Exhibit 99.1

Magnachip Reports Results for Fourth Quarter and Year 2021

SEOUL, South Korea, February 16, 2022 — Magnachip Semiconductor Corporation (NYSE: MX) (“Magnachip” or the “Company”) today announced financial results for the fourth quarter and full-year 2021.

Commenting on the results for the fourth quarter of 2021, YJ Kim, Magnachip’s chief executive officer stated, “For the fourth quarter, the demand and signals from our customers remained strong across the board. However, severe supply constraints continued to significantly limit our OLED revenue potential, which was partially offset by strong Power business. We reported $110.3 million in revenue and 31 cents in non-GAAP diluted EPS for the fourth quarter.”

Commenting on the full-year, YJ stated, “While our 2021 revenue was negatively impacted by continuing supply shortages, especially for 28nm 12” OLED wafers, we delivered higher profitability in all of our key measures in 2021 compared to 2020. In addition, our team at Magnachip achieved critical milestones to fuel future growth; we broadened our customer base, further penetrated new applications, and enhanced our supply chain for additional manufacturing capacity, which is expected to come online in the later part of 2022. While our near-term outlook is still being challenged by persisting supply constraints, these developments reinforce our confidence and optimism about our long-term growth.”

Q4 and 2021 Financial Highlights

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Q1 2022 Financial Guidance

Our near-term outlook is still being challenged by persisting supply constraints especially for 28nm 12” wafers. While actual results may vary, looking into the next quarter, which typically presents seasonal softness, Magnachip anticipates Q1 2022 to be the bottom and currently expects:

Q4 2021 Earnings Conference Call

Magnachip will host a conference call at 5 p.m. Eastern Time on February 16, 2022. The conference call will be webcast live and also is available by dialing toll-free at 1-844-536-5472. International call-in participants can dial 1-614-999-9318. The conference ID number is 1582546. Participants are encouraged to initiate their calls at least 10 minutes in advance of the 5 p.m. Eastern Time start time to ensure a timely connection. The webcast and earnings release will be accessible at www.magnachip.com. A replay of the conference call will be available the same day and will run for 72 hours. The replay dial-in numbers are 1-404-537-3406 or toll-free at 1-855-859-2056. The access code is 1582546.

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 first quarter 2022 revenue and gross profit margin expectations, and the impact of the COVID-19 pandemic or the emergence of various variants of the virus, escalated trade tensions and supply constraints on Magnachip’s first 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 the COVID-19 pandemic or the emergence of various variants of the virus, other outbreaks of disease, recessions, economic instability or civil unrest; manufacturing capacity constraints or supply chain 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 or supply constraints; 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; 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 March 9, 2021 (amended on April 30, 2021), our Form 10-Qs filed on May 10, 2021, August 6, 2021 and November 5, 2021 (including that the impact of the COVID-19 pandemic, trade tensions and supply constraints may also exacerbate the risks discussed therein) 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 1,150 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.

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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 TO ADJUSTED OPERATING INCOME

(In thousands of U.S. dollars)

(Unaudited)

We present Adjusted Operating Income as a supplemental measure of our performance. We define Adjusted Operating Income for the periods indicated as operating income adjusted to exclude (i) Equity-based compensation expense, (ii) Inventory reserve related to Huawei impact of downstream trade restrictions, (iii) Expenses related to Fab 3 power outage, (iv) Merger-related costs (income), net and (v) Early termination and other charges, net.

For the year ended December 31, 2021, we recorded in our consolidated statement of operations net gain of $35,527 thousand that represented income of $70,200 thousand from the recognition of a reverse termination fee, net of professional service fees and expenses of $34,673 thousand incurred in connection with the contemplated merger transaction of the Company that was terminated in December 2021. For the same period, we also recorded $3,430 thousand of non-recurring professional service fees and expenses incurred in connection with the regulatory requests, partially offset by $1,419 thousand gain on sale of certain legacy equipment of the closed back-end line in our fabrication facility in Gumi (which was closed during the year ended December 31, 2018).

For the year ended December 31, 2020, we recorded in our consolidated statement of operations $4,422 thousand of early termination and other charges, net, in connection with the headcount reduction program offered and paid to the employees during the fourth quarter of 2020. During the same period, we also recorded $554 thousand of non-recurring professional service fees and expenses incurred in connection with certain treasury and finance initiatives.

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

RECONCILIATION OF NET INCOME 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 (gain), net, (iii) Derivative valuation loss (gain), net, (iv) Loss on early extinguishment of borrowings, net, (v) Inventory reserve related to Huawei impact of downstream trade restrictions, (vi) Expenses related to Fab 3 power outage, (vii) Merger-related costs (income), net and (viii) Early termination and other charges, net.

EBITDA for the periods indicated is defined as Income from continuing operations before interest expense, net, income tax expense (benefit) and depreciation and amortization. We prepare Adjusted Net Income by adjusting income from continuing operations 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 income from continuing operations, adjusted to exclude (i) Equity-based compensation expense, (ii) Foreign currency loss (gain), net, (iii) Derivative valuation loss (gain), net, (iv) Loss on early extinguishment of borrowings, net, (v) Inventory reserve related to Huawei impact of downstream trade restrictions, (vi) Expenses related to Fab 3 power outage, (vii) Merger-related costs (income), net, (viii) Early termination and other charges, net, (ix) GAAP and cash tax expense difference and (x) Income tax effect on non-GAAP adjustments.

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For the year ended December 31, 2021, we recorded in our consolidated statement of operations net gain of $35,527 thousand that represented income of $70,200 thousand from the recognition of a reverse termination fee, net of professional service fees and expenses of $34,673 thousand incurred in connection with the contemplated merger transaction of the Company that was terminated in December 2021. For the same period, we also recorded $3,430 thousand of non-recurring professional service fees and expenses incurred in connection with the regulatory requests, partially offset by $1,419 thousand gain on sale of certain legacy equipment of the closed back-end line in our fabrication facility in Gumi (which was closed during the year ended December 31, 2018 and $727 thousand 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.

For the year ended December 31, 2020, we recorded in our consolidated statement of operations $4,422 thousand of early termination and other charges, net in connection with the headcount reduction program offered and paid to the employees during the fourth quarter of 2020. During the same period, we also recorded $554 thousand of non-recurring professional service fees and expenses incurred in connection with certain treasury and finance initiatives.

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