How 24/7 Markets Change Earnings-Season Trading

A company reports quarterly results at 4:05pm Eastern. In New York, the market closed five minutes ago. In London it’s past 9pm. In Singapore it’s just after 5am.

For most of the history of modern equity markets, that timing has been deliberate rather than accidental. It’s also meant that the reaction to earnings has followed a familiar shape: a report lands, the market is closed, and price discovery resumes at the next opening bell.

Continuous markets remove one of the conditions that produced that shape - and once that condition is gone, the familiar mechanics of an earnings reaction start to look different.

Why Companies Report Earnings After the Market Closes

Companies typically release results either before the market opens or after it closes. The reasoning is well established: a major disclosure arriving mid-session gives participants no time to read it. Price moves while the information is still being absorbed. Reporting outside the session provides a window in which the release can be read, analyzed and discussed before continuous trading resumes.

The window is not silent. After-hours and pre-market sessions exist in US equities, and prices do move in them. But those sessions have historically differed from the regular session in ways that matter: volume is lower, spreads are typically wider, and access has not been uniform across all types of participant. They serve as a partial rather than a complete substitute for regular-hours trading.

The result is a distinctive pattern. Information arrives at one moment; the market's full response is expressed at another. The interval between them concentrates a great deal of interpretation into a single reopening, which is where the familiar overnight gap comes from: the difference between where an instrument last traded and where it opens once the session resumes.

What Happens to the Overnight Gap in 24/7 Markets?

This is the change most directly tied to trading hours, and it is largely mechanical.

Where markets operate continuously, there is no single reopening moment for a reaction to be expressed in. A release that lands at 4:05pm Eastern can be traded at 4:06pm, at midnight, and at 7am, with prices adjusting continuously across those hours rather than arriving as a single repriced open.

The gap becomes a curve. Rather than one discontinuity between a close and an open, the reaction may distribute across a longer period, potentially forming in stages as the release is read, as management commentary is digested, and as participants in different regions come to the information at different local times.

That distribution is closely connected to who is awake and who has access. A results release at 4:05pm Eastern reaches a trader in Singapore at around 5am local time, and one in Europe late at night. For most of them, the options were a thin after-hours session, if they had access, or waiting for the next US open - over seventeen hours after the release - by which point the initial repricing had generally already happened. The information was public; the ability to act on it was not evenly distributed. Where markets run continuously, that wait is not structurally required.

Whether the resulting price path is smoother, noisier, or simply differently shaped is not settled. Continuous markets in this asset class are recent, and there is not yet a long enough history to draw firm conclusions. What can reasonably be said is that the mechanism by which a reaction is expressed is different, and that the difference is a function of when trading is possible rather than of how any individual participant behaves. That much is structural, not speculative: even before the data settles, the shape of the reaction has to change when there's no single reopening to express it in.

What Does Not Change

It would be easy to overstate the significance of the above. Several things are unaffected by trading hours, and they are worth setting out plainly.

The underlying market remains the reference. During US regular hours, the primary exchange is where the largest share of price formation in the underlying instrument occurs. Continuous trading elsewhere does not displace that; it operates around it. Prices formed while the primary market is closed are formed with less of the information that regular-hours trading provides.

Liquidity is not uniform across 24 hours. Trading being possible at 3am is not the same as trading being deep at 3am. Volume tends to concentrate around the hours when the largest pools of participants are active, and it thins outside them. Where liquidity is thinner, spreads are typically wider and larger orders have more effect on price. This is a persistent feature of continuous markets, not a transitional one.

Corporate actions still apply. Dividends, stock splits, mergers, halts and suspensions continue to operate on the underlying instrument according to the rules of the market on which it is listed. A continuously traded instrument referencing that stock remains subject to whatever the underlying does, including events that suspend trading in it entirely.

Information asymmetry persists. Extending the hours in which trading is possible does not change who reads a filing first, who has access to management commentary, or who has the tools to interpret a set of results quickly. Those differences exist during regular hours and they exist outside them. If anything, they may be more visible in periods when fewer participants are active.

The information itself is unchanged. A quarterly report contains what it contains regardless of when it can be traded on. Trading hours affect the timing and distribution of a market's response, not the substance of what is being responded to.

Conventions Are Still Forming

Extended and continuous trading is a recent development, and the market conventions around it are not yet settled. Traditional exchanges have their own approved extensions to trading hours moving through implementation, which suggests the boundary between "session" and "outside session" is likely to keep shifting for some time.

Several questions remain genuinely open. Whether reporting conventions themselves change if the concept of "after the close" becomes less meaningful. Whether the official closing price retains its current central role in valuation and index calculation. Whether liquidity outside traditional hours deepens as participation grows, or remains structurally thinner. None of these has an evidenced answer yet.

What can be observed is narrower: a convention built around a daily pause behaves differently when the pause is absent. For someone reading a set of results at 5am local time, whether the reaction has already largely happened is a different question than it was a few years ago.

For readers interested in the mechanics of how equity perpetuals are priced when the underlying market is closed on Arcus, we've covered that here.

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