audi Aramco’s debut international bond sale has drawn $85bn of orders from investors, with the world’s largest oil producer set to wrap up its landmark US dollar debt raising later on Tuesday.

Aramco opened books on the six-part deal — which is expected to be at least $10bn in size — on Monday, after marketing the deal in a series of meetings across Europe, Asia and the US last week.

A banker close to the deal said that the $85bn of investor orders are skewed towards the bond sale’s longer tranches, with Aramco offering investors the chance to buy 20- and 30-year at higher yields.

The Saudi state-backed oil company is marketing the new bonds at a price in line with Saudi government bonds. As borrowers typically look to drive in pricing levels before the close of a bond sale, it suggests that Aramco is targeting a cheaper borrowing cost than the Saudi government.

Credit rating agencies rate Aramco in line with the Saudi government due to its close interlinkages with the Saudi state. The oil company has told investors that credit rating agency Moody’s would have given it a top-notch triple-A credit rating if not for this, however, as Aramco is the most profitable company in the world, producing enough cash each year to cover its debt many times over.

The bond sale is due to wrap up later on Tuesday, with order books closing for European investors at 11am London time.