• Federal Signal 2023 shares outstanding were 0.062B, a 0.49% increase from 2022.
• Federal Signal 2022 shares outstanding were 0.061B, a 1.13% decline from 2021.
• Federal Signal 2021 shares outstanding were 0.062B, a 0.32% increase from 2020.

Shares outstanding can be defined as the number of shares held by shareholders (including insiders) assuming conversion of all convertible debt, securities, warrants and options. This metric excludes the company's treasury shares.