Shares of e.l.f. Beauty, Inc. (NYSE: ELF), a multi-channel brand retailer and distributor of high-quality cosmetic and skin care products, plunged 28% as of 1:38 p.m. EDT Thursday after announcing second-quarter earnings.Revenue during the second quarter increased 6% to $59.1 million, compared to the prior year, which was in line with analysts' estimates.