
NinjaTrader’s founder built software for people who wanted to examine every tick. His career traces what happens when a trading tool grows into the business behind the trade.

From Irishjobs.com to OppFi's public listing and NinjaTrader's $1.5 billion combination with Kraken, O'Reilly has kept returning to the same question: can growth be measured, diversified and made useful to the customer?