How traders made a fortune on the Covid crash

This is the story about the most eventful trading day in my entire 15 year career working in the quant trading industry. As with most people with long careers in quant finance, the most exciting day of their entire career was the day when Covid truly materialized and crashed the stock market more than 10% in a single day.

Disclaimer: This story is about a fictitious trading firm. All numbers are made up, and any similarities to any existing trading firms are purely a coincidence.