Lazy Search: Looking for Historical Market Cap Data

Anyone have any ideas for where I might find good historical market capitalization data? Specifically, I’m trying to find historical figures on the numbers of companies in each major market cap by decade, ranging across micro, small, mid, large, and so on.

I thought I could get that sort of thing from the NYSE FactBook, but apparently now. Anyone have any ideas?


  1. kolmstead says:

    I’ve run into this problem before. My only solution is the WRDS database. You might be able to cobble something together from AAII’s Stock Investor Pro data as well. Unfortunately yahoo doesn’t provide historical shares outstanding so the perl modules are of no use.

  2. Jerry V. says:

    How far back are you looking to go?

  3. As far back as I can :-) Somewhat more seriously, I’d like to get back at least a few decades.

  4. One Way Stox says:

    Paul, this is a great question

  5. Did either of you ever find a reliable way to get this data? I am a consultant and have been tasked with a project to track 20-year market cap data for the top 6 medical device and pharma companies. Did you have any luck? Thanks!