Shares of Uber fell 2.3% in premarket trading, after a Guardian report on Sunday said the ride-hailing giant had breached the law and taxi regulations and secretly lobbied governments in its global expansion.
It cited documents spanning 2013 to 2017 that include emails between top executives.
Uber shares have more than halved in value over the past year.
Uber responded to the media by saying it "will not make excuses for past behaviour that is clearly not in line with our present values".
The company said there had been "no shortage of reporting on Uber's mistakes prior tto 2017".
"Instead, we ask the public to judge us by what we've done over the last five years and what we will do in the years to come," Uber's senior vice president of marketing and public affairs Jill Hazelbaker wrote.
Ms Hazelbaker said the company's "mistakes culminated in one of the most infamous reckonings in the history of corporate America".
"That reckoning led to an enormous amount of public scrutiny, a number of high-profile lawsuits, multiple government investigations, and the termination of several senior executives," she said.
Ms Hazelbaker said that is why Uber hired Dara Khosrowshahi as its new CEO under the guidance of former US Attorney General Eric Holder "to investigate and overhaul our business practices".
"Dara rewrote the company's values, revamped the leadership team, made safety a top company priority, implemented best-in-class corporate governance, hired an independent board chair, and installed the rigorous controls and compliance necessary to operate as a public company," she said.
"When we say Uber is a different company today, we mean it literally: 90 percent of current Uber employees joined after Dara became CEO," she added.
"We've moved from an era of confrontation to one of collaboration, demonstrating a willingness to come to the table and find common ground with former opponents, including labor unions and taxi companies," Ms Hazelbaker said.
"We are now regulated in more than 10,000 cities around the world, working at all levels of government to improve the lives of those using our platform and the cities we serve," she added.
Ms Hazelbaker said Uber has "invested heavily" in safety and committed to become "a zero-emission mobility platform by 2040".
"We're investing $800 million to help drivers switch to electric vehicles and reporting on our progress along the way. We maintain gender and racial pay equity and have tied our senior executives' compensation to our diversity goals," she added.
