
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?
A free charting tool became a broker, a clearing stack and, eventually, the bridge Kraken wanted between crypto and regulated futures. The clever part was not the candlesticks. It was owning more of what happened after a trader clicked buy.