In a statement on Friday, the Selangor Menteri Besar's office said the state received foreign investments of RM3.1 billion with local investments at RM2.1 billion.
"A total of 135 projects were approved from January to June this year and this opened up 9,847 job opportunities.
"Of the 135 projects, 89 were new investments and the remaining 46, existing ones being expanded," the statement said.
According to the breakdown by sector, the electronics manufacturing industry posted the highest investments at RM1.3 billion.
Japan was the biggest investor in Selangor with 13 projects involving an investment value of RM1.136 billion, followed by South Korea at RM652 million with three projects and Singapore with RM510 million (eight projects).
Menteri Besar, Abdul Khalid Ibrahim, said the amount showed a high level of confidence among foreign and local investors towards the state government.