New York Attorney General Barbara Underwood has opened a probe into MoviePass parent company Helios and Matheson, the official confirmed Thursday in a tweet.

The attorney general's office is investigating whether the company misled the investment community regarding the company's financials, a person familiar with the matter told CNBC on Wednesday. The investigation is in the early stages.

@NewYorkStateAG: We've launchedWe've launched a securities fraud investigation into @MoviePass⁩' parent company. My office is committed to protecting New York investors and the integrity of our financial markets.

The attorney general is using the Martin Act, a statute designed to protect New York investors and the integrity of the financial markets from fraud.

"We are aware of the New York Attorney General's inquiry and are fully cooperating," Helios and Matheson said in a statement to CNBC. "We believe our public disclosures have been complete, timely and truthful and we have not misled investors. We look forward to the opportunity to demonstrate that to the New York Attorney General."

It's another stumble for MoviePass, which in recent months has repeatedly adjusted its movie subscription plans and taken out hefty loans to cover massive losses.

In August, Helios and Matheson reported a loss of $100 million in the second quarter, putting the company on pace to blow through its remaining assets in the span of months.

The company skyrocketed to popularity with an initial subscription that allowed moviegoers to see a film a day for $9.95 per month. But the popularity hurt profits, and MoviePass quickly adjusted the plan to limit the available movies, raise monthly prices and restrict the number of films users could see per month.

Meanwhile, Helios and Matheson's stock lost practically all of its value. Based on the company's most recently reported share count of 1.5 billion shares outstanding, the company trades at an implied valuation of $30 million.

Shares of Helios and Matheson fell 3 percent in extended trading Wednesday, though the stock trades for just 2 cents per share.