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I have a question regarding differing stock volume amounts for a specific stock reported on various financial websites. For example, let's take a look at Lockheed Martin's volume amount at 12-12-2016.

Yahoo Finance: 7 080 300
https://finance.yahoo.com/quote/LMT/history?period1=1481238000&period2=1481583600&interval=1d&filter=history&frequency=1d

Google Finance: 7 080 271
https://www.google.com/finance/historical?cid=21553&startdate=Dec+9%2C+2016&enddate=Dec+13%2C+2016&num=30&ei=wrWEWIGdIMWCswHOr4No

Stock Market Watch: 7 079 560
"You need at least 10 reputation to post more than 2 links."

and finally the Lockheed Martin's official website: 7 078 760
"You need at least 10 reputation to post more than 2 links."

My guess is that it perhaps could be a result of some data providers including pre-market and after-hours trading into the calculation of the volume but still, 4 different numbers?

I hope someone can explain this. Thank you in advance.

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  • $\begingroup$ Despite a lot of effort put into finding the answer to my question, I still have not been able to satisfactorily answer it. $\endgroup$ – yssup Feb 2 '17 at 22:13

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