Fully depreciated simply mean you can’t charge depreciation expenses against your revenues, an accounting trick only. In reality the costs of the factories are a sunk cost, they have no bearings on the cashflow.
The Shanghai fab is a 12-inch one which means the day-to-day production cost is much lower than the old 6-inch and 8-inch fabs in Europe. The capacity of the Shanghai fab is 2-3x of the entire European operation according to this podcast:
Might as well use this opportunity to get rid of the European operations except sales and support.
Prior to the Dutch seizure of Nexperia, Wingtech fully owned and control the Nexperia fabs.
As such, they would want to run all their fabs at maximum capacity and would factor in depreciation/financing costs.
There was an announcement of a $200 million investment for the Hamburg plant in June 2024
Given that Nexperia only accounts for 5% of the market, there is ample scope for Wingtech/Nexperia to run all their fabs at maximum capacity.
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In terms of the situation now, I think regaining control is still the best option and Wingtech's preferred goal.
But if this doesn't work, then yes, it is best to get rid of the European operations.
However, note that the European plants are likely to still be worth billions in terms of semiconductor equipment