The ADP Employment Change Report is a monthly economic indicator published by Automatic Data Processing, Inc. (ADP) in collaboration with the Stanford Digital Economy Lab. It measures the change in nonfarm private employment in the United States based on ADP's payroll data, which covers approximately 25 million employees. The report is released two days before the Bureau of Labor Statistics' (BLS) official jobs report, making it an early read on labor market trends. For September 2026, the prediction market question asks whether the ADP Employment Change will be above a specific threshold X, which is typically set by the market creator based on expectations or economic conditions at the time of market creation. The market resolves to Yes if the reported figure exceeds X, and it closes early if the event occurs before the scheduled resolution date. The ADP report is closely watched by economists, investors, and policymakers because it provides a high-frequency, real-time snapshot of hiring activity across industries and firm sizes. Unlike the BLS report, which includes government jobs and conducts a separate survey of households, the ADP report focuses exclusively on private sector payrolls processed by ADP, covering about one in six private sector employees in the U.S. Since its methodology was revised in 2017 to better align with BLS data, the ADP report has gained credibility as a leading indicator, though it can still diverge from the official numbers due to differences in sampling and timing. The September 2026 report will be released in early October 2026, covering hiring activity during the month of September. This period is significant because it captures the end of the summer hiring season and the start of the fall economic calendar, which includes back-to-school hiring and early holiday season preparation. The outcome of this prediction market depends on the threshold X, which could be set relative to recent averages, historical trends, or economic forecasts. For example, if X is set at 150,000, the market would resolve to Yes if ADP reports net hiring above that level. Understanding the context of the September 2026 labor market requires examining prevailing economic conditions, including interest rates set by the Federal Reserve, inflation trends, and sector-specific dynamics such as manufacturing, healthcare, and leisure and hospitality. The ADP report categorizes employment changes by industry (goods-producing vs. service-providing) and by establishment size (small, medium, large), offering granular insights beyond the headline number. For prediction market participants, the key is to assess whether the labor market in September 2026 is likely to be strong, weak, or in line with expectations, and how that compares to the threshold X. Factors such as Federal Reserve policy decisions, geopolitical events, and consumer demand will all play a role in shaping the September employment figure.

Historical Context

The ADP Employment Change Report was first published in 2006, with data going back to 2000. It was initially developed by ADP in partnership with Macroeconomic Advisers, a consulting firm. The early version of the report often diverged significantly from the BLS payroll numbers, leading to skepticism about its value as a predictor. In 2017, ADP overhauled its methodology in collaboration with the Stanford Digital Economy Lab, introducing a new model that better matched BLS definitions and seasonal adjustment techniques. Since then, the correlation between the ADP and BLS numbers has improved, though differences remain. For example, in the period from 2017 to 2019, the average absolute difference between the two reports was about 30,000 jobs per month, compared to about 50,000 before the revision. The report gained particular attention during the COVID-19 pandemic, when monthly employment swings were historically large. In April 2020, the ADP report recorded a loss of 20.2 million private sector jobs, the largest single-month decline on record. This was followed by a recovery that saw gains of over 1 million jobs in some months in 2021, reflecting the reopening of the economy. The September 2026 prediction market sits within a longer historical arc of post-pandemic labor market normalization. By 2023 and 2024, monthly ADP gains had settled into a range of 100,000 to 250,000, consistent with a mature economic expansion. The threshold X for September 2026 will likely be set relative to these recent averages. For context, the 10-year average monthly ADP change from 2014 to 2024 was approximately 165,000, excluding the pandemic period. The historical data shows clear seasonal patterns: September typically sees moderate hiring as summer jobs end and fall hiring begins, with an average gain of about 130,000 from 2014 to 2019. However, the pandemic disrupted these patterns, and seasonal adjustments have been recalibrated. The Federal Reserve's interest rate cycle also provides historical context. During periods of high rates, such as 2023-2024, job growth slowed as borrowing costs rose. If rates are still elevated in September 2026, the ADP number could be lower than in a low-rate environment. The historical relationship between ADP and BLS data is also important for prediction market participants. While the ADP report is not a perfect predictor, it tends to move in the same direction as the BLS report about 80% of the time. However, the magnitude can differ. For instance, in September 2023, ADP reported a gain of 89,000 jobs, while the BLS reported 336,000, a large divergence that was attributed to differences in how the two surveys captured part-time and gig workers.