The auction raised more than USD 75,000 for several special operations charities, but the proceeds from the knife sale will specifically go to the family of Brett 'Shady' Shadle, according to Matthew Griffin, a former Army Ranger who helped organise the event.
Shadle, who served in SEAL Team Six with Owen, was killed in late March in a training accident in Arizona.
Owen's knife, a folding Emerson knife that Owen said was his secondary blade, was bought by an anonymous bidder.
It was one of the several items in the charity put on by The Macalan Group along with Combat Flip Flops and Intelligent Waves IW simultaneously online and at the Special Operations Forces Industry Conference and Exhibition (SOFIC) hosted this month in Tampa, Florida.
Griffin, the co-founder of Combat Flip Flops, told ABC News that when the bids for the knife jumped in the last minutes of the auction, which began on May 1, the audience at SOFIC was ecstatic.
"People were cheering, folks were in tears," he said.