Electrical World and Engineer, February 7, 1903, page 257:

Financial  Intelligence.
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    THE  AMERICAN  DE  FOREST  WIRELESS  TELEGRAPH  COMPANY was incorporated on January 5th at Kittery, Me., with a capitalization of $5,000,000, $500,000 of which is preferred cumulative and participative. The company is to operate under the patents of the De Forest Wireless Telegraph Company, throughout the United States and Porto Rico. The following is a list of the directors: Dr. Lee De Forest, Ph. D. Yale, scientific director; A. White, President Greater New York Security Company; Ferdinand W. Peck, capitalist, Chicago, Ill.; Henry Doscher, capitalist, Standard Terra Cotta Company; C. C. Galbraith, manager, Armour & Co.; W. N. Harte, Title Guarantee & Trust Company; M. M. MacRae, Strawbridge & Clothier, Philadelphia, Pa.; Clarence G. Tompkins, Berkshire Electric Company; Dr. Samuel V. Abel.
Stock issue from 1904:
1904 American DeForest Stock