# Alpaca volumes question - off from brokerages and yahoo by 25%?
**URL:** https://forum.alpaca.markets/t/alpaca-volumes-question-off-from-brokerages-and-yahoo-by-25/10620
**Category:** Alpaca Market Data
**Created:** [September 17, 2022, 6:06pm UTC](https://forum.alpaca.markets/t/alpaca-volumes-question-off-from-brokerages-and-yahoo-by-25/10620 "2022-09-17T18:06:47Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Homer](https://forum.alpaca.markets/u/Homer)
#### Post date: [September 17, 2022, 6:06pm UTC](https://forum.alpaca.markets/t/alpaca-volumes-question-off-from-brokerages-and-yahoo-by-25/10620/1 "2022-09-17T18:06:47Z")
hello. i have a volume question. when i add up the volume on, say SPY, for 2022-09-16 looking through the history of trades on that day then i end up somewhere around 80 million shares. And, that is before excluding the types of trade conditions alpaca excludes per exchange rules (e.g. M,Q,8,9) on when to add to the volume count so it would even less. now if you go over to yahoo and look at their volume for that day you see 103 million as well as ToS’s app and other brokerage apps. i added volumes from scanning SIP, OTC, and IEX as well.
im simply looking at shares per trade in all trades. volumes are off by 25% ?
am i missing something here?
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### Author:  [@Homer](https://forum.alpaca.markets/u/Homer)
#### Post date: [September 18, 2022, 3:18am UTC](https://forum.alpaca.markets/t/alpaca-volumes-question-off-from-brokerages-and-yahoo-by-25/10620/2 "2022-09-18T03:18:00Z")
im adding a link to another post someone had a while back of a similar question. for reference only. i still have my questions above.
> [@Accuracy of streaming / real-time volume and vwap](https://forum.alpaca.markets/t/accuracy-of-streaming-real-time-volume-and-vwap/7972):
>
> Hi, I have pro subscription and noticed that streaming data of stocks are not accurate. I used Yahoo Finance API and TC2000 to get real-time data of e.g., a stock like MSFT. I noticed that the Volume value of Alpaca is usually less than volume value which I get from Yahoo Finance and TC2000. Therefore, VWAP is also wrong and does not match with VWAP of TC2000. Why it is like this? Do I do something wrong? api.get\_latest\_bar(“msft”)