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Member Log In Texas Association of Business Brokers TABB is the oldest business broker trade association in the country but through its courses and support groups we continue to keep our members current. When you see the TABB logo it demonstrates to buyers sellers and the business transfer industry as a whole that you subscribe to the code of ethics and professional conduct of the Texas Association of Business Brokers. Look for this stamp of approval in all your business dealings. Buying or selling a business.