BlackBerry's chief operating, marketing and financial officers are leaving as recently appointed CEO John Chen makes his mark on the struggling mobile vendor.

COO Kristian Tear, CMO Frank Boulben and CFO Brian Bidulka all are leaving BlackBerry, the company announced yesterday. James Yersh, the former controller and head of compliance, will take over the top financial spot.

No replacements were named for Tear or Boulben, who both were hired by ousted CEO Thorsten Heins in May 2012 as BlackBerry geared up for the launch of BlackBerry 10 smartphones and a renewed consumer marketing effort. BlackBerry 10 didn't launch until the following January, and the company has since moved away from the consumer business.

"I look forward to working more directly with the talented teams of engineers, and the sales and marketing teams around the world to facilitate the BlackBerry turn-around and to drive innovation," Chen said. Departing CFO Bidulka, who worked at BlackBerry for eight years, will remain as a special adviser to assist with the transition for the rest of the company's fiscal year.

BlackBerry named Chen as CEO on November 4, the same day the company said it would accept a $1 billion loan from a consortium of investors but drop plans to sell itself. Under Heins, BlackBerry had pinned its hopes on the BlackBerry 10 platform but ended up taking an inventory charge of nearly $1 billion that was mostly associated with the recently introduced Z10 handset.

"I will continue to align my senior management team and organizational structure, and refine the company's strategy," Chen said.

He is the former CEO of Sybase, which entered the mobile market under Chen and was later sold to SAP.

BlackBerry also announced the resignation of board member Roger Martin, who had served since 2007.