Romstar Inc. was a video game distribution company based in Torrance, CA that started operations in 1984. They originally started as the first American distribution arm for SNK (before SNK of America was founded in 1987). They were known for licensing arcade games from major makers for distribution. Among Romstar's clients include Taito, Capcom, SNK, Toaplan, and Seta. They also made games for Nintendo's systems. The company closed its doors in 1992.
Currently, the key personnel of Romstar, Takahito Yasuki, Ron Czerny, and Darryl Williams, later founded Atrativa Games and PlayPhone, both cellular phone entertainment companies.
Source: Wikipedia, "Romstar", available under the CC-BY-SA License.