TUTOR PERINI CORP

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(1)Basis of Presentation

The Condensed Consolidated Financial Statements do not include footnotes and certain financial information normally presented annually under generally accepted accounting principles in the United States (“GAAP”). Therefore, they should be read in conjunction with the audited consolidated financial statements and the related notes included in Tutor Perini Corporation’s (the “Company”) Annual Report on Form 10-K for the year ended December 31, 2024. The results of operations for the three and nine months ended September 30, 2025 may not be indicative of the results that will be achieved for the full year ending December 31, 2025.

In the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements reflect all adjustments, including those of a normal recurring nature, necessary to present fairly the Company’s condensed consolidated financial position as of September 30, 2025 and its condensed consolidated statements of operations and cash flows for the interim periods presented. Intercompany balances and transactions have been eliminated. Certain amounts in the condensed consolidated financial statements and notes thereto of prior years have been reclassified to conform to the current year presentation.

(2)Recent Accounting Pronouncements

In December 2023, the FASB issued ASU 2023-09, Income Taxes (“Topic 740”): Improvements to Income Tax Disclosures (“ASU 2023-09”), which requires public entities to disclose specific categories in its annual effective tax rate reconciliation and disaggregated information about significant reconciling items by jurisdiction and by nature. ASU 2023-09 also requires entities to disclose their income tax payments (net of refunds) to international, federal, and state and local jurisdictions. This guidance is effective for annual reporting periods beginning after December 15, 2024, and requires prospective application with the option to apply it retrospectively. Early adoption is permitted. Adoption of this new guidance will result in increased disclosures in the Income Taxes footnote of the Company’s Notes to Consolidated Financial Statements, but will not have an impact on the consolidated financial position, results of operations or cash flows.

In November 2024, the FASB issued ASU 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (“Subtopic 220-40”): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which requires public entities to disclose additional information about specific expense categories in the notes to the financial statements on an interim and annual basis. This guidance is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

(3)Revenue

Disaggregation of Revenue

The following tables disaggregate revenue by segment, end market, customer type and contract type, which the Company believes best depict how the nature, amount, timing and uncertainty of its revenue and cash flows are affected by economic factors for the three and nine months ended September 30, 2025 and 2024.

(a)The three and nine-month periods ended September 30, 2024 include the negative impact of a $101.6 million adjustment related to an adverse arbitration ruling on a completed Civil segment bridge project in California, of which $79.4 million was a reversal of previously recognized revenue. Refer to Note 19, Business Segments, for additional details.

Changes in Contract Estimates that Impact Revenue

Changes to the total estimated contract revenue or cost for a given project, either due to unexpected events or revisions to management’s initial estimates, are recognized in the period in which they are determined. Revenue was negatively impacted by $23.6 million and $26.6 million during the three and nine months ended September 30, 2025, respectively, due to performance obligations satisfied (or partially satisfied) in prior periods. Revenue was negatively impacted by $163.5 million and $180.4 million during the three and nine months ended September 30, 2024, respectively, due to performance obligations satisfied (or partially satisfied) in prior periods. Refer to Note 19, Business Segments, for additional details on significant adjustments.

Remaining Performance Obligations

Remaining performance obligations represent the transaction price of firm orders for which work has not been performed and exclude unexercised contract options. As of September 30, 2025, the aggregate amounts of the transaction prices allocated to the remaining performance obligations of the Company’s construction contracts were $10.2 billion, $5.2 billion and $2.5 billion for the Civil, Building and Specialty Contractors segments, respectively. As of September 30, 2024, the aggregate amounts of the transaction prices allocated to the remaining performance obligations of the Company’s construction contracts were$4.1 billion, $3.2 billion and $1.3 billion for the Civil, Building and Specialty Contractors segments, respectively. The Company typically recognizes revenue on Civil segment projects over a period ofthree tofive years, whereas for projects in the Building and Specialty Contractors segments, the Company typically recognizes revenue over a period ofone tothree years.

(4)Contract Assets and Liabilities

The Company classifies contract assets and liabilities that may be settled beyond one year from the balance sheet date as current, consistent with the length of time of the Company’s project operating cycle.

Contract assets and liabilities on the Condensed Consolidated Balance Sheets consisted of the following:

Costs and estimated earnings in excess of billings represent the excess of contract costs and profits (or contract revenue) over the amount of contract billings to date and are classified as a current asset. Costs and estimated earnings in excess of billings result when either: (1) the appropriate contract revenue amount has been recognized over time in accordance with Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with Customers (“ASC 606”), but a portion of the revenue recorded cannot be billed currently due to the billing terms defined in the contract, or (2) costs are incurred related to certain claims and unapproved change orders. Claims occur when there is a dispute regarding both a change in the scope of work and the price associated with that change. Unapproved change orders occur when a change in the scope of work results in additional work being performed before the parties have agreed on the corresponding change in the contract price. The Company routinely estimates recovery related to claims and unapproved change orders as a form of variable consideration at the most likely amount it expects to receive and to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Claims and unapproved change orders are billable upon the agreement and resolution between the contractual parties and after the execution of contractual amendments. Increases in claims and unapproved change orders typically result from costs being incurred against existing or new positions; decreases normally result from resolutions and subsequent billings. As discussed in Note 12, Commitments and Contingencies, the resolution of these claims and unapproved change orders may require litigation or other forms of dispute resolution proceedings. Other unbilled costs and profits are billable in accordance with the billing terms of each of the existing contractual arrangements and, as such, the timing of contract billing cycles can cause fluctuations in the balance of unbilled costs and profits. Ultimate resolution of other unbilled costs and profits typically involves incremental progress toward contractual requirements or milestones. The amount of costs and estimated earnings in excess of billings as of September 30, 2025 estimated by management to be collected beyond one year is approximately $513.4 million.

Billings in excess of costs and estimated earnings represent the excess of contract billings to date over the amount of contract costs and profits (or contract revenue) recognized to date. The balance may fluctuate depending on the timing of contract billings and the recognition of contract revenue. Revenue recognized during the three and nine months ended September 30, 2025 and included in the opening billings in excess of costs and estimated earnings balances for each period totaled $784.3 million and $886.9 million, respectively. Revenue recognized during the three and nine months ended September 30, 2024 and included in the opening billings in excess of costs and estimated earnings balances for each period totaled $534.2 million and $891.4 million, respectively.

(5)Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts shown in the Condensed Consolidated Statements of Cash Flows:

Cash equivalents include short-term, highly liquid investments with maturities of three months or less when acquired. Cash and cash equivalents consist of amounts available for the Company’s general purposes, the Company’s proportionate share of cash held by the Company’s unconsolidated joint ventures and 100% of amounts held by the Company’s consolidated joint ventures. In both cases, cash held by joint ventures is available only for joint venture-related uses, including future distributions to joint venture partners.

Restricted cash includes amounts primarily held as collateral to secure insurance-related contingent obligations, such as insurance claim deductibles, in lieu of letters of credit.

(6)Other Current Assets

Other current assets consist of the following:

Capitalized contract costs are included in other current assets and primarily represent costs to fulfill a contract that (1) directly relate to an existing or anticipated contract, (2) generate or enhance resources that will be used in satisfying performance obligations in the future and (3) are expected to be recovered through the contract. Capitalized contract costs, which are primarily comprised of prepaid insurance premiums, are generally expensed to the associated contract over the period of anticipated use on the project. During the three and nine months ended September 30, 2025, $36.3 million and $68.7 million, respectively, of previously capitalized contract costs were amortized and recognized as expenseon the related contracts. During the three and nine months ended September 30, 2024, $15.1 million and $47.0 million, respectively, of previously capitalized contract costs were amortized and recognized as expenseon the related contracts.

(7)Earnings Per Common Share

Basic earnings per common share (“EPS”) and diluted EPS are calculated by dividing net income (loss) attributable to Tutor Perini Corporation by the following: for basic EPS, the weighted-average number of common shares outstanding during the period; and for diluted EPS, the sum of the weighted-average number of both outstanding common shares and potentially dilutive securities, which for the Company can include restricted stock units (“RSUs”) and unexercised stock options. The Company calculates the effect of the potentially dilutive RSUs and stock options using the treasury stock method.

For the three and nine months ended September 30, 2024, all outstanding RSUs and stock options were excluded from the calculation of weighted-average diluted shares outstanding, as the shares have an anti-dilutive effect due to the net loss for the periods.

Refer to Note 19, Business Segments, for additional details on significant impacts to net income (loss) and diluted EPS.

(8)Income Taxes

The Company recognized income tax expense of $15.2 million and $50.0 million for the three and nine months ended September 30, 2025, respectively. The effective income tax rate was 44.6% and 31.5% for the three and nine months ended September 30, 2025, respectively. The effective income tax rate for both the three and nine months ended September 30, 2025 was higher than the 21.0% federal statutory income tax rate primarily due to non-deductible expenses and state income taxes (net of federal tax benefit), partially offset by earnings attributable to noncontrolling interests (for which income taxes are not the responsibility of the Company) and federal income tax credits.

The Company recognized an income tax benefit of $33.9 million and $19.4 million for the three and nine months ended September 30, 2024, respectively. The effective income tax rate was 27.5% and 29.6% for the three and nine months ended September 30, 2024, respectively. The effective income tax rate for both the three and nine months ended September 30, 2024 was higher than the 21.0% federal statutory income tax rate primarily due to earnings attributable to noncontrolling interests (for which income taxes are not the responsibility of the Company) and state income taxes (net of the federal tax benefit), partially offset by non-deductible expenses.

On July 4, 2025, H.R.1, commonly known as the One Big Beautiful Bill Act, was enacted, which includes a broad range of tax reform provisions. The legislation includes several provisions that may impact the timing and magnitude of certain tax deductions. Key provisions include the permanent extension of several business tax benefits originally introduced under the 2017 Tax Cuts and Jobs Act. The Company is evaluating the impact of the new legislation but does not expect it to have a material impact on its consolidated financial statements.

(9)Goodwill and Intangible Assets

Goodwill

The following table presents the changes in the carrying amount of goodwill since its inception through September 30, 2025:

The Company performed its annual impairment test in the fourth quarter of 2024 and concluded goodwill wasnot impaired. In addition, the Company determined that no triggering events occurred and no circumstances changed since the date of its annual impairment test that would more likely than not reduce the fair value of the Civil reporting unit below its carrying amount.

The Company will continue to monitor events and circumstances for changes that indicate the Civil reporting unit goodwill would need to be reevaluated for impairment during future interim periods prior to the annual impairment test. These future events and circumstances include, but are not limited to, changes in the overall financial performance of the Civil reporting unit, as well as other quantitative and qualitative factors which could indicate potential triggering events for possible impairment.

Intangible Assets

Intangible assets consist of the following:

Amortization expense related to amortizable intangible assets for each of the three and nine months ended September 30, 2025 and 2024 was $0.6 million and $1.7 million, respectively. As of September 30, 2025, future amortization expense related to amortizable intangible assets will be approximately $0.6 million for the remainder of 2025, $2.2 million per year for the years 2026 through 2030 and $2.4 million thereafter.

The Company performed its annual impairment test for non-amortizable trade names during the fourth quarter of 2024. Based on this assessment, the Company concluded that its non-amortizable trade names were not impaired. In addition, the Company determined that no triggering events occurred and no circumstances changed since the date of its annual impairment test that would indicate impairment of its non-amortizable trade names. Other amortizable intangible assets are reviewed for impairment whenever circumstances indicate that the future cash flows generated by the assets might be less than the assets’ net carrying value. The Company hadno impairment of intangible assets during the three and nine months ended September 30, 2025 or 2024.

(10)Financial Commitments

Long-Term Debt

Long-term debt as reported on the Condensed Consolidated Balance Sheets consisted of the following:

The following table reconciles the outstanding debt balances to the reported debt balances as of September 30, 2025 and December 31, 2024:

The unamortized issuance costs related to the Revolver were $1.0 million and $1.4 million as of September 30, 2025 and December 31, 2024, respectively, and are included in other assets on the Condensed Conso lidated Balance Sheets.

2024 Senior Notes

On April 22, 2024, the Company issued $400.0 million in aggregate principal amount of 11.875% Senior Notes due April 30, 2029 (the “2024 Senior Notes”) in a private placement offering. Interest on the 2024 Senior Notes is payable in arrears semi-annually in April and October of each year, beginning in October 2024. The proceeds from the 2024 Senior Notes were used to redeem the 2017 Senior Notes (as discussed below).

Prior to April 30, 2026, the Company may redeem the 2024 Senior Notes at a redemption price equal to 100% of the principal amount plus a “make-whole” premium described in the indenture. In addition, prior to April 30, 2026, the Company may redeem up to 40% of the original aggregate principal amount of the 2024 Senior Notes at a redemption price of 111.875% of their principal amount with the “net cash proceeds” received by the Company from one or more equity offerings, as described in the indenture. On or after April 30, 2026, the Company may redeem the 2024 Senior Notes at specified redemption prices described in the indenture. If the Company experiences certain change of control events, holders of the 2024 Senior Notes may require the Company to repurchase all or part of the 2024 Senior Notes at 101% of the principal amount thereof, plus accrued and unpaid interest to the redemption date.

The 2024 Senior Notes are senior unsecured obligations of the Company and are guaranteed by the Company’s existing and future subsidiaries that also guarantee obligations under the Company’s 2020 Credit Agreement. In addition, the indenture for the 2024 Senior Notes provides for customary covenants, including restrictions on the payment of dividends and share repurchases, and includes customary events of default.

Redemption of 2017 Senior Notes

On April 20, 2017, the Company issued $500.0 million in aggregate principal amount of 6.875% Senior Notes due May 1, 2025 (the “2017 Senior Notes”) in a private placement offering.

The proceeds of the 2024 Senior Notes, together with cash on hand, were used to redeem in full, all of the outstanding obligations in respect of the 2017 Senior Notes. The redemption of the 2017 Senior Notes occurred on May 2, 2024 (the “2017 Senior Notes Redemption”).

2020 Credit Agreement

On August 18, 2020, the Company entered into a credit agreement (as amended, the “2020 Credit Agreement”) with BMO Bank N.A. (f/k/a BMO Harris Bank N.A.), as Administrative Agent, Swing Line Lender and L/C Issuer and other lenders. The 2020 Credit Agreement originally provided for a $425.0 million term loan B facility (the “Term Loan B”) and a $175.0 million revolving credit facility (the “Revolver”), which was subsequently reduced to $170.0 million following the effectiveness of the 2024 Amendment (as defined and discussed below), with sub-limits for the issuance of letters of credit and swing line loans up to the aggregate amounts of $75.0 million and $10.0 million, respectively. The Term Loan B was set to mature on August 18, 2027. Prior to the 2017 Senior Notes Redemption, if any of the 2017 Senior Notes had remained outstanding beyond certain dates, the maturities of the Term Loan B and the Revolver would have been subject to acceleration (“spring-forward maturity”). However, following the 2017 Senior Notes Redemption and the consummation of the 2024 Amendment, the spring-forward maturity of the Term Loan B is no longer in effect and the spring-forward maturity of the Revolver has been extended (as described below).

On April 15, 2024, the Company entered into an amendment in respect of the 2020 Credit Agreement (the “2024 Amendment”) which, among other changes, (1) extends the existing Revolver maturity date from August 18, 2025 to (a) if any tranche of the Term Loan B, any incremental term loan or any refinancing term loan (or any refinancing or replacement thereof) remains outstanding, the earlier of (i) May 20, 2027 and (ii) the date that is ninety (90) days prior to the final maturity of any tranche of the Term Loan B, any incremental term loan or any refinancing term loan (or any refinancing or replacement thereof), as applicable, and (b) if no obligations are outstanding with respect to any tranche of the Term Loan B, any incremental term loan or any refinancing term loan, August 18, 2027 and (2) permanently reduces the aggregate commitments in respect of the Revolver by $5.0 million from $175.0 million to $170.0 million. The 2024 Amendment became effective on May 2, 2024 upon the completion of the 2017 Senior Notes Redemption.

The 2020 Credit Agreement permits the Company to repay any or all borrowings outstanding under the 2020 Credit Agreement at any time prior to maturity without penalty. The 2020 Credit Agreement requires the Company to make regularly scheduled payments of principal on the Term Loan B in quarterly installments equal to 0.25% of the initial principal amount of the Term Loan B. The 2020 Credit Agreement also requires the Company to make prepayments on the Term Loan B in connection with certain asset sales, receipts of insurance proceeds, incurrences of certain indebtedness and annual excess cash flow (in each case, subject to certain customary exceptions). During the first quarter of 2025, the Company voluntarily repaid the remaining $121.9 million outstanding balance of the Term Loan B.

Subject to certain exceptions, at any time prior to maturity, the 2020 Credit Agreement provides the Company with the right to increase the commitments under the Revolver and/or to establish one or more term loan facilities in an aggregate amount up to (i) the greater of $173.5 million and 50% LTM EBITDA (as defined in the 2020 Credit Agreement) plus (ii) additional amounts if (A) in the case of pari passu first lien secured indebtedness, the First Lien Net Leverage Ratio (as defined in the 2020 Credit Agreement) does not exceed 1.35:1.00, (B) in the case of junior lien secured indebtedness, the Total Net Leverage Ratio (as defined in the 2020 Credit Agreement) does not exceed 3.50:1.00 and (C) in the case of unsecured indebtedness, (x) the Total Net Leverage Ratio does not exceed 3.50:1.00 or (y) the Fixed Charge Coverage Ratio (as defined in the 2020 Credit Agreement) is no less than 2.00:1.00.

Borrowings under the 2020 Credit Agreement bear interest, at the Company’s option, at a rate equal to (i) (A) in the case of the Term Loan B, following the amendment to the 2020 Credit Agreement on May 2, 2023 (as discussed below), (x) the Adjusted Term Secured Overnight Financing Rate (“Adjusted Term SOFR”) (calculated with a 11.448 basis point,26.161 basis point and 42.826 basis point credit spread adjustment for a 1, 3 and 6 month interest period, respectively) or (y) a base rate (determined by reference to the highest of (1) the administrative agent’s prime lending rate, (2) the federal funds effective rate plus 50 basis points and (3) the Adjusted Term SOFR rate for a one-month interest period plus 100 basis points) and (B) in the case of the Revolver, following the amendment to the 2020 Credit Agreement on October 31, 2022 (as discussed below), (x) the Adjusted Term SOFR rate (calculated with a 10 basis point credit spread adjustment for all interest periods) or (y) a base rate (determined by reference to the highest of (1) the administrative agent’s prime lending rate, (2) the federal funds effective rate plus 50 basis points and (3) the Adjusted Term SOFR rate for a one-month interest period plus 100 basis points) plus, in each case, (ii) an applicable margin. The margin applicable to the Term Loan B is between 4.50% and 4.75% for Adjusted Term SOFR and between 3.50% and 3.75% for base rate, and, in each case, is based on the Total Net Leverage Ratio. The margin applicable to the Revolver is between 4.25% and 4.75% for Adjusted Term SOFR and 3.25% and 3.75% for base rate, and, in each case, is based on the First Lien Net Leverage Ratio. Effective following the amendment to the 2020 Credit Agreement on October 31, 2022, the Company’s original London Interbank Offered Rate (“LIBOR”) option in respect of the Revolver was transitioned to Adjusted Term SOFR. Effective May 2, 2023, the 2020 Credit Agreement was further amended to transition the Company’s original LIBOR option in respect of the Term Loan B to Adjusted Term SOFR. In addition to paying interest on outstanding principal under the 2020 Credit Agreement, the Company will pay a commitment fee to the lenders under the Revolver in respect of the unutilized commitments thereunder. The Company will pay customary letter of credit fees. If a payment or bankruptcy event of default occurs and is continuing, the otherwise applicable margin on overdue amounts will be increased by 2% per annum. The 2020 Credit Agreement includes customary provisions for the replacement of Adjusted Term SOFR with an alternative benchmark rate upon Adjusted Term SOFR being discontinued. The average borrowing rates on the Term Loan B and the Revolver for the nine months ended September 30, 2025 were approxima tely 9.2% and 10.8%, respectively.

As amended, the 2020 Credit Agreement requires, solely with respect to the Revolver, the Company and its restricted subsidiaries to maintain a maximum First Lien Net Leverage Ratio of 3.50:1.00, effective the fiscal quarter ended December 31, 2022 and increasing to 3.75:1.00 for the fiscal quarter ending March 31, 2023 and subsequently stepping down to 3.00:1.00 for the fiscal quarter ending June 30, 2023,2.50:1.00 for the fiscal quarter ending September 30, 2023 and 2.25:1.00 for the fiscal quarter ending December 31, 2023 and each fiscal quarter thereafter. The 2020 Credit Agreement also includes certain customary representations and warranties, affirmative covenants and events of default. Subject to certain exceptions, substantially all of the Company’s existing and future material wholly-owned subsidiaries unconditionally guarantee the obligations of the Company under the 2020 Credit Agreement; additionally, subject to certain exceptions, the obligations are secured by a lien on substantially all of the assets of the Company and its subsidiaries guaranteeing these obligations.

As of September 30, 2025, the entire $170.0 million was available under the Revolver. The Company was in compliance with the financial covenant under the 2020 Credit Agreement for the period ended September 30, 2025.

Interest Expense

Interest expense as reported in the Condensed Consolidated Statements of Operations consisted of the following:

(a)The combination of cash and non-cash interest expense produces effective interest rates that are higher than contractual rates. Accordingly, the effective interest rate for the 2024 Senior Notes was 13.56% for the nine months ended September 30, 2025.

(11)Leases

The Company leases certain office space, construction and office equipment, vehicles and temporary housing generally under non-cancelable operating leases. Leases with an initial term of one year or less are not recorded on the balance sheet, and the Company generally recognizes lease expense for these leases on a straight-line basis over the lease term. As of September 30, 2025, the Company’s operating leases have remaining lease terms ranging from less thanone year to 13 years, some of which include options to renew the leases. The exercise of lease renewal options is generally at the Company’s sole discretion. The Company’s leases do not contain any material residual value guarantees or material restrictive covenants.

The following table presents components of lease expense for the three and nine months ended September 30, 2025 and 2024:

(a)Short-term lease expense includes all leases with lease terms of up toone year. Short-term leases include, among other things, construction equipment rented on an as-needed basis as well as temporary housing.

The following table presents supplemental balance sheet information related to operating leases:

The following table presents supplemental cash flow information and non-cash activity related to operating leases:

The following table presents maturities of operating lease liabilities on an undiscounted basis as of September 30, 2025:

(12)Commitments and Contingencies

The Company and certain of its subsidiaries are involved in litigation and other legal proceedings and forms of dispute resolution in the ordinary course of business, including but not limited to disputes over contract payment and/or performance-related issues (such as disagreements regarding delay or a change in the scope of work of a project and/or the price associated with that change) and other matters incidental to the Company’s business. In accordance with ASC 606, the Company makes assessments of these types of matters on a routine basis and, to the extent permitted by ASC 606, estimates and records recovery related to these matters as a form of variable consideration at the most likely amount the Company expects to receive, as discussed further in Note 4, Contract Assets and Liabilities. In addition, the Company is contingently liable for litigation, performance guarantees and other commitments arising in the ordinary course of business, which are accounted for in accordance with ASC 450, Contingencies. Management reviews these matters regularly and updates or revises its estimates as warranted by subsequent information and developments. These assessments require judgments concerning matters that are inherently uncertain, such as litigation developments and outcomes, the anticipated outcome of negotiations and the estimated cost of resolving disputes. Consequently, these assessments are estimates, and actual amounts may vary from such estimates. In addition, because such matters are typically resolved over long periods of time, the Company’s assets and liabilities may change over time should the circumstances dictate. The description of the legal proceedings listed below include management’s assessment of those proceedings. Management believes that, based on current information and discussions with the Company’s legal counsel, the ultimate resolution of other matters is not expected to have a material effect on the Company’s consolidated financial position, results of operations or cash flows.

A description of the material pending legal proceedings, other than ordinary routine litigation incidental to the business, is as follows:

Alaskan Way Viaduct Matter

In January 2011, Seattle Tunnel Partners (“STP”), a joint venture between Dragados USA, Inc. and the Company, entered into a design-build contract with the Washington State Department of Transportation (“WSDOT”) for the construction of a large-diameter bored tunnel in downtown Seattle, King County, Washington to replace the Alaskan Way Viaduct, also known as State Route 99. The Company has a 45% interest in STP. The construction of the large-diameter bored tunnel required the use of a tunnel boring machine (“TBM”). In December 2013, the TBM struck a steel pipe, installed by WSDOT as a well casing for an exploratory well. The TBM was significantly damaged and was required to be repaired. STP asserted that the steel pipe casing was a differing site condition that WSDOT failed to properly disclose. The Disputes Review Board mandated by the contract to hear disputes issued a decision finding the steel casing was a Type I (material) differing site condition. WSDOT did not accept that finding.

Case Against WSDOT

In March 2016, WSDOT filed a complaint against STP in Thurston County Superior Court alleging breach of contract, seeking $57.2 million in delay-related damages and seeking declaratory relief. STP subsequently filed a counterclaim against WSDOT seeking damages in excess of $640 million. The jury trial between STP and WSDOT commenced on October 7, 2019 and concluded on December 13, 2019, with a jury verdict in favor of WSDOT awarding them $57.2 million in damages. The

Company recorded the impact of the jury verdict during the fourth quarter of 2019, resulting in a pre-tax charge of $166.8 million, which included $25.7 million for the Company’s 45% proportionate share of the $57.2 million in damages awarded by the jury to WSDOT. The charge was for non-cash write-downs primarily related to the costs and estimated earnings in excess of billings and receivables that the Company previously recorded to reflect its expected recovery in this case. STP’s petition for discretionary review by the Washington Supreme Court was denied on October 10, 2022. On October 18, 2022, STP paid the damages and associated interest from the judgment, which included the Company’s proportionate share of $34.6 million. As a result, the lawsuit between STP and WSDOT has concluded.

Case Against Insurers

The TBM was insured under a Builder’s Risk Insurance Policy (the “Policy”) with Great Lakes Reinsurance (UK) PLC and a consortium of other insurers (the “Insurers”). STP submitted the claims to the Insurers and requested interim payments under the Policy. The Insurers refused to pay and denied coverage. In June 2015, STP filed a lawsuit in the King County Superior Court, State of Washington seeking declaratory relief, as well as damages as a result of the Insurers’ breach of their obligations under the terms of the Policy. On September 30, 2024, after several years of law and motion proceedings, a confidential settlement was reached resolving the case in full for a substantial sum. Payment was received in October 2024 and the case against the Insurers was dismissed. As a result of the settlement, STP resolved the claims of Hitachi Zosen (the manufacturer of the TBM) and the remaining subcontractor lawsuits pending on the project, including those with the Company’s subsidiaries.

Case Against Designer

On April 13, 2023, STP filed a case in the Washington Superior Court against HNTB Corporation (“HNTB”), STP’s design firm on the project, wherein STP alleges that HNTB is liable for providing design services that resulted in the TBM striking the steel pipe described above and for additional steel quantity costs associated with the project. Due to the resolution of the matter against the Insurers and WSDOT discussed above, and subject to any setoffs or contractual damages limitations, STP’s current claim against HNTB exceeds $300 million and includes HNTB’s liability for providing design services, amounts paid by STP to WSDOT in liquidated damages and interest as well as certain subcontractor delay claims paid by STP to subcontractors in November 2024. The case is currently scheduled for trial to commence in April 2026. With respect to STP’s claims against HNTB, management has included in receivables an estimate of the total anticipated recovery concluded to be probable. The case against HNTB is the final case related to the project.

(13)Share-Based Compensation

As of September 30, 2025, there were 3,639,951 shares of common stock available for grant under the Tutor Perini Corporation Omnibus Incentive Plan. During the nine months ended September 30, 2025 and 2024, the Company granted the following shares of common stock and share-based instruments: (1) service-based RSUs totaling 444,405 and 30,000, respectively, with weighted-average grant date fair values per unit of $36.45 and $12.68, respectively; (2) cash-settled restricted stock units (“CRSUs”) with service-based vesting conditions and payouts indexed to shares of the Company’s common stock totaling 381,410 and 673,855, respectively, with weighted-average grant date fair values per unit of $27.59 and $12.75, respectively; and(3) sharesof unrestricted common stock issued to its directors as part of their annual retainer totaling 40,710 and 73,716, respectively, with weighted-average grant date fair values per unit of $36.35 and$20.89, respectively. During the nine months ended September 30, 2025, the Company granted 151,623 performance-based RSUs with a weighted-average grant date fair value per unit of $47.76. During the nine months ended September 30, 2024, the Company also granted 645,180 cash-settled performance stock units (“CPSUs”)with a weighted-average grant date fair value per unit of $19.17. The number of performance-based RSUs and CPSUs granted are shown at target-level performance.

As of September 30, 2025 and December 31, 2024, the Company recognized liabilities for CPSUs and CRSUs on the Condensed Consolidated Balance Sheets totaling approximately$137.6 million and $34.6 million, respectively. During the nine months ended September 30, 2025 and 2024, the Company paid approximately$11.6 million and $2.9 million, respectively, to settle certain awards.

For the three and nine months ended September 30, 2025, the Company recognized, as part of general and administrative expenses, costs for share-based payment arrangements totaling $58.7 million and $120.7 million, respectively, and $16.5 million and $39.0 million for the three and nine months ended September 30, 2024, respectively. As of September 30, 2025, the balance of unamortized share-based compensation expense was $95.5 million, which is expected to be recognized over a weighted-average period of 1.5 years.

(14)Employee Pension Plans

The Company has a defined benefit pension plan and an unfunded supplemental retirement plan. Effective June 1, 2004, all benefit accruals under these plans were frozen; however, the current vested benefit was preserved. The pension disclosure presented below includes aggregated amounts for both of the Company’s plans.

The following table sets forth a summary of the net periodic benefit cost for the three and nine months ended September 30, 2025 and 2024:

The Company contributed $1.8 million to its defined benefit pension plan during both the nine months ended September 30, 2025 and 2024, and expects to contribute an additional $0.6 million in cash by the end of 2025.

(15)Fair Value Measurements

The fair value hierarchy established by ASC 820, Fair Value Measurement, prioritizes the use of inputs used in valuation techniques into the following three levels:

•Level 1 inputs are observable quoted prices in active markets for identical assets or liabilities

•Level 2 inputs are observable, either directly or indirectly, but are not Level 1 inputs

•Level 3 inputs are unobservable

The following fair value hierarchy table presents the Company’s assets that are measured at fair value on a recurring basis as of September 30, 2025 and December 31, 2024:

(a)Includes money market funds and short-term investments with maturity dates ofthree months or less when acquired.

(b)Restricted investments, as of September 30, 2025 and December 31, 2024, consist of available-for-sale (“AFS”) debt securities, which are valued based on pricing models determined from a compilation of primarily observable market information, broker quotes in non-active markets or similar assets; therefore, they are classified as Level 2 assets.

(c)Investments in lieu of retention are included in retention receivable as of September 30, 2025 and December 31, 2024, and are composed of money market funds of $35.2 million and $38.4 million, respectively, and AFS debt securities of $140.3 million and $106.8 million, respectively. The fair values of the money market funds are measured using quoted market prices; therefore, they are classified as Level 1 assets. The fair values of AFS debt securities are determined from a compilation of primarily observable market information, broker quotes in non-active markets or similar assets; therefore, they are classified as Level 2 assets.

Investments in AFS debt securities consisted of the following as of September 30, 2025 and December 31, 2024:

The following table summarizes the fair value and gross unrealized losses aggregated by category and the length of time that individual AFS debt securities have been in a continuous unrealized loss position as of September 30, 2025 and December 31, 2024:

The unrealized losses in AFS debt securities as of September 30, 2025 and December 31, 2024 are primarily attributable to market interest rate increases and not a deterioration in credit quality of the issuers. Management evaluated the unrealized losses in AFS debt securities considering factors including credit ratings and other relevant information, which may indicate that contractual cash flows are not expected to occur. Based on the analysis, management determined that credit losses did not exist for AFS debt securities in an unrealized loss position as of September 30, 2025 and December 31, 2024.

It is not considered likely that the Company will be required to sell the investments before full recovery of the amortized cost basis of the AFS debt securities, which may be at maturity. As a result, consistent with the same period in 2024, the Company has not recognized any impairment losses in earnings during the nine months ended September 30, 2025.

The amortized cost and fair value of AFS debt securities by contractual maturity as of September 30, 2025 are summarized in the table below. Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay certain obligations.

The carrying values of receivables, payables and other amounts arising out of normal contract activities, including retention, which may be settled beyond one year, are estimated to approximate fair value. Of the Company’s long-term debt, the fair value of the 2024 Senior Notes was $448.5 million and $441.9 million as of September 30, 2025 and December 31, 2024, respectively. The fair values of the 2024 Senior Notes were determined using Level 1 inputs, specifically current observable market prices. The fair value of the Term Loan B was $121.9 million as of December 31, 2024. The fair value of the Term Loan B was determined using Level 2 inputs, specifically third-party quoted market prices. The reported value of the Company’s remaining borrowings approximates fair value as of September 30, 2025 and December 31, 2024.

(16)Variable Interest Entities (VIEs)

The Company may form joint ventures or partnerships with third parties for the execution of projects. In accordance with ASC 810, Consolidation (“ASC 810”), the Company assesses its partnerships and joint ventures at inception to determine if any meet the qualifications of a VIE. The Company considers a joint venture a VIE if either (a) the total equity investment is not sufficient to permit the entity to finance its activities without additional subordinated financial support, (b) characteristics of a controlling financial interest are missing (either the ability to make decisions through voting or other rights, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the entity), or (c) the voting rights of the equity holders are not proportional to their obligations to absorb the expected losses of the entity and/or their rights to receive the expected residual returns of the entity, and substantially all of the entity’s activities either involve or are conducted on behalf of an investor that has disproportionately few voting rights. Upon the occurrence of certain events outlined in ASC 810, the Company reassesses its initial determination of whether a joint venture is a VIE.

ASC 810 also requires the Company to determine whether it is the primary beneficiary of the VIE. The Company concludes that it is the primary beneficiary and consolidates the VIE if the Company has both (a) the power to direct the economically significant activities of the VIE and (b) the obligation to absorb losses of, or the right to receive benefits from, the VIE that could potentially be significant to the VIE. The Company considers the contractual agreements that define the ownership structure, distribution of profits and losses, risks, responsibilities, indebtedness, voting rights and board representation of the respective parties in determining if the Company is the primary beneficiary. The Company also considers all parties that have direct or implicit variable interests when determining whether it is the primary beneficiary. In accordance with ASC 810, management’s assessment of whether the Company is the primary beneficiary of a VIE is performed continuously.

As of September 30, 2025, the Company had unconsolidated VIE-related current assets and noncurrent assets of $51.3 million and $6.2 million, respectively, as well as current liabilities of $58.3 million included in the Company’s Condensed Consolidated Balance Sheets. As of December 31, 2024, the Company had unconsolidated VIE-related current assets and liabilities of $26.7 million and $24.8 million, respectively, included in the Company’s Condensed Consolidated Balance Sheets. The Company’s maximum exposure to loss as a result of its investments in unconsolidated VIEs is typically limited to the aggregate of the carrying value of the investment and future funding commitments. There wereno future funding requirements for the unconsolidated VIEs as of September 30, 2025.

As of September 30, 2025, the Company’s Condensed Consolidated Balance Sheets included current and noncurrent assets of $1.0 billion and $32.4 million, respectively, as well as current and noncurrent liabilities of $738.5 million and $6.5 million, respectively, related to the operations of its consolidated VIEs. As of December 31, 2024, the Company’s Condensed Consolidated Balance Sheets included current and noncurrent assets of $475.6 million and $19.9 million, respectively, as well as current liabilities of $385.5 million related to the operations of its consolidated VIEs.

Below is a discussion of some of the Company’s more significant or unique VIEs.

The Company established a joint venture to construct the Purple Line Extension Section 2 (Tunnels and Stations) and Section 3 (Stations) mass-transit projects in Los Angeles, California with an original combined value of approximately $2.8 billion. The Company has a 75% interest in the joint venture with the remaining 25% held by O&G Industries, Inc. The joint venture was initially financed with contributions from the partners and, per the terms of the joint venture agreement, the partners may be required to provide additional capital contributions in the future. The Company has determined that this joint venture is a VIE for which the Company is the primary beneficiary.

The Company established a joint venture with O&G to construct the Manhattan Jail project, a $3.76 billion design-build construction project in New York. The Company has a 75% interest in the joint venture with the remaining 25% held by O&G. The joint venture was initially financed with contributions from the partners and, per the terms of the joint venture agreement, the partners may be required to provide additional capital contributions in the future. The Company has determined that this joint venture is a VIE for which the Company is the primary beneficiary.

(17)Changes in Equity

A reconciliation of the changes in equity for the three and nine months ended September 30, 2025 and 2024 is provided below:

(18)Other Comprehensive Income (Loss)

ASC 220, Comprehensive Income, establishes standards for reporting comprehensive income and its components in the consolidated financial statements. The Company reports the change in pension benefit plan assets/liabilities, cumulative foreign currency translation and the unrealized gain (loss) of investments as components of accumulated other comprehensive income (loss) (“AOCI”).

The components of other comprehensive income (loss) and the related tax effects for the three and nine months ended September 30, 2025 and 2024 were as follows:

The changes in AOCI balances by component (after tax) attributable to Tutor Perini Corporation and attributable to noncontrolling interests during the three and nine months ended September 30, 2025 and 2024 were as follows:

The significant items reclassified out of AOCI and the corresponding location and impact on the Condensed Consolidated Statements of Operations during the three and nine months ended September 30, 2025 and 2024 were as follows:

(a)Amounts included in other income, net on the Condensed Consolidated Statements of Operations.

(b)Amounts included in income tax (expense) benefit on the Condensed Consolidated Statements of Operations.

(19)Business Segments

The Company offers general contracting, pre-construction planning and comprehensive project management services, including planning and scheduling of manpower, equipment, materials and subcontractors required for the timely completion of a project in accordance with the terms and specifications contained in a construction contract. The Company also offers self-performed construction services: site work, concrete forming and placement, steel erection, electrical, mechanical, plumbing, and HVAC (heating, ventilation and air conditioning). As described below, the Company’s business is conducted through three segments: Civil, Building and Specialty Contractors. These segments are determined based on how management aggregates its business units for making operating decisions and assessing performance, which takes into account certain qualitative and quantitative factors. The Company’s Chief Executive Officer and President, who is the Company’s chief operating decision maker (“CODM”), reviews information for each segment to evaluate performance and allocate resources. The CODM evaluates segment performance by comparing each segment’s historical, actual and forecasted revenue and operating income on a regular basis.

The Civil segment specializes in public works construction and the replacement and reconstruction of infrastructure. The contracting services provided by the Civil segment include construction and rehabilitation of highways, bridges, tunnels, mass-transit systems, military facilities, and water management and wastewater treatment facilities.

The Building segment has significant experience providing services for private and public works customers in a number of specialized building markets, including: hospitality and gaming, transportation, healthcare, commercial offices, government facilities, sports and entertainment, education, correctional and detention facilities, biotech, pharmaceutical, industrial and technology.

The Specialty Contractors segment specializes in electrical, mechanical, plumbing, HVAC and fire protection systems for a full range of civil and building construction projects in the industrial, commercial, hospitality and gaming, and mass-transit end markets. This segment is strategically important to the Company because various business units within the segment participate in many of the Company’s larger Civil and Building segment projects, and the segment provides unique strengths and capabilities that allow the Company to position itself as a full-service contractor in key geographic markets with greater control over scheduled work, project delivery, and cost and risk management.

To the extent that a contract is co-managed and co-executed among segments, the Company allocates the share of revenues and costs of the contract to each segment to reflect the shared responsibilities in the management and execution of the project.

The following tables set forth certain reportable segment information relating to the Company’s operations for the three and nine months ended September 30, 2025 and 2024:

(a)General and administrative expenses for the three months ended September 30, 2025 and 2024 included share-based compensation expense of $58.7 million ($58.3 million after tax, or $1.08 per diluted share) and $16.5 million ($16.4 million after tax, or $0.31 per diluted share), respectively. The increase in share-based compensation expense in the third quarter of 2025 was primarily due to a substantial increase in the Company’s stock price during the period, which impacted the fair value of liability-classified awards. These awards are remeasured at fair value at the end of each reporting period with the change recognized in earnings.

(b)Depreciation and amortization is included in income (loss) from construction operations.

(c)During the three months ended September 30, 2024, the Company’s loss from construction operations was impacted by unfavorable adjustments of $101.6 million ($74.5 million after tax, or $1.42 per diluted share) related to an unexpected adverse arbitration decision on a legacy dispute related to a completed Civil segment bridge project in California, which the Company is appealing; $20.0 million ($14.7 million after tax, or $0.28 per diluted share) related to a settlement on a legacy dispute related to a completed Building segment government facility project in Florida; and $17.7 million ($13.0 million after tax, or $0.25 per diluted share) due to an unfavorable judgment on a completed Specialty Contractors segment mass-transit project in California. The period was also impacted by a favorable adjustment of $18.4 million ($13.5 million after tax, or $0.26 per diluted share) due to a settlement of a claim associated with a completed Civil segment highway tunneling project in the Western United States.

(a)General and administrative expenses for the nine months ended September 30, 2025 and 2024 included share-based compensation expense of $120.7 million ($119.8 million after tax, or $2.25 per diluted share) and $39.0 million ($38.5 million after tax, or $0.73 per diluted share), respectively. The increase in share-based compensation expense in the current-year period was primarily due to a substantial increase in the Company’s stock price during the period, which impacted the fair value of liability-classified awards. These awards are remeasured at fair value at the end of each reporting period with the change recognized in earnings.

(b)During the nine months ended September 30, 2025, the Company’s income (loss) from construction operations was impacted by favorable adjustments in the second quarter totaling $28.0 million ($20.3 million after tax, or $0.38 per diluted share) due to the settlement of certain change orders and changes in estimates due to improved performance on a Civil segment mass-transit project in the Midwest.

(c)Depreciation and amortization is included in income (loss) from construction operations.

(d)During the nine months ended September 30, 2024, the Company’s income (loss) from construction operations was impacted by unfavorable adjustments of $101.6 million ($74.5 million after tax, or $1.43 per diluted share) in the third quarter related to an unexpected adverse arbitration decision on a legacy dispute related to a completed Civil segment bridge project in California, which the Company is appealing; $20.0 million ($14.7 million after tax, or $0.28 per diluted share) in the third quarter related to a settlement on a legacy dispute related to a completed Building segment government facility project in Florida; and $17.7 million ($13.0 million after tax, or $0.25 per diluted share) in the third quarter due to an unfavorable judgment on a completed Specialty Contractors segment mass-transit project in California. The period was also impacted by a favorable adjustment of $18.4 million ($13.5 million after tax, or $0.26 per diluted share) in the third quarter due to a settlement of a claim associated with a completed Civil segment highway tunneling project in the Western United States.

Total assets by segment were as follows:

(a)Consists principally of cash, equipment, tax-related assets and insurance-related assets, offset by the elimination of assets related to intersegment revenue.

Geographic Information

Information concerning principal geographic areas is as follows:

Major Customers

Revenue from a single customer with multiple projects, impacting the Civil, Building and Specialty Contractors segments, represented 14.4% and 15.1% of the Company’s consolidated revenue for the three and nine months ended September 30, 2025, respectively, and 16.9% and 18.2%of the Company’s consolidated revenue for the three and nine months ended September 30, 2024, respectively. Revenue from an additional customer with multiple projects, impacting the Civil, Building and Specialty Contractors segments, represented 10.1% and 10.0% of the Company’s consolidated revenue for the three and nine months ended September 30, 2025, respectively.

Reconciliation of Segment Information to Consolidated Amounts

A reconciliation of segment results to the consolidated income (loss) before income taxes is as follows: