外がい国こく投とう資し家か

• 外がい国こく人じん投とう資し家か

  Synonymous; 外国人投資家 explicitly says 'foreign national investor', while 外国投資家 is slightly more common in economic reporting.

• 海かい外がい投とう資し家か

  Often interchangeable, but 海外投資家 emphasizes 'overseas' location, while 外国投資家 emphasizes 'foreign' nationality.

Compound of 外国 (foreign country) + 投資家 (investor).