Google provides historical stock prices traders can study or use to create a personalized portfolio tracker 

Anyone with a Google account can easily download historical stock prices for free.  

First, head to Google’s version of a spreadsheet, Google Sheets, and start a new document:

In Cell A1, type the following and then hit “enter”:

=GOOGLEFINANCE (“SPY”, “all”, “2020-01-01”, “2020-10-09”, “daily”).

The daily OHLC (open, high, low and close) prices and volume for the symbol SPY from Jan. 1, 2020 to Oct. 9, 2020 will appear. See below:

To avoid manually posting start and ending dates and instead get the last month’s worth of data, use the command in Cell A1:

=GOOGLEFINANCE (“SPY”, “all”, edate(today(), -1), today(), “daily”).

Traders can conduct studies with this historical data, and they can also create a personalized portfolio tracker in Google using real-time (or near real-time) prices.  

Starting in Column A, create a header and then list the portfolio holdings. Next, in Cell B2, type: 

=GOOGLEFINANCE (A2, “price”).

This will reference the symbol entered in column A2 and get the last price. To get the daily price change, in Cell C2, type:

 =GOOGLEFINANCE (A2, “change”)

In Cell D2, type in the number of shares held. In Cell E2, multiply the last price by the shares held: 

=B2 * D2.

Lastly, in Cell F2, multiply daily change of the symbol in Cell C2 by the number of shares held in D2:

= C2 * D2.

That creates a simple portfolio tracker, and traders can make multiple variations. 

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Michael Rechenthin, Ph.D., aka “Dr. Data,” is the head of data science at tastytrade. @mrechenthin