Date: Dec. 8, 2005

Acquired for: $1.75 Billion

Many saw Lenovo’s bid for IBM's PC business as a dangerous gamble, especially since it was struggling to compete in the US market with its premium Think-branded computers. Looks like the joke was on naysayers, as the company managed to boost its revenue from $3 billion to $15 billion in just three years, while playing trendsetter with its updated line of high-end and sturdy notebooks. Seeing how Lenovo recently dethroned HP as the top global PC manufacturer, it's safe to say the merger was a success.