For a generation, AT&T and Mexican billionaire Carlos Slim's telephone business stood side by side and grew to become giants of the industry north and south of the Rio Grande.
Now, AT&T Inc's planned $48.5 billion purchase of U.S. satellite provider DirecTV is severing a connection with Slim that goes back to 1990, and turning them into competitors.
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AT&T said on Sunday it would sell its 8.4 percent stake in America Movil, Slim's main cash cow, and withdraw its board members from the company to avoid conflicts of interest with the Mexican's TV operations across Latin America.
News of the divestment hit Slim immediately. America Movil's shares fell more than 5 percent early on Monday, wiping over $3.5 billion off the company's value, although they recovered some ground in late morning trade and were down about 3 percent.
AT&T's chief executive officer, Randall Stephenson, wasted no time in acknowledging that the relationship had changed.
"I learned a lot from Carlos and so, obviously, Carlos and I have spoken and he is a very dear friend, but now he is going to be a competitor and we recognize that and off we go," Stephenson said on a call with investors on Monday.
A spokeswoman for America Movil declined to comment on the deal.
Slim, who was the world's richest man from 2010-2013, has nearly 20 million pay television subscribers in Latin America, putting him squarely into competition with DirecTV, especially in Brazil. He has not yet been allowed into the Mexican pay TV market, however, due to fears he could crush competitors.
DirecTV has 18 million subscribers across Latin America.
"By dumping (America Movil) shares, AT&T can pursue a more aggressive strategy in Latam," BTIG Research analyst Walter Piecyk said on Twitter.
The exit of AT&T from America Movil also creates a potential new rival to Slim in the very telecoms industry where the 74-year-old made his fortune.
America Movil dominates Mexico's telecoms market but the government is carrying out the biggest shake-up of the industry since Slim took control of former state phone monopoly Telmex in the early 1990s. Telmex was swallowed by America Movil, its former mobile unit, in 2011.
Seeking to reduce America Movil's control of 70 percent of the mobile business in Mexico and 80 percent of the fixed line market, the government has rolled out a range of new antitrust measures against Slim and threatened a break-up of his firm.
America Movil's stock hit a near four-year low after the government presented its reform in March 2013, and it remains well below mid-2012 levels. The firm also has capital committed to taking control of Telekom Austria.
There are few telecoms companies with the financial clout to take Slim on in Mexico, where he has for years successfully resisted attempts to cut him down to size.
One of those companies is AT&T, which has had two members as well as one former executive on the 17-strong board of America Movil, a connection dating back to Slim's takeover of Telmex.
In 1990, Slim bought a majority stake in Telmex with France Telecom and Southwestern Bell Corporation, which in 2005 took over former parent ArastT&T and with it, its name. Today, Texas-based AT&T is the biggest telecoms company in North America, while its Mexican peer is the largest in Latin America.
As recently as September, AT&T said it would use its connections with America Movil's network to improve access for corporate clients in 15 Latin American markets including Brazil, Mexico and Argentina.
Still, the two companies are already competing in the United States, where Slim's U.S. business Tracfone Wireless had 25.5 millions subscribers as of end March.
Macquarie analyst Kevin Smithen said that America Movil may now try to make deeper inroads into AT&T's home turf.
"I think we will see that America Movil is now free to enter the U.S. We may see it try to partner with one of the other players be it Sprint, T-Mobile or Dish," Smithen said.
(Additional reporting by Marina Lopes in New York and Elinor Comlay in Mexico City; Writing by Dave Graham; Editing by Kieran Murray)
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