Filed under: After the bell , Wal-Mart (WMT) , Market matters , Ciena Corp (CIEN) , Amer Intl Group (AIG) Today could be blamed on many issues. No ECB rate cut, oil confusion, weak economic data, and more. But this is looking like wholesale de-leveraging across the board amid new credit concerns and tightening standards. Want to see what a bubble popping in commodities looks like? The sad part is that there are very few spots to hide out in, which is perhaps more symptomatic of a bear market. Here are the unofficial closing bell levels: DJIA 11,185.63 (-347.25) S&P500 1236.76 (-38.22) NASDAQ 2259.04 (-74.69) 10YR T-Note 3.643% (-0.054%) 52-week lows Top Analyst Upgrades Top Analyst Downgrades American International Group, Inc. (NYSE: AIG ) may be testing out the waters to see how Wall Street reacts. There are reports that the insurance giant may spin-off its bad assets into a new high-risk company to get the assets off its books. Shares were down 6% right before the close. Ciena Corporation (NASDAQ: CIEN ) basically met earnings but it is seeing a slowdown and order delay from Tier One telecom and data carriers. It has now lowered revenue guidance to $190 to $210 million for its fiscal fourth quarter, far under the $263 million expected by analysts. Shares are down over 10% and at new 52-week lows. Legg Mason Inc. (NYSE: LM ) was down over 10% late in the day at $42.50 after Credit Suisse took an already cautious Neutral rating do ...