Recently, while analyzing the US stock market trends, I noticed that many people have some confusion about the understanding of employment data, especially the concepts of Small Non-Farm Payrolls and Large Non-Farm Payrolls. Actually, understanding the difference between these two is very helpful for interpreting short-term market fluctuations.

First, let's talk about Small Non-Farm Payrolls, officially known as the ADP National Employment Report. This data is released by ADP, a company specializing in payroll processing services. They estimate the number of new jobs added in the U.S. private sector based on their clients' payroll data. Small Non-Farm Payrolls are usually released on the first Wednesday of each month, two days earlier than the official Non-Farm Payrolls report. Because of its early release, investors often use it to predict how the larger report will turn out, so it does have some reference value.

What truly moves the market is the Large Non-Farm Payrolls, also known as the U.S. Non-Farm Employment Change (NFP). This is published by the U.S. Bureau of Labor Statistics and comes out on the first Friday of each month. The scope of the large report is much broader — it includes not only private sector employment but also government employment, essentially covering all non-agricultural employment changes in the U.S. The data includes new jobs added, unemployment rate, and average hourly wages, all of which are important references for the Federal Reserve’s monetary policy decisions.

The differences between the two are quite clear. Small Non-Farm Payrolls focus only on private companies and are based on data from a single company's sample, making its accuracy relatively limited and often deviating from the large report. The Large Non-Farm Payrolls is an official statistic with comprehensive coverage and authoritative credibility, so the market pays much more attention to it.

In terms of short-term stock market trends, Small Non-Farm Payrolls can cause some short-term volatility after release, as the market adjusts expectations for the upcoming large report based on this data. However, since Small Non-Farm Payrolls is not very authoritative, these fluctuations are usually limited. The real impact comes from the Large Non-Farm Payrolls. If the report exceeds expectations, it indicates the U.S. economy is still quite strong, often leading to a rally in stocks; conversely, if the data falls short, concerns about economic slowdown may cause short-term declines in the market.

Ultimately, Small Non-Farm Payrolls is just a reference, while the Large Non-Farm Payrolls is the key indicator. If you're engaged in short-term trading, especially involving U.S. stock-related assets, the market reaction at the moment of the large report release is often the most intense. That’s why many traders adjust their positions ahead of the Non-Farm Payrolls release.