My experience may be a little unique as I came in from one of the companies that Carnegie acquired. I really, really loved the company I originally worked for, but I left soon after the merge was "final". I was not drinking the Carnegie Coolaid.
Originally, we were excited about the prospect of joining the Carnegie team, but were upset about how hush-hush the whole acquisition was. It also felt like there weren't a lot of answers to our questions and concerns about the acquisition and what that meant for us. They kept saying we'd figure it out when it was finalized. However, it was clear once the acquisition was final that Carnegie had no idea what they were doing or what to do with us. Our now department acted like our own company still, just called ourselves Carnegie now, but simultaneously a lot of folks were pulled randomly into the greater Carnegie group and removed from our team.
Some of the higher ups were generally involved in group slack channels and events, but their interactions felt super cliquey and exclusive; like there was always an inside joke I wasn't a part of.
The Wednesday all staff meetings are so cringe and honestly completely unnecessary - it could all be accomplished with an email and I get that they want everyone to be together, but what togetherness can you get with 250+ people on a zoom call where only 5 people generally talk anyways?
An other example of the disjointed and exclusivity of groups is how some groups would plan and go on these retreats or have group events and then post about how amazing they were on the general slack channel which just made everyone else feel like they were missing out or didn't deserve the same. Overall, I never felt like I was truly a part of the Carnegie Group.
Upon leaving I filled out my exit interview form super honestly with constructive comments and concerns and I inquired about what happens to the form and HR informed me that only she and the COO read it and the COO would "consider the information". AKA they don't care and nothing will come of it.
Since I left they've restructured my department twice and 3 more employees have left including an AVP who had been at our company (before acquisition) for 22 years.