Earnings Season

What Is Earnings Season?

Four times a year, the stock market absorbs a flood of new information in a few weeks. Public companies report revenue, profit and their outlook every quarter, and most of them run on the calendar year, so their quarters end on the same dates: 31 March, 30 June, 30 September and 31 December. Results for the quarter ending in March arrive mostly from mid-April to mid-May, and the pattern repeats in July, October and January.

Deadlines tighten the cluster. In the US, larger companies must file their quarterly report, Form 10-Q, within 40 days of quarter-end, and smaller ones within 45 days. Most publish a press release and hold an earnings call before that deadline, so the busiest stretch of each season falls three to six weeks after the quarter closes.

Not every company fits the calendar. Walmart and Nvidia close each fiscal quarter around the end of January, April, July and October, so their results land between the main seasons. A season therefore has no official start or end date: it is a market convention, not a rule.

How Does Earnings Season Work?

Once you know why reports cluster, the next step is to see how a season unfolds week by week. Large US banks usually open it about two weeks after quarter-end, because they can close their loan, deposit and trading books quickly. For decades, aluminium maker Alcoa served as the unofficial starting gun; after the company split in 2016, the banks took over that role.

Peak weeks come next. In the middle of a season, more than 100 members of the S&P 500 can report in a single week, with technology, healthcare and consumer giants landing close together. Retailers, which run on fiscal years that end in January, close the season out.

Every report is judged against the consensus estimate, the average forecast of the analysts who cover the stock. Results above it count as a beat, results below it as a miss. The company’s outlook for the next quarter, its earnings guidance, often moves the stock more than the quarter just finished.

How to Calculate Earnings Growth During Earnings Season

Data providers summarise a season with a blended growth rate. It combines the actual results of companies that have reported with the consensus estimates for those that have not, so one number describes the whole index while the season is still under way.

Take an index whose members earned $500 billion in the same quarter a year earlier. In week two, companies that earned $150 billion a year ago report $168 billion, a 12% rise. The rest earned $350 billion a year ago and are expected to earn $357 billion, a 2% rise. Blended growth is ($168 billion + $357 billion) ÷ $500 billion − 1, or 5%.

Now suppose the remaining companies also beat their estimates by 5%. Their earnings come in at about $375 billion instead of $357 billion, and blended growth for the index rises to roughly 8.6%. Nothing in the economy changed between week two and week six, yet the headline figure climbed by more than three percentage points, because analysts set the bar low and companies cleared it.

This drift is built into the process. Analysts tend to trim their forecasts in the weeks before a season, and companies guide conservatively, so the share of companies that beat is usually well above half. A season full of beats can still disappoint, because traders have learned to expect them.

Earnings Season vs. a Single Earnings Report

Why Is Earnings Season Important for Traders?

Earnings season is when stock prices reset to hard numbers. Between reports, prices move on forecasts; during the season, they move on reported results and on what management says next. Single stocks can gap 5% to 10% or more overnight, because most results come out after the close or before the open, when trading is thin.

Reports also spill over to companies that have not reported yet. When a chipmaker cuts its outlook because a large customer ordered less, rivals and suppliers often fall the same day, a pattern traders call read-across. Index moves can hide this: if a few large stocks rise 10% and others fall 10%, the index may barely move while the stocks inside it swing widely.

The season carries its own risks. Options get more expensive before a report and lose value after it, an effect known as IV crush, so buying options just before results can lose money even when you guess the direction right. Gaps also jump over stop-loss levels: a stop at $47 on a stock that closes at $50 and opens at $44 fills near $44, not $47.

Corporate buying slows down too. Many companies pause share buybacks in the weeks before they report, a self-imposed blackout tied to insider-trading rules, and resume once results are public. That removes a steady buyer from the market during part of each season.

Key Takeaways

• Earnings season is the few weeks after each quarter-end when most public companies report, because they share calendar quarters and filing deadlines.
• In the US, large banks usually open the season about two weeks after quarter-end, and the busiest weeks fall three to six weeks after it.
• Blended growth mixes reported results with estimates for companies yet to report, so the headline figure tends to rise as companies beat lowered forecasts.
• A high beat rate does not guarantee rising prices, because guidance and expectations already priced in matter more than the quarter just finished.
• The season brings overnight gaps, read-across between peers and falling option premiums after reports, so position size and stop placement need extra care.