FRANKFURT—German publisher Axel Springer SE and broadcaster ProSiebenSat.1 Media AG said they are working on a joint project to promote digital startups but aren't pursuing a tie-up beyond that.

ProSiebenSat.1 and Axel Springer on Wednesday said they plan jointly to promote innovative digital business ideas and startups to enhance the positioning of Germany as a digital hub.

Joint investments in companies and funds, networking of incubator and accelerator programs as well as media for equity investments are planned, they said.

The Wall Street Journal had reported earlier this month that the two companies were in broader talks to combine their businesses. Those discussions, however, faced high hurdles and eventually broke down.

People familiar with the matter pointed to differences over the potential shareholder structure for a combined Springer and ProSieben company. ProSieben's market capitalization of around 10 billion euros ($11.06 billion) would make it the senior partner in a combination with Springer, which is about half as large.

In a reaction to the Journal story, however, Springer said its majority shareholder Friede Springer aimed to keep control over the company in any case. That statement was important because it means the widow of company founder Axel Springer would need to be granted special controlling power over a merged entity to still exert controlling influence.

In a tie-up scenario, her stake would have shrunk from almost 60% in Springer to below 20% in the merged company. Granting Ms. Springer special controlling power in such a situation, would hardly have been compelling for ProSieben shareholders, industry experts have said.

Write to Eyk Henning at eyk.henning@wsj.com

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