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Shattuck retires from Exelon

Mayo A. Shattuck III, who as CEO of Constellation Energy Group led the sale of the Baltimore company to Exelon Corp., has retired as executive chairman of Exelon.

Shattuck’s last day as an employee of Exelon was Feb. 28, according to a Securities and Exchange Commission filing Thursday from the Chicago-based company. Shattuck will remain non-executive chairman and a director of the company, according to the filing.

Shattuck received an estimated $9.3 million in unvested stock options already earned and cash-based performance payments after Exelon completed its $7.9 billion acquisition of Constellation last month, according to SEC filings.