He did business from fashionable Rodeo Drive, with oil heirs and Wall Street power brokers as clients.
A limited partnership that includes the family trust of Gordon P. Getty, the oil heir, Chartwell had advocated a dividend increase.
The remaining $1.6 million was contributed by John Paul Getty, the oil heir.
Koch, the 51-year-old oil heir who began sailing in earnest less than 10 years ago, said in a telephone interview last week that he has never been on a 12-Meter.
But in February Edward P. Bass, the Texas billionaire and oil heir who financed the project, called for an outside review.
Koch, a 52-year-old oil heir from Kansas, is out to show that the science fueling his America syndicate rules the waves.
The offer came from an investment group that includes Gordon P. Getty, the oil heir, and the Fisher brothers of New York.
The 51-year-old Koch, an oil heir from Kansas, oversees business interests that range from computer chips to alternative-energy sources.
She worked the room before the vote to win 67 votes for her son, a nephew of Gordon Getty, the oil heir.
Her husband was the oil heir and subsequent philanthropist John Paul Getty, Jr.