The figures were released by the Ministry of Planning and Investment's Foreign Investment Agency (FIA).
In September alone, FDI businesses poured more than $1 billion into the country, the FIA reported.
The processing and manufacturing industries took the lead in terms of newly and additionally registered FDI capital of $6.24 billion, accounting for 65.5 percent of the total FDI.
Real estate ranked second, attracting $2 billion with eight projects.
The retail and communications sectors came in the third with a total of $400 million.
Japan remains the country's leading source of foreign investment, recording a total registered capital of $4.7 billion. Samoa and the Republic of Korea ranked second and third respectively.
Nine-month FDI disbursement hit nearly $8.1 million, including $820 million in September alone.