Separation Agreement and Release, effective July 4, 2020, between Amkor Technology, Inc. and Stephen D. Kelley

In connection with the cessation of my service with Amkor Technology, Inc. (“Company”) as a director, officer and employee, and in order to settle as fully as possible all known and unknown claims I, Stephen D. Kelley, might have against the Company and all related parties, the Company and I enter into this Separation and Release Agreement (“Agreement”) as of June 17, 2020 (the “Separation Date”), and (whether I sign this Agreement or not) I will be paid my accrued, unpaid salary, any accrued, unused paid time off, and any unreimbursed business expenses through such date.

a.Separation Payments and Benefits: The payments that constitute the entire monetary consideration for this Agreement are as follows:

i.Salary Continuation: Starting on the first payroll date following the Effective Date (as defined below), the Company will make separation payments by direct deposit to my designated account in accordance with the Company’s regular payroll practices of the bi-weekly amount of $36,153.85 (which annualizes to $940,000), less all relevant taxes and other withholdings, for a period of thirty months (30) months (such period, the “Payment Period”). In addition, on the first payroll date following the 12 month anniversary of the Effective Date, the Company will make a lump sum payment by direct deposit to my designated account of $470,000, less all relevant taxes and other withholdings. In the event of my death prior to the end of the Payment Period, any unpaid amount of such payments will be accelerated and will be paid to my estate within 10 business days following the date of my death.

ii.Pro Rata Bonus: Within 30 days after the Effective Date, the Company will make a lump sum payment of $1,062,500, being the prorated amount of the Annual Service Bonus (as defined in the letter from the Company to me, dated February 27, 2017, concerning an offer of continued employment (the “Kelley Offer Letter”)) that would otherwise have been due to me in January 2021. In addition, the Company will make a lump sum payment of a prorated performance bonus amount for calendar year 2020 to be determined based on the actual performance bonus, if any, that I would have been paid for 2020 absent the termination of my employment, which will be payable on the date on which the Company pays bonuses for 2020 generally. For this purpose, the discretionary component will be deemed to be the average attainment for the executive officers eligible under the same plan. The Company will make these payments to me by direct deposit to my designated account, less all relevant taxes and other withholdings.

iii.Outplacement Services: The Company will reimburse me for the actual cost of outplacement services used by me for a period of 6 months following the Separation Date. Such payment will be made promptly upon receipt by the Company of reasonable documentation (as determined in the Company’s sole discretion) evidencing the actual cost of such services, but no later than March 15, 2021.

iv.COBRA: Upon my enrollment in COBRA continuation coverage, the Company will pay directly the cost of my COBRA premium for my elected coverage (including eligible dependent coverage) for a period of eighteen (18) months (or if shorter, the maximum period permitted under COBRA) following my Separation Date.

v.Payments: I understand and agree that all of the payments referenced in this Paragraph (a) are in place of any payments otherwise due under the Kelley Offer Letter and will not be taken into account in determining my rights or benefits under any benefit program. The Company will deduct applicable federal and state tax withholding and other amounts from these amounts as it determines it is required to do.

vi.Sufficient Consideration: I acknowledge that the compensation and benefits described in this Paragraph (a) are good, valuable, and sufficient consideration. I further acknowledge that this consideration exceeds that to which I would be entitled under the Company’s policies, procedures, benefit plans, and practices.

b.Release:

was a director, employee or officer of the Company, and (v) those claims that as a matter of law are not waivable by an employee against his or her employer. It is my intention that the language relating to the description of claims in this section shall be given the broadest possible interpretation permitted by law. I further agree that the termination of my employment is not due to “Good Reason” as such term is defined in the Kelley Offer Letter.

c.Applicable Law and Venue: This Agreement is governed by Federal law and the laws of Arizona, without regard to the conflicts of law principles of any jurisdiction. I agree that any action to enforce or interpret this Agreement shall be brought exclusively in a court of competent jurisdiction in the State of Arizona, and I hereby waive any challenge to venue or exercise of jurisdiction by such courts.

d.Effective Date: The “Effective Date” of this Agreement shall be the date the revocation period described in Section (h)(v) below expires, provided that I have not revoked this Agreement. Notwithstanding my revocation of this Agreement, my service as a director, officer and employee of the Company and its subsidiaries shall still be terminated as of the Separation Date.

e.Covenant Not to Sue; Challenge to Validity and Communication with Government Agency:

does not limit my right to receive an award for information provided to any government agencies.

g.Representations and Promises: The Company and I acknowledge and agree that:

i.Separation Date: As of the Separation Date, my service as a director, officer and employee of the Company and each subsidiary and affiliate of the Company terminated and I ceased to be employed by the Company and each subsidiary and affiliate of the Company in any capacity. However, I will continue to provide services to the Company on an as-needed basis as an independent contractor, pursuant to the terms described in Section (f)(i) above.

ii.Equity Vesting: The terms of my outstanding equity awards granted pursuant to the 2007 Equity Plan will remain in effect without modification. For the avoidance of doubt, during the term of my service as an independent contractor to the Company, any equity (including any options, RSUs, restricted stock, or any other form of equity) that has been granted

to me and has not yet vested will continue to vest and be exercisable as provided under the terms of the applicable equity award agreement.

iii.Complete Agreement: This Agreement is the entire agreement relating to any claims or future rights that I might have with respect to the Company and the Released Parties, except for my obligations under the Kelley Offer Letter. Once in effect, this Agreement is a legally admissible and binding agreement.

iv.Amendments; Successors and Assigns: This Agreement only may be amended by a written agreement that the Company and I both sign. The rights and obligations of the Company under this Agreement shall inure to the benefit of and shall be binding upon the successors and assigns of the Company. I shall not be entitled to assign any of my rights or obligations under this Agreement.

v.Representations: When I decided to sign this Agreement, I was not relying on any representations that are not in this Agreement. I have not suffered any job-related wrongs or injuries, such as any type of discrimination, for which I might still be entitled to compensation or relief now or in the future.

vi.No Wrongdoing: This Agreement is not an admission of wrongdoing by the Company or any other Released Party; neither this Agreement nor any drafts shall be admissible evidence of wrongdoing.

vii.Unknown Claims: I am intentionally releasing claims that I do not know that I might have and that, with hindsight, I might regret having released. I have not assigned or given away any of the claims I am releasing.

viii.Effect of Void Provision: If the Company or I successfully assert that any provision in this Agreement is void or otherwise unenforceable, the rest of the Agreement shall remain valid and enforceable to the maximum extent permitted by law, unless the non-asserting party elects to cancel it. If this Agreement is cancelled, I will repay the consideration I received for signing it.

ix.Consideration of Agreement: If I initially did not think any representation I am making in this Agreement was true or if I initially was uncomfortable making it, I resolved all my doubts and concerns before signing this Agreement. I have carefully read this Agreement, I fully understand what it means, I am entering into it knowingly and voluntarily, and all my representations in it are true. The Company would not have agreed to pay me the consideration I am getting in exchange for this Agreement but for my representations and promises I am making by signing it.

x.Confidentiality: I agree that I will not disclose voluntarily or allow anyone else to disclose the existence, reason for, or contents of this Agreement without the Company’s prior written consent, unless required to do so by law. Notwithstanding this provision, I am authorized to disclose this Agreement to my spouse, attorneys, and tax advisors on a “need to know” basis, on the condition that they agree to hold the terms of the Agreement, including the payment

terms, in strictest confidence; provided that I may disclose any information that has been publicly disclosed by the Company. Any disclosure to any third party by my spouse, attorneys, or tax advisors will be treated as a breach by me of the non-disclosure provisions of this paragraph. I am further authorized to make appropriate disclosures as required by law, provided that, unless prohibited by law, I agree to provide the Company with sufficient advance notice prior to disclosure such that the Company may oppose disclosure and to cooperate with the Company in any such efforts. Because it would be difficult or impossible to calculate the actual damages the Company would suffer if I violate my confidentiality obligations, which would be substantial, I agree to pay the Company $5,000 in damages for each violation. For the avoidance of doubt, nothing in this Agreement shall be construed to prohibit or prevent the Company from disclosing this Agreement or the circumstances relating thereto, including without limitation as required by securities law or stock exchange rule. I further agree and acknowledgment that I remain subject to the confidentiality obligations set forth in the Kelley Offer Letter and my Confidentiality, Intellectual Property and Insider Information Obligations Agreement dated March 2, 2017.

xi.Return of Property: I have returned to the Company all files, memoranda, documents, records, copies of the foregoing, Company-provided credit cards, keys, building passes, security passes, access or identification cards, and any other Company property in my possession or control. To the extent I subsequently discover that any property or data identified above is still in my possession, custody or control, I agree to return all such property and data to the Company as soon as practicable, but in no event later than ten (10) days after making such discovery. I have cleared all expense accounts, repaid everything I owe to the Company or any Released Party, paid all amounts I owe on Company-provided credit cards or accounts (such as cell phone accounts), and canceled or personally assumed any such credit cards or accounts. I agree not to incur any expenses, obligations, or liabilities on behalf of the Company.

xii.Non-Competition: I agree that beginning on my Separation Date and for eighteen (18) months thereafter (the “Restriction Period”), I will not, without the prior written consent of the Company, engage in or carry on, directly or indirectly, whether as an advisor, principal, agent, partner, officer, director, employee, stockholder, associate or consultant to any person, partnership, corporation or any other business entity, the business of outsourced semiconductor packaging and test services anywhere in the United States or any other country in which the Company conducts business; provided that ownership by me of Company securities or of less than a five percent equity interest in a publicly held company shall not be a breach of this paragraph.

xiii.Non-Solicitation: I agree that during the Restriction Period, I will not, without the express prior written consent of the Company, directly or indirectly, for myself or on behalf of any other person or entity, (i) solicit or encourage any customer, vendor, client or prospective customer, vendor or client (or anyone who was a customer, vendor or client during the Restriction Period) to cease any relationship with the Company or its affiliates or (ii) solicit or encourage any employee or consultant of the Company or its affiliates (or anyone who was an employee or consultant of the Company or its affiliates during the Restriction Period) to leave the employment of or cease to perform services for the Company or its affiliates; provided that

this paragraph shall not prohibit any general public advertisement or general solicitation for personnel not specifically directed at any employee or consultant of the Company or its affiliates.

xiv.Nondisparagement: I agree that at all times following my Separation Date, I will not make any public statement that are in any way disparaging, derogatory or defamatory regarding the Company, its affiliates, any of the Released Parties or their respective officers, directors, employees, consultants, reputations, products, operations, procedures, policies or services, which are reasonably likely to (i) damage materially the reputation of the Company or its affiliates or any of the Released Parties or (ii) interfere materially with the contracts or business relationships of the Company or its affiliates or any of the Released Parties. “Public statements” mean any statement, whether written or oral, made in any public forum, including in any social media or website. However, nothing in this subsection shall prohibit me from testifying truthfully in any forum or contacting, cooperating with or providing information to any government agency or commission.

xv.Cooperation: I agree that following my Separation Date, I will provide reasonable assistance to and cooperate with the Company and its affiliates as to any claims, controversies, disputes, or complaints of which I have knowledge or that may relate to me or my employment or other relationships with the Company or its affiliates. Such cooperation includes but is not limited to providing the Company and its affiliates with all information known to me related to the foregoing, meeting with counsel, and appearing and giving testimony in any forum. The Company will reimburse me for any reasonable out-of-pocket expenses incurred by me in providing assistance under this Agreement.

xvi.Section 409A: I acknowledge that I and the Company intend that this Agreement be interpreted and administered so that any amount or benefit paid hereunder shall be exempt from or compliant with Section 409A of the Internal Revenue Code of 1986, as amended, and the regulations thereunder (“Section 409A”). If the period between the date I receive this Agreement and the expiration of the revocation period described in Section (h)(v) below begins in one taxable year and ends in another taxable year, payment shall not be made until the beginning of the second taxable year. Notwithstanding the foregoing, neither the Company nor its affiliates nor any of their respective directors, officers, employees and advisors shall be held liable for any taxes, interest or other amounts owed by me as a result of Section 409A. Notwithstanding anything herein to the contrary (i) any “deferred compensation” (as defined in Section 409A) payable hereunder as a result of my termination of employment shall not be paid unless and until I have undergone a “separation from service” (as defined in Section 409A) and (ii) if I am a “specified employee” within the meaning of Section 409A, and a payment or benefit provided for in this Agreement would be subject to additional tax under Section 409A if such payment or benefit is paid within six months after my separation from service, then such payment or benefit shall not be paid (or commence) during the six-month period immediately following my separation from service except as provided in the immediately following sentence. In such event, any payments or benefits that would otherwise have been made or provided during such six-month period and which would have incurred such additional tax under Section 409A shall instead be paid to me in a lump-sum cash payment on the earlier of (i) the first regular payroll date of the seventh month following my separation from service or (ii) the 10th business day

following my death. If any right to payment hereunder is deemed a right to an installment payment, such right shall be treated as a right to a series of separate payments and, accordingly, each installment payment shall at all times be considered a separate and distinct payment for purposes of Section 409A.

xvii.Re-employment: I agree that the Company and its subsidiaries and affiliates are under no obligation to re-employ or engage me in the future in any capacity and that the denial of such re-employment or engagement shall be considered legitimate, proper, and non-discriminatory, as well as an exercise of the Company’s, its subsidiaries, or its affiliates’ rights under this Agreement.

xviii.Headings: I understand that the headings appearing in this Agreement are for convenience only and are not to be considered in interpreting this Agreement.

IN WITNESS WHEREOF, the parties have executed this Agreement on the dates set forth below.

/s/ Stephen D. Kelley

Stephen D. Kelley

Dated: June 25, 2020

Amkor Technology, Inc.:

By: /s/ Mark N. Rogers

Mark N. Rogers

Executive Vice President and General Counsel

Dated: June 26, 2020