A failing NBC has left Univision the fourth most popular network in the United States — at least for now.

The latest ratings from the February “sweeps” race — a milestone moment for network ratings in the television business — had NBC fall behind its Spanish-language rival. The Doral-based network finished the sweeps period with a viewership that amounted to 1.5 percent of all adults between 18 and 49. That’s considered the key demographic for television advertisers, and it’s the most common yardstick for measuring a network’s success.

The 1.5 percent share was ahead of NBC’s 1.2 percent share. CBS dominated the contest with a 4.9 percent share, followed by Fox (2.0 percent) and ABC (1.7 percent), according to EW.com.

Univision has beaten CBS before in the ratings race, but this is the first time the Spanish-language powerhouse has bested NBC. The victory is a bit sweeter since NBC owns Univision’s cross-town rival, Telemundo. As NBC slid, Univision saw audience for its news programs and telenovelas grow.

But the ratings pecking order can be topsy-turvy. In November, NBC took the fall sweeps contest with a No. 1 ranking, thanks to big audiences brought in by The Voice, Revolution and Sunday Night Football.

DOUGLAS HANKS