Recently, I’ve been studying economic indicators related to the U.S. stock market and found that many novice investors are still a bit confused about non-farm payroll data. Today, I want to clarify the concepts of the Small Non-Farm Payroll and the Large Non-Farm Payroll.

First, let’s talk about the Small Non-Farm Payroll. Its full name is the ADP National Employment Report, published by a payroll processing company called ADP. This company has access to a large amount of payroll data from businesses, so they release an employment report on the first Wednesday of each month. You can think of this as a private-sector employment snapshot, mainly reflecting how many new jobs private companies have added; government employment is not included.

Next is the Large Non-Farm Payroll, also called the U.S. Non-Farm Employment Report, abbreviated as NFP. This is the official data, released by the U.S. Bureau of Labor Statistics, usually on the first Friday of each month. The large non-farm data covers a broader scope, including employment changes in both the private and government sectors. Key indicators like new jobs added, unemployment rate, and average hourly wages are all included.

Why do investors care so much about these data? Because the large non-farm payroll is one of the most important economic indicators in the U.S., providing a comprehensive view of the health of the employment market. When the Federal Reserve sets monetary policy and adjusts interest rates, the NFP data is a crucial reference. The market’s reaction to the NFP is also particularly sensitive.

The reason the Small Non-Farm Payroll attracts attention is mainly because it is released two days earlier. Investors use the performance of the Small Non-Farm to adjust their expectations for the NFP. If the Small Non-Farm exceeds expectations or falls short, it can cause market volatility in the short term. However, honestly, the authority of the Small Non-Farm is not as strong as the official data, so its influence is actually limited.

In terms of data sources, the Small Non-Farm is based on payroll data from ADP’s clients, while the large non-farm is official government statistics with a broader coverage. The Small Non-Farm only looks at private companies, whereas the large non-farm includes government employment as well. That’s why the NFP is considered more authoritative by the market.

Regarding the short-term impact on the U.S. stock market, the NFP has a more direct effect. If the NFP exceeds expectations, it indicates a strong U.S. economy, which usually boosts stocks. Conversely, if the data falls short, investors may start worrying about a recession, and stocks could decline accordingly. The impact of the Small Non-Farm is relatively milder because investors see it as just a reference indicator, less credible than the official data.

In simple terms, the Small Non-Farm is more like a trailer, helping investors get a preview of market sentiment in advance. But the real market mover is the NFP released on Friday. If you want to buy the dip or short the U.S. stock market, be sure to mark the NFP release date on your calendar.