Cablevision Systems, the Long Island-based cable company and the owner of the AMC cable network, reported yesterday that first-quarter net income rose 40 percent, helped by the purchase of a smaller western cable company and improvement in most of its businesses. But results missed analyst expectations.

The Bethpage-based company’s net income was $104.1 million, or 36 cents per share, for the first three months of the year. That was up from $74.2 million, or 24 cents per share, a year earlier.

Analysts were expecting higher earnings, at 41 cents per share.

Revenue rose 10 percent to $1.92 billion. Analysts polled by FactSet were expecting $1.94 billion.

Cablevision shares fell $1.36, or 3.9 percent, to $33.91.

Growing profits from its cable business and a rebound in advertising were partly offset by higher losses from a segment that includes Newsday and Clearview Cinemas.

Cablevision raised its quarterly dividend to 15 cents per share from 12.5 cents per share.