To understand what is an option pool you must first understand the basic concept of a "stock portfolio". Stock portfolios are groups of investments that are held by a large number of investors. All of these investors have the same overall objective: to make a profit by purchasing and selling shares of stock (shares). But they do not all share the same degree of risk or reward. In other words, there are different levels of participation.When you buy a stock in the stock market, you are buying a "call option". A call option allows you to purchase a certain amount of shares at no cost. You only pay for this option if the market price of the stock rises as expected. Once the price of the stock increases, so does the option's strike price. If the investor bought the option when the market price was low, they are in essence lending money to the buyer of the option, which essentially reduces their risk by locking them into a lower price.But why would anyone want to participate in an option pool? This is primarily because someone is anticipating that a stock will go up in value. If they choose to invest in option securities, they will be able to purchase shares at a reduced cost. If this happens, they can then sell those shares at a higher price than they paid for them. But what makes startups such a profitable way to play the stock market is that the investor is not obligated to actually purchase the option at the pre-determined price once it is issued.This makes it possible for someone to participate in an option pool without ever actually paying money out of their own pocket. Investors can borrow money against the value of their option contracts. The best part is that this borrowing never has to be repaid. The reason is that the contract gives the investor the right to set a limit on the amount they will borrow. Once the option contract expires, the borrower loses the right to the cash value of the option.So how does this work exactly? Usually, the buyer pays for the option and then borrows from the lender a specific amount. At the end of the term of the loan, the lender will require that the option be fully paid for. However, most investors are wary of paying full prices for stocks. If they borrow the money early, they can miss the chance of making money.Another way to participate in an option pool is to invest in call options. This involves borrowing money from an option broker or pool institution. Once again, if they pay for the option before issuing the stock, they can miss the opportunity to earn money on their investment. Most investors opt to borrow small amounts of money rather than invest large sums of money, since the possibility of making money with small sums of money is slim.There is a third way to participate in an option pool that isn't as popular among investors: Option Combination. This is where people who wish to participate in a stock market trade pool place an option with a major stock exchange company. They'll typically borrow a small amount of money from the exchange, then purchase stock from the company at a set price once the option expires. At the end of the term of the loan, they'll either sell the option for a profit or simply collect the initial premium paid for the option along with the profit.While some investors have begun to enjoy the benefits of participating in option pool transactions, others believe it is not worth the risk. After all, it doesn't help if the investment goes unused. Those who use option brokers to place trades in option pools are typically sophisticated investors looking to make long term investments. Many choose to participate in these programs because they enjoy the increased liquidity; however, those who do so without the help of option brokers may find themselves at a disadvantage once the program ends.