i don't know but he could always use the net proceeds to buy back more shares of dell if that was the case and he thought it was a good investment at this time which would also show up as insider trading and dosn't. Also he is not the only one selling and there are no insiders buying. Just the pions.
On the next down day. It could't move more than an 1/8 on a big day. Most analysts that came out with positive reports projected lower earnings because of the increase in dram prices. Increased costs ='s lower profits ='s lower stock price.