Google's C-suite has a lot of money, and it enjoys spending it.
Since its IPO 10 years ago, Google has spent at least $23 billion buying 145 companies, according to FactSet. Of all those deals, financial analysts say three stand out as clear winners.
The first is YouTube, which Google bought in 2006 for $1.65 billion. The price tag seemed high at the time, but YouTube has grown by leaps and bounds. The digital marketing firm eMarketer says YouTube raked in $5.6 billion in gross revenue last year alone.
Another success is Android. Andy Rubin sold his company to Google in 2005, and then helped develop the mobile operating system into the global powerhouse it is today. The operating system will run on 80 percent of the smartphones sold this year, according to IDC.