There are many reasons workers quit their jobs — low pay, not enough flexibility, burnout. But many also leave because they don't see a path toward internal advancement. Nearly a fifth, 17% of workers who quit in 2022 did so because of limited growth opportunities at their company, according to a January 2023 Joblist survey of more than 30,000 job seekers.

Luckily, some companies do invest in helping their workforce advance. Data research company the Burning Glass Institute, Harvard Business School and the Schultz Family Foundation recently ranked the 250 biggest U.S. public companies in terms of this kind of investment. Their report is called the American Opportunity Index.