Why does historical price data not go back all the way on Google Finance?
Google Finance and Yahoo Finance have been transitioning their API (data interface) over the last 3 months. They are currently unreliable. If you're just interested in historical price data, I would recommend either Quandl or Tiingo (I am not affiliated with either, but I use them as data sources). Both have the same historical data (open, close, high, low, dividends, etc.) on a daily closing for thousands of Ticker symbols. Each service requires you to register and get a unique token. For basic historical data, there is no charge. I've been using both for many months and the data quality has been excellent and API (at least for python) is very easy! If you have an inclination for python software development, you can read about the drama with Google and Yahoo finance at the pandas-datareader group at https://github.com/pydata/pandas-datareader.
I dont know if this data is available for the 1980s, but this response to an old question of mine discusses how you can pull stock related information from google or yahoo finance over a certain period of time. You could do this in excel or google spreadsheet and see if you could get the data you're looking for.  Quote from old post: Google Docs spreadsheets have a   function for filling in stock and fund   prices. You can use that data to graph (fund1   / fund2) over some time period. "Because Google recently decided that they will not provide Maps for free to partners who use the data, and Apple was the largest Maps user.   Cutting the Apple created Maps app that used Google data and forcing Google to release their own app basically means Google goes from cashing checks from Apple to having to create and support an app all on their own dime.  Also, do you want to guess why Apple Maps w/ Google data didn't have features like Turn by Turn Navigation? If you guessed ""Google didn't allow Apple to have it"", you guess right.   Apple had to do it not only to try and reach feature parity, but to prevent themselves from having to pay their biggest competitor to use Maps data." "I was not aware of that.  However, the rest of that article seems to point in Google's favor.  &gt; The public suffers under a monopolistic market because it does not have the quantity of goods or the low prices that a competitive market could offer.  Doesn't apply.  &gt; ...the act only applies to those monopolies attained through abused or unfair power. Monopolies that have been created through efficient, competitive behavior are not illegal under the Sherman Act, as long as honest methods have been employed.  Google may have 65% of the share of internet searches, but not the online travel booking business.  You can't say they've cheated to win the search market, and you can't say they have a monopoly in the online travel booking business.  &gt; Once sufficient monopoly power has been proved, the Sherman Act requires a showing that the company in question engaged in unfair conduct.  Finally, even if they were somehow declared a monopoly, you'd have to prove they were being unfair to competitors.  Eliminating competitors from search results might be unfair, but just listing your own product at the top of the list seems a fairly weak argument.  If the government says that Google's product at the top of the list is unfair, questions will then be raised about the entire order of the list.  How far down should Google's listings be?  Is this going to spread to all of Google's side-projects that show up in their search results?  What if Google placed their listing in the paid advertising section?  Is that still ""cheating""?  Does a company not have the right to show new products to its existing customers?  I don't see Google losing this battle in court, but then, I don't even see it going to court.  Google will go out of its way to appease the complainers." You can easily build a Google Sheet spreadsheet to track what you want as Sheet has a 'googlefinance()' function to look-up the same prices and data you can enter and track in a Google Finance portfolio, except you can use it in ways you want. For example, you can track your purchase price at a fixed exchange rate, track the current market value as the product of the stock's price times the floating exchange rate, and then record your realized profit and loss using another fixed exchange rate.  You don't have to record the rates either, as googlefinance() func is able to lookup prices as of a particular date. You can access Google Sheet through a web browser or Android app. "The CBOE states, in an investor's guide to Interest Rate Options: The Options’ Underlying Values   Underlying values for the option contracts are   10 times the underlying Treasury yields (rates)—   13-week T-bill yield (for IRX), 5-year T-note   yield (for FVX), 10-year T-note yield (for TNX)   and 30-year T-bond yield (for TYX). The Yahoo! rate listed is the actual Treasury yield; the Google Finance and CBOE rates reflect the 10 times value.  I don't think there's a specific advantage to ""being contrary"", more likely it's a mistake, or just different." http://www.pacificrubiales.com/investor-relations/reports.html does have financial reports on their website for the example you list.  There is the potential for some data to not be easily imported into a format that Yahoo! Finance uses would be my guess for why some data may be missing though an alternative explanation for some companies would be that they may not have been around for a long enough time period to report this information,e.g. if the company is a spin-off of an existing company. https://www.hussmanfunds.com/wmc/wmc171009m.png  &gt;The following charts will provide a sense of where the U.S. equity market currently stands. The first chart shows our margin-adjusted CAPE, which as noted above has a correlation of about -0.89 with actual subsequent market returns across U.S. market cycles since the 1920’s.  https://www.hussmanfunds.com/wmc/wmc171009.htm  It will turn, downside potential is historic. "Company values (and thus stock prices) rely on a much larger time frame than ""a weekend"".  First, markets are not efficient enough to know what a companies sales were over the past 2-3 days (many companies do not even know that for several weeks).  They look at performance over quarters and years to determine the ""value"" of a company.  They also look forward, not backwards to determine value.  Prior performance only gives a hint of what future performance may be.  If a company shut its doors over a weekend and did no sales, it still would have value based on its future ability to earn profits."