Can a foreigner be a 100% shareholder in an Israeli JV company?

Yes. Israeli law places no nationality restrictions on foreign ownership of Israeli companies. A foreign individual or corporate entity can own 100% of an Israeli private company with no special approval required, except in a small number of regulated industries — defence, media, and telecommunications — where foreign ownership thresholds apply. For most commercial JVs in technology, manufacturing, or services, full foreign ownership is entirely permissible.