The major stock exchanges with an official lunch close are the Shanghai Stock Exchange (SSE), the Tokyo Stock Exchange (TSE/TYO), the Shenzhen Stock Exchange (SZSE), and the Stock Exchange of Hong Kong (SEHK). The London Stock Exchange (LSE) has a two-minute break at noon. Its traders don’t eat that fast. The mini-break is designed to protect institutional traders from high-frequency traders, whose split-second transactions can skew prices.