Web.com Inc. , a provider of internet services and online marketing for small and medium-size businesses, said Thursday it has agreed to be acquired by a unit of private-equity firm Siris Capital Group LLC in an all-cash deal valued at about $2 billion. Siris will pay Web.com shareholders $25 a share in cash, equal to a 30% premium over the stock’s 90-day volume-weighted average price ended on June 19, 2018. Web.com will hold a special shareholder meeting as soon as it can to vote on the deal. If the vote is successful, it expects it to close in the fourth quarter. In the meantime, the company has a ‘go-shop’ period until Aug. 5 to seek superior bid. “This transaction will provide shareholders with immediate and substantial cash value, while also providing us with a partner that shares in our commitment to customers and employees and can add strategic and operational value,” Chief Executive David Brown said in a statement. Shares rose about 8% premarket on the news, and are up 6.4% in 2018, while the S&P 500 has gained 3.5%.