When I google a ticker like XLE or something, I see a price which updates frequently (about every second or so), where can I find this for options?
you can try CME DataSuite. Your broker gives you real time options quotes. If you do not have one you can open a scottrade account with just $500 deposit. When I moved my money from scottrade to ameritrade they did not close my account even till this day I can access my scottrade account and see real time quotes and the same research they offered me before. You can try withdrawing your deposit and see if it stays open like mine did. You probably will not find to many places if any that give you live quotes on options because for the general public there is not that high of a demand. Most people do not even know what stock options are.  You can get update on some sites like CNBC, but you will have refresh constantly to get the latest option prices.  You can also try an online broker, most of whom will let you have access to their tools and quotes if you sign up for an account. Some require a deposit before you can access those tools and some don't. Personally, I use TD Ameritrade and I do not believe they require a deposit to use their tools, but don't quote me on that.
"Where can I download all stock symbols of all companies ""currently listed"" and ""delisted"" as of today? That's incredibly similar . You can also do it with a Bloomberg terminal but there's no need to pay to do this because he data changes so slowly." "The current stock price you're referring to is actually the price of the last trade.  It is a historical price – but during market hours, that's usually mere seconds ago for very liquid stocks. Whereas, the bid and ask are the best potential prices that buyers and sellers are willing to transact at: the bid for the buying side, and the ask for the selling side.  But, think of the bid and ask prices you see as ""tip of the iceberg"" prices.  That is: The ""Bid: 13.20 x200"" is an indication that there are potential buyers bidding $13.20 for up to 200 shares.  Their bids are the highest currently bid; and there are others in line behind with lower bid prices.  So the ""bid"" you're seeing is actually the best bid price at that moment.  If you entered a ""market"" order to sell more than 200 shares, part of your order would likely be filled at a lower price. The ""Ask: 13.27 x1,000"" is an indication that there are potential sellers asking $13.27 for up to 1000 shares.  Their ask prices are the lowest currently asked; and there are others in line behind with higher ask prices.  So the ""ask"" you're seeing is the best asking price at that moment.  If you entered a ""market"" order to buy more than 1000 shares, part of your order would likely be filled at a higher price. A transaction takes place when either a potential buyer is willing to pay the asking price, or a potential seller is willing to accept the bid price, or else they meet in the middle if both buyers and sellers change their orders. Note: There are primarily two kinds of stock exchanges.  The one I just described is a typical order-driven matched bargain market, and perhaps the kind you're referring to. The other kind is a quote-driven over-the-counter market where there is a market-maker, as JohnFx already mentioned.  In those cases, the spread between the bid & ask goes to the market maker as compensation for making a market in a stock.  For a liquid stock that is easy for the market maker to turn around and buy/sell to somebody else, the spread is small (narrow).  For illiquid stocks that are harder to deal in, the spread is larger (wide) to compensate the market-maker having to potentially carry the stock in inventory for some period of time, during which there's a risk to him if it moves in the wrong direction.    Finally ... if you wanted to buy 1000 shares, you could enter a market order, in which case as described above you'll pay $13.27.  If you wanted to buy your shares at no more than $13.22 instead, i.e. the so-called ""current"" price, then you would enter a limit order for 1000 shares at $13.22.  And more to the point, your order would become the new highest-bid price (until somebody else accepts your bid for their shares.)  Of course, there's no guarantee that with a limit order that you will get filled; your order could expire at the end of the day if nobody accepts your bid." http://dailyfinance.com Enter a stock ticker, then click on the Chain link to the left. Then, click on the option tickers to see their charts. EDIT: the site has changed, and there are no more option charts. So why are option charts so tough to find? Options are derivatives of the stock. Option prices are defined by a formula. The inputs are stock pricxe, strike, days to expiration, dividend, risk-free interest rate, and volatility. Volatility is the only thing that cannot be easily looked up. With a Black-Scholes calculator, and some reasonable volatility selections, it's possible to make your own fairly accurate option chart. I don't think it's very enlightening, though. The interesting things are: the stock price movement (as always), and the nature of option pricing behavior in general (understanding how the formula represents crowd behavior). "I thought the other answers had some good aspect but also some things that might not be completely correct, so I'll take a shot. As noted by others, there are three different types of entities in your question:  The ETF SPY, the index SPX, and options contracts. First, let's deal with the options contracts.  You can buy options on the ETF SPY or marked to the index SPX.  Either way, options are about the price of the ETF / index at some future date, so the local min and max of the ""underlying"" symbol generally will not coincide with the min and max of the options.  Of course, the closer the expiration date on the option, the more closely the option price tracks its underlying directly.  Beyond the difference in how they are priced, the options market has different liquidity, and so it may not be able to track quick moves in the underlying. (Although there's a reasonably robust market for option on SPY and SPX specifically.) Second, let's ask what forces really make SPY and SPX move together as much as they do.  It's one thing to say ""SPY is tied to SPX,"" but how?  There are several answers to this, but I'll argue that the most important factor is that there's a notion of ""authorized participants"" who are players in the market who can ""create"" shares of SPY at will.  They do this by accumulating stock in the constituent companies and turning them into the market maker.  There's also the corresponding notion of ""redemption"" by which an authorized participant will turn in a share of SPY to get stock in the constituent companies. (See http://www.spdrsmobile.com/content/how-etfs-are-created-and-redeemed and http://www.etf.com/etf-education-center/7540-what-is-the-etf-creationredemption-mechanism.html) Meanwhile, SPX is just computed from the prices of the constituent companies, so it's got no market forces directly on it.  It just reflects what the prices of the companies in the index are doing. (Of course those companies are subject to market forces.) Key point: Creation / redemption is the real driver for keeping the price aligned.  If it gets too far out of line, then it creates an arbitrage opportunity for an authorized participant.  If the price of SPY gets ""too high"" compared to SPX (and therefore the constituent stocks), an authorized participant can simultaneously sell short SPY shares and buy the constituent companies' stocks.  They can then use the redemption process to close their position at no risk.  And vice versa if SPY gets ""too low."" Now that we understand why they move together, why don't they move together perfectly.  To some extent information about fees, slight differences in composition between SPY and SPX over time, etc. do play.  The bigger reasons are probably that (a) there are not a lot of authorized participants, (b) there are a relatively large number of companies represented in SPY, so there's some actual cost and risk involved in trying to quickly buy/sell the full set to capture the theoretical arbitrage that I described, and (c) redemption / creation units only come in pretty big blocks, which complicates the issues under point b. You asked about dividends, so let me comment briefly on that too.  The dividend on SPY is (more or less) passing on the dividends from the constituent companies. (I think - not completely sure - that the market maker deducts its fees from this cash, so it's not a direct pass through.)  But each company pays on its own schedule and SPY does not make a payment every time, so it's holding a corresponding amount of cash between its dividend payments.  This is factored into the price through the creation / redemption process.  I don't know how big of a factor it is though." An alternative to paying thousands of dollars for historical prices by the minute:  Subscribe to real time data for as low as USD$1.5/month from your broker, then browse the chart. In addition to all these great answers, check out the Wikipedia entry on options. The most important thing to note from their definition is that an option is a derivative (and nothing about any derivative is simple).  Because it is a derivative, increases or decreases in the price of the underlying stock won't automatically result in the same amount of change in the value of the option. BATS here means your data feed is coming from BATS only. You're not seeing up to date prices from NASDAQ, NYSE or any other of the ECNs. For a liquid equity like AAPL, BATS prices are typically up to date but for a less liquid listing, you wouldn't always see the NBBO. To get live feeds from every ECN, you have to pay. BATS is offering this information freely and that's why you're seeing it now. AAPL is listed on NASDAQ but you can trade pretty much everything on BATS, just like on other ECNs and exchanges. It's a drive by swipe at technicals, which is fine and all, but I always thought technicals effectively provide odds of an event happening. For example, $XYZ price is a support level, therefore there are increased odds it will bounce higher from these levels, rather than an implied *guarantee* the support will hold. so... asset price inflation decoupled from fundamentals (thank you QE) along with rise in ETF (notorious depressant on volatility) means options trader are underestimating volatility? Who calculates the daily spreads between HV and IV, anyone? Im new to this. Neither site offers index futures or options pricing.  Your best best is likely to get the quote from a broker who supports trading those vehicles. Free sites usually limit themselves to stocks and sometimes to options chains -- the exception is Reuters where just about any security for which you have the reuters formatted trading symbol can be quoted. "The ""price"" is the price of the last transaction that actually took place. According to Motley Fool wiki: A stock price is determined by what was last paid for it. During market hours (usually weekdays from 9:30AM-4:00PM eastern), a heavily traded issue will see its price change several times per second. A stock's price is, for many purposes, considered unchanged outside of market hours. Roughly speaking, a transaction is executed when an offer to buy matches an offer to sell. These offers are listed in the Order Book for a stock (Example: GOOG at Yahoo Finance).  This is actively updated during trading hours. This lists all the currently active buy (""bid"") and sell (""ask"") orders for a stock, and looks like this:  You'll notice that the stock price (again, the last sale price) will (usually*) be between the highest bid and the lowest ask price. * Exception: When all the buy or sell prices have moved down or up, but no trades have executed yet." While trading in stochastic I've understood, one needs reference (SMA/EMA/Bolinger Band and even RSI) to verify trade prior entering it. Stochastic is nothing to do with price or volume it is about speed. Adjusting K% has ability to turn you from Day trader to -> swing trader to -> long term investor. So you adjust your k% according to chart time-frame. Stochastic setup for 1 min, 5 min ,15, 30, 60 min, daily, weekly, monthly, quarterly, half yearly and yearly are all different. If you try hopping from one time-frame to another just because it is below oversold or above overbought region with same K%, you may get confused. Worst you may not square-off your loss making trade. And rather not use excel; charts gives better visual for oscillators. Well, kind of XD. I usually just look through Business Week for the ADRs that are on the OTC market. I don't do anything major, but why I love them is that they have a greater reach than just ADRs on the NYSE or NASDAQ. Like for instance, if I wanted to own Thai or European stocks, many of the larger, more reputable firms are listed on the OTC market. Having said that, most other sites don't have earnings reports laid out for you. Business Week does. The only fancy thing I am interested in are options and options on futures, and Bar Chart is good for the latter. "The fallacy in your question is in this statement: ""The formulas must exist, because prices can be followed real time."" What you see are snapshots of the current status of the stock, what was the last price a stock was traded at, what is the volume, is the price going up or down.  People who buy and hold their stock look at the status every few days or even every few months. Day traders look at the status every second of the trading day.  The math/formula comes in when people try to predict where the stock is going based on the squiggles in the line. These squiggles move based on how other people react to the squiggles.  The big movements occur when big pieces of news make large movements in the price. Company X announces the release of the key product will be delayed by a year; the founder is stepping down; the government just doubled the order for a new weapon system; the insiders are selling all the shares they can. There are no formulas to determine the correct price, only formulas that try to predict where the price may go." You may refer to project http://jstock.sourceforge.net. It is open source and released under GPL. It is fetching data from Yahoo! Finance, include delayed current price and historical price.