Exhibit 99.1

Magnachip Reports Results for Third Quarter 2022

SEOUL, South Korea, November 2, 2022 — Magnachip Semiconductor Corporation (NYSE: MX) (“Magnachip” or the “Company”) today announced financial results for the third quarter of 2022.

Commenting on the results for the third quarter of 2022, YJ Kim, Magnachip’s chief executive officer stated, “Our Q3 revenue of $71.2 million was within our guidance range. As we mentioned last quarter, our Display business in the 2^nd half is impacted by supply shortages of 28nm 12-inch OLED wafers that impacted design-in projects from our large panel customer in Korea, which are typically given in advance based on future wafer supply allocation. In addition, China covid lockdowns and the dramatic slowdown in consumer spending due to inflationary pressures reduced demand for smartphones and TVs and resulted in an oversupply of channel inventories, particularly in China. Our Power business also slowed due to lower consumer spending.”

YJ Kim continued, “While the global economic situation remains challenging, our balance sheet is strong, and we are focused on executing a recovery of our Display business. During the quarter, we successfully released our new OLED DDIC sample to our new panel customer and we expect to begin mass production in 2023. In addition, due to the global economic slowdown, we are seeing more wafer capacity availability and we are in discussion with multiple foundries to secure capacity and believe that our 2023 wafer supply will be more than two times higher than 2022. As such, we expect to see a significant recovery of Display business in 2023.”

Q3 2022 Financial Highlights

Q4 2022 Financial Guidance

The Company’s near-term outlook is being challenged by previous OLED wafer allocation constraints that impacted 2^nd half design-in projects, elevated smartphone channel inventories, a pushout of the initial mass production ramp of our new OLED customer and weakening demand in consumer end markets on growing recession fears and cost increases, including labor, due to inflationary pressures. In addition, we estimate our Q4 revenue will be further negatively impacted by approximately $5 million of foreign exchange hedging instruments. While actual results may vary, looking into the next quarter, Magnachip currently expects:

Q3 2022 Earnings Conference Call

Magnachip will host a corresponding conference call at 2:00 p.m. PT / 5:00 p.m. ET on Wednesday, November 2, 2022, to discuss its financial results. In advance of the conference call, all participants must use the following link to complete the online registration process. Upon registering, each participant will receive access details for this event including the dial-in numbers, a PIN number, and an e-mail with detailed instructions to join the conference call. A live and archived webcast of the conference call and a copy of earnings release will be accessible from the ‘Investors’ section of the Company’s website at www.magnachip.com.

Online registration: https://register.vevent.com/register/BIccd8bcc64c4a4092bc5e11273a22e8f2

Safe Harbor for Forward-Looking Statements

Information in this release regarding Magnachip’s forecasts, business outlook, expectations and beliefs are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that involve risks and uncertainties. These statements include expectations about estimated historical or future operating results and financial performance, outlook and business plans, including fourth quarter 2022 revenue and gross profit margin expectations, and the impact of market conditions associated with inflation and rising interest rates, the COVID-19 pandemic or the emergence of various variants of the virus, geopolitical conflict between Russia and Ukraine, and escalated trade tensions and supply constraints on Magnachip’s fourth quarter 2022 and future operating results. All forward-looking statements included in this release are based upon information available to Magnachip as of the date of this release, which may change, and we assume no obligation to update any such forward-looking statements. These statements are not guarantees of future performance and actual results could differ materially from our current expectations. Factors that could cause or contribute to such differences include, among others: the impact of changes in macroeconomic and/or general economic conditions, including those caused by or related to inflation, potential recessions or other deteriorations, economic instability or civil unrest; the COVID-19 pandemic or the emergence of various variants of the virus or other outbreaks of disease, and governmental lock-downs or other measures implemented in response thereto, and the Russia-Ukraine conflict; manufacturing capacity constraints or supply chain disruptions that may impact our ability to deliver our products or affect the price of components, which may lead to an increase in our costs, as well as impacting demand for our products from customers who are similarly affected by such capacity constraints or disruptions; the impact of competitive products and pricing; timely design acceptance by our customers; timely introduction of new products and technologies; ability to ramp new products into volume production; industry wide shifts in supply and demand for semiconductor products; industry and/or company overcapacity; effective and cost efficient utilization of manufacturing capacity; financial stability in foreign markets and the impact of foreign exchange rates; unanticipated costs and expenses or the inability to identify expenses which can be eliminated; compliance with U.S. and international trade and export laws and regulations by us, our customers and our distributors, including those related to the Russia-Ukraine conflict; change or ratification of local or international laws and regulations, including those related to environment, health and safety; public health issues, including the COVID-19 pandemic or the emergence of various variants of the virus; other business interruptions that could disrupt supply or delivery of, or demand for, Magnachip’s products, including uncertainties regarding the impacts of the COVID-19 pandemic or the emergence of various variants of the virus that may result in factory closures, reduced workforces, scarcity of raw materials and goods produced in infected areas, as well as reduced consumer and business spending affecting demand for Magnachip’s products due to government and private sector mandatory business closures, travel restrictions or the like to prevent the spread of disease; and other risks detailed from time to time in Magnachip’s filings with the U.S. Securities and Exchange Commission (the “SEC”), including our Form 10-K filed on February 23, 2022 and subsequent registration statements, amendments or other reports that we may file from time to time with the SEC and/or make available on our website. Magnachip assumes no obligation and does not intend to update the forward-looking statements provided, whether as a result of new information, future events or otherwise.

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About Magnachip Semiconductor

Magnachip is a designer and manufacturer of analog and mixed-signal semiconductor platform solutions for communications, IoT, consumer, computing, industrial and automotive applications. The Company provides a broad range of standard products to customers worldwide. Magnachip, with more than 40 years of operating history, owns a portfolio of approximately 1,100 registered patents and pending applications, and has extensive engineering, design and manufacturing process expertise. For more information, please visit www.magnachip.com. Information on or accessible through Magnachip’s website is not a part of, and is not incorporated into, this release.

CONTACT:

Yujia Zhai

The Blueshirt Group

Tel. (860) 214-0809

Yujia@blueshirtgroup.com

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands of U.S. dollars, except share data)

(Unaudited)

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands of U.S. dollars, except share data)

(Unaudited)

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands of U.S. dollars)

(Unaudited)

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

RECONCILIATION OF OPERATING INCOME (LOSS) TO ADJUSTED OPERATING INCOME (LOSS)

(In thousands of U.S. dollars)

(Unaudited)

We present Adjusted Operating Income (Loss) as a supplemental measure of our performance. We define Adjusted Operating Income (Loss) for the periods indicated as operating income (loss) adjusted to exclude (i) Equity-based compensation expense (ii) Inventory reserve related to Huawei (iii) Merger-related costs and (iv) Other charges, net. For the three and nine months ended September 30, 2022, Other charges, net includes $2.8 million of one-time employee incentives, in each period, and professional service fees and expenses of $0.2 million and $1.0 million, respectively, incurred in connection with certain strategic evaluations, both of which were offset in part by a $0.5 million gain on sale of certain legacy equipment of the closed back-end line in our fabrication facility in Gumi. For the three and nine months ended September 30, 2021, Other charges, net includes professional service fees and expenses of $0.2 million and $3.4 million, respectively, incurred in connection with the regulatory requests.

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED EBITDA AND ADJUSTED NET INCOME

(In thousands of U.S. dollars, except share data)

(Unaudited)

We present Adjusted EBITDA and Adjusted Net Income as supplemental measures of our performance. We define Adjusted EBITDA for the periods indicated as EBITDA (as defined below), adjusted to exclude (i) Equity-based compensation expense, (ii) Foreign currency loss, net, (iii) Derivative valuation gain, net, (iv) Inventory reserve related to Huawei, (v) Merger-related costs and (vi) Other charges, net. EBITDA for the periods indicated is defined as net income (loss) before interest income, net, income tax expense (benefit) and depreciation and amortization.

We prepare Adjusted Net Income by adjusting net income (loss) to eliminate the impact of a number of non-cash expenses and other items that may be either one time or recurring that we do not consider to be indicative of our core ongoing operating performance. We believe that Adjusted Net Income is particularly useful because it reflects the impact of our asset base and capital structure on our operating performance. We define Adjusted Net Income for the periods as net income (loss), adjusted to exclude (i) Equity-based compensation expense, (ii) Foreign currency loss, net, (iii) Derivative valuation gain, net, (iv) Inventory reserve related to Huawei, (v) Merger-related costs, (vi) Other charges, net and (vii) Income tax effect on non-GAAP adjustments.

For the three and nine months ended September 30, 2022, Other charges, net includes $2.8 million of one-time employee incentives, in each period, and professional service fees and expenses of $0.2 million and $1.0 million, respectively, incurred in connection with certain strategic evaluations, both of which were offset in part by a $0.5 million gain on sale of certain legacy equipment of the closed back-end line in our fabrication facility in Gumi. For the three and nine months ended September 30, 2021, Other charges, net includes professional service fees and expenses of $0.2 million and $3.4 million, respectively, incurred in connection with the regulatory requests, both of which were offset in part by a $0.7 million legal settlement gain related to certain expenses incurred in prior periods in connection with our legacy Fab 4 (which was sold during the year ended December 31, 2020) and awarded in the third quarter of 2021.

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