John Egan & Co. was a timber company founded by John Egan (1811-1857), an Irish businessman and politician who lived in Aylmer, Lower Canada. Egan's co-founders included the timber exporter Henry LeMesurier, William Henry Tilstone, and Havilland LeMesurier Routh. John Egan & Co.'s primary trade was in red pine and they constructed timber slides in Upper and Lower Canada on the Quyon, Petawawa, and Madawaska rivers. In the 1840s, the company expanded to the management of several sawmills and launched a steamer transportation system to compete with existing steamship lines. John Egan died in 1857 and a significant portion of his lumber operations were sold to John Rudolphus in 1867. John Egan & Co. was sold to James Bonfiled and Robert Turner in 1868.

John Henderson & Co. was a renowned hat, caps, and fur store in Montreal in the 19th century. Around 1834, William S. Henderson (1810-1857) set up a store in Quebec City called William Ashton & Co. In 1837, he bought out his partners' interests and in 1847, he renamed it William S. Henderson & Co. In 1852, he sold the store to his brother John Henderson (1819–1885), a Montreal businessman, and it became John Henderson & Co. The store sold luxury goods that complemented the merchandise sold in the department stores. In 1862, John brought George Richard Renfrew (1831-1897) into the partnership and the firm became Henderson, Renfrew and Company.

John Millen & Co. was a Montréal firm of wholesale automotive and industrial supplies established in 1869.