Jabil Tumbles 3.91% as $500M Volume Ranks 208th on NYSE Amid Sector Weakness

On September 24, 2025, Jabil Inc. (JBL) closed with a 3.91% decline, trading with a volume of $500 million ranked 208th on the NYSE. The stock's movement drew attention amid a broader market environment marked by sector-specific volatility.

Analysts noted that the decline aligned with a broader trend of manufacturing sector weakness, though no company-specific catalysts were explicitly cited in available reports. Institutional selling pressure appeared to dominate the session, with short-term traders capitalizing on technical indicators to exit positions. The stock's performance diverged from peers in the electronics manufacturing services space, which saw mixed results across the board.

Market participants observed that Jabil's recent earnings guidance had created a narrow path for upside momentum, with analysts emphasizing execution risks in its automotive and industrial segments. While the company maintains a diversified client base, ongoing macroeconomic uncertainties have limited investor willingness to extend valuations. The 52-week range remains a critical reference point for position sizing decisions.

To make sure I design the back-test exactly as you intend, could you please clarify a couple of points?

Market universe: • Do you want this applied to all U.S.–listed common stocks (NYSE + NASDAQ + AMEX), or a specific universe such as the S&P 500 constituents?

Position sizing: • Should each of the 500 selected stocks be held in equal weight (i.e., 0.2% of capital each), or do you prefer value-weighted (e.g., proportional to dollar volume)?

Transaction costs / slippage: • Should we assume zero frictions, or would you like to include estimated costs (e.g., 2 bps each side)?

Benchmark: • Any particular benchmark (e.g., SPY) you’d like the results compared against?

Once I have those details, I can generate the data-retrieval plan and run the back-test.