A Security (or securities for multiple) is a term for a wide variety of investment instruments that have an interest in an underlying asset. They are often either pieces of ownership of a company (shares/stock/equity) or loans to a company (debt/bonds).
On Equivesto, equity (or shares) is the only type of security that is available. When looking at each company, take the time to review and understand exactly what type of shares are being offered.
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