Apple is buying part of European chipmaker Dialog Semiconductor in an effort to bring more of its silicon design in-house.

The deal includes $300 million in cash to license some of Dialog’s power management technologies, acquihire 300 engineers, and take control of some assets.

A further $300 million is being committed for products from Dialog over the next three years.

As TechCrunch notes, this is Apple’s biggest acquisition ever when it comes to headcount.

While Apple isn’t acquiring Dialog outright, the 300 engineers make up 16 percent of its total workforce, and are said to have been working closely with Apple on chip design for years.

“Dialog has deep expertise in chip development, and we are thrilled to have this talented group of engineers who’ve long supported our products now working directly for Apple,” hardware SVP Johny Srouji says in a statement.

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