Pozen is chairman emeritus of MFSInvestmentManagement and also serves as a senior lecturer at the Harvard Business School and a senior research fellow at the Brookings Institution.
He refused and then gave traders at SAC Capital, Citadel Asset Management, and mutual-fund firms Janus Capital Group, Wellington Management Co. and MFSInvestmentManagement a heads up about the investigation.
Treasurys remain a top choice for investors who value short-term safety over long-term growth because they carry negligible risk of default, says Erik Weisman, a portfolio manager at fund company MFSInvestmentManagement.