Slb N.V. SLB Moat

Key data

The moat

An oil company drilling a well thirty thousand feet under the sea floor does not shop on price. It hires the firm whose measurement tools, drilling fluids and reservoir models have worked in that basin before, because the cost of a failed well is orders of magnitude larger than the cost of the service.

SLB's position is the accumulated knowledge of the subsurface: decades of well data, the interpretation software the geologists use, and the technology to measure conditions while drilling. That is closer to a data moat than an equipment one, and it is why the technically hardest wells go to a short list.

What it should produce is margin that holds when activity does not, since the work that gets cancelled first is the commodity work rather than the difficult work.

Widening or narrowing

Revenue turned up and margin has not returned.

Revenue fell 1.6% for the 2025 full year against 2024. It has since grown 2.7% and then 5.0% year over year in the two most recent quarters, so the top line has turned.

Pretax margin peaked at 15.0% in the June 2025 quarter, fell 5.3 points over two quarters to 9.7%, and has recovered 1.7 points. The December 2025 quarter is the striking one: the highest revenue in the series produced the lowest margin, which is the opposite of operating leverage.

The overrated case, and the recent history is the evidence. A knowledge moat is supposed to hold price through a downturn, because the customer with a difficult well has nowhere else to go. What the margin series shows is a firm that gave up more than five points of margin as activity softened and has taken two quarters to recover a third of it. That is a cyclical service business with good technology. The technology is real and the pricing power it was supposed to confer is not visible in these numbers.

On profit pool, SLB takes a service fee from an operator whose economics are determined by a commodity price neither party controls. A modest slice, and it compresses first when the operator's own margin does.

The moat is narrowing.