Key highlights

  • Horizon Oil Ltd (ASX:HZN) closed at $0.20 on 20 October 2026, down 2.44%, against a 1.31% fall for the S&P/ASX 200 Energy index.
  • The shares are approximately flat over the past year.
  • Horizon announced on 9 September 2026 that the Nam Phong booster gas compressor was online, with field sales up about 84%.

Shares in Horizon Oil Ltd (ASX:HZN) closed at $0.20 on 20 October 2026, fell 2.44% on the day, a larger fall than the sector index. The S&P/ASX 200 Energy index (XEJ) closed 1.31% lower at 11,165.60, a fall of 148.40 points, while the broader S&P/ASX 200 (XJO) slipped 0.33% to 8,816.90.

Over the past 12 months the stock was approximately unchanged, at 0.00%.

A flat 12-month result means the stock closed at the same level as a year earlier, around $0.200. On the day, the closing price compares with a previous close of about $0.205, a move of -2.44%, set against a 1.31% fall for the sector index and a 0.33% fall for the broader market.

About Horizon Oil

Horizon Oil Limited is an Australian-listed oil and gas company with producing interests in Asia and the Pacific. Its Thailand business centres on the Nam Phong gas field in Block E5, in which MH Energy Thailand is the operator and holds 80%, and Horizon has an effective 60% interest.

Latest development

The share price data above is described separately from the project announcement. On 9 September 2026 Horizon announced that the Nam Phong Booster Gas Compressor had been commissioned and entered service on 4 September 2026. The project was designed to reduce system backpressure, improve well deliverability and increase gas recovery from the mature field.

Total field sales were approximately 10.3 TJ per day on a gross basis, an increase of 84% compared with average sales before the compressor started. Horizon said Thailand’s contribution to group production rises from about 2,000 barrels of oil equivalent per day to about 2,500 barrels per day.

The project was sanctioned in January 2026, following Horizon’s acquisition of the asset in August 2025, and was delivered safely, on time and below budget using a leased gas engine-driven compressor. Gas sales from Nam Phong are priced under a long-term, oil-linked contract, which Horizon said means the higher volumes are expected to translate quickly into more revenue and cash flow in a period of high oil prices.

Sector context

Small oil and gas companies often grow by acquiring mature fields and lifting output with low-cost projects, as Horizon has done in Thailand. Oil-linked gas contracts tie revenue to crude prices, which Horizon described as high recently.

Projects in Thailand require approvals from the national regulator and the state-owned partner in the concession, and Horizon thanked PTTEP and the Department of Mineral Fuels for their support through approval, construction and commissioning.

Risks

Horizon’s earnings depend on oil prices through its contract, and a fall in crude would lower realised gas prices. Nam Phong is a mature field, and the benefit of the compressor depends on how long increased rates can be sustained.

The company holds a minority-operated position, with the operator controlling the pace of work. The shares are low priced, and a 2.44% fall on 20 October 2026 was larger than that of the sector index.

Share price movements add a separate layer of uncertainty. The stock’s one-day move of -2.44% on 20 October 2026 compares with a 1.31% fall for the sector index, and its 12-month change of approximately 0.00% shows how far the share price can move over a year.

Catalysts to watch

Items to watch include sustained Nam Phong sales rates after the compressor start-up, Horizon’s next production report, and any further low-cost development opportunities in its portfolio.