A pure-play company has a single business focus. Ballard Power Systems
Until it was snapped up by Unilever
When investors are drawn to a particular kind of business, they may seek out a company that's a pure play so their invested dollars won't be spread out over other less desirable business segments. Of course, it can also make sense for investors to favor some conglomerates because of their diversification. If one business line falters, others will bolster the company.