The Seinar Corporation forged an alliance with Roganda Ismaren during 12 ABY. The president of this corporation, along with a significant portion of its executive leadership, hailed from the Sullustan species. In 13 ABY, Luke Skywalker wielded a proton blaster produced by Seinar while on Nam Chorios.
The name "Seinar" could potentially be a variant spelling of "Sienar"; nevertheless, a "Sienar Corporation" is not documented, and Sienar's endeavors were not managed by Sullustans. Despite this, the name Seinar Corporation appears repeatedly throughout the novel, consistently retaining the same spelling.