A corporate action is a significant event that brings about substantial changes in an organization, affecting its stakeholders, including shareholders.
These events receive approval from the company's board of directors, and shareholders may have the opportunity to vote on certain actions by providing their response.
If you have ownership of shares, no matter how small, in a US company that initiates a corporate action, you may receive an email inviting you to share your input.
Whether or not you receive an invitation to cast your vote will depend on the nature of the decision and the company's internal policies.