And then there were two.

ExxonMobil on Tuesday saw its credit rating downgraded from a sterling AAA as depressed oil prices are expected to keep the energy giant’s cash flow at lower-than-expected levels through 2018.

ExxonMobil debt, now rated AA+, had carried a AAA rating since 1930, according to S&P, the agency that cut ExxonMobil’s rating.

With the energy giant run by Chief Executive Rex Tillerson kicked from the AAA club, just Johnson & Johnson and Microsoft remain as the most trustworthy corporate borrowers.

Even Uncle Sam’s debt, downgraded to AA+ from AAA in 2011 amid debt-ceiling wrangling by Congress, and Apple, whose first debt offering three years ago was able to get just an AA+ rating, aren’t in the AAA club.

And Apple has more cash on hand than the US Treasury: $233 billion. As recently as 1980, there were 32 companies — including iconic names like Coca-Cola, Ford, Kraft and AT&T — with AAA-rated debt.

ExxonMobil shares on Tuesday gained 27 cents, to $87.60.

That plunge in oil prices has squeezed profits throughout the energy patch, pushing some smaller companies, like Quicksilver Resources, into bankruptcy.