An architect of the biggest US dark pools is joining one of the bank-owned trading venue's primary competitors, Nasdaq OMX, to oversee sales of its stock trading technology products.

Credit Suisse veteran Manny Santayana will start work at Nasdaq next year, reporting to Eric Noll, the exchange operator's executive vice president of transaction services, according to a memo Noll sent to the company's customers on today and reviewed by The Wall Street Journal.