I'm not familiar with the UI of financial software, sorry. But can I ask what a power user in your example would be looking for in a screen like this? Like are they watching the screen for movement, color, ordering, something else...?
The most similar things I've worked on were dashboards and spreadsheets, but in those cases, we put a lot of thought into information hierarchy and organization, not just flat density.
For example, we'd hide what we could behind traffic status lights ; if all systems were green, you're good, and you'd only need to dig deeper into ones outside the norm that were yellow or red.
Or where the metric itself is important and shouldn't be hidden, we'd still try to highlight changes over time with sparklines or conditional color scales.
Basically just try to guide the report viewer's attention towards the most important things, whether it's "this is broken!" or "whoa, this number changed a lot over the last 24 hours".
Even in a spreadsheet, there'd be sparklines and cell formatting and subtotals and totals and such to highlight the important stuff.
I can't think of a situation where I'd want to see a bunch of peer numbers like this with no hierarchy. I'm not really comparing them against each other, am I, but probably trying to see change over time...?
But anyway, I honestly don't know (and am curious about) how this works in the financial sector. Are traders really just manually looking at all these numbers all the time (and doing what with them, trying to remember what they were some time ago?)?