Simultaneously to his work in publishing, in 1885 Dow also served as a Partner in the NYSE brokerage house of Goodbody, Glynn and Dow where he remained until its dissolution six years later. His Partner, Robert Goodbody, was an Irish citizen and thus at that time ineligible to own a seat. By 1891, both men would part ways. Robert would start his own firm entitled Robert Goodbody & Co, which would become the fifth largest brokerage firm in the United States, before being bought by Merrill Lynch in 1971.