Harbour Energy to Acquire LLOG in $3.2 Billion Deal, Entering US Gulf of America

Harbour Energy acquires LLOG for $3.2bn, marking its strategic entry into the deepwater US Gulf of Mexico. The deal adds long-life, oil-weighted reserves and targets free cash flow per share accretion from 2027.

22 December 2025by Joshua Thompson6 min read23 views

This article covers information on Harbour Energy PLC.

LON:HBR

Harbour Energy buys LLOG for $3.2 billion – a bold leap into the deepwater US Gulf of America

Harbour Energy has agreed to acquire LLOG Exploration for $3.2 billion, marking its long-planned entry into the deepwater US Gulf of America. The price combines $2.7 billion in cash with $0.5 billion in new Harbour shares. On completion, LLOG’s owner will hold 11% of Harbour’s voting shares, with 70% of those shares locked up for a year.

This is a strategic pivot. Harbour is adding a high-quality, oil-weighted offshore portfolio with low operating costs, long-life reserves and strong operational control. Management says it should lift production, extend reserve life, improve margins and, crucially, become free cash flow per share accretive from 2027.

What Harbour is actually buying: deepwater oil with long runway

LLOG is a respected private operator in the Gulf of America with nine producing assets, roughly 80% oil weighting and 2P reserves of 271 mmboe (proved plus probable). Management pegs H1 2025 working interest production at 34 kboepd with operating costs of $12/boe and a blended US tax rate of about 23%.

These are long-life barrels. The portfolio has an estimated 2P reserve life of 22 years, and production is expected to approximately double by 2028, driven by a leading position in the Lower Tertiary Wilcox play (a prolific deepwater oil-bearing formation).

Key deepwater hubs: Who Dat, Buckskin and Leon-Castile

Who Dat (Mississippi Canyon) – H1 2025: 14 kboepd, ongoing infill drilling, with Who Dat East targeting FID in 2026 and further upside in deeper reservoirs.
Buckskin (Keathley Canyon) – H1 2025: 10 kboepd, Wilcox reservoir quality and completions expertise noted, with new wells planned to more than double future output.
Leon-Castile (Keathley Canyon) – first production in October 2025, currently 14 kboepd; co-developed via the Salamanca FPS (floating production system) with a long infill inventory and potential extension into the Leon East Fault Block.

LLOG operates more than 80 leases, predominantly in Mississippi Canyon and Keathley Canyon, and expects to secure 11 more deepwater leases from the recent federal sale. There is a pipeline of short-cycle, infrastructure-led drilling, including the potential for 8 wells across 2026 and 2027.

Why this matters for Harbour’s strategy and returns

This deal plants Harbour firmly in one of the world’s most prolific offshore basins, with strong infrastructure, a supportive fiscal environment and supply chain benefits that could also help Harbour’s Mexican projects. It adds scale in OECD oil, increases operational control and, per management, reduces the Group’s effective tax rate.

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On portfolio metrics, it adds 271 mmboe of 2P reserves, lifting Harbour’s year-end 2024 2P reserves by 22% and extending reserves life from 7 to 8 years. It increases H1 2025 production by 7% and supports overall Group production at around 500 kboepd to the end of the decade.

Cash flow and shareholder distributions

Harbour guides to free cash flow per share accretion from 2027. On policy, it plans to move to a payout ratio approach in 2026, combining a base dividend with share buybacks, more in line with international and US oil and gas peers. Management also reiterates the aim to strengthen an investment grade credit profile, supported by enhanced scale, reserve life and cash generation.

Deal terms and funding: the nuts and bolts

The $3.2 billion consideration comprises $2.7 billion in cash and $0.5 billion in new Harbour voting ordinary shares. Harbour will issue 174,855,744 new shares to LLOG’s owner at an agreed value of 215 pence per share. Post-completion, existing shareholders will be diluted, with LLOG Holdings LLC owning 11% (subject to adjustment for the ongoing buyback programme). A 70% lock-up applies for one year after completion.

Funding comes via an underwritten $1 billion bridge facility, a $1 billion term loan and existing liquidity. Harbour has placed a $100 million deposit into escrow that could be retained by LLOG’s owner if Harbour fails to complete when conditions are met.

Timing and approvals

Completion is subject to customary conditions, including expiration or termination of HSR Act waiting periods in the US (antitrust review). Target timing is late Q1 2026, with a long stop date of 1 July 2026. The transaction is a Significant Transaction under the UK Listing Rules but does not require shareholder approval.

What the numbers say about LLOG

LLOG’s gross assets were $2,119 million as at 30 September 2025. Net income was $244 million in 2024 and $136 million for the nine months to 30 September 2025. The portfolio is oil-weighted with low operating costs and meaningful near-term growth activity. Harbour plans to keep the LLOG name for its new Gulf of America business unit and leverage the team’s deepwater expertise across the Group.

The good, the bad and what to watch

Positives

Oil-weighted, low-cost barrels in a supportive jurisdiction with strong infrastructure.
Meaningful reserve and production uplift, extending Harbour’s reserve life and enhancing margins.
Free cash flow per share accretive from 2027, with a clearer path to competitive shareholder distributions.
Operational control over high-impact assets and a deep inventory of short-cycle wells.

Risks and trade-offs

Dilution: 174,855,744 new shares issued, with LLOG’s owner at 11% on completion.
Higher leverage: $2.7 billion cash consideration funded with new debt facilities and liquidity, increasing debt service until cash flows build.
Fixed consideration risk: value at completion could diverge from assumptions, and the number of consideration shares will not adjust for market moves.
Execution: integration, maintaining safe operations and delivering the planned drilling programme.
Macro and geology: commodity price volatility, reserves uncertainty and evolving US regulatory and climate policies.

Timeline and catalysts

HSR clearance and closing – expected late Q1 2026, long stop 1 July 2026.
Capital programme – potential 8 wells across 2026-2027; Who Dat East FID targeted in 2026.
Production trajectory – portfolio production expected to approximately double by 2028.
Policy shift – adoption of payout ratio approach in 2026, including base dividend and buybacks.

Key deal terms at a glance

Purchase price	$3.2 billion
Cash component	$2.7 billion
Share component	$0.5 billion
New shares issued	174,855,744 at 215 pence per share
Post-deal ownership	LLOG Holdings LLC 11%, Harbour shareholders 89% (subject to buybacks)
Lock-up	70% of consideration shares for one year
LLOG production	34 kboepd (H1 2025, WI)
Operating costs	$12/boe (H1 2025)
2P reserves	271 mmboe (YE 2024, WI)
2P reserve life	22 years
Blended tax rate	c.23%
Completion target	Late Q1 2026

My take

This is a strategically coherent deal that tilts Harbour further towards oil, deepwater and OECD barrels with attractive unit costs. The LLOG team and track record are real assets in their own right, and the production and reserves uplift looks material while keeping Harbour on a path to around 500 kboepd through the decade.

There is, however, a clear near-term cost of capital: dilution on day one and higher leverage until the assets deliver. The promise of free cash flow per share accretion from 2027 and a more competitive payout framework in 2026 are the prizes. Delivery will depend on safe integration, timely HSR clearance and a tight execution of the 2026-2027 drilling plan. On balance, it is a bold step that fits the strategy and, if executed well, should strengthen Harbour’s long-term cash generation and investment grade ambitions.

Jargon buster

2P reserves: proved plus probable reserves, an industry standard measure of recoverable volumes.
kboepd / boe: thousand barrels of oil equivalent per day / barrel of oil equivalent.
Operating costs per boe: cash production costs divided by volumes produced.
Wilcox play: a deepwater geological formation in the Gulf of America known for oil discoveries.
FPS: floating production system, an offshore facility used to process and export hydrocarbons.
HSR Act: US Hart-Scott-Rodino antitrust review process required before closing certain transactions.