Sony Ericsson made good phones for a decade — then neither parent could move alone

Sony Ericsson, a 50:50 joint venture between Sony and Ericsson formed in 2001, combined Sony's consumer electronics brand with Ericsson's telecommunications expertise. The JV produced successful phones like the Walkman music phone (W800) and the Cyber-shot camera phone (K800i), and at its peak held about 9% of the global phone market.

But the joint venture structure was a strategic liability. Every major decision required agreement from both parents, slowing response times in a market that was moving fast. When the iPhone and Android smartphones arrived, Sony Ericsson was too slow to pivot, caught between Sony's consumer vision and Ericsson's infrastructure focus.

In 2012, Sony bought Ericsson's 50% stake for €1.05 billion and took full control, rebranding as Sony Mobile. But the damage was done: Sony Mobile never regained significant market share and was eventually absorbed into Sony's broader electronics division. The case illustrated how a joint venture can be a good structure for a stable market and a fatal one for a market in disruption.