Guardian News and Media has confirmed the names of four more journalists taking voluntary redundancy, as part of changes to the Guardian and Observer business teams.

The Guardian's business editor Deborah Hargreaves has taken voluntary redundancy and will leave on 26 February.

Her departure will be followed by Nick Mathiason, who will leave the reporting team in March, and Geoff Gibbs, who will leave the newsdesk in April.

Ashley Seager from GNM's economic team left GNM on Friday and has plans to write a book.

Following Hargreaves departure, current head of business Dan Roberts will become business editor for Guardian News & Media with responsibility for business output across the Guardian, Observer and online.

GNM has appointed Katie Allen to the economics team and will make another appointment shortly, a spokeswoman confirmed.

In January sources suggested that 40 GNM staff had had their requests for voluntary redundancy confirmed as part of a scheme announced in last year to help reduce the group's losses, which are estimated at £100,000 a day.

In November GNM said it was seeking 100 volunteers from across its commercial and editorial operations for redundancy, but that some compulsory job losses had not been ruled out.

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