As he prepares to leave Goldman, Sachs & Co., J. Christopher Flowers is bulking up his holdings in Enstar Group Inc., an investment vehicle based in Montgomery, Ala.

Mr. Flowers, an Enstar director, acquired 30,000 shares in the company on Sept. 9 at $13.435 per share, lifting his holding to 75,195 shares, according to a regulatory document filed Tuesday with the Securities and Exchange Commission.

Mr. Flowers, a Goldman partner who has engineered some of banking's biggest mergers and designed the investment bank's initial public offering, is scheduled to leave Goldman at the end of November to pursue a career in investing.

Enstar, which in 1995 sold a 48% stake it held in American Savings Bank of Florida, Miami, to First Union Corp. for stock and cash, recently sold its First Union stock. The transaction left it with $67 million of cash to invest.

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