Search Factiva:

• Hover over Search in the top menu and select Search Builder.
• in the Subject field, begin typing management in the subject search box and when the list of suggested subjects appears, select Management Moves.

Use Bloomberg (see access details).

• Search News: Topic Who's News People --- type NI WNEWS and press <GO>. 

Look in WRDS (see access details):

• To track CEO changes for S&P 1500 companies, use Execucomp (accessible under Compustat - Capital IQ)
• To identify CEO changes at more than 2,000 North American public companies, use MSCI - MSCI GMI Ratings - CEOs.