Which physical systems have M^2/J (mass^2/angular momentum) larger than c/G?

Question

If mass M and angular momentum J are known, which physical systems have a ratio M^2/J larger than c/G that are not black holes?

Elementary particles have smaller values. So has the galaxy. So has the Earth around the Sun.

But all black holes seem to be above the limit.

Is there any exception, i.e., is there any non-black hole for which M^2/J is larger than c/G?

Note: J should be measured with respect to a point inside the system. Or, in other words, the question is about rotating systems.