DALLAS -- In recent days, CEO Michael Dell has bought about $100 million worth of stock in Dell Inc., the shares of which rallied this spring but are near a five-year low.

According to a regulatory filing, Dell bought more than 4.5 million shares for $99.7 million in three separate deals from June 27 through last week.

The splurge leaves him owning more than 250 million shares directly or indirectly, close to 11 percent of the company's stock, for a total value of about $5.6 billion. That amount does not include options Dell holds on still more stock.