What happens when strong stocks gap down at the open? A well-known trading strategy is to buy the gap, expecting mean reversion. This post uses Zipline to explore down gaps and finds a profitable strategy based on selling, not buying, the gap.

Classic pairs trading strategies have suffered deteriorating returns over time. Can a research pipeline that facilitates the identification and selection of ETF pairs make pairs trading viable again? This post investigates such a pipeline.

Do intraday strategies have a place in the portfolios of long-term investors and fund managers? This post explores an intraday strategy that works best in high volatility regimes and thus makes an attractive candidate for hedging long-term portfolio risk.

Does forced buying and selling of underlying shares by leveraged ETF sponsors cause predictable intraday price moves? This post explores an intraday momentum strategy based on the premise that it does.

Many quantitative trading strategies thrive in high volatility regimes, while other trading strategies work best in low volatility regimes. So which global markets are the most and least volatile? This post compares the daily, overnight, and intraday volatility of 17 countries.

If you're a short seller exploring global markets, a good first question to ask is: are there shares available to borrow? This post looks at the percentage of stocks that are shortable through Interactive Brokers in each of 17 countries.

The US stock market is the largest and most liquid stock market in the world and tends to get all the attention. Many brokers and trading platforms are US-only, and many traders focus exclusively on the US market.

This post compares the number of stock listings in each of 17 countries to quantify what traders miss out on by ignoring the rest of the world.