Why is Enphase Energy stock plunging today?

Enphase Energy stock plunged 14.3% in after-hours trading after the company released its third-quarter 2026 financial results following the close of regular trading, posting a double miss on earnings and revenue while issuing fourth-quarter guidance that fell far short of analyst expectations.

Adjusted earnings per share came in at $0.41, missing the $0.51 consensus estimate, while revenue of $293.3 million trailed the $303.85 million forecast and declined sharply from the same period a year earlier. The company’s Q4 2026 revenue guidance range of $225 million to $255 million — with a midpoint of $240 million — was substantially below the analyst consensus of approximately $300.5 million, implying a further 10% sequential decline in sell-through.

The demand picture underlying the results was equally troubling. U.S. sell-through fell 35% year-over-year, while European sell-through dropped 12% sequentially, with weakness concentrated in markets such as France. CEO Badri Kothandaraman pointed to "higher interest rates and the expiration of the Section 25D federal tax credit" as persistent headwinds for the core U.S. residential solar market. Adding to the pressure, GLJ Research maintained a Sell rating and lowered its price target on the stock around the time of the report, and Deutsche Bank had already downgraded shares earlier in October, warning that near-term growth expectations were too optimistic. Net insider selling of approximately $10.8 million over the past 12 months further underscored cautious sentiment from within the company.

The broader market offered no support. The S&P 500 was essentially flat on the day, the Nasdaq Composite slipped just 0.1%, and the Dow Jones was marginally positive — meaning the selloff in Enphase was entirely company-driven rather than a reflection of any macro shock. The stock’s after-hours slide pushed it toward its 52-week low of $25.78, a stark contrast to its 52-week high of $73.74, highlighting how severely the residential solar downturn has eroded the company’s valuation over the past year.

The combination of a Q3 earnings miss, a Q4 revenue guide roughly 20% below consensus, worsening demand trends in both the U.S. and Europe, and an unfavorable analyst backdrop proved too much for investors to absorb. While management highlighted longer-term growth opportunities — including its IQ Solid-State Transformer technology targeting AI data centers — the near-term fundamental deterioration dominated sentiment, sending shares to their lowest levels in over a year in after-hours trading.