Yahoo's former chief operating officer Henrique de Castro was not the right fit for the company, CEO Marissa Mayer said on Wednesday.
De Castro was fired earlier this year, garnering $58 million in severance for 15 months of work.
Mayer, speaking live at the TechCrunch Disrupt conference in New York, dodged the question of whether de Castro's hiring was her biggest regret as CEO.
"I think it was the right time for us to go our separate ways," Mayer said. "There were issues there that I potentially created, and it was important to me to fix them."
Yahoo shares were down more than 6 percent in afternoon trading. On Tuesday China's Alibaba, in which Yahoo owns a huge stake, filed for an initial public offering.
There have been questions about how much of Yahoo's worth is actually tied up in Alibaba, and what will happen to Yahoo when it sells Alibaba shares. (What's the stock doing now? Click here)
Read MoreChina's Alibaba seeks blockbuster IPO in US
Oracle's set to report earnings Wednesday. Rick Sherlund, managing director at Nomura Securities previews, the numbers.
The Sony Pictures Entertainment comedy at the center of a devastating cyber attack is facing another obstacle — rival studios. Re/code reports.
A U.S. bureau filed a lawsuit against wireless carrier Sprint over unauthorized charges on customers' cellphone bill.
Two Costolo Living family trusts no longer own any Twitter stock after they sold their remaining shares this month.
Get the best of CNBC in your inbox
The move to normalize relations with Cuba will strengthen the Castro "dictatorship," a former U.S. diplomat says.
The Florida Republican senator also says Congress won't support lifting the half-century embargo on Castro's Cuba.
Here's why the new BlackBerry, the Classic, "will further change how people think about BlackBerry," says CEO John Chen.