I think this was a very significant announcement for a few reasons. First, it adds AXA US to Brighthouse, TIAA, and SCOR US on the list of significant annuity and life (re)insurance companies with largest employment hubs in Charlotte (plus Wells' reinsurance operations are here too). Second, a few days after this announcement, AXA announced that it is looking to spin-off AXA US into a separate entity (similar to the Brighthouse spin-off by MetLife), which could possibly give Charlotte a shot at getting a new HQ designation down the road. Third, these jobs are across all operations, such as finance, accounting, legal, IT, HR, customer service, which adds a lot of depth to the insurance industry talent in the city.
As far a quiet expansions go, I've heard that Allstate and Hartford have been expanding here in Charlotte too.
These things have cumulative effects, and I would love to see Charlotte become known as an insurance capital in addition to a banking capital.