A rogue employee was responsible for hiding $151 million in delivery expenses over the course of nearly three years, Macy’s said Wednesday.

In a statement accompanying its quarterly earnings results, the department store chain said a single employee responsible for small package delivery expense accounting had intentionally created erroneous cost entries from the fourth quarter of 2021 through the third quarter of 2024. The employee also falsified underlying documents, according to a Macy’s regulatory filing Wednesday morning.

Macy’s Chairman and CEO Tony Spring said on the company’s earnings call that its investigation found the employee “acted alone and did not pursue these acts for personal gain.”

The employee told investigators that a mistake was initially made in accounting for small parcel delivery expenses, and then the person made intentional errors to hide the mistake, according to sources familiar with the investigation.

In an announcement last month that first revealed the situation, Macy’s estimated the erroneous entries totaled between $132 million and $154 million. The revelation led Macy’s to delay reporting its quarterly results for two weeks and caused its shares to tumble.

“We’ve concluded our investigation and are strengthening our existing controls and implementing additional changes designed to prevent this from happening again and demonstrate our strong commitment to corporate governance,” Spring said in a statement. “Our focus is on ensuring that ethical conduct and integrity are upheld across the entire organization.”

Macy’s did not disclose any additional information about how the employee’s actions were discovered and reiterated that the person is ‘no longer with the company.’

Macy’s said the investigation found that its internal accounting controls were vulnerable to employees sidestepping them. The company said it is revising those processes.

After consulting with its longtime independent accounting firm, KPMG, Macy’s also said that a report released in February on its internal controls ‘should no longer be relied upon’ — nor should KPMG’s previous endorsement of Macy’s internal controls.

In premarket trading Wednesday, Macy’s shares were down as much as 11% as it also reported earnings that missed analysts’ estimates.

Although $151 million is small relative to the $4.36 billion Macy’s said it had tallied in overall delivery expenses during the period in question, it is more than the entire company’s most recent fiscal year net profit of $105 million.

The discovery also comes as Macy’s attempts a turnaround amid broad shifts in consumer habits, with the chain having announced in February a plan to close 150 stores over several years. Earlier this week, an outside investor group said it had taken a significant stake in Macy’s seeking to shake up the retailer’s operations, including monetizing its real estate holdings.