Hi
I have been trying to set my pipeline screen to the top-250 market cap equities.
When running the pipeline, I noticed that only about 160 assets are passed.
Any explanation? Is the above python statement wrong?
Equities trading universe by market cap problem
Everything looks fine with the code. The reason you are getting less than 250 is that many stocks, and even quite large stocks, are not included in the QTU for various reasons. A few examples.
SAP, BUD, BABA are all big companies but excluded because they are ADRs
GOOG_L, BRK_A, GS_PRK are again all big companies but they have multiple share classes and these are not the primary share class.
There are a few other reasons some stocks are excluded but these are the two big ones. Take a look here for the definition of the QTU.
To get the top 250 stocks by market cap which are in QTradableStocksUS do something like this
qtu_top_250 = MarketCap().top(250, mask=QTradableStocksUS())
Using the mask parameter will first filter the top method to only those stocks in the QTU.
Attached is a notebook showing how many stocks this impacts.
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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by Quantopian.
In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances.