PARIS—Altice NV, the telecoms group buying Cablevision Systems Corp. for $10 billion, said Tuesday it had met its 2015 targets, boosted by an improving sales trend at the company's French unit that swung to subscriber growth in the last three months of the year.

The company, founded by billionaire entrepreneur Patrick Drahi, posted earnings before interest, taxes, depreciation and amortization—or Ebitda—up 18% to €6.76 billion ($7.5 billion) in 2015, beating analysts' expectations.

Altice didn't publish a net profit figure.

Revenue at SFR, accounting for more than half of Altice's sales, fell 3.5% to €11.04 billion. Portugal Telecom revenue was down 7.3% in the year to €2.34 billion as Altice continued to restructure the business.

Revenue at Altice overall were flat year on year at €17.5 billion.

"We have strengthened our management team and during 2016 we will continue to be very focused on further improving operational and financial performance, integrating the businesses we have acquired and pursuing the efficiency target we have set out," said Chief Executive Dexter Goei.

Altice has used debt over the past two years to form a vast telecommunications empire ranging from France to Portugal and the U.S. In September it agreed to buy New York-based Cablevision Systems Corp. for $10 billion.

The company's share price has dropped 45% since its peak last year as investors questioned Altice's ability to grow its portfolio of businesses while keeping a tight lid on costs.

Write to Nick Kostov at Nick.Kostov@wsj.com

(END) Dow Jones Newswires

March 15, 2016 02:45 ET (06:45 GMT)

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