Equifax CEO Richard Smith will testify about a massive data breach that impacted up to 143 Americans to the Senate Banking Committee on October 4.

The company’s shares have plummeted more than 30 percent amid letters from members of Congress about the hack and requests for answers. Smith had already agreed to testify before a U.S. House panel on October 3.

In an interview Tuesday on “Mad Money,” Senator Elizabeth Warren, a member of the banking committee, called for greater accountability for corporate leaders in the wake of the Equifax data breach and the Wells Fargo fake account scandal.

“So long as there is no personal responsibility when these big companies breach consumers’ trust, let their data get stolen, cheat their consumers, like they did in the case of Wells Fargo, then nothing is going to change,” Warren said.

Amid disclosures of data breaches at a broad array of companies and government agencies in recent years, the Equifax hack stands out.

Cybersecurity experts said it was among the largest hacks ever recorded and was particularly troubling due to the richness of the information exposed: names, birthdays, addresses and Social Security and drivers license numbers.