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Germany’s telecom giant is exploring a full tie-up with its US arm in a move that would reshape global telecoms and potentially eclipse every M&A deal ever struck.
Deutsche Telekom is weighing a complete merger with T-Mobile US, widely reported by domestic German outlets and previously first published by Bloomberg, in a deal that could create the world’s most valuable wireless operator and could redefine the future of the European tech champion.
The German group already holds just over 53% of T-Mobile US, making it the dominant shareholder in the American carrier.
Now, according to people familiar with the matter, it is exploring the creation of a new holding company that would make an all-share bid for both firms — folding two publicly listed giants into a single transatlantic entity listed in both the US and Europe.
The combined group could be valued at up to $400bn (€360bn), surpassing the $202.7bn Vodafone-Mannesmann tie-up announced in 1999 — currently the biggest public M&A deal on record, according to London Stock Exchange Group data.
That would make it not just a telecoms story, but a landmark moment in corporate history.
A jewel in Germany’s industrial crown
Deutsche Telekom is no ordinary company in Germany.
Spun out of state-owned Deutsche Bundespost in the mid-1990s, it remains one of Europe’s largest and most strategically important telecoms groups. The German government and state-owned lender KfW own a combined stake of about 28%, making Berlin not just a passive observer but an essential player in any deal.
Any transaction would need their blessing — and that is far from guaranteed.
A full merger would see Berlin’s stake diluted to an estimated 17-18%, potentially falling below the roughly 25% threshold that German authorities have historically treated as the floor for strategic businesses. That could end up being a political problem as much as a financial one.
The irony is that T-Mobile US has become the engine driving Deutsche Telekom’s entire valuation. More than 70% of the German company’s roughly €135bn market value is attributable to its T-Mobile holding.
In effect, Deutsche Telekom’s Frankfurt-listed shares are increasingly just a wrapper around a US wireless business. A full merger would simply make that reality official.
The T-Mobile turnaround story
T-Mobile’s journey under German ownership has been anything but straightforward.
Deutsche Telekom struck a deal to acquire VoiceStream Wireless in 2000 in a transaction initially valued at $50.7bn (€46bn), renaming it T-Mobile USA after the deal closed the following year.
A decade later, the business was haemorrhaging customers and dragging down group earnings. An attempt to sell it to AT&T was blocked by regulators. Instead, Deutsche Telekom listed T-Mobile through a reverse merger with MetroPCS in 2013, then rebuilt its stake over time.
T-Mobile has since grown to become the second-largest US wireless carrier, with a bigger market value than Deutsche Telekom itself and accounting for the majority of the group’s profit.
It is, in short, the success story that saved the parent company.
A holding company with an Irish blueprint
Under one scenario — currently at the level of speculation due to Deutsche Telekom’s refusal to officially confirm or provide any details of the deal — a new holding company would make an all-share offer for both firms, be owned by existing shareholders and list in both the US and Europe, mirroring the structure used in the 2018 merger of industrial gas companies Linde and Praxair, where an Irish holding company served as the neutral vehicle for a transatlantic tie-up.
The holding company would likely be incorporated outside Germany, with Ireland seen as a possible model. Whether Berlin would countenance that is another question.
Regulatory mountain ahead
The obstacles are formidable. Any capital raise would require approval from 75% of Deutsche Telekom’s shareholders.
US Congressman Jim Jordan, chairman of the House Judiciary Committee, said the US government would scrutinise any deal. “A foreign company taking over T-Mobile will get our staff’s attention,” he told Bloomberg.
Antitrust filings, FCC approval and a potential national security review through CFIUS all loom. Talks are widely considered to be at an early stage and may not lead to a deal.
But the very fact that they are happening signals something significant: after 25 years of buying, listing, nearly selling and rebuilding, Deutsche Telekom may finally be ready to bring T-Mobile all the way home.