United healthcare in 2022 had $324 billion revenue (up from $75 billion in 2007) and profits of $20 billion (both up >15% year on year). There is absolutely no risk that they become insolvent.

https://www.statista.com/statistics/214504/total-revenue-of-...

https://www.healthcaredive.com/news/unitedhealth-2022-earnin...