Comparative Analysis of Limit Order Book Dynamics between the Nairobi Securities Exchange and Major Global Exchanges: Insights into Liquidity, Volatility, and Market Efficiency

This paper presents a comprehensive, high-frequency comparative analysis of limit order book (LOB) dynamics between the Nairobi Securities Exchange (NSE) and three major global exchanges: the New York Stock Exchange (NYSE), London Stock Exchange (LSE), and Johannesburg Stock Exchange (JSE). Framed within the theoretical lens of market microstructure, the study utilises millisecond-level message data from the 2022–2023 period to evaluate critical market quality indicators, including liquidity provision, intraday volatility, order book resiliency, and informational efficiency. Drawing on a robust dataset of order submissions, executions, cancellations, and modifications, the analysis reveals that the NSE consistently underperforms across all observed dimensions. Average bid–ask spreads are considerably wider, top-of-book depth is significantly shallower, and post-shock resiliency lags substantially—often exceeding 30 seconds compared to less than five seconds on the NYSE and JSE. Furthermore, the NSE exhibits persistently high levels of order flow toxicity, as measured by the Volume-Synchronized Probability of Informed Trading (VPIN), suggesting inefficiencies in price discovery and heightened exposure to asymmetric information. These disparities are not merely technological in nature but reflect deeper institutional limitations—including the absence of high-frequency trading infrastructure, inadequate market surveillance systems, and limited regulatory incentives for liquidity provision. By comparing the NSE with more advanced and better-regulated peers, this study underscores the impact of structural design and participant sophistication on market function. The findings have strong implications for capital market reform in frontier economies. The study advocates for targeted interventions such as dynamic tick-size regimes, mandatory quoting obligations, co-location services, and real-time microstructure monitoring. These reforms, if carefully implemented, could significantly enhance the NSE's depth, transparency, and resilience. This research contributes original empirical evidence to the evolving discourse on market quality in developing financial systems. It offers both academic and policy-relevant insights, serving as a foundation for further inquiry into emerging market structures and the evolving dynamics of modern electronic trading environments.