Horizon Oil (ASX:HZN) posted proved and probable (2P) reserves of 9 Million Barrels of Oil Equivalent (MMboe) as at June 30, down 9% from 9.9 MMboe, according to a Monday filing with the Australian bourse.

The company's total net production fell to 1.6 MMboe from 1.9 MMboe last year, the filing said.

Shares of the company rose 3% in recent Monday trade.