Westwood One

Dial Global was founded as X Radio Networks, a division of Excelsior Radio Networks. It merged with Dial Communications and Global Media in 2006, from which it derived the Dial Global name. Dial Global initially specialized in syndicated weekend music programs of various types. In 2007 it acquired the former Transtar Radio Networks from the original Westwood One. Triton Media Group, a subsidiary of Oaktree Capital Management, purchased Excelsior in early 2008, and soon bought two of its three main competitors: Waitt Radio Networks and Jones Radio Networks. Triton used the Dial Global name for all of its programming and later bought the remainder of Westwood One in 2011, folding it into its Dial Global subsidiary.

Dial Global began exhibiting signs of financial distress in late 2012, a possible side effect of its numerous acquisitions. On November 15 of that year, Dial Global announced a disappointing third quarter that it attributed in part to the financial impact of its exposure to the controversy surrounding a certain controversial talk personality, which was widely assumed to be a veiled reference to Rush Limbaugh in the wake of the Rush Limbaugh–Sandra Fluke controversy (although Limbaugh has no direct association with Dial Global). It simultaneously announced that it had filed for delisting from NASDAQ. At the time of the announcement, Dial Global stock was trading at $2.00 a share; by mid-January 2013, DG's stock was trading at.30 a share. In a SEC 8-K filing dated January 15, 2013, DG announced that it had extended a loan waiver agreement with certain lenders.

On August 29, 2013, Cumulus Broadcasting announced its intent to acquire Dial Global for $260 million, and merge it into its existing Cumulus Media Networks division. To fund the sale, Cumulus sold 53 radio stations to Townsquare Media (a radio broadcasting company owned by Oaktree), and traded 15 more stations to Townsquare in exchange for a cluster in Fresno, California, formerly owned by Peak Broadcasting—which was also being acquired by Townsquare.

On September 4, 2013, ahead of the completion of the purchase, Dial Global announced that it would rename itself Westwood One, citing stronger name recognition. The sale was completed on December 12, 2013. As a result of all of these acquisitions, Cumulus Media now controls the remnants of all four of the major networks from the Golden Age of Radio: the former NBC Radio Network, the Mutual Broadcasting System, the distribution rights to most of CBS, the former ABC Radio Network, and CBS Sports Radio (CBS Radio owned stations, but were merged with Entercom on November 17, 2017; ABC, which still owns a few stations outside its original network primarily for ESPN Radio as of December 18, 2015, until 2023, pulled its content from Cumulus on January 1, 2015; and NBC, after having its content dropped from Westwood One in 2015, moved its content to iHeartMedia in 2016.) Among the numerous other holdings Cumulus now controls are the libraries of Transtar, RKO, Waitt, Jones, BPI, Watermark, and Drake-Chenault.

The company's numerous acquisitions prompted rival Talk Radio Network to file an antitrust lawsuit against what was then Dial Global in August 2012. Cumulus settled the lawsuit with TRN on amicable terms in March 2014, which was followed by TRN filing another lawsuit over the issue in April 2016. Cumulus won the lawsuit in late 2017, and TRN ceased operations at the end of that year.

By 2015, Westwood One had been fully integrated into Cumulus Media Networks, with Westwood One as the surviving brand. The merger resulted in layoffs from its Westwood One's facilities in Colorado, including some of its in-house airstaff (who would be offered vacant positions at Cumulus stations). The company stated that it planned to leverage talent from Cumulus's local stations (particularly in major markets) for its 24-hour formats.

Cumulus filed for Chapter 11 bankruptcy protection in November 2017. In January 2018, it began moving to terminate its broadcast contracts, including those through Westwood One. It emerged from bankruptcy protection in June 2018. Triton Media Group, by this point rebranded as Triton Digital, was spun off to The E. W. Scripps Company in October 2018; as Scripps does not operate radio stations (it had a brief foray in the medium after its acquisition of Journal Media Group, but divested its stations in 2018), the radio-related assets remain in the possession of Westwood One.

On March 5, 2026, Cumulus Media filed for Chapter 11 bankruptcy for the second time in nearly a decade, listing assets and liabilities between $1 billion and $10 billion.