Fredrick DiSanto’s Ancora Advisors has called on U.S. software maker Everbridge to look for a buyer, around 10 months after Activist Insight Vulnerability argued an activist may step in and push for a sale.

Ancora, a 4% shareholder, said in a Thursday letter Everbridge is “dramatically undervalued” and a sale could end in shareholders pocketing more than $70 per share, nearly double Wednesday’s close.

Shares in Everbridge climbed 13% to $41.35 each Thursday. Even with this, the stock is down 71% from a year ago. The market value stands at around $1.6 billion.

Everbridge provides mass notifications for public organizations and companies. It makes money by selling annual subscriptions to its services, providing recurring and stable revenues, something that typically attracts activists, argued Activist Insight Vulnerability reporters last May when making the case for a potential attack.

Subscribers to Activist Insight Vulnerability can read the report here.

In its Wednesday letter, Ancora said that while Everbridge has a strong position in “a large and still-growing market,” the company’s leadership has been unable to “execute on the company’s opportunities for growth and deliver value for shareholders.”

The activist argued Everbridge has underperformed peers due to “haphazard execution and deteriorating capital allocation,” adding that the company also has a misaligned board that is “blind to blatant” conflicts of interest and endorses “extremely problematic executive compensation practices.”

Commenting on Ancora’s letter, Everbridge said on Thursday that it was considering steps to improve execution and focus, including by pausing material new M&A and simplifying product offerings. However, the company pledged to analyze Ancora’s recommendations as part of its regular review of management’s strategy “against a range of alternatives.”

Three months ago, Everbridge’s stock nearly halved in just one day after its CEO abruptly left. Ancora believes the company’s problems cannot be fixed by hiring a new chief executive and believes a private equity suitor would be better equipped for turning around the business.

A buyout shop could bid $70 per share for Everbridge while a strategic acquirer “that has the potential to enjoy both revenue and cost synergies could justify an even higher price,” wrote Ancora CEO DiSanto and Ancora President Jim Chadwick.