Softbank bought roughly 1/3 of Alibaba for $20 million.

A stake worth ~$63 billion today

That's the deal of the century (so far).

Also worth noting, SAIC did not own 100% of Network Solutions when it was bought from the public market by Verisign. SAIC had sold off a massive stake in the company by that point. They basically liquidated 80% of their ownership in Network Solutions for about three billion dollars over several years (at the IPO point, and then multiple secondary offerings). For example, it sold off 38% of Network Solutions for $765 million in February 1999 in a secondary offering, and then another 21% for $1.8 billion later.