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For information, on a French forum, someone explained to me that in NDX case, the volume is calculated by taking into account the weight of each security in the index (because of the "market cap weighted nature" of the index). This is not the case for Dow Jones (DJI). I have checked for the 30...

Ok it's noted : many ways to determine the volume, also depending on the time interval they use for this data. Can I ask you how do you do to record yourself the volume ? Thanks a lot.

Thank you, especially for helping me having a better understanding of the markets. Please correct me when I'am wrong. I've been there : https://www.bats.com/us/equities/market_share/ Here are listed 3 of the biggest exchanges + others : -NYSE with their 3 platforms -NASDAQ with their 3...

I don't know, or maybe this free data is erroneous ..? I don't really know about options but I would be surprised seeing stock transactions through options being 3 times greater than direct simple stock transactions..

Hi, I don't understand why the volume for NDX (Nasdaq-100 index) is 1 964 590 000 here on yahoo finance on August 18 : https://fr.finance.yahoo.com/quote/%5ENDX/history?p=%5ENDX Because when I compute each stock volume (still August 18) on Excel (107 components) listed on NDX one by one and...