Is a stock's price different across trading platforms?

External question — Personal Finance Stack Exchange Author: user63150 Original post: https://money.stackexchange.com/questions/119853 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Let's say I'm looking at a minute stock chart during a trading day. Will E-Trade and TD-Ameritrade for example, show a different price on the minute by minute chart? (or 5-minute chart, etc.)

External answer — Personal Finance Stack Exchange Author: TomTom Original post: https://money.stackexchange.com/a/119858 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Will E-Trade and TD-Ameritrade for example, show a different price on the minute by minute chart? It is possible they show different charts, but this is not the same question as Is a stock's price different across trading platforms? because a different price may simply be an issue i.e. of time being off on a server. There is a lot of technology that can go wrong. Price between platforms that follow the same rule SHOULD be identical, but it may differ base on technological issues between platforms (i.e. a data feed is out because a router failed, i.e.).

External answer — Personal Finance Stack Exchange Author: Bob Baerker Original post: https://money.stackexchange.com/a/119863 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. A one minute chart is a effectively a derivative of price because the provider is collating 60 seconds of data and creating a data point. It's very reasonable to expect that one platform may do this faster than another. It's also possible that other technology issues can add a tiny delay to the process (server speed, clock issues, starting/ending point of the minute, etc.). One would expect that the current trade price/volume info for two platforms should be identical but I can attest to the fact that it's not. Occasionally, I have seen one of my brokers lag another by a second or two. And if I'm seeing it on the few stocks that I'm intently watching at a given moment, it must be happening an awful lot since there are many, many thousands of stocks trading.

External answer — Personal Finance Stack Exchange Author: Michael Stephens Original post: https://money.stackexchange.com/a/133912 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I thought that maybe it was due to different platforms relying on a small set of different data providers. For example, yesterday the question came up and I checked the first 1-min bar on AMZN and found that TOS/TDA and Barchart were nearly identical, while there was a significant difference between them and TradingView, and Yahoo was way out there with 3176.25 for OHL&C. TDA TradingView Barchart Yahoo O 3176.00 3175.22 3176.01 3176.25 H 3178.97 3175.22 3178.97 3176.25 L 3172.00 3173.76 3172.00 3176.25 C 3176.25 3173.77 3176.25 3176.25