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By the age of twelve, Warren had saved $120. In the spring of 1942, he enlisted his sister Doris as a partner and purchased three shares of Cities Service Preferred. The stock plunged from $38.25 to $27. When the stock recovered to $40, Warren sold, netting a $5 profit for the two siblings. He was, however, shocked to see the stock then continue to rise until it hit $202 per share a short period of time later. Warren realized that if he had held off selling a little bit longer, he and his sister would have netted a profit of almost $500.