HAHAHAH, lol empirical research on highly secretive trademark info. Good luck with that.
I'm as close as you are probably going to get to that.
I am currently doing software contract work for a large national health insurance company. Which includes healthcare.gov integration as well as creating a whole new product and backend suite for all parts of the business. I get to import all the sales data, underwriting figures, premiums, employee info, and what not. I know from my experience with this data that large business, even fortune 500 companies that aren't self insured (most of which are) have all lost huge bargaining power thanks to the ACA. Of uninsured people, the ACA had a ton of people sign up for health insurance. The few that haven't are doing the loophole healthcare "groups" like Christian Healthcare Ministries, homeless people, and a few stubborn holdouts that would rather pay the tax than pay for health insurance in any form.
The fact is the heatlhcare.gov put out a comparative price listing that anyone can look and compare against for full insurance and various levels. Couple that with more people having insurance, it has taken the wind out of collective bargaining for lower prices for most employers. Speaking of which, most of the very large companies tend to be self insured in the first place. Which means insurance companies are providing stop loss plans for those large companies. Which has completely different rates associated with it.