Thank you Mike and Diego. Both of your answers were interesting and I plan on checking both of them. I find it interesting that Mike had to go look for quite a while before finding out the answer to this question. As someone more familiar and expert with procedural and Object-Oriented languages, I think that in Mathematica's documentation, when documenting a function, they should have a section showing exactly how the output is structured and give examples on how to access any particular member (in Object-Oriented parlance) one wishes to obtain. I still find the information from Mathematica, counter-intuitive. It seems one has to try a lot of things before finally understanding what the output looks like. That would explain why Mike had to "spent a lot of time digging into the docs of TemporalData and TimeSeries". I suspect I will have to do the same, but at least I now know where to look for. Mike's approach seems to require using "Head" and then having to go research whatever that returns, in his case, TemporalData. In Diego's answer, I get that you can get an idea of what is in the returned data (all those fields should, in my opinion, be in the documents. How am I to know that there are all those fields that I could ask about. Again, in my opinion, this is something that should be in the docs. But, I'm new (again) here and will go ahead an try both Mike's and Diego's suggestions. Now, I asked my notebook to go get "data = FinancialData[stock, "OHLCV", dateRange] // AbsoluteTiming;" and that is taking minutes upon minutes. But that is another story.

Thank you Mike and Diego for your replies. Henrick

Hi Henrick,

With many constructs in WL such as Dataset, TimeSeries, ConditionalExpression, GraphicsComplex... it is often more convenient to work with the Normal representation. Take a look at

(ge = FinancialData["GE", "OHLCV", DayPlus[Today, -10]]) // Normal

Hi Henrick,

If you are just interested in the highs then this is one way

FinancialData["GE", "High", DayPlus[Today, -10]]["Values"] // Normal

Each element in the list is a Quantity with units of "USDollars". To get the raw numbers without the units

FinancialData["GE", "High", DayPlus[Today, -10]]["Values"] // Normal // QuantityMagnitude

Hi Henrick,

Currency quantities can be compared, even for different currencies (current exchange rate is used). e.g.

d1 = Quantity[10, "USDollars"];
d2 = Quantity[100, "USDollars"];
d3 = Quantity[10, "Euros"];

d2 > d1
(* True *)

d3 < d1
(* False *)

As a general answer, just call Head on an interesting value returned from the function.

Let's look at GE...

ge = FinancialData["GE", "OHLCV", DayPlus[Today, -10]];
ge // Head

returns

TemporalData

The documentation for Temporal Data tells us how to pull the data out. For example:

ge["PathComponents"]

returns a list of 5 TimeSeries. Unless things have changed (which they might have, so please verify), I believe that these TimeSeries are the Open, High, Low, Close and Volume data, in that order.

When I was looking into this a few months ago, I spent a lot of time digging into the docs of TemporalData and TimeSeries.

Good luck.