| 2026-04-29 | 10-Q | 10.1 | Change in Control Severance Agreement, dated April 7, 2026, by and between Parsons Corporation and Soo Lagasse. |
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| 2026-02-11 | 10-K | 10.76 | Sixteenth Amendment To The Parsons Corporation Retirement Savings Plan (2017 Amendment and Restatement) |
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| 2026-02-11 | 10-K | 10.75 | Fifteenth Amendment To The Parsons Corporation Retirement Savings Plan (2017 Amendment and Restatement) |
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| 2026-02-11 | 10-K | 10.74 | Fourteenth Amendment To The Parsons Corporation Retirement Savings Plan (2017 Amendment and Restatement) |
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| 2026-02-11 | 10-K | 10.73 | Thirteenth Amendment To The Parsons Corporation Retirement Savings Plan (2017 Amendment and Restatement) |
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| 2026-02-11 | 10-K | 10.72 | Twelfth Amendment To The Parsons Corporation Retirement Savings Plan (2017 Amendment and Restatement) |
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| 2025-06-05 | 8-K | 10.2 | Revolving Credit Agreement, dated as of June 5, 2025, among Parsons Corporation, the subsidiary guarantors, the several banks and other financial institutions party thereto as the revolving lenders, and Bank of America, N.A., as administrative agent for the revolving lenders. |
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| 2025-06-05 | 8-K | 10.1 | Term Loan Credit Agreement, dated as of June 5, 2025, among Parsons Corporation as borrower, the several subsidiary guarantors, the several banks and other financial institutions party thereto as term loan lenders, and Bank of America, N.A., as administrative agent for the term loan lenders. |
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| 2025-02-19 | 10-K | 10.71 | Eleventh Amendment To The Parsons Corporation Retirement Savings Plan (2017 Amendment and Restatement) |
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| 2024-07-31 | 10-Q | 10.2 | Seventh Amendment To The Parsons Employee Stock Ownership Plan 2019 Amendment and Restatement |
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| 2024-07-31 | 10-Q | 10.1 | Tenth Amendment To The Parsons Corporation Retirement Savings Plan (2017 Amendment and Restatement) |
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| 2024-05-01 | 10-Q | 10.1 | Form of Confirmations of Base and Additional Call Option Transactions, between Parsons Corporation and the Option Counterparties. |
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| 2024-02-27 | 8-K | 10.1 | Form of Confirmations of Base and Additional Call Option Transactions, between Parsons Corporation and the Option Counterparties. |
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| 2023-02-17 | 10-K | 10.67 | Sixth Amendment to The Parsons Employee Stock Ownership Plan 2019 Amendment and Restatement. |
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| 2023-02-17 | 10-K | 10.65 | Seventh Amendment to The Parsons Corporation Retirement Savings Plan (2017 Amendment and Restatement). |
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| 2023-02-17 | 10-K | 10.64 | Xator Purchase Agreement. |
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| 2022-05-04 | 10-Q | 10.1 | Form of Fifth Amendment to the Parsons Employee Stock Ownership Plan 2019 Amendment and Restatement. |
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| 2022-02-23 | 10-K | 10.62 | Form of Transition Agreement, dated February 2022, by and between Parsons Corporation and Charles L. Harrington. |
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| 2022-02-23 | 10-K | 10.60 | Fourth Amendment to the Parsons Employee Stock Ownership Plan 2019 Amendment and Restatement, effective March 1, 2021. |
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| 2022-02-23 | 10-K | 10.48 | Form of Restricted Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and David Spille. |
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| 2022-02-23 | 10-K | 10.47 | Form of Performance Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and David Spille. |
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| 2022-02-23 | 10-K | 10.46 | Form of Restricted Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and Michael R. Kolloway. |
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| 2022-02-23 | 10-K | 10.45 | Form of Performance Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and Michael R. Kolloway. |
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| 2022-02-23 | 10-K | 10.44 | Form of Restricted Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and George Ball. |
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| 2022-02-23 | 10-K | 10.43 | Form of Performance Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and George Ball. |
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| 2022-02-23 | 10-K | 10.42 | Form of Restricted Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and Charles L. Harrington. |
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| 2022-02-23 | 10-K | 10.41 | Form of Performance Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and Charles L. Harrington. |
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| 2022-02-23 | 10-K | 10.40 | Form of Restricted Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and Carey A. Smith. |
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| 2022-02-23 | 10-K | 10.39 | Form of Performance Stock Unit Award Amendment, dated July 19, 2021, by and between Parsons Corporation and Carey A. Smith. |
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| 2022-02-23 | 10-K | 10.33 | Change in Control Severance Agreement, dated October 6, 2021, by and between Parsons Corporation and Matthew Ofilos. |
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| 2022-02-23 | 10-K | 10.32 | Change in Control Severance Agreement, dated August 6, 2021, by and between Parsons Corporation and David Spille. |
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| 2022-02-23 | 10-K | 10.31 | Change in Control Severance Agreement, dated August 6, 2021, by and between Parsons Corporation and Michael Kolloway. |
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| 2022-02-23 | 10-K | 10.30 | Change in Control Severance Agreement, dated August 6, 2021, by and between Parsons Corporation and George Ball |
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| 2022-02-23 | 10-K | 10.29 | Change in Control Severance Agreement, dated August 9, 2021, by and between Parsons Corporation and Charles L. Harrington. |
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| 2022-02-23 | 10-K | 10.28 | Change in Control Severance Agreement, dated August 6, 2021, by and between Parsons Corporation and Carey Smith. |
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| 2022-02-23 | 10-K | 10.25 | Parsons Corporation Employee Stock Purchase Plan List of Participating Companies. |
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| 2022-02-23 | 10-K | 10.24 | Parsons Corporation Employee Stock Purchase Plan Special Offering Period dated November 1, 2021. |
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| 2022-02-23 | 10-K | 10.23 | Parsons Corporation Prospectus to Employee Stock Purchase Plan dated November 1, 2021. |
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| 2022-02-23 | 10-K | 10.10 | Parsons Corporation Annual Incentive Plan Amendment dated January 1, 2021. |
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| 2021-02-24 | 10-K | 10.42 | Form of Fourth Amendment to the 2019 Amendment and Restatement of Parsons Employee Stock Ownership Plan, effective March 1, 2021. |
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| 2021-02-24 | 10-K | 10.41 | Form of Fifth Amendment to the Parsons Corporation Retirement Savings Plan. |
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| 2021-02-24 | 10-K | 10.39 | Form of Employee Stockownership Trust Agreement, dated as of June 8, 2020, by and between Parsons Corporation and Newport Trust Company. |
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| 2021-02-24 | 10-K | 10.32 | Form of Equity Award Amendment Letter Agreement, dated August 10, 2020, by and between Parsons Corporation and Debra Fiori. |
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| 2021-02-24 | 10-K | 10.31 | Form of Equity Award Amendment Letter Agreement, dated August 10, 2020, by and between Parsons Corporation and Michael R. Kolloway. |
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| 2021-02-24 | 10-K | 10.30 | Form of Equity Award Amendment Letter Agreement, dated August 10, 2020, by and between Parsons Corporation and Carey A. Smith. |
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| 2021-02-24 | 10-K | 10.29 | Form of Equity Award Amendment Letter Agreement, dated August 10, 2020, by and between Parsons Corporation and Charles L. Harrington. |
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| 2021-02-24 | 10-K | 10.28 | Form of Equity Award Amendment Letter Agreement, dated August 10, 2020, by and between Parsons Corporation and George L. Ball. |
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| 2021-02-24 | 10-K | 10.23 | First Amendment to the SERP effective January 1, 2020. |
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| 2021-02-24 | 10-K | 10.22 | Supplemental Executive Retirement Plan dated January 1, 1997. |
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| 2021-02-24 | 10-K | 10.19 | Parsons Corporation Non-Employee Director Compensation Policy (as amended effective April 21, 2020). |
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| 2021-02-24 | 10-K | 10.15 | Third Amendment to the 2019 Amendment and Restatement of Parsons Employee Stock Ownership Plan, effective January 1, 2021. |
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| 2021-02-24 | 10-K | 10.9 | Parsons Corporation Annual Incentive Plan Amended as of October 19, 2020. |
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| 2021-02-24 | 10-K | 10.8 | Parsons Corporation Annual Incentive Plan dated January 1, 2020. |
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| 2021-02-24 | 10-K | 10.3 | First Amendment to the 2019 Amendment and Restatement of Parsons Employee Stock Ownership Plan, effective January 1, 2020 |
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| 2020-03-10 | 10-K | 10.32 | Adam Taylor Separation Agreement. |
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| 2020-03-10 | 10-K | 10.19 | Parsons Corporation Employee Stock Purchase Plan. |
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| 2020-03-10 | 10-K | 10.17 | Parsons Corporation Non-Employee Director Compensation Policy (as amended effective July 15, 2019. |
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| 2020-03-10 | 10-K | 10.16 | Form of Restricted Stock Unit Agreement under the Parsons Corporation Incentive Award Plan (for Non-Employee Director Awards in 2019). |
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| 2020-03-10 | 10-K | 10.15 | Form of Restricted Stock Unit Agreement under the Parsons Corporation Incentive Award Plan (for Non-Employee Director Fee Deferral Awards commencing in 2020). |
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| 2020-03-10 | 10-K | 10.14 | Form of Restricted Stock Unit Agreement under the Parsons Corporation Incentive Award Plan (for Non-Employee Director Awards commencing in 2020). |
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| 2020-03-10 | 10-K | 10.12 | Form of Restricted Stock Unit Agreement under the Parsons Corporation Incentive Award Plan. |
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| 2020-03-10 | 10-K | 10.3 | First Amendment to the 2019 Amendment and Restatement of Parsons Employee Stock Ownership Plan, effective May 8, 2019. |
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