Our experimental discovery of a quantum nematic phase in the colossal magnetoresistive material EuB₆ constitutes a breakthrough in quantum material research. Unlike the quantum nematics in the cuprate and arsenide superconductors, there is no nearby lattice instability complicating the interpretation, making EuB₆ a clean model system for studying electronic nematicity. Interestingly, the nematic appears in the same region of the temperature-magnetic field phase diagram where experiments indicate magnetic polarons. This not only indicates a new understanding of nematicity but also paves the way for obtaining novel magnetoresistive transistor action in spintronic devices.