Hedge-Fund Hack Part of Bigger Siege: Cyber-Experts

The attack on a U.S. hedge fund’s network, which a cybersecurity contractor said last week disrupted the firm’s high-speed trading and stole its data, is but one among many.

That is the assessment of more than a half-dozen computer security experts, who in recent interviews characterized the hedge-fund industry as the target of multiple attacks, many successful. Over the past two years, computer networks at dozens of banks, hedge funds, law firms and other Wall Street companies have been infiltrated by hackers mainly from Eastern European countries, these people said.