# Signals - Historic universe tickers **URL:** \ **Category:** Tournament\ **Created:** [May 13, 2021, 2:57am UTC](https://forum.numer.ai/t/signals-historic-universe-tickers/3280 "2021-05-13T02:57:58Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![sirbradflies](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.numer.ai/sirbradflies/32/2835_2.png) [@sirbradflies](https://forum.numer.ai/u/sirbradflies)\ **Post date:** [May 13, 2021, 2:57am UTC](https://forum.numer.ai/t/signals-historic-universe-tickers/3280/1 "2021-05-13T02:57:58Z")
Hi, Is it possible to get the historic version of the Signals ticker mapping (e.g. 2010, 2011, …) to avoid survivorship bias? I am just realizing how wrong is to use the current ticker map to train the model… I could not find this topic referred else and it would be very helpful to have the past mappings or maybe a free source where we can find the top 5000 global public companies by market capitalization by year. Thanks! ---
**Author:** ![richai](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.numer.ai/richai/32/2493_2.png) [@richai](https://forum.numer.ai/u/richai)\ **Post date:** [May 13, 2021, 6:01am UTC](https://forum.numer.ai/t/signals-historic-universe-tickers/3280/2 "2021-05-13T06:01:02Z")
Have you tried downloading the example files (near upload button)? In the folder, there is a file called example\_signal\_upload.csv. This file contains tickers for the whole validation data since 2013/01/04 - all these historical tickers wouldn’t have survivorship bias; these were all the things in our universe at those times. Is this what you need? ---
**Author:** ![sirbradflies](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.numer.ai/sirbradflies/32/2835_2.png) [@sirbradflies](https://forum.numer.ai/u/sirbradflies)\ **Post date:** [May 14, 2021, 1:52am UTC](https://forum.numer.ai/t/signals-historic-universe-tickers/3280/3 "2021-05-14T01:52:06Z")
Hi Richard, I missed that file, thanks! I did a quick check of the file and I did not see in the past years some companies that got delisted afterwards (e.g. Blockbuster BBI). Am I missing something? I would have expected to see them in the historic universe. Thanks again ---
**Author:** ![sirbradflies](https://yyz1.discourse-cdn.com/flex009/user_avatar/forum.numer.ai/sirbradflies/32/2835_2.png) [@sirbradflies](https://forum.numer.ai/u/sirbradflies)\ **Post date:** [May 14, 2021, 2:07am UTC](https://forum.numer.ai/t/signals-historic-universe-tickers/3280/4 "2021-05-14T02:07:39Z")
Nevermind, I did a sanity check with Lehman Brothers (LEH US) and it stops on September 2008 as expected. This is exactly what I was looking for.