25 Stocks to Avoid in September, Historically

Enphase Energy (ENPH) has historically been a significant underperformer in September, recording losses in eight of the last ten years with an average 5% monthly decline. The stock is already down 45.4% year-to-date, struggling to rebound from a recent five-year low of $29.89 amidst broader solar sector headwinds and a lack of meaningful tailwinds from its EV charging component. Furthermore, a high 10-day call/put volume ratio of 2.65, exceeding 90% of readings from the past year, suggests potential unwinding of optimism among options traders, indicating continued downward pressure.

Analysis

Enphase Energy (ENPH) exhibits a combination of significant historical, technical, and sentiment-based headwinds. The stock has a pronounced negative seasonality in September, having declined in eight of the last ten years with an average loss of 5%. This historical weakness is compounded by its recent performance, with the equity down 45.4% year-to-date and struggling to recover from a five-year low of $29.89 set in August. Technically, any upward momentum is being constrained by firm resistance at the 60-day moving average. Fundamentally, the company faces dual pressures: broader solar sector challenges stemming from negative political commentary and a failure of its EV charging business to generate meaningful growth tailwinds. Furthermore, investor positioning in the options market presents a near-term risk; the 10-day call/put volume ratio of 2.65 ranks in the 90th percentile for the past year, indicating a high level of speculative bullishness that, if it unwinds, could trigger further downward pressure on the stock.

Key Decisions for Investors

• Given the stock's significant historical underperformance in September and its 45.4% year-to-date decline, investors holding long positions should consider hedging or reducing exposure to mitigate potential downside risk.
• The confluence of technical resistance at the 60-day moving average, sector-wide headwinds, and weak fundamental catalysts presents a compelling case for bearish-biased investors or those looking to initiate short positions.
• Traders should closely monitor the elevated 10-day call/put ratio of 2.65, as a reversal or unwinding of this optimistic options positioning could serve as a key catalyst for accelerated selling pressure.