The Shaw Trust is seeking to reduce its workforce by 200 roles, putting 100 staff at risk of redundancy, Third Sector understands.
In a statement, the charity said the redundancies were being proposed after a strategic review of the structure, management and performance of the charity by its new chief executive, Chris Luck, in the wake of the takeovers.
About half of the 200 roles that are at risk of being lost will be removed by natural wastage, such as not replacing people who leave or not recruiting to some positions that are already vacant.
The majority of the positions affected will be in corporate roles and functions. A spokeswoman for the charity said the proposed job losses were part of a drive to remove duplication after the mergers with Ixion and Prospects.
The charity is also ending the lease on its Bristol headquarters and will move to Prospect’s headquarters in Bromley, south-east London, although this is not a factor in the redundancy and job losses proposed.
The spokeswoman said most of the roles will have gone before Christmas.
In a statement, Luck said: "The goal is to ensure that we can maximise what we do for our beneficiaries on behalf of our commissioners, in a sustainable manner fit for the future."
According to the charity’s latest accounts, the Shaw Trust had an income of almost £260m in the 17 months to 31 August 2018 and spent £258.7m in the same time period.
This meant a total surplus for the period of £18.3m, once gains on the charity’s investments and defined-benefit pension scheme were included.
The charity had 3,556 full-time-equivalent staff during the period covered by the accounts, up from 1,459 for the year to 31 March 2017, the previous accounting period.