Oregon is Intel’s largest site anywhere. The chipmaker employs 20,000 people at its campuses in Washington County, where it develops each new generation of microprocessor and performs advanced research and various sales, marketing and administrative functions.

In Oregon, Intel plans to cut jobs at all its major campuses and across various business units. Nearly 300 of those being laid off initially are categorized as engineers.

(Click here if you can’t see the table of Intel’s initial Oregon layoffs by job title.)

Last month, Intel disclosed plans to lay off 271 employees in California. It notified officials in Arizona on Monday that it plans to lay off 172 people there. Both Oregon and Arizona made the layoff notices public Tuesday morning.

Intel’s shares jumped 7.2% Tuesday, closing at $23.59, while most other semiconductor stocks moved little. It wasn’t clear if Tuesday’s increase was tied to the layoff news, which The Oregonian/OregonLive had reported Monday morning. Intel’s stock has traded between $37.16 and $17.66 in the past year.

Amid a prolonged downturn in sales, new CEO Lip-Bu Tan has mandated broad cuts aimed at reducing Intel’s spending and making the business more efficient. He has stressed the importance of eliminating layers of management across the company, which he says will accelerate decision-making and help make Intel more efficient.

“Removing organizational complexity and empowering our engineers will enable us to better serve the needs of our customers and strengthen our execution,” Intel said Monday in a statement on this week’s layoffs.

Oregon’s pending layoffs include 104 managers and seven vice presidents.

Intel plans to eliminate 450 jobs at its Jones Farm Campus in Hillsboro, by far the largest share of this week’s layoffs. That is a large site home to software, engineering, research and various corporate functions.