The auction was held yesterday afternoon via Pilbara's Battery Material Exchange.
A cargo of 10,000 dry metric tonnes at a target grade of 5.5% lithia was presented for sale on the digital platform, with a deferred delivery date in February 2022.
The company reported strong bidding from a range of buyers, with 25 bids placed during the 45-minute auction window.
The bidder is now required to enter into a sales contract with Pilbara, which requires a 10% deposit to be paid in the coming days and an irrevocable letter of credit from a recognised bank to be presented during the first week of January.
The highest bid equates to a price of $2629/t for 6% spodumene.
Pilbara shares fell 2.7% this morning to A$2.20.