Greg and Cunningham, the partnership of Thomas Greg of Belfast and Waddel Cunningham of New York, were provisions agents. Newton and Gordon were wine merchants with offices in Madeira and London. The firm was a result of two Scotsmen, Francis Newton and William Gordon, who fled to Madeira after the failed Stuart cause. Mary Spratt Provoost Alexander continued the business ventures of her late husband, Samuel Provoost, and was continually known in some circles as "Mrs. Provoost" despite her subsequent marriage to James Alexander. Their son, William Alexander (also known as Lord Stirling) served as a copartner in the family business.
From the description of Greg, Cunningham, and Company, letters to Newton and Gordon, 1774-1775, (Colonial Williamsburg Foundation). WorldCat record id: 183023293