Under Armour CEO Kevin Plank is considering selling his storied Baltimore County horse farm for $22 million, according to a now-deleted real estate listing.

The listing by the real estate firm Compass was publicly available online on Monday morning. Denie Dulin, the listing agent, said the Glyndon estate might be sold privately and declined to comment further.

“It’s not publicly being marketed yet,” Dulin said.

Plank bought Sagamore Farm from a developer in 2007 through an LLC. It’s unclear how much he paid. Property records do not disclose a sale price.

Sagamore has since become the name used by Plank for a variety of business ventures, including a whiskey distillery, a deluxe hotel in Fells Point, and the redevelopment of Port Covington into a new neighborhood known as Baltimore Peninsula.

Officials at Sagamore Farm, located northwest of Baltimore, did not immediately respond to a request for comment through its website or via email. The horse breeding and training facility has a century-long history, according to its website. It was founded by the wealthy businessman Isaac Emerson, who invented the Bromo-Seltzer headache remedy in Baltimore. He later passed down the farm to a relative who belonged to the Vanderbilt family.

The most famous horse to come out of Sagamore Farm was Native Dancer. Considered one of the greatest racehorses of all time, Native Dancer won both the Preakness Stakes and Belmont Stakes in 1953 after barely losing the Kentucky Derby in a photo finish.

Plank told The Baltimore Sun in 2010 that it was his goal for a horse from Sagamore Farms to one day win the Triple Crown.

“Our plan is to build something great over 20 to 30 years,” Plank said. “We don’t know what the future holds, but we’re going to go the big races and hope good things come from it.”

Sagamore Racing never fielded a Triple Crown winner, and in 2020 Sagamore Farm stopped training horses and exited thoroughbred racing.

The real estate listing for Sagamore Farm — which was taken down Monday morning after an inquiry from The Banner — included more than a dozen photos of the bucolic property. According to the listing, it covers more than 400 acres of “prime, picturesque” land. It has three “upscale” barns, a racing track, paddocks and a main house overlooking Worthington Valley.

According to state records, Sagamore Farm is owned by 3500 Belmont Road LLC, which lists its principal office as Plank Industries in the current headquarters of Under Armour in Locust Point.

Plank founded the athletic apparel brand Under Armour in 1996, turning it into a multibillion-dollar business. He led the company as CEO until stepping down in 2020, but he returned to the helm earlier this year.

Baltimore Banner reporter Justin Fenton contributed to this report.