These tech industries are pretty large, but are well down in the corporate rankngs.
To digress further-
Apple in number 75, although it has a market value of $190 billion.

The largest in market value is Petrochina, $334 billion, although it ranks number 12 on the list.
In order of market value, if you are thinking of buying a corporation-

PetroChina
ExxonMobil
ICBC (China, banking)
Wal-Mart
China Mobile
Petrobras (Brazil) and Berkshire Hathaway, tied

Forbes rank-
JPMorganChase
General Electric
Bank of America
ExxonMobil
ICBC
Santander (Spain)
Wells Fargo
HSBC (UK)
Royal Dutch Shell
BP

(Above rankings all from Forbes)