As Bloomberg works through the process of folding its new property – BusinessWeek – into its media portfolio, the WSJ reports that layoffs will include 100 people, or 25% of the total staff.

In a memo to staff, Bloomberg chief content officer Norman Pearlstine said that this week, meetings will include, “Marketing, Communications & Events.”

Almost no department will be spared, as meetings will also take place with, “Circulation and Production; Finance; Technology, Digital…Sales and Sales Development, and Editorial.” Bloomberg also announced this week that Josh Tyrangiel, the editor of Time.com, will become the publication’s new editor.

BusinessWeek‘s editor-in-chief, Stephen Adler will not be making the move to Bloomberg, following the company’s acquisition of the magazine. Neither will Roger Neal, GM of BusinessWeek‘s online operations. However, executive editors Ellen Pollock and John Byrne and managing editor Ciro Scotti will make the move and stay with BusinessWeek.

Bloomberg chief content officer Norman Pearlstine said in a memo to the troops today that the majority of BusinessWeek employees would be hired by Bloomberg.

Neal, along with Byrne, was primarily responsible for Business Exchange, a social networking site created by the publication to the tune of $20 million. So far, it accounts for 16% of BusinessWeek‘s digital revenue, but has not grown as fast as expected. We hear that is a source of discontent from many employees who feel the company overpaid to build it.