zhè / jiā / gōng / sī / pìn / qǐng / yì / jiā / dà / xíng / zhèng / quàn / gōng / sī / dān / rèn / zhǔ / chéng / xiāo / shāng这家公司聘请一家大型证券公司担任主承销商。The company hired a large securities firm to act as the lead underwriter.