Institutional investing market
With the above risks considered, institutional investors are still incredibly important to the market. It literally wouldn't exist without them. Every highly traded exchange has market makers that increase liquidity and drive down transaction costs.
For example, let's say you want to buy shares of Nike (NKE -2.77%). When you put the order in with your broker, it is probably executed immediately. That isn't because you just happened to put the order in simultaneously with another party who conveniently wants to sell the exact same number of shares. It's because a market maker accepted the transaction. Market makers are trading shares throughout every day on the market. They buy shares from one party and then sell them seconds later to another. They aren't trying to make money on the trades; instead, they make money from the bid/ask spread.
When you sell a stock, you receive the bid price of the stock. When you buy, you pay the ask price. For most stocks, these are only a few cents apart, if that much. Market makers are processing potentially millions of transactions each day and make the spread on each. Stocks with more trading volume will have more market makers competing, which drives the bid/ask spread down. More thinly traded stocks have a higher spread, but it's still worth it because you may not have a chance to even buy without it.
Related Investing Topics