US CPI release: what it measures and how futures order flow reacts

What CPI measures

The headline figure is the CPI for All Urban Consumers (CPI-U). BLS collects prices for a fixed basket of goods and services, weights them by consumer spending, and publishes an index level plus percentage changes. Shelter is the largest single component, which is why rent and owners' equivalent rent often decide whether a month surprises.

Headline CPI includes food and energy. Core CPI removes both because they are volatile; it has its own page in this series. The monthly percentage changes are seasonally adjusted, while the 12-month change quoted in the press is computed on unadjusted data, so a large move a year earlier can change the annual rate even when the current month is unremarkable.

The numbers the market reads

What moves price is the gap between the print and the consensus forecast, not the level of inflation itself. A number that matches consensus can still move futures if the component mix differs from what forecasters assumed. BLS revises seasonally adjusted data for recent years once a year, with the January report, so an older monthly figure you remember may no longer be the official one.

Why futures react: the mechanism

• Rates: inflation feeds the expected path of the federal funds rate, which is priced into Treasury yields. Treasury futures prices move inversely to yields, so ZN and ZB reprice first and fastest.
• Stock indexes: a change in expected rates changes the discount rate applied to future earnings.
• Currencies: CME FX futures such as 6E and 6J are quoted in US dollars per unit of foreign currency, so a repricing of US rates relative to foreign rates shows up directly in their price.
• Gold: gold pays no yield and is priced in dollars, so changes in real yields and in the dollar both feed into GC.
• The sign of each reaction depends on the size of the surprise and on what was already priced; the same headline can produce opposite reactions in different months.

Reading the order flow around the print

In the minutes before 8:30 ET, many liquidity providers cancel or step back their resting orders. On a liquidity heatmap the bright bands near the inside fade, the DOM shows smaller numbers at each level, and the bid-ask spread can widen from its usual one tick. That thinning is a normal risk response, not a signal about direction.

At the release, the first trades typically sweep several price levels in one burst. On a footprint chart this appears as heavy volume on one side across consecutive prices with little opposing trade, and trade bubbles cluster at the extreme. The useful question in the following minutes is whether aggression keeps producing new prices (continuation, with delta confirming) or whether heavy volume keeps hitting a level that no longer gives way (absorption).

For index futures the release bar often becomes a reference for the rest of the session, and the 8:30 CT cash open adds a second auction an hour later. None of this predicts the next move; it describes who was aggressive and where liquidity held.

Tracking CPI in Senzoukria

In the News terminal, the economic calendar lists CPI under the US country filter; the default filters already show US and high-impact rows. Within twelve hours of the release the row carries a live countdown, and the top strip's “Next high impact” counter shows the time left to the next high-impact event. Clicking the row opens a detail panel that repeats the time in Chicago (“CME (Chicago)”) and in UTC, with the consensus forecast (F) and previous value (P). The released figure itself comes from BLS at 8:30 ET.

On the chart, the “Macro events” overlay draws a vertical line at the scheduled second of the release so the footprint of that bar sits next to the event label. The heatmap keeps its last five minutes at 100 ms resolution, so after the print you can pan back and look at how the book emptied before it. Replay loads any closed CME session tick by tick to study past CPI mornings, but it rebuilds trades only, not the order book.