How can I find data on delisted stocks?
You need a source of delisted historical data. Such data is typically only available from paid sources. According to my records, AULT (Ault Inc) began as an OTC stock in the 1980s prior it having an official NASDAQ listing.  It was delisted on 27 Jan 2006.  Its final traded price was $2.94.  It was taken over at a price of $2.90 per share by SL Industries. Source: Symbol AULT-200601 within Premium Data US delisted stocks historical price data set available from http://www.premiumdata.net/products/premiumdata/ushistorical.php Disclosure: I am a co-owner of Norgate / Premium Data. In general you cannot. Once the security is no longer listed on the exchange - it doesn't have to provide information to the exchange and regulators (unless it wants to be re-listed). That's one of the reasons companies go private - to keep their (financial and other) information private. If it was listed in 1999, and is no longer listed now - you can dig through SEC archives for the information. You can try and reach out to the company's investors' relations contact and see if they can help you with the specific information you're looking for.
You'd have to buy that information. Quoting from this page, Commercial Historical Data Higher resolution and more complete datasets are generally not available for free. Below is a list of vendors which have passed our quality screening (in total, we screened over a dozen vendors). To qualify, the vendor must aggregate data from all US national/regional exchanges as only complete datasets are suitable for research use. The last point is especially important as there are many vendors who just get data from a couple sources and is missing important information such as dark pool trades. They offer some alternatives for free data: Daily Resolution Data 1) Yahoo! Finance– Daily resolution data, with split/dividend adjustments can be downloaded from here. The download procedure can be automated using this tool. Note, Yahoo quite frequently has errors in its database and does not contain data for delisted symbols. 2) QuantQuote Free Data– QuantQuote offers free daily resolution data for the S&P500 at this web page under the Free Data tab. The data accounts for symbol changes, splits, and dividends, and is largely free of the errors found in the Yahoo data. Note, only 500 symbols are available unlike Yahoo which provides all listed symbols. And they list recommendations about who to buy the data from. Ya, that's a lot of data - especially considering your relative lack of experience and the likely fact that you have no idea what to do with what you're given.  How do you even know you need minute or tick-based bid-ask data?    You can get a lot more than OHLC/V/Split/Dividend.  You can get:  * Book Value; * Dividend information (Amount, yield, ex date, pay date); * EBITDA; * EPS (current AND estimates); * Price/sales ratio; * Price/book value; * Price/earnings ratio; * PEG ratio; * Short ratio; * Market cap.  Among other things, all for free. "You could use any of various financial APIs (e.g., Yahoo finance) to get prices of some reference stock and bond index funds.  That would be a reasonable approximation to market performance over a given time span. As for inflation data, just googling ""monthly inflation data"" gave me two pages with numbers that seem to agree and go back to 1914.  If you want to double-check their numbers you could go to the source at the BLS. As for whether any existing analysis exists, I'm not sure exactly what you mean.  I don't think you need to do much analysis to show that stock returns are different over different time periods." About 10 years ago, I used to use MetaStock Trader which was a very sound tool, with a large number of indicators, but it has been a number of years since I have used it, so my comments on it will be out of date. At the time it relied upon me purchasing trading data myself, which is why I switched to Incredible Charts. I currently use Incredible Charts which I have done for a number of years, initially on the free adware service, now on the $10/year for EOD data access. There are quicker levels of data access, which might suit you, but I can't comment on these. It is web-based which is key for me. The data quality is very good and the number of inbuilt indicators is excellent. You can build search routines on the basis of specific indicators which is very effective. I'm looking at VectorVest, as a replacement for (or in addition to) Incredible Charts, as it has very powerful backtesting routines and the ability to run test portfolios with specific buy/sell criteria that can simulate and backtest a number of trading scenarios at the same time. The advantage of all of these is they are not tied to a particular broker. If you're researching a publicly traded company in the USA, you can search the company filings with the SEC. Clicking 'Filings' should take you here. "Assuming that the ETF is tracking an index, is there a reason for not looking at using details on the index?  Typically the exact constituents of an index are proprietary, and companies will not publish them publicly without a license.  S&P is the heavyweight in this area, and the exact details of the constituents at any one time are not listed anywhere.  They do list the methodology, and announcements as to index changes, but not a full list of actual underlying constituents. Is there a easy way to automatically (ie. through an API or something, not through just reading a prospectus) get information about an ETF's underlying securities? I have looked for this information before, and based on my own searches, in a word: no.  Index providers, and providers of APIs which provide index information, make money off of such services.  The easiest way may be to navigate to each provider and download the CSV with the full list of holdings, if one exists.  You can then drop this into your pipeline and write a program to pull the data from the CSV file.  You could drop the entire CSV into Excel and use VBA to automagically pull the data into a usable format. For example, on the page for XIU.TO on the Blackrock site, after clicking the ""All Holdings"" tab there is a link to ""Download holdings"", which will provide you with a CSV.  I am not sure if all providers look at this. Alternatively, you could write the ETF company themselves." A public company should have a link for investor relations, which should help provide a trail of basis if this is a matter of company buyout, takeover, etc.  This gets you close, but if you don't have an exact date, it will just be close, not exact.  One clean way out of this, assuming the goal is to get rid of the stock and move on, is to donate the shares to charity. You will take the present value as a deduction, and be done. You can use a charitable gift fund such as those offered by Schwab or Fidelity, so if say, the shares are worth $20K, and you typically donate $5K per year, the fund lets you do this transaction at once, then send to the charities you wish over the next few years. You have not lost value. It is just that the shares you owned, are now not tradable on US stock exchanges. You still have the value of your shares protected. In cases like de-listing of a stock, typically a trust (may be managed by a bank) is setup to help customers liquidate their stocks. You should try to search the relevant SEC filings for de-listing of this stock to get more details on whom to contact. I agree that a random page on the internet is not always a good source, but at the same time I will use Google or Yahoo Finance to look up US/EU equities, even though those sites are not authoritative and offer zero guarantees as to the accuracy of their data. In the same vein you could try a website devoted to warrants in your market.  For example, I Googled toronto stock exchange warrants and the very first link took me to a site with all the information you mentioned.  The authoritative source for the information would be the listing exchange, but I've spent five minutes on the TSX website and couldn't find even a fraction of the information about that warrant that I found on the non-authoritative site. "The mathematics site, WolframAlpha, provides such data. Here is a link to historic p/e data for Apple. You can chart other companies simply by typing ""p/e code"" into the search box.  For example, ""p/e XOM"" will give you historic p/e data for Exxon. A drop-down list box allows you to select a reporting period : 2 years, 5 years, 10 years, all data.  Below the chart you can read the minimum, maximum, and average p/e for the reporting period in addition to the dates on which the minimum and maximum were applicable." Robert Shiller published US Stock Market data from 1871.  Ken French also has historical data on his website.  Damodaran has a bunch of historical data, here is some historical S&P data. You won't be able to know the trading activity in a timely, actionable method in most cases. The exception is if the investor (individual, fund, holding company, non-profit foundation, etc) is a large shareholder of a specific company and therefore required to file their intentions to buy or sell with the SEC. The threshold for this is usually if they own 5% or greater of the outstanding shares. You can, however, get a sense of the holdings for some of the entities you mention with some sleuthing. Publicly-Traded Holding Companies Since you mention Warren Buffett, Berkshire Hathaway is an example of this. Publicly traded companies (that are traded on a US-based exchange) have to file numerous reports with the SEC. Of these, you should review their Annual Report and monitor all filings on the SEC's website. Here's the link to the Berkshire Hathaway profile. Private Foundations Harvard and Yale have private, non-profit foundations. The first place to look would be at the Form 990 filings each is required to file with the IRS. Two sources for these filings are GuideStar.org and the FoundationCenter.org. Keep in mind that if the private foundation is a large enough shareholder in a specific company, they, too, will be required to file their intentions to buy or sell shares in that company. Private Individuals Unless the individual publicly releases their current holdings, the only insight you may get is what they say publicly or have to disclose — again, if they are a major shareholder. You're only counting one year.   Let's say 30 years of data, minutewise, for 2,000 stocks, and 50 characters per data line. That's 1.5TB of data.  Since the market has grown, that's an overestimate - 30 years ago there weren't 2,000 stocks in the NYSE - but it still gives us ballpark of roughly 1 TB.  Not an easy download. I already know of this method. I was creating a peer group and found 4-5 very similar companies, however one of them is a foreign public company with a subsidiary competing directly with a company I am trying to find the beta for. I guess I have to omit this company because it's strictly foreign?   Also, what do I do if I can't find any public companies that are similar to the company I am trying to value? I am mostly interested in day to day records, and would like the data to contain information such as dividend payouts, and other parameters commonly available, such as on : http://finviz.com/screener.ashx ... but the kind of queries you can do is limited. For instance you can only go back two years.