"The scale of this hack is what will trouble the UK's 1.2 million users the most. With reports that Ashley Madison's customers have had everything from their credit card details to their real names and even their sexual fantasies compromised, there may be a lot of red faces in the UK this morning and much damage has likely already likely been done."
ALM revealed in April that it planned to float on the London Stock Exchange as it looked to raise money from investors hungry to cash in on the success of dating startups.
The company tried floating in Toronto five years ago, only to be greeted to a lack of appetite among cautious North American investors.
"Europeans have a more laissez-faire attitude toward infidelity," said Christoph Kraemer, head of international relations for Ashley Madison at the time. "Investors here will look past that and at the numbers."
Sign up for Computerworld eNewsletters.