Michael Bruno, founder of high-end online for art and antiques marketplace 1stdibs, and his partner Alexander Jakowec have listed their massive Southampton spread at 199 Coopers Neck Lane.

It’s asking $12.95 million.

They bought it for $15 million in 2015, and were rumored to be contemplating a sale in 2017.

Bruno tells The Post the couple is spending more time at their home in Maine.

Now officially on the market, the 14,000-square-foot brick home in the Hamptons features 11 bedrooms and sits on 3 acres near the ocean.

It was built in 1910 by lauded architect Grosvenor Atterbury.

The listing brokers are Corcoran’s Tim and Thomas Davis.