What happened

Shares of solar microinverter maker Enphase Energy (NASDAQ:ENPH) collapsed a stunning 26% on Wednesday after short-seller Prescience Point Capital Management published a report accusing the company of fabricating revenue numbers and being, in essence, a sham of a growth story.

But on Thursday, Enphase's defenders on Wall Street are shouting back with a vengeance, and the stock, down so much on Wednesday, is turning around and rising 18.1% in response as of 10:45 a.m. EDT today.

Bull and bear face off standing on a stock chart

Image source: Getty Images.

So what

Wednesday's sell-off was quite simply overdone, investment bank J.P. Morgan said in a note covered today by TheFly.com. Sales channels are expanding and demand is rebounding in the U.S. since the market got rocked in March and April.

Moreover, with Enphase's stock having been driven down so much by Prescience Point's attack, two other investment banks reiterated their buy ratings on the shares, while a third upgraded its rating from accumulate to buy. Cowen says that with Enphase stock at $39 and change, it offers a "compelling" buying opportunity. Johnson Rice refutes Prescience Point's criticism of Enphase's sales growth by highlighting the very real cash that's flowing from those sales: $144 million in positive free cash flow generated over the past year, according to data from S&P Global Market Intelligence.

Roth Capital Partners calls the short-seller's accusations "specious," "illogical," "nonsensical," and "circumstantial." Echoing Johnson Rice, Roth argues "this amount of cash generation could [not] be accomplished [just] by overstating revenues and margins."

Now what

And for the most part, I agree. Revenue is easier to fudge than cash in the bank, and the fact that Enphase's bank account is growing -- from barely $100 million at the end of 2018 to nearly $550 million at the end of last quarter -- is clear evidence that the company's cash generation is real.

Now, I would point out that the $144 million in free cash flow Enphase generated over the past year is less than the $227 million in GAAP profit it reported for the period. If Prescience Point wants to make the argument that, at 40 times trailing free cash flow, Enphase stock is more expensive than the stock's 25.5 P/E ratio makes it appear, there's merit in that argument.

Luckily for buyers today, after Prescience Point's short attack, Enphase stock is at least a lot cheaper than it once was.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.