Mr. Icahn

Regulatory filings reveal that billionaire hedge-fund manager Carl Icahn bought nearly 7 million additional shares — about $67 million worth — of Yahoo.

The investor paid an average of $9.92 for each share over the course of three days, bringing his total stake to 75.6 million shares — almost 5.5% of the company, according to last week's SEC filing.

The original purchase price for his first $1.5 billion investment in Yahoo was about $25 per share, writes the International Herald-Tribune.

Icahn has been an iconic figure in the Microsoft-Yahoo seesaw of 2008, having threatened to oust Yahoo's board after the latter rejected Microsoft's $47.5 billion acquisition offer.

Following months of struggle with both a vociferous Icahn and disgruntled shareholders, co-founder Jerry Yang announced plans to step down from the CEO position. Yahoo is now actively seeking a new chief executive.

Microsoft, which tried to buy Yahoo's search business in July, reportedly renewed its offer to buy Yahoo's search business this past weekend for $20 billion.