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Date: Oct. 7, 2025
Contact: newsroom@ci.irs.gov
Philadelphia – United States Attorney David Metcalf announced that Antonios Mountis, and Alexandros Mountis, both of Lancaster, Pennsylvania, and Kostantinos Mountis of Lititz, Pa., were sentenced today by United States District Judge Joseph F. Leeson Jr. for tax offenses.
The defendants were charged by information in August of last year.
In October 2024, Antonios Mountis pleaded guilty to conspiracy to defraud the Internal Revenue Service (“IRS”) and failure to pay employment taxes. He was sentenced by Judge Leeson to five years’ probation and $634,802.39 in restitution.
Sons Alexandros and Kostantinos Mountis pleaded guilty in October 2024 to conspiracy to defraud the IRS and tax evasion. Alexandros Mountis was sentenced by Judge Leeson to 12 months and one day in prison, three years of supervised release, and $711,847.19 in restitution, and Kostantinos Mountis to six months in prison, three years of supervised release, and $689,580.51 in restitution.
As detailed in court filings, Antonios Mountis was the president and sole owner of Mountis Enterprises, Inc. (“MEI”), doing business as the Conestoga Bar and Grill, and Antonios Mountis & Sons, Inc. (“AMSI”), doing business as the Neptune Diner, with both restaurants located in Lancaster, Pa.
Alexandros Mountis was the manager of the Conestoga Bar and Grill, and Kostantinos Mountis was the manager of the Neptune Diner. Other family members were also employed at the restaurants.
As further detailed in filings and admitted to by the defendants, from about January 2014 through January 2021, Antonios, Alexandros, and Kostantinos Mountis conspired to pay employees of the family’s restaurants a portion of their wages off the books, failed to withhold trust fund taxes from these wages, failed to properly report the employees’ wages to the IRS, and failed to pay over to the IRS the correct employment taxes for these employees.
The case was investigated by IRS Criminal Investigation and prosecuted by Assistant United States Attorney Terri Marinari.
IRS-CI is the law enforcement arm of the IRS, responsible for conducting financial crime investigations, including tax fraud, narcotics trafficking, money laundering, public corruption, healthcare fraud, identity theft and more. It is the only federal law enforcement agency with investigative jurisdiction over violations of the Internal Revenue Code. IRS-CI has 16 field offices located across the U.S. and maintains an international presence through attaché posts abroad.