Mega cap

Mega cap describes the very largest publicly traded companies by market capitalisation, typically several hundred billion dollars or more. It sits at the top of a ladder of size categories that also includes large cap, mid cap, small cap, and micro cap.

Size affects far more than which basket a company gets sorted into. It changes negotiating power, access to capital, and how much room is realistically left to keep growing at a fast pace, a $30 billion company can double its revenue in a way a $2 trillion company simply cannot. That is why size is one of the checks to make before treating two companies as genuine peers for valuation purposes, even when the businesses look similar on paper.