Most of the jobs, around 300 of the total 1,700 workforce, are being lost at plants in the West Midlands, with other losses at sites in Hartlepool, Wrexham and Tredegar, PwC - the administrator for the steel giant - said.
PwC said the redundancies would take immediate effect, with a number of sites already closed.
On October 19, Caparo Industries went into partial administration, having been hit by the crisis that has gripped UK's steel sector.
Unions have said cheap steel imports may be responsible for Caparo's financial problems, the BBC reported.
Also Read
A team of administrators, partners and directors from PwC were appointed joint administrators over the 16 companies but all other business interests of Caparo were unaffected, a statement from PwC had earlier said.
The Joint Administrators' team from PwC will rapidly take control of the 16 companies.
UK's steel sector is reeling under a series of blows and Paul's company is said to be a victim to combination of cheap imports of Chinese steel depressing prices, high energy costs and onerous taxes.
Paul is one of Britain's 50 wealthiest people with a fortune estimated at two billion pounds. He holds a large stake in Caparo Industries through its parent company, Caparo Group.