Shares of Square Inc. are down 8.5% in Tuesday trading and on pace for their worst day since November. If current losses hold, it would mark Square stock's third largest single-day percentage drop since the company went public in 2015. Shares closed down 16% on Nov. 27. Despite Tuesday's drop, the stock is still up 32% so far this year and 157% over the past 12 months, outpacing gains in the S&P 500 Some analysts have expressed concern over the company's support for Bitcoin transactions, as the price of Bitcoin has sharply declined in price over the course of 2018, while others have praised the company's fast-growing business services segment. Square is due to report March-quarter earnings on May 2.