WASHINGTON--Cyberattacks represent the "biggest systemic risk" facing the U.S., yet no one at the federal level is charged with ensuring the risk is being addressed in an optimal way, Securities and Exchange Commission Chairman Mary Jo White said Friday.

While regulators, law enforcement agencies and the private sector have scrambled to address cybersecurity, Ms. White said she is worried no one is "looking at the entire picture."

"Who's really got the ticket overall to make sure that it's all sort of coming together in an optimal way?" she said, speaking at a conference sponsored by the Investment Company Institute, a mutual-fund industry group.

The comments come as some SEC officials have pressured public companies to voluntarily disclose more about breaches at their firms and as the agency ramps up its scrutiny of Wall Street firms' responses to the risks. The SEC in 2011 issued guidance saying public companies should inform investors of "material" cyber risks and attacks, but it has left the definition of materiality vague.

A review of about 100 brokerages and investment advisers last year found that the vast majority reported cyberattacks directly or through one or more vendors, according to a report released by regulators earlier in February.

Concerns that hackers could wreak havoc on U.S. firms have prompted industry, particularly Wall Street banks, to work closely with the Federal Bureau of Investigation and other law enforcement agencies to boost cyberdefenses.

Yet industry officials have said adequately addressing the rang of cyberattacks remains daunting, a fact reinforced when J.P. Morgan Chase & Co. said that about 76 million households were affected by an attack on the bank last summer. J.P. Morgan's disclosure followed significant intrusions at Home Depot Inc., Adobe Systems Inc and Target Corp.

In addition, talking openly about cyberthreats is controversial in the business community because some executives fear it can make their companies a target for hackers, and public statements can expose firms to litigation.

Ms. White, in a tacit acknowledgment of those concerns, said companies can share information with federal law-enforcement officials outside the public-reporting process.

"Clearly there's a place for disclosure of cyber events that isn't part of the public-company disclosure regime but it's very, very important that information gets to the right source in the Department of Homeland Security, FBI, etc., and then that the private sector is being informed "look out for this', "look out for that'," she said.

Write to Andrew Ackerman at andrew.ackerman@wsj.com

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