Market Capitalization

Your browser draws charts of market capitalization of four publicly traded corporations using live data from Yahoo Finance. The implementation uses HTML canvas elements. The capitalization change is reflected with proportional areas (not radius.)

The dates and the stocks can be changed, please keep the date format and specify a valid stock symbol. Values are cached for a little while within your browser.

Hat tip to FT Alphaville and JP Morgan Chase for the original graphs.

This page requires a recent decent browser supporting HTML 5 like Mozilla FireFox, Google Chrome, Apple Safari, or Opera. IE users can read about this situation here and here.

This proof of concept is very simple and probably quite inaccurate. For example it assumes the number of shares stayed the same (because this isn't available on GF historic reports.)  Your suggestions are welcome.

Creative Commons License
Market Capitalization, Now and Then by Alejo Sanchez is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Based on a work at