ATG understands that they closed with the intention of reopening with a new business model in the future.
Owner Adrian Kruger was contacted but has not so far responded to any questions.
Concerns over the status of the auction house surfaced on social media after Kruger Gibbons' accounts disappeared from Facebook and Twitter and their website was taken down.
Their account on thesaleroom.com has also been closed.
Kruger Gibbons sold jewellery, antique furniture and collectables.
