The main purpose of this legislation, known as the Protecting Private Job Creators Act, is to relieve certain regulatory burdens related to the quoting of fixed-income securities. By doing so, the bill aims to promote more efficient trading and investment in these types of securities, which can ultimately support job creation and economic growth. One of the key provisions of the bill is the exemption of quotations for fixed-income securities from specific regulatory requirements outlined in a particular section of the Code of Federal Regulations.