iShares are a family of exchange-traded funds (ETFs). The first iShares were known as WEBS but were since rebranded. Each iShares fund tracks a bond or stock market index. The following stock exchanges list iShares funds: London Stock Exchange, American Stock Exchange, New York Stock Exchange, BATS Exchange, Hong Kong Stock Exchange, Toronto Stock Exchange, Australian Securities Exchange and several European and Asian stock exchanges. iShares is the largest issuer of ETFs in the US and globally.