Indexes · Energy
Oil Indices, Four Different Benchmarks
Four different things are called an oil index, and they do not move together. One of them can rise on the same news that sends another down, which makes naming the version more important here than anywhere else in this section.
Four measures, one name
"The oil index was up today" is a sentence with at least four meanings. It can describe an index of exploration and production companies, one of oilfield services businesses, one of refiners, or a product tracking the crude price through futures contracts.
Those are not variations on a theme. They respond to the same news differently, and in the case of refiners against producers the response can be opposite. Every other page in this section argues that the methodology is the formula; here the point is sharper, because the label does not even fix what is being measured.
Why an energy page belongs in this section at all
Every other index page here describes a rule for selecting companies. This one describes a family of measures that share a subject rather than a methodology, and it is included because that is the more common situation outside the headline indices, sector and thematic measures are usually defined by what they are about rather than by a published construction.
It is also the only place in this section where the underlying is not equity at all. A futures-based measure has no constituents, no float and no rebalance in the sense the rest of these pages use; what it has is a contract, an expiry and a curve. Putting it beside the equity versions is the quickest way to see that "index" is doing very different work in the two cases.
Why refiners are the interesting case
A producer’s revenue is the crude price, so the link is direct. A refiner buys crude and sells refined products, and earns the gap between them. That gap, the crack spread, is not the level of crude, and the two can move in opposite directions.
So a fall in crude that damages every producer can widen a refiner’s margin and help it. Anyone holding "energy" as one exposure has two businesses inside it with a relationship that varies from positively correlated to inverse depending on why the price moved. Grouping them under one sector label is standard practice and it hides that entirely.
Hedging, and why two producers respond differently
One more layer sits between the crude price and a producer's share price, and it is invisible from outside. Most producers hedge some portion of their output forward, selling future production at a fixed price to make their revenue predictable.
The consequence is that two companies pumping identical oil can respond quite differently to the same price move: the heavily hedged one is insulated on the way down and capped on the way up, while the unhedged one takes the move in full. Neither the hedge book nor its expiry schedule is visible in a price chart, and both change from quarter to quarter. It is a good reminder that an equity is a claim on a business rather than on a commodity, however tightly the two appear to move together.
The futures complication
The only version that tracks the commodity itself has a problem of its own. A futures position must be rolled from an expiring contract into a later one, and whether that costs or earns money depends on the shape of the forward curve.
Over long periods the roll can dominate the result. A product described as tracking crude oil can lose a substantial share of its value across a period when the spot price ended where it started, not through tracking error but because it was never tracking a price. It was tracking a strategy of holding and rolling futures, which is a different thing with a cost attached.
That is worth stating plainly on a site about volume and price, because it is the clearest case of a number behaving unlike the thing it is named after, the same class of error as reading a cumulative volume line’s level or treating an index’s divisor-scaled level as a price.
What it means for a sector breadth reading
| Observation | What it actually says |
|---|---|
| Nearly every energy issue advanced | The crude price rose. It is one event counted many times, not broad participation. |
| Producers up, refiners down | The more informative day: the spread moved against refiners, which a single sector figure averages away. |
| Services flat while producers move | Activity budgets have not responded yet. The delay is structural rather than a divergence. |
| Heavy sector volume, small price move | Worth a look, this is the effort-against-result reading, and it is not explained by the commodity alone. |
The instruction is the same one the Toronto page gives for a whole market: before reading a unanimous count as a market event, ask whether one price produced it. In the energy sector the answer is usually yes, and knowing that is what stops a correct number from supporting a wrong conclusion.
Frequently asked questions
What does "oil index" refer to?
At least four different things, which is the reason this page exists. It can mean an index of exploration and production companies, one of oilfield services companies, one of refiners, or a measure tracking the crude price itself through futures. They are quoted interchangeably in commentary and they do not move together. One of them can rise while another falls on the same news.
Why do refiners move differently from producers?
Because they earn a spread rather than a price. A refiner buys crude and sells products, so its margin depends on the gap between the two — the crack spread — and not on the level of crude. A falling crude price can widen that spread and help a refiner while it damages a producer whose revenue is the crude price. Grouping both under "energy" hides a relationship that is sometimes inverse.
And oilfield services?
They are paid for activity, not for oil. Their revenue follows drilling and completion budgets, which producers set with a lag after prices move and cut faster than they raise. So services companies respond later than producers and then more sharply in both directions, a geared, delayed version of the same cycle rather than a proxy for the price.
Can an index track the crude price directly?
Only through futures, and that introduces a complication worth understanding. A fund or index holding futures must roll from an expiring contract into a later one, and the cost or benefit of doing so depends on the shape of the curve. Over long periods that roll can dominate the return, so a "crude oil" product can lose value across a period when the spot price was flat. It is tracking a strategy, not a price.
Are energy equity indices a good proxy for the oil price?
Partially, and less than they appear. Producers are the closest, and even they carry everything else an equity carries, balance sheets, hedging programmes, management decisions, the broad market. A producer that hedged its output forward will not respond to a price move the way an unhedged one does. The correlation is real, varies with the cycle, and is never a substitute for the commodity.
How does this affect breadth readings in the energy sector?
It is the same concentration problem the Toronto page describes, in a narrower form. On a day when crude moves, a large share of an energy index moves together, and a sector-level advance/decline count will read as unanimous for one reason. The reading is accurate and says nothing about participation in the ordinary sense; it says the oil price moved.
What should I check before quoting an energy index level?
Which of the four it is, and how it is weighted. An index of a dozen very large producers behaves quite differently from an equal-weighted index of fifty smaller ones, and both differ from a futures-tracking product. As everywhere in this section, the methodology is the formula and the level means nothing without it.
Where does the data come from?
Exchange and index-provider documentation for the equity indices, and futures exchange data for the commodity contracts. This page names no specific index level or correlation figure on purpose: both move with the cycle, and a number printed on a static page would be cited long after it stopped describing anything.