Can you please explain what the information in this stock quote means?
Yes, that's what it means. Also, it tells you that the share price went up by $0.39 yesterday, which was an increase of 1.43% from the previous day's price, and that the total value of all of Microsoft's shares is $232.18 billion (from which we can deduce that there are a bit less than 10 billion Microsoft shares in total).
"I'm familiar with and have traded U.S.-listed LEAPS and I've always used the CBOE quotes page you linked to.  So, I too was surprised I couldn't find 3M (MMM) LEAPS quotes at that page, even after checking the ""List all options, LEAPS, Credit Options & Weeklys if avail."" radio button.  Used to work! Fortunately, I was able to get access to the full chain of option quotes from the CBOE's other quotes page:  Go to the ""Quotes & Data"" menu, then select Delayed Quotes - NEW!  Here's how: I think the new interface is terrible: it's too many steps to get to the information desired.  I preferred the all-in-one table of the Delayed Quotes Classic page, the one you linked to. As to why that classic page isn't yielding the full chain, I can only suggest it is a recently introduced bug (software defect).  I certainly was able to get LEAPS quotes from that page before. On Yahoo! Finance option quotes: I don't know why their chain is incomplete – I can't see the logic, for instance, as to why MMM Jan 2012 60 calls are missing.  I thought at first it may be lack of volume or open interest, but nope.  Anyway, I don't trust Yahoo! to provide accurate, reliable quotes anyway, having seen too many errors and missing data in particular in the feed of Canadian stocks, which I also trade. I rely on the exchange's quotes, and my broker's real-time quotes.  I check Yahoo! only for convenience sake, and when it actually matters I go to the other more reliable sources. For what it's worth, though, you can also get full chain option quotes at NASDAQ.  See here for the 3M (MMM) example then click on the ""Jan 12"" link near the top.  However, I would consider CBOE's quotes more definitive, since they are the options exchange." "So, if an out-of-the-money option (all time value) has a price P (say $3.00), and there are N days... The extrinsic value isn't solely determined by time value as your quote suggests. It's also based on volatility and demand. Here is a quote from http://www.tradingmarkets.com/options/trading-lessons/the-mystery-of-option-extrinsic-value-767484.html distinguishing between extrinsic time value and extrinsic non-time value: The time value of an option is entirely predictable. Time value premium declines at an accelerating rate, with most time decay occurring in the last one to two months before expiration. This occurs on a predictable curve. Intrinsic value is also predictable and easily followed. It is worth one point for every point the option is in the money. For example, a call with a strike of 30 has three points of intrinsic value when the current value of the underlying stock is $33 per share; and a 40 put has two points of intrinsic value when the underlying stock is worth $38. The third type of premium, extrinsic value, increases or decreases when the underlying stock changes and when the distance between current value of stock and strike of the option get closer together. As a symptom of volatility, extrinsic value may be greater for highly volatile underlying stock, and lower for less volatile stocks. Extrinsic value is the only classification of option premium that is unpredictable. The SPYs you point out probably had a volatility component affecting value. This portion is a factor of expectations or uncertainty. So an event expected to conclude prior to expiration, but of unknown outcome can cause theta to be higher than p/n. For example, a drug company is being sued and the outcome of a trial will determine whether that company pays out millions or not. The extrinsic will be higher than p/n prior to the outcome of the trial then drops after.  Of course, the most common situation where this happens is earnings. After the announcement, it's not unusual to see a dramatic drop in the extrinsic portion of options. This is why sometimes a new option trader gets angry when buying calls prior to earnings. When 'surprise' good earnings are announced as hoped, the rise is stock price is largely offset by a fall in extrinsic value giving call holders little or no gain! As for the reverse situation where theta is lower than p/n would expect? Well you can actually have negative theta meaning the extrinsic portion rises over time. (this statement is a little confusing because theta is usually described as negative, but since you describe it as a positive number, negative here means the opposite of what you'd expect).  This is a quote from ""Option Volatility & Pricing"". Keep in mind that they use 'positive' theta to mean the time value increases up over time: Is it ever possible for an option to have a positive theta such that if nothing changes the option will be worth more tomorrow than it is today? When futures options are subject to stock-type settlement, as they currently are in the United States, the carrying cost on a deeply in-the-money option, either a call or a put, can, under some circumstances, be greater than the volatility component. If this happens, and the option is European (no early exercise permitted), it will have a theoretical value less than parity (less than intrinsic value). As expiration approaches, the value of the option will slowly rise to parity. Hence, the option will have a positive theta. Sheldon Natenberg. Option Volatility & Pricing: Advanced Trading Strategies and Techniques (Kindle Locations 1521-1525). Kindle Edition." "Most of the time* you're selling to other investors, not back to the company. The stock market is a collection of bid (buy offers) and asks (sell offers). When you sell your stock as a retail investor at the ""market"" price you're essentially just meeting whatever standing bid offers are on the market.  For very liquid stocks (e.g. Apple), you can pretty much always get the displayed price because so many stocks are being traded. However during periods of very high volatility or for low-volume stocks, the quoted price may not be indicative of what you actually pay.  As an example, let's say you have 5 stocks you're trying to sell and the bid-side order book is 2 stocks for $105, 2 for $100, and 5 for $95. In this scenario the quoted price will be $105 (the best bid price), but if you accept market price you'll settle 2 for 105, 2 for 100, and 1 for 95. After your sell order goes through, the new quoted price will be $95. For high volume stocks, there will usually be so many orders near the midpoint price ($105, in this case) that you won't see any price slippage for small orders.  You can also post limit orders, which are essentially open orders waiting to be filled like in the above example. They ensure you get the price you want, but you have no way to guarantee they'll be filled or not.  Edit: as a cool example, check out the bitcoin GDAX on coinbase for a live example of what the order book looks like for stocks. You'll see that the price of bitcoin will drift towards whichever direction has the less dense order book (e.g. price drifts upwards when there are far more bids than asks.)" College professor here. I often think about the fact that all the information I teach is available online. Students are paying a premium for my course- what of value do I bring?  **Filter** There is a lot of good information online, but there is also a lot of inaccurate information. I filter out inaccurate information.   **Structure** I organize material in a way that makes it easier to digest  **Elaboration** I provide context and examples. I'm able to explain complex topics in several different ways in case students don't get it the first time.   **Motivation** I explain *why* students need to learn something; I hold them accountable for deadlines.   **Social interaction** I get students to talk with one another and see material from multiple view points.   **Feedback** This is, in my opinion, the most valuable thing I provide to students, and I invest *a lot* of time in it. What are students doing well? What are they not doing well? How can they improve?  This doesn't mean intelligent, motivated individuals can't learn from online materials as well as in a classroom- I believe they can. But the classroom environment does provide some advantages over teaching yourself material online. Stock price is an indicator about the health of the company.  Increased profits (for example) will drive the stock price up; excessive debt (for example) will drive it down. The stock price has a profound effect on the company overall: for example, a declining share price will make it hard to secure credit, attract further investors, build partnerships, etc.  Also, employees are often holding options or in a stock purchase plan, so a declining share price can severely dampen morale. In an extreme case, if share prices plummet too far, the company can be pressured to reverse-split the shares, and (eventually) take the company private.  This recently happened to Playboy. If anyone offers you guaranteed better than average returns, run. They are either lying to you or to themselves. (Claiming that they will try to beat the market is more credible, but that becomes a matter of whether there is any reason to believe that they'll succeed.) If anyone sends you an unsolicited stock tip, run. They wouldn't be doing so if it wasn't an attempt to manipulate you or the market or both. Most likely its a pump-and-dump attempt. "What does ""points"" mean In any stock market, there are certain stocks that go up and certain stocks that go down. Hence if we want to find the generic health of stock market, i.e. on an average is it going up or down, we have no means to find out.  A practise that has evolved over the years is take a set of companies and find if on average they have gone up or gone down. In very simple terms say in 1970 I take the Market Capitalization of a set of 50 companies, lets say its value is ""X"". I would now call this index as value of 100. Now after a month if the Market Capitalization is 2X, the index value would be 200. After another month if the Market Capitalization come down to 1.5X, then index value would be 150. So essentially now one is able to get the general trend more easily. S&P is an index of Select 500 companies based on various parameters. So in isolation 2000 does not mean anything. However as a comparison it does give quite a bit of insight. Note there are various adjustments made to factor, i.e. certain companies go bankrupt or are not doing well are removed from Index, share splits, mergers, etc. This ensure that the Index is neutral and does not show unwarranted spikes." The quotes on JSE are for 100 share lots.  The quotes on NYSE are for single shares.  That still leaves some price difference, but much less than you calculated. (EDIT: Equivalently, the price is quoted in 1/100th of a Rand.  The Reuter's listing makes this explicit since the price is listed as ZAc rather than ZAR.  http://www.reuters.com/finance/stocks/overview?symbol=HARJ.J) As noted in the other answer currently up, NYSE is quoting American Depositary Receipts (ADRs) for this company, which is not directly its stock.  The ADR in this case, if you check the prospectus, is currently 1 share of the ADR = 1 share of the stock on its home market.  A US institution (in this case it looks like BNY Mellon) is holding shares of stock to back each ADR. Arbitrage is possible and does happen.  It's not perfect though, because there are a variety of other cost and risk factors that need to be considered.  There's a good review here: Report by JP Morgan Some summary points: