Exhibit 16.3 [LOGO OF ARTHUR ANDERSEN] March 12, 2002 Office of the Chief Accountant Securities and Exchange Commission 450 Fifth Street, N.W. Washington, D.C. 20549 Dear Sir/Madam: We have read the first four (4) paragraphs of Item 4 included in the Form 8-K dated March 5, 2002 of TheStreet.com, Inc. to be filed with the Securities and Exchange Commission and are in agreement with the statements contained therein. Very Truly Yours, /s/ Arthur Andersen LLP - --------------------------- Arthur Andersen LLP cc: Mr. Thomas J. Clarke, TheStreet.com, Inc.