Jack Swift, senior vice president of institutional sales at Janus Institutional Asset Management, left the firm on Aug. 24, confirmed spokesman James Aber. Mr. Swift reported to John Zimmerman, executive vice president and managing director of Janus Institutional, who left the firm on the same day to launch his own third-party marketing shop. The firm is exploring all options regarding Mr. Swifts replacement, Mr. Aber said. Mr. Swift could not be reached for comment.