At the same time, US computer giants Apple and Microsoft were valued at more than $2.3 trillion and more than $2.1 trillion, respectively.
Aramco reached the milestone as crude oil prices climb to more than $82 a barrel, the highest in 7 years.
Bank of America analysts estimated prices could reach more than $100 per barrel for the 1st time in 7 years, Bloomberg reported, noting that the rising prices add to Saudi Aramco's bottom line.
Saudi Aramco CEO Amin Nasser said his company is working on increasing its crude production capacity even as investments in the oil industry is falling down and the company is challenged with reducing carbon emissions.
The Saudi government owns 98% of Saudi Aramco, and the rest is available on the Saudi stock exchange.