That's according to media reports over the weekend.
It comes after Twitter last week offered incentives to advertising agencies to raise their spending on the platform.
The social network called the offer the 'biggest advertiser incentive ever on Twitter' according to an email seen by Reuters.
On Saturday (December 3), a reporter from Platformer News tweeted that Amazon plans to resume advertising at $100 million a year.
Though that is pending some security tweaks to the company's ads platform.
However, a source close to the matter told Reuters that Amazon had never stopped advertising on Twitter.
According to Bloomberg, Twitter owner Elon Musk announced Apple had 'fully resumed' promoting on the platform.
He also said Apple was the largest advertiser on the site.
Advertisers have grown concerned by Twitter after employees who work on content moderation lost their roles following Musk's takeover.
There were also incidents of spammers impersonating major public companies.
Musk later said the company had seen a 'massive' drop in revenue.
Apple and Twitter did not immediately respond to a Reuters request for comment on the matter.