However the Abu Dhabi National Oil Company, to give its full name, has raised more than $19 billion over the past three years from overseas investors, according to Reuters calculations based on publicly released size of investments, signing fees and share sales.
That's equivalent to two-thirds of the $29.4 billion that Saudi Aramco raised in the biggest initial public offering (IPO) in history. Despite the record-breaking December listing, the bulk of the shares were sold to domestic investors after foreign institutions baulked at the valuation.
ADNOC, which supplies nearly 3% of global oil demand, has for example struck deals with the world's largest fund manager BlackRock and with US investment firm KKR, a rare foray for both into national oil companies in the Middle East.
It has also sold stakes in its pipeline infrastructure and refining businesses. See FACTBOX on key deals: While both Gulf state-controlled firms are aiming to replicate the model of oil majors by expanding in downstream, trading and petrochemicals, their funding strategies diverge, said Dmitry Marinchenko, analyst with Fitch rating agency.
"Aramco is raising funds mainly by conventional borrowing while ADNOC is using more sophisticated forms of funding, including selling minority stakes in subsidiaries," he said. "ADNOC is more open to cooperation with international partners."
It remains to be seen which approach to attracting investment will prove more fruitful in coming years. But at stake could be the companies' ability to successfully diversify from crude production and, more broadly, for the domestic economies that rely on them to weather oil price shocks.
"The biggest challenge is the uncertainty in the outlook for oil and the growing international scrutiny that all energy companies are facing because of climate change," said Helima Croft, managing director of RBC Capital Markets.
The reforms have been driven by Abu Dhabi Crown Prince Sheikh Mohammed bin Zayed, de-facto ruler of the wider United Arab Emirates. Their roots can be traced back to 2016, when oil prices fell to $30 a barrel, hitting state revenues and exposing how sensitive Abu Dhabi finances were to volatile prices. The crown prince, known as MbZ, appointed ally Sultan al-Jaber as CEO of ADNOC with a plan to restructure the company to make it more efficient and function more like a major than a state monopoly. Al-Jaber swiftly embarked on plans to reshuffle ADNOC's leadership and slashed 5,000 jobs, mainly foreigners, out of its 60,000 employees.