Grantham and his team warned of the dangers of the 1990s tech bubble years before it burst, and warned of the consequences of the 2000s housing bubble long before anyone else took it seriously.
In the past year, the combined net profit of Microsoft, Google, eBay, Yahoo, Facebook and Amazon was $7 billion less than Apple's.
The company's software helps balance supply and demand in a power grid by adjusting power use during peak demand periods.