Ms Berger said Labour had become institutionally anti-Semitic and she was “embarrassed and ashamed” to stay.
Mr Corbyn said he was “disappointed” the MPs had felt unable to continue working for the policies that “inspired millions” at the 2017 election.
The MPs are not launching a new political party – they will sit in Parliament as the Independent Group.
But Chuka Umunna said they had “taken the first step” and urged other Labour MPs – and members of other parties – to join them in “building a new politics”.
