Bitcoin is the most important asset in two of Abu Dhabi sovereign wealth funds, according to regulatory filings. 

Abu Dhabi’s Mubadala Investment Company disclosed Friday that it held a $490 million stake in BlackRock’s iShares Bitcoin Trust — the second-largest single holding across its entire 13F portfolio. 

And a Thursday filing from the Abu Dhabi Investment Council, another state-run fund, revealed a $273.6 million position in the popular Bitcoin exchange-traded fund. The stake is the biggest position in its portfolio.