Daniel Wild and Marius Dorfmeister resigned from their roles as co-CEOs at RobecoSAM, having accepted new roles elsewhere, a spokeswoman said Friday.
Mr. Dorfmeister will stay with the company through at least the end of April, she said.
Mr. Wild will remain with RobecoSAM "until a smooth handover and transition is ensured," she added. The spokeswoman did not comment about the reason for their departures or where they were headed.
Separately, Credit Suisse announced Friday in a news release that Mr. Wild had been named global head of environmental, social and governance strategy. Mr. Wild joined RobecoSAM in 2006.
The board of RobecoSAM is currently working on succession plan and will present it to the Swiss regulator FINMA, according to the spokeswoman. A date for the plan's submission wasn't specified.
The executives' decisions to resign is regrettable, said Kuno Kennel, chair of the RobecoSAM board of directors, in a news release Friday.
"In (Mr. Dorfmeister's) tenure, he revived the distribution of RobecoSAM's capabilities in various markets and forged strong ties with Robeco colleagues around the world," Mr. Kennel said. "His efforts lead to notable development of the business and new assets."
Mr. Kennel said Mr. Wild's effort had led "to impressive development of the research and methodology in the field of sustainability investing."