Softbank committed to doubling the UK headcount by September 2021.
When Softbank bought Arm it had 1,747 UK staff when Softbank bought it.
Last week, takeover panel filings last week showed that it had increased UK staff numbers by 262 in the last 12 months to 3,004.
To meet its 2016 targets, it must have 3,494 UK staff by next September, an increase of 490.
Softbank’s recent sale of Arm to Nvidia is unlikely to be completed by September 2021.