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To begin with, every company listed on a stock exchange is sufficiently notable for inclusion.
Actually, every company we can substantially, reliably, independently source material for an article about is notable enough for inclusion. That, and not something else. The sub-guidelines do nothing but either exclude too much (otherwise sourceable articles are excluded) or in many cases -include- too much (garbage, unsourceable articles are tolerated because technically "it's an album from a notable band" or "he plays third-string whatever for some pro team"). We need a less-squishy definition of what constitutes substantial independent reliable sourcing, we need to stick to it, and we need to get rid of the sub-guidelines. That would improve notability more than anything.