Japan's SoftBank intended to sell the UK tech company to Nvidia for about $40bn (£29.5bn).
But Digital Secretary Oliver Dowden said he wanted the UK's competition watchdog to assess its implications.
"Following careful consideration of the proposed takeover, I have today issued an intervention notice," he said.
"As a next step and to help me gather the relevant information, the UK's independent competition authority will now prepare a report on the implications of the transaction, which will help inform any further decisions."
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