Plug Power Shares Plunge 5.56% as Dollar Volume Dives 29.55% to 207th Ranking

Plug Power (PLUG) closed 5.56% lower on Oct. 8, 2025, with a trading volume of $540 million, marking a 29.55% decline from the prior day’s activity. The stock ranked 207th in dollar volume among listed equities, reflecting subdued investor interest amid mixed market conditions.

The back-test parameters for the strategy require clarification on key execution details. The universe definition must specify the market scope for the “top 500 stocks”—whether U.S.-listed common stocks exclusively or broader indices like MSCI World. Additionally, the frequency of portfolio reconstitution (e.g., daily rebalancing based on dollar volume) remains unclear.

Portfolio construction details are critical for accurate simulation. Confirming whether the 500 stocks will be equally weighted and whether transaction costs or slippage should be factored in is essential. If included, assumptions such as 5 basis points per trade need to be defined to ensure replicable results.

Technical constraints further complicate the process. The current single-ticker back-testing engine cannot handle simultaneous execution across hundreds of tickers. Options include scripting an external calculation for full portfolio performance or approximating the strategy using an index/ETF proxy, though the latter may compromise precision. Finalizing these parameters will determine the feasibility and accuracy of the back-test outcome.