Taking stock: Here's why Vishal Sikka and Stephen Hawking's stock went up this week

A round-up of those whose worth went up or down today: Vishal Sikka (Up), Stephen Hawking (Up) and Hisao Tanaka (Down).

Vishal Sikka (Up)

The Infosys CEO has helped the company post its best revenue growth in four years.

Stephen Hawking (Up)

Hawking along with Russian entrepreneur Yuri Milner launched a $100 million hunt for alien life.

Hisao Tanaka President, Toshiba (Down)

Top executives at Toshiba, including the President, quit to take responsibility for a $1.2 billion accounting scandal.