Blackstone was given an informal nod by the US Treasury Department that a $3bn investment by China did not merit a national security investigation, according to people familiar with the deal.

The private equity group, which is making its stock market debut on Friday received the “favourable” opinion after approaching the Treasury before and after the deal was sealed. The Treasury department chairs the secretive inter-agency panel that vets foreign deals on national security grounds, which is known as Cfius.