Walmart said in a statement it was confident "a Walmart and Microsoft partnership would meet both the expectations of US TikTok users while satisfying the concerns of US government regulators."
Walmart explained its interest came from how the app "integrated e-commerce and advertising capabilities in other markets," and could help it connect with customers.
The US retail giant is flush with cash, as one of the US economy's pandemic winners.
Its group sales soared by $7.4 billion to $138 billion in the second quarter of 2020, from the same three months a year ago.
It has Amazon in its sights as a competitor, with its digital business loss-making, but starting to close the gap separating it from the e-commerce behemoth, said its chief executive Doug McMillon.
TikTok would both allow WalMart to aim at a more youthful demographic, and potentially give it access to valuable consumer data of the sort Trump fears will fall into Chinese government's hands.
US President Donald Trump signed an executive order on August 6 requiring TikTok either to cease its US operations or find a US buyer.
TikTok towards a deal A growing number of bidders raises the possibility both of a successful deal and a high purchase price.
Reports have suggested TikTok's US operations could fetch between $30 billion and $50 billion, with the possibility a buyer may then seek to acquire TikTok's business in other countries such as India.
TikTok has 80 million users in the US. India has banned TikTok, as its relationship with China, like that of the US, has grown more frosty.
The Trump administration has alleged Chinese owners ByteDance may be able to collect information on US citizens, including government employees and contractors, and possibly use that data for blackmail purposes, claims TikTok contested on Monday in a California federal court.
- TikTok CEO Kevin Mayer quits amid US-China crossfire
- TikTok vs. Trump: ByteDance takes US government to court
- Oracle latest TikTok suitor, as video app defends virtue
- Trump call reboots Microsoft's TikTok buyout talks
- US adds 38 more Huawei-related firms to its naughty list
- Does Huawei have a future?
— Pádraig Belton, contributing editor, special to Light Reading