Shipbroker Howard Houlder (Chartering) Ltd. has sold its shareholdings in the London Tanker Broker Panel back to the other five members of the rate-setting group, panel managing director Robert Porter said. "Howard Houlder is no longer a panel member," Porter said. Porter said he did not know why Houlder had decided to leave the panel - an independent body providing tanker rate/route assessments, for which fees are charged. Houlder had been in negotiations for some time with Capital Shipbrokers Ltd. to sell its shares for approximately $1.1 million, according to other brokers and press reports. A spokesman at Capital said the company could give no comment on the breakdown of negotiations. No one was immediately available at Houlder for comment.