Reception staff at the five-star Ritz-Carlton in Riyadh told the BBC the hotel was admitting guests.
More than 200 princes, ministers and businessmen had been held there and in other hotels.
At the end of January the Saudi prosecutor general's office said more than $100bn (£72bn) had been recovered.
It followed financial settlements agreed with those being held.
The prosecutor general's office said 56 people were still being held at the time, although some reports said the remaining detainees had been moved from the Ritz-Carlton to a prison.
