WTI $140 odds collapse 38pp in 7 days — crude-dependent refiners haven't repriced margin windfall

Angle B — the market has moved from a genuine tail extreme (50%) to a still-meaningful but rapidly deflating probability (12%), and a specific equity is priced as if the crude spike risk remains elevated. This is a tail-mispricing fade: the crowd at 50% one week ago was pricing a near-coin-flip on WTI hitting $140 in May, which would have been catastrophic for refining margins (crude input costs would have crushed crack spreads). Now at 12%, the crowd is saying that extreme is off the table — but refiner equity valuations have not fully repriced the removal of that tail risk. WTI at $101.94 is already elevated, but the $140 scenario would have compressed MPC's crack spread from ~$28/bbl toward single digits as crude input costs surged faster than product prices. With that scenario now 12% likely (and falling), MPC's forward margin profile is materially better than it was seven days ago when the market was pricing a coin-flip on $140 crude. The equity market has not moved MPC by more than its sector peers this week despite XLE leading +3.7% — meaning the specific margin-protection benefit of the $140 tail collapsing has not been priced in. The transmission is direct: lower crude ceiling → wider sustainable crack spread → higher refining EBITDA → MPC re-rates. When this information asymmetry closes (either $140 becomes impossible as May ends, or crude rolls over), MPC captures the margin expansion that the $140 fear was suppressing in forward estimates.

The strongest case against this trade is that WTI at $101.94 is itself already elevated and rising (+8% in one week), meaning crack spreads may already be compressing even without hitting $140 — MPC's margins are being squeezed in real time regardless of what the $140 tail probability does. The most vulnerable assumption in the chain is that the $140 probability collapse reflects genuine supply-side relief rather than simply time decay as May nears its end (a $140 print in the last few days of May was always unlikely). If crude continues rising toward $110-115, MPC's input cost pressures will overwhelm any tail-risk removal benefit. The single data point that would flip this view: a WTI print above $108 in the next 48 hours, which would suggest the $140 tail is collapsing on time-decay alone, not on genuine supply normalization, and MPC margins would be deteriorating in real time.