Ferdinand Theriot held his seat at the NYSE and his partnership at L. von Hoffman from 1898 to 1902 and perhaps beyond. He's also the gentleman in the upper left photo below.
Hollister was a full partner at Vermilye and held a seat at the NYSE for the full span of the 1898 tax period.
The stock sale memo prompts a question. When were the dark green dollar values first issued and/or used? Above we have an example of February 18, 1902; Elliot Perry reported that the stamps went on sale in January 1902. I'm interested in examples of January uses of the stamps if they can be found.
Louis A. Sussdorf, drawn to show his associations with the telegraph business and the Pennsylvania Railroad. Both Sussdorf brothers were members of the NYSE through the 1898 tax period; they maintained their partnership for all four years as well.
William H. Sussdorf was on the executive committee of the Long Island Philatelic Society of Brooklyn and has a record of lecturing on philately.
Millard F. Polhemus, above, held a seat at the New York Stock Exchange throughout the 1898 tax period as well as conducting business at the exchange as an affiliate of Strong, Sturgis & Company.
John McCullough acquired his seat at the New York Stock Exchange in 1900 or early 01, and traded through a partnership with his own name. He must have specialized in copper investments. Again, why did stock tickers often have glass bells over them as the caricaturist drew?
Mr. Bass must have liked shooting sports as well as his dog, who rather bizarrely pops out of this "caricature". Rolston & Bass shuttered operations when Walter left the partnership in January 1901. He moved to the firm G. W. Dougherty for the last year and half of the tax period.
Looks like I might have been a bit tipsy when I attached the mounts to this page.