Final answer:
A small piece of ownership in a company is called a share, a company's initial offering of stock is known as an initial public offering (IPO), a portfolio of stocks and bonds is referred to as an investment portfolio, and a public stock exchange is a marketplace where stocks are bought and sold.
Step-by-step explanation:
a) A small piece of ownership in a company is called a share.
b) A company's initial offering of stock is known as an initial public offering (IPO).
c) A portfolio of stocks and bonds is referred to as an investment portfolio.
d) A public stock exchange is a marketplace where stocks are bought and sold.