Dimension Brokerage, LLC is a full service trading firm specializing in providing trading services to professional traders. We are headquartered at 91 Fifth Avenue in the heart of New York City. Dimension Brokerage, LLC provides traders with the exclusive use of the Blackwood Pro trade software which serves the active trader with fast order entry and trade executions. Staffed with trading professionals our support team understands the importance of competent live customer service.