Adding to a

string of recent insider sales at

Dell

(DELL) - Get Report

, CEO Michael Dell reported today that he and his wife sold 2 million shares on March 21.

With shares priced at $28.35 each, the sale was worth $56.7 million. Though Dell reported the sale in a filing with the

Securities and Exchange Commission

, the shares had been held by his wife.

Dell himself has recently sold off two lots of 10 million shares, one in November and one this month. Including today's sale, he and his wife have sold 22 million shares of the company's stock over the past four months.

But he continues to own 288 million shares directly, 31 million shares indirectly through his wife, and 8 million shares through a limited partnership.

Dell stock has popped up 23% since its near-term low of $22.86 on Feb. 10. On Tuesday, shares of the company closed at $28.13, up 32 cents or 1.2%.