According to executive compensation data research firm Equilar, the number of directors on a company’s board directly correlates with the size of the company.

Equilar’s evaluation of 1,185 companies in the S&P 1500 found that the most common number of directors on a board is nine, while the average size of a board is slightly higher at 9.5 directors. It said that at the low end, there are two companies with only four directors while the company with the largest board had 34 directors.