How to map stock ticker symbols to ISIN (International Securities Identification Number)?
There is no simple way to convert an ISIN into a stock ticker symbol. The only way to even attempt to do so is to map the ISIN to a CUSIP or SEDOL or other national identifier and then map that identifier to a stock ticker symbol. "It is possible to make a REST API call providing the ISIN to get the ticker in the response:  Python code for getting ticker for ISIN=US4592001014:  import requests  url = 'https://api.openfigi.com/v1/mapping'  headers = {'Content-Type':'text/json', 'X-OPENFIGI-APIKEY':'myKey' }  payload = '[ {""idType"":""ID_ISIN"",""idValue"":""US4592001014""}]'   r = requests.post(url, data=payload, headers=headers)"
If the first one is literally a company name, then 'company name' is fine. However, companies can issue shares more than once, and those shares might be traded separately, so you could have 'Google ordinary', 'Google preference', 'Google ordinary issue B'. Seeing the name spelled out in full like this isn't as common as just the company name, but I'd normally see it referred to as 'display name'. The second one is 'symbol', 'ticker', 'ID', and others. Globally, there are many incompatible ways of referring to a stock, depending on where it's listed (companies can have dual listings, and different exchanges have different conventions), and who's referring to it (Bloomberg and Reuters have different sets of IDs, with no predictable mapping between them). So there's no one shorthand name, and the word you use depends on the context. However, 'symbol' or 'ticker' is normally fine. The article links to William Bernstein’s plan that he outlined for Business Insider, which says: Modelling this investment strategy Picking three funds from Google and running some numbers. The international stock index only goes back to April 29th 1996, so a run of 21 years was modelled.  Based on 15% of a salary of $550 per month with various annual raises: Broadly speaking, this investment doubles the value of the contributions over two decades. Note:  Rebalancing fees are not included in the simulation. Below is the code used to run the simulation.  If you have Mathematica you can try with different funds.    Notice above how the bond index (VBMFX) preserves value during the 2008 crash.  This illustrates the rationale for diversifying across different fund types. I use and recommend barchart.com. Again you have to register but it's free. Although it's a US system it has a full listing of UK stocks and ETFs under International > London. The big advantage of barchart.com is that you can do advanced technical screening with Stochastics and RS, new highs and lows, moving averages etc. You're not stuck with just fundamentals, which in my opinion belong to a previous era. Even if you don't share that opinion you'd still find barchart.com useful for UK stocks. Another one I have seen mentioned used is Equity Feed. It had varies levels of the software depending on the markets you want and can provide level 2 quotes if select that option. http://stockcharts.com/ is also a great tool I see mentioned with lots of free stuff. Thanks to this youtube video I think I understood the required calculation. Based on following notation: then the formula to find x is: I found afterwards an example on IB site (click on the link 'How to Determine the Last Stock Price Before We Begin to Liquidate the Position') that corroborate the formula above. "You cannot determine this solely by the ticker length. However, there are some conventions that may help steer you there. Nasdaq has 2-4 base letters BATS has 4 base letters NYSE equity securities have 1-4 base letters. NYSE Mkt (formerly Amex) have 1-4 base letters. NYSE Arca has 4 base letters OTC has 4 base letters. Security types other than equities may have additional letters added, and each exchange (and data vendors) have different conventions for how this is handled. So if you see ""T"" for a US-listed security it would be only be either NASDAQ, NYSE or NYSE Mkt. If you see ""ANET"" then you cannot tell which exchange it is listed on.  (In this case, ANET Arista Networks is actually a NYSE stock). For some non-equity security types, such as hybrids, and debt instruments, some exchanges add ""P"" to the end for ""preferreds"" (Nasdaq and OTC) and NYSE/NYSE Mkt have a variety of methods (including not adding anything) to the ticker.  Examples include NYSE:TFG, NYSEMkt:IPB, Nasdaaq: AGNCP, Nasdaq:OXLCN.  It all becomes rather confusing given the changes in conventions over the years. Essentially, you require data that provides you with ticker, listing location and security type. The exchanges allocate security tickers in conjunction with the SEC so there are no overlaps.  eg. The same ticker cannot represent two different securities. However, tickers can be re-used.  For example, the ticker AB has been used by the following companies:" Well i dont know of any calculator but you can do the following 1) Google S&P 500 chart 2) Find out whats the S&P index points (P1) on the first date 3) Find out whats the S&P index points (P2) on the second date 4) P1 - P2 = result "The S&P 500 index is maintained by S&P Dow Jones Indices, a division of McGraw Hill Financial. Changes to the index are made periodically, as needed.  For Facebook, you'll find it mentioned in this December 11, 2013 press release (PDF).  Quote: New York, NY, December 11 , 2013 – S&P Dow Jones Indices will make the following changes to the S&P 100, S&P 500, MidCap 400   and S&P SmallCap 600 indices after the close of trading on Friday,   December 20: You can find out more about the S&P 500 index eligibility criteria from the S&P U.S. Indices methodology document (PDF).  See pages 5 and 6: Market Capitalization - [...] Liquidity - [...] Domicile - [...] Public Float - [...] Sector Classification - [...] Financial Viability - Usually measured as four consecutive quarters of positive as   reported earnings. [...] Treatment of IPOs - Initial public offerings should be seasoned for 6 to 12 months   before being considered for addition to an index. Eligible Securities - [...]   [...]   Changes to the U.S. indices other than the TMIX are made as needed,   with no annual or  semi-annual reconstitution. [...] LabCorp may have a smaller market cap than Facebook, but Facebook didn't meet all of the eligibility criteria – for instance, see the above note about ""Treatment of IPOs"" – until recently. Note also that ""Initial public offerings should be seasoned for 6 to 12 months"" implies somebody at S&P makes a decision as to the exact when. As such, I would say, no, there is no ""simple rule or formula"", just the methodology above as applied by the decision-makers at S&P." Try Google Finance Screener ; you will be able to filter for NASDAQ and NYSE exchanges. One of the most useful ways to depict Open, High, Low, Close, and Volume is with a Candlestick Chart. I like to use the following options from Stockcharts.com: http://stockcharts.com/h-sc/ui?s=SPY&p=D&yr=0&mn=3&dy=0&id=p57211761385 There are no legal reasons preventing you from trading as a F-1 visa holder, as noted in this Money.SE answer. Per this article, here are the things you need to set up an account: What do I need to have for doing Stock trading as F1 student ? Typically, most of the stock brokerage firms require Social Security   Number (SSN) for stock trading. The reason is that, for your capital   gains, it is required  by IRS for tax purposes. If you work on campus,   then you would already get SSN as part of the job application   process…Typically, once you get the on-campus job or work   authorization using CPT or OPT , you use that offer letter and take   all your current documents like Passport, I-20, I-94 and apply for SSN   at Social Security Administration(SSA) Office, check full details at   SSA Website . SSN is typically used to report job wages by employer   for tax purposes or check eligibility of benefits to IRS/Government. I do NOT have SSN, Can I still do stock trading as F1 student ? While many stock brokerage firms require SSN, you are not out of luck,   if you do not have one…you will have to apply for an ITIN Number (   Individual Taxpayer Identification Number )  and can use the same when   applying for stock brokerage account.  While some of the firms accept   ITIN number, it totally depends on the stock brokering firm and you   need to check with the one that you are interested in. The key thing is that you'll need either a SSN or ITIN to open a US-based brokerage account. I believe that it's not possible for the public to know what shares are being exchanged as shorts because broker-dealers (not the exchanges) handle the shorting arrangements.  I don't think exchanges can even tell the difference between a person selling a share that belongs to her vs. a share that she's just borrowing.  (There are SEC regulations requiring some traders to declare that trades are shorts, but (a) I don't think this applies to all traders, (b) it only applies to the sells, and (c) this information isn't public.) That being said, you can view the short interest in a symbol using any of a number of tools, such as Nasdaq's here.  This is often cited as an indicator similar to what you proposed, though I don't know how helpful it would be from an intra-day perspective. Yes, http://shares.telegraph.co.uk/stockscreener/ has what you're looking for. "A ""stock price"" is nothing but the price at which some shares of that stock were sold on an exchange from someone willing to sell those shares at that price (or more) to someone willing to buy them at that price (or less). Pretty much every question about how stock prices work is answered by the paragraph above, which an astonishingly large number of people don't seem to be aware of. So there is no explicit ""tracking"" mechanism at all. Just people buying and selling, and if the current going price on two exchanges differ, then that is an opportunity for someone to make money by buying on one exchange and selling on the other - until the prices are close enough that the fees and overhead make that activity unprofitable. This is called ""arbitrage"" and a common activity of investment banks or (more recently) hedge funds and specialized trading firms spun off by said banks due to regulation." "Considering the fact that you are so unaware of how to find such data, I find it very very hard to believe that you actually need it. ""All trade and finance data for as much tickers and markets as possible."" Wtf does that even mean. You could be referencing thousands of different types of data for any given ""ticker"" with a statement so vague. What are you looking for?"