What kills Canadian oil and gas deals between LOI and signing?

Across thirty M&A transactions guided through IT diligence, we've watched deals collapse at three distinct stages - pre-LOI, between LOI and signing, and pre-close. Each stage kills deals for different reasons. The operators who understand the patterns prepare for each one differently - and avoid the failures that look obvious in hindsight.

Pre-LOI deal killers (rare, but expensive when they happen)

Most deals that fall apart pre-LOI fail because of misalignment on something fundamental that should have been clarified earlier. The patterns:

Valuation expectations 30%+ apart. Buyer thinks the asset is worth $80M based on reserves and production discount. Seller thinks it's worth $115M based on the same data plus optionality value. Neither moves. Deal dies before LOI.

Strategic incompatibility surfaced late. Buyer is positioning to monetize the asset within 18 months via a flip to a strategic. Seller wants the asset preserved as a going concern. Their motivations don't align on the long arc.

Major operational or environmental issue surfaced in initial conversations. Pipeline integrity issue, regulatory exposure, abandoned well liability. Deal dies before formal diligence.

Pre-LOI deaths are rare because most operators self-screen these issues before serious conversations begin. When they happen, the cost is mostly opportunity cost - time spent on conversations that don't conclude.

LOI-to-signing deal killers (the dangerous middle)

This is where most deal failures actually happen. Both sides have invested time, money, and reputation. The diligence team finds something material. The deal either dies or gets repriced significantly. Three common patterns:

Pattern one: Cyber findings the seller didn't disclose because they didn't know. Diligence finds white-label MSP cyber that the seller represented as named-product. Or finds that the "24/7 monitoring" is actually voicemail. Or finds the backup configuration isn't immutable. These typically trigger one of three responses: $500K-$5M cyber remediation escrow, deal repricing of 0.5-1.5 multiple turns, or - in worst cases - buyer walks because the cyber posture is incompatible with their own.

Pattern two: Production data variances that can't be explained. Buyer's diligence team pulls three years of well-by-well monthly production and reconciles to revenue. Material variances surface that the seller's team can't explain in real time. Even if the variances ultimately reconcile, the inability to explain them in week three of diligence signals operational immaturity and often triggers repricing.

Pattern three: Vendor contract surprises. The seller's MSP contract has a 24-month tail with change-of-control penalties. The seller's primary accounting platform contract requires written consent for assignment. The seller has an unsigned auto-renewal on a $200K/year vendor relationship. These weren't on anyone's checklist but they materially affect the post-close cost structure - and they're priced.

Pre-close deal killers (rare, but catastrophic)

After signing the SPA but before close, deals can still fail. Less common, but the consequences are severe because both parties have committed publicly. Two patterns dominate:

A cyber incident at the seller during the pre-close period. If the seller experiences a material cyber incident between signing and close, the buyer typically has a Material Adverse Change (MAC) clause that allows them to walk or aggressively renegotiate. The 2024-2025 ransomware surge in oil and gas made this a real risk that buyers now specifically diligence around. Sellers in pre-close should have heightened cyber monitoring, not relaxed posture.

Regulatory or legal surprise. Surface use agreement violation discovered. New regulatory action announced. Litigation served. Anything that materially changes the buyer's risk picture between signing and close.

How to prepare for each stage

The patterns above are predictable, and the preparation work is different for each stage:

For pre-LOI: Internal valuation discipline + honest strategic alignment + early surface of any material issues. The work happens before formal conversations begin.

For LOI-to-signing: This is where the 90-day readiness sprint pays off. Self-diligence surfaces the cyber gaps, production data variances, and vendor contract issues before the buyer's team finds them. Fixed gaps and explained variances eliminate the most common deal-killer categories.

For pre-close: Heightened operational discipline during the 60-120 day pre-close period. Cyber monitoring intensified. Regulatory compliance reviewed. Don't relax. The deal isn't done until close, and the buyer's risk picture is more sensitive in this window than at any other time.

The full framework - three deal stages, characteristic killers at each stage, preparation work specific to each - lives in Clean Data Room. Chapter 9 covers deal-stage risk specifically.

If you're 18 months from a potential transaction and want a structured diagnosis of where you stand, the IT-and-the-Cycle Assessment is the right entry point - three to five days, written report, no obligation.