As of June 2007, SPY ETF has become the largest exchange stock trading fund in the world. It is sponsored by PDR services LLC, which in itself is a subsidiary of American Stock Exchange LLC. It does, however, have some considerable competition on the market. The most formidable ETFs holding stock picks are listed on the New York Stock exchange as IVV, RSP, SH, RSU, SSO, RSW, SDS, UPRO and SPXU.

An exchange-traded fund (ETF) is a method of trading on stock exchanges. In principle, an ETF is worth the same as the stocks they represent. This is valued at whatever those assets are worth over the day’s trading. As of 2009, there are 680 exchange-traded funds on the US markets, accounting for $610 billion in assets.

Their popularity is based on the easy diversification that they facilitate across the entire index. In addition, ETFs are usually much cheaper to manage than most other trading options. They are also much more tax efficient than shares and stocks. As they can be bought at any time during the day they are also more flexible. Unlike other options, there is much more market transparency to ETFs.

ETFs are routinely criticized for several reasons. First, that they are short-term in scope. Second, they do not provide sufficient diversification. Third, the so called tax advantages are worthless to investors using tax deferred accounts. Fourth, they can be used to manipulate market prices. Most concede that a broadly diversified ETF can be a wise investment.

Their origin lies with the Index Participation Shares (IDSs) of the late 1980s. IDSs were traded on the American Stock Exchange and the Philadelphia Stock Exchange. Eventually the practice was stopped following a lawsuit by the Chicago Mercantile Exchange.

Te Toronto Stock Exchange then began to trade its own version of IDS. These proved to be extremely popular, and the American Stock exchange looked for something similar that they could use. The result was the ETF. SPDRs are often referred to as “spiders” or “spyders”.

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