at a closing price of $0.18. During the last 52 weeks, shares of SCOX had ranged from $0.15 to $2.21. At the close of market yesterday, the stock had nearly 21.5 million shares outstanding.