Yamaha, I never knew

[Offshore]

https://www.reliableplant.com/Read/23859/Renault-Nissan-Daimler-cooperation

The two groups also announced an equity exchange that will give the Renault-Nissan Alliance a 3.1 percent stake in Daimler and Daimler a 3.1% in Renault and a 3.1% stake in Nissan.

[Bensien]

https://www.reliableplant.com/Read/23859/Renault-Nissan-Daimler-cooperation

The two groups also announced an equity exchange that will give the Renault-Nissan Alliance a 3.1 percent stake in Daimler and Daimler a 3.1% in Renault and a 3.1% stake in Nissan.

I stand corrected, but the equity exchange was symbolic.Unlike the Nissan/Renault alliance, neither company has any influence on the other at board level or has to account to the other for any decisions that do not affect the joint venture projects.

[TheBear]

Toyota own shares in Yamaha and vice versa. So they share some developments and costs.

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The shares are minimal.  Something like 3%.  They, like so many other companies in the world, share development, etc. because it makes financial sense.  In many cases, there is no ownership "marriage" between the companies at all.  They just agree to sell / buy an engine or gearbox, or whatever makes sense for a specific model as it makes more financial sense.  There are some interesting examples of this.

- Borg Warner gearboxes in Mahindra 4x4s
- Mercedes engines in some Aston Martins
- Mazda BT50 used to be a Ford, now an Isuzu.