If they're in the S&P 500, you can assume that they do. McKinsey's influence isn't just via consultants either, plenty of execs are former McKinsey people. Sundar Pichai and Sheryl Sandberg being two big names.
Yeah. BigCo administrators universally point to business intelligence arising from competitors as the 'second pillar' in justifying policy, especially related to internal corporate organization or HR standards.