bitsight[.]com/blog/windows-7-end-of-life-what-organizations-are-using-the-now-outdated-os
Nearly 90% of organizations with more than 10,000 employees are running Windows 7 on at least one computer, versus only 61% with less than 1,000 employees.
Only the education and government sectors have a Windows 7 deployment rate above 80% (education is 84% and government is 82%).
At organizations running Windows 7, the prevalence of Windows 7 is greater than one in four machines within retail (41%), transportation (41%), manufacturing (41%), and healthcare (44%).