Sources: Several senior executives from the crypto exchange Kraken have resigned

Kraken, the crypto exchange preparing for a US IPO early next year, has seen four senior executives leave its institutional business, according to people familiar with the matter. The recent departures include David Olsson, global head of institutional sales; Shannon Kurtas, head of exchange operations and vice president of product and professional services; Jeff Kramer, director of over-the-counter trading; and Sanjay K, head of over-the-counter trading for the Americas.