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    SEC Form 11-K filed by Quest Diagnostics Incorporated

    6/18/26 4:12:03 PM ET
    $DGX
    Medical Specialities
    Health Care
    Get the next $DGX alert in real time by email
    dgx-20260618
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    UNITED STATES
    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549

    Form 11-K




    (Mark One)
    x    ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

    For the fiscal year ended December 31, 2025

    OR

    o    TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

    For the transition period from _______to _______


    Commission file number: 001-12215

    A. Full title of the plan and the address of the plan, if different from that of the issuer named below:
        

    THE QUEST DIAGNOSTICS PROFIT SHARING PLAN


    B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

    QUEST DIAGNOSTICS INCORPORATED
    500 PLAZA DRIVE
    SECAUCUS, NJ 07094




    The Quest Diagnostics Profit Sharing Plan
    Index to Financial Statements and Supplemental Schedule


    Page
    Financial Statements
    Report of Independent Registered Public Accounting Firm
    1
    Statements of Net Assets Available for Benefits as of December 31, 2025 and 2024
    2
    Statement of Changes in Net Assets Available for Benefits for the Year Ended December 31, 2025
    3
    Notes to Financial Statements
    4
    Supplemental Schedule*
    Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year) as of December 31, 2025
    9
    Signature
    14
    * Other schedules required by Section 2520.103-10 of the Department of Labor's Rules and Regulations for Reporting and Disclosure under ERISA have been omitted because they are not applicable.
    Exhibit
    Exhibit 23 - Consent of Independent Registered Public Accounting Firm





    Report of Independent Registered Public Accounting Firm

    Plan Administrator and Plan Participants
    The Quest Diagnostics Profit Sharing Plan    

    Opinion on the financial statements
    We have audited the accompanying statements of net assets available for benefits of The Quest Diagnostics Profit Sharing Plan (the “Plan”) as of December 31, 2025 and 2024, the related statement of changes in net assets available for benefits for the year ended December 31, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2025 and 2024, and the changes in net assets available for benefits for the year ended December 31, 2025 in conformity with accounting principles generally accepted in the United States of America.

    Basis for opinion
    These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on the Plan’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

    We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion.

    Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

    Supplemental information
    The schedule of assets (held at end of year) as of December 31, 2025 (“supplemental information”) has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. The supplemental information is the responsibility of the Plan’s management. Our audit procedures included determining whether the supplemental information reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental information. In forming our opinion on the supplemental information, we evaluated whether the supplemental information, including its form and content, is presented in conformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental information is fairly stated, in all material respects, in relation to the financial statements as a whole.

    /s/ GRANT THORNTON LLP

    We have served as the Plan's auditor since 2008.

    Melville, New York
    June 18, 2026



    1



    The Quest Diagnostics Profit Sharing Plan
    Statements of Net Assets Available for Benefits
    December 31, 2025 and 2024
    (in thousands)


    20252024
    Assets
    Cash
    $4 $— 
    Investments, at fair value
    6,158,117 5,483,306 
    Receivables
    Notes receivable from participants 70,137 70,809 
    Investment related receivables735 1,031 
    Total receivables70,872 71,840 
    Total assets6,228,993 5,555,146 
    Liabilities
    Investment related payables405 1,376 
    Net assets available for benefits
    $6,228,588 $5,553,770 

































    The accompanying notes are an integral part of these financial statements.
    2


    The Quest Diagnostics Profit Sharing Plan
    Statement of Changes in Net Assets Available for Benefits
    For the Year Ended December 31, 2025
    (in thousands)


    Additions:
    Investment income
    Net appreciation in fair value of investments$918,980 
    Dividends and interest18,693 
    Total investment income937,673 
    Interest income on notes receivable from participants5,657 
    Contributions
    Employer106,159 
    Participants204,797 
    Rollovers31,009 
    Total contributions341,965 
    Total additions1,285,295 
    Deductions:
    Benefits paid to participants608,446 
    Administrative expenses2,031 
    Total deductions610,477 
    Net increase674,818 
    Net assets available for benefits:
    Beginning of year5,553,770 
    End of year$6,228,588 
















    The accompanying notes are an integral part of these financial statements.
    3


    The Quest Diagnostics Profit Sharing Plan
    December 31, 2025 and 2024
    Notes to Financial Statements (dollars in thousands)



    1.    Description of the Plan

        Background - The Quest Diagnostics Profit Sharing Plan (the “Plan”) is a defined contribution plan. The Plan was established by Quest Diagnostics Incorporated ("Quest Diagnostics" or the "Company"), which is the parent entity of a controlled group of corporations and other entities (the "Quest Control Group"). Effective August 15, 2021, sponsorship of the Plan was transferred from the Company to Quest Diagnostics Clinical Laboratories, Inc. (the "Plan Sponsor"), a wholly owned subsidiary of the Company. The Plan provides retirement benefits to eligible employees of the Quest Control Group. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”). The following description of the Plan provides only general information. Participants should refer to the plan document for a more complete description of the Plan's provisions.

        Eligibility and Participant Contributions - The Plan provides for participant-directed investment of their voluntary contributions and employer matching contributions in a number of investment funds. Eligible employees can participate in the Plan as soon as administratively feasible upon becoming an employee of a member of the Quest Control Group. Participants may contribute an amount between 1% and 35% of their eligible compensation, as defined, for the contribution period. Catch-up contributions, as defined in the Internal Revenue Code (the "Code"), are permissible for eligible participants. Participants may modify their contribution percentage at any time. Participants may also choose to make rollover contributions to the Plan of amounts received from an eligible defined benefit or defined contribution plan maintained by another company. Contributions are subject to Code limitations.

        Employer Matching Contributions - Members of the Quest Control Group match 100% of a participant's contribution, up to 5% of eligible compensation, in cash after the participant completes 12 months of service, as defined, with the Quest Control Group. Employer matching contributions are remitted to the Plan at the same time that the corresponding participants' contributions are remitted.

        Participant Accounts - A separate individual account is established for each Plan participant. Each participant's account is credited with the participant's contributions and the employer matching contributions, plus the allocation of investment earnings, gains and losses and expenses, based on participant earnings or account balances, as defined. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account.
        
        Vesting - Participants immediately vest in their voluntary contributions and employer matching contributions plus actual earnings thereon. Certain participants who were active in plans sponsored by previous employers have vesting requirements applied to their previous employer contribution accounts consistent with the vesting requirements in effect before the assets were merged into the Plan.

        Investment Options - Participants may elect to have their voluntary contributions and employer matching contributions invested in any or all of the available investment options, most of which are managed by Fidelity Management & Research Company (“FMRC”) and its affiliates. Participants may also elect to have their voluntary contributions and employer matching contributions invested in shares of the Company's common stock through the Quest Diagnostics stock fund. Participants have the ability to modify their investment elections daily, subject to certain short-term trading restrictions imposed by FMRC and its affiliates and the Company's securities trading policy, which prohibits trading in the Company's common stock on a short-term basis and while in possession of material non-public information about the Company.

        Participants cannot contribute greater than 25% per pay period of pre-tax contributions into the Quest Diagnostics stock fund. In addition, participants can transfer monies into the Quest Diagnostics stock fund only to the extent the percentage of holdings in the Quest Diagnostics stock fund after the transfer remains below 25% of the participant's entire account balance.

        Participants may elect to receive their dividends on investments in the Quest Diagnostics stock fund as a taxable cash payment or to have those dividends automatically reinvested.

        Distribution Options - Participants can elect to have their benefit distributions, equal to the value of the vested portion of their account balance, paid in the form of a partial or lump sum distribution, a direct rollover into another eligible retirement plan or traditional individual retirement account, installment payments, or for certain assets, an annuity.

    4


    The Quest Diagnostics Profit Sharing Plan
    December 31, 2025 and 2024
    Notes to Financial Statements (dollars in thousands) - continued



        Withdrawals - Withdrawals may be made for qualified emergencies, as defined in the Code. Depending upon the type of withdrawal and the status of the contribution, penalties upon withdrawal may apply. Participants may also begin to make withdrawals without penalty at age 59 ½, subject to certain limitations as defined by the Plan.

        Forfeitures - Employer contributions in forfeited nonvested accounts may be used to reduce future employer contributions or pay the Plan's expenses. The forfeiture activity and account balance was not material as of and for the years ended December 31, 2025 and 2024.
            
        Parties-in-Interest - Certain investments of the Plan, as of December 31, 2025 and 2024, are shares of mutual funds and collective funds managed by FMRC and its affiliates. These transactions qualify as party-in-interest transactions.

        The Company also is a party-in-interest to the Plan under the definition provided in Section 3(14) of ERISA. Therefore, Quest Diagnostics stock transactions qualify as party-in-interest transactions. As of December 31, 2025 and 2024, the total fair value of the Plan's investment in Quest Diagnostics stock was $310,165 and $295,103, respectively. During 2025, there were no purchases of Quest Diagnostics stock by the Plan and sales of Quest Diagnostics stock by the Plan were $29,226.
        
        Notes Receivable from Participants - Participants are permitted to obtain loans in amounts not less than one thousand dollars and up to the lesser of (1) fifty thousand dollars, subject to certain limitations as defined by the Plan, or (2) 50% of the participant's vested portion of their account value. Except with respect to pre-existing loans transferred or merged into the Plan and as set forth below, a participant may have only one outstanding loan at a time and loans are repayable over a period of up to five years, unless the proceeds are used to purchase a primary residence, in which case a period of up to thirty years (effective January 2025) is permitted. Loans are secured by one-half of a participant's vested account balance and bear interest at prime plus 1%. Rates range from 3.25% to 10.50%; maturities vary by participant. Principal and interest are repaid to the Plan through payroll deductions for active employees. Participants can elect to pay the entire outstanding balance of a loan directly to Fidelity Management Trust Company ("FMTC"). Actively employed participants can also submit a partial loan repayment directly to FMTC outside the normal payroll deductions, accelerating the payoff date. Participants who are no longer active employees may continue to repay outstanding loan balances directly to FMTC.

        In addition, notes receivable from participants qualify as party-in-interest transactions. As of December 31, 2025 and 2024, the carrying value of the Plan's notes receivable from participants was $70,137 and $70,809, respectively.

        Plan Administration - The plan administrator is the Benefits Administration Committee (the "Plan Administrator"), which is appointed by the Plan Sponsor's Board of Directors. The Plan's trustee and recordkeeper for the Plan investments are FMTC and Fidelity Investments Institutional Operations Company LLC, respectively.

        Tax Status - The Internal Revenue Service (“IRS”) has determined and informed the Company by letter dated September 22, 2014, that the Plan and related trust are designed in accordance with applicable sections of the Code. The Plan Sponsor believes that the Plan, which has been amended since the IRS determination, continues to be designed and operated in compliance with the applicable requirements of the Code and, therefore, believes that the Plan is qualified and related trust is tax-exempt.

        Accounting principles generally accepted in the United States (“US GAAP”) requires the Plan Administrator to evaluate tax positions taken by the Plan and recognize a tax liability if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. The Plan Administrator has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2025 and 2024 there are no uncertain positions taken or expected to be taken that would require recognition of a liability or disclosure in the financial statements. The Plan is subject to routine audits by taxing authorities; however, there are currently no audits for any tax periods in progress.

        Administrative Expenses - Plan administrative expenses are paid by the Company to the extent not paid or offset by the Plan or the Quest Control Group. Fees associated with the administration of notes receivable from participants are charged directly against participant accounts. These fees are included in administrative expenses and are expensed when incurred. Investment related expenses are included in net appreciation of fair value of investments.

    5


    The Quest Diagnostics Profit Sharing Plan
    December 31, 2025 and 2024
    Notes to Financial Statements (dollars in thousands) - continued



        Investment Management Fees - Investment management fees and operating expenses charged to the Plan for investments in the Plan are deducted from income earned on a daily basis and are not separately reflected. Consequently, investment management fees and operating expenses are reflected as a reduction of investment return for such investments.

        Plan Termination - The Plan Sponsor intends to continue the Plan indefinitely, but reserves the right to change or discontinue the Plan at its discretion. Participants will become fully vested in their rights under the Plan if it is terminated or if employer matching contributions are completely discontinued.
        
    2.    Summary of Significant Accounting Policies

        Basis of Presentation - The Plan maintains its financial records on the accrual basis of accounting.
        
        Use of Estimates - The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities, if any, at the date of the financial statements and the reported amounts of additions to and deductions from net assets during the reporting period. Actual results could differ from those estimates.

        Risks and Uncertainties - Certain underlying investment securities are exposed to various risks, such as interest rate, market and credit risk. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, changes in these risks could materially affect participants' account balances and the amounts reported in the Statements of Net Assets Available for Benefits and the Statement of Changes in Net Assets Available for Benefits.

        Benefits paid to participants - Benefits payments to participants are recorded when paid.

        Valuation of Investments - Investments are stated at fair value at year end. Refer to Note 3 for additional information related to the valuation of Plan investments.

        Security Transactions and Income - Purchases and sales of securities are recorded on a trade-date basis. Dividend income is recorded on the ex-dividend date. Interest income from investments is recorded as earned on an accrual basis.

        Net appreciation in fair value of investments represents the Plan's net realized and unrealized gains (losses) on investments held by the Plan.    

        Notes Receivable from Participants - Notes receivable from participants are valued at their unpaid principal balance, plus any accrued but unpaid interest. Interest income from notes receivable from participants is recorded on an accrual basis.     

        
    3.    Fair Value Measurements

        Fair value measurements are based upon the exit price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants, and are determined by either the principal market or the most advantageous market.

        Inputs used in the valuation techniques to derive fair values are classified based on a three-level hierarchy to prioritize the inputs used in the valuation techniques to derive fair values. The basis for fair value measurements for each level within the hierarchy is described below with Level 1 having the highest priority and Level 3 having the lowest.
    6


    The Quest Diagnostics Profit Sharing Plan
    December 31, 2025 and 2024
    Notes to Financial Statements (dollars in thousands) - continued



    Level 1:Quoted prices in active markets for identical assets or liabilities.
    Level 2:
    Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets.
    Level 3:Valuations derived from valuation techniques in which one or more significant inputs are unobservable.
        
        During the year ended December 31, 2025, there were no transfers between levels.

        The following table provides a summary of the assets in the Plan that are measured at fair value on a recurring basis:
    Basis of Fair Value Measurements
    December 31, 2025TotalLevel 1Level 2Level 3
    Mutual funds$212,232 $212,232 $— $— 
    Quest Diagnostics common stock310,165 310,165 — — 
    Other common stock287,320 287,320 — — 
    Subtotal$809,717 $809,717 $— $— 
    Investments measured at NAV as a practical expedient: (A)5,348,400 
    Total investments, at fair value$6,158,117 


    Basis of Fair Value Measurements
    December 31, 2024TotalLevel 1Level 2Level 3
    Mutual funds$204,410 $204,410 $— $— 
    Quest Diagnostics common stock295,103 295,103 — — 
    Other common stock282,820 282,743 — 77 
    Subtotal$782,333 $782,256 $— $77 
    Investments measured at NAV as a practical expedient: (A)4,700,973 
    Total investments, at fair value$5,483,306 

        
    (A)    Certain investments, including the Collective Funds, that were measured at fair value using the net asset value ("NAV") per share (or its equivalent) practical expedient were not classified in the fair value hierarchy. There are no unfunded commitments or redemption restrictions related to these investments.

        Following is a description of the valuation methodologies used for assets measured at fair value. There have been no changes in the methodologies used as of December 31, 2025 and 2024.

        Mutual Funds: Valued at the daily closing price reported by the fund. Mutual funds held by the Plan are open-ended mutual funds that are registered with the Security and Exchange Commission ("SEC") and are required to publish their NAV on a daily basis and to transact at that price. The mutual funds held by the Plan are classified as level 1.

    7


    The Quest Diagnostics Profit Sharing Plan
    December 31, 2025 and 2024
    Notes to Financial Statements (dollars in thousands) - continued



        Quest Diagnostics Common Stock and Other Common Stock classified as level 1: Valued at the closing price reported on the active market on which the individual securities are traded.

        Other Common Stock classified as level 3: Valued using a valuation technique based on available information, which may consider market-based valuation multiples; a discount or premium from market value of a similar, freely traded equity security of the same issuer; or some combination.  These fair value measurements are classified within Level 3 of the fair value hierarchy as the fair value is based on significant inputs that are not observable.

        Collective Funds: Valued at NAV per unit as determined by the trustee at year end. The NAV is used as a practical expedient to estimate fair value.
            
        The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.
        
    4.     Commitments and Contingencies

        In 2020, two putative class action lawsuits were filed in the U.S. District Court for New Jersey against the Company and other defendants with respect to the Plan. The complaint alleges, among other things, that the fiduciaries of the Plan breached their duties by failing to disclose the expenses and risks of plan investment options, allowing unreasonable administration expenses to be charged to plan participants, and selecting and retaining high cost and poor performing investments. The Plan itself is not named as a defendant. In October 2020, the court consolidated the two lawsuits under the caption In re: Quest Diagnostics ERISA Litigation and plaintiffs filed a consolidated amended complaint. In May 2021, the court denied the Company's motion to dismiss the complaint. After discovery was completed, the Company filed a motion for summary judgment, which was granted. The matter is on appeal.    
    8


    The Quest Diagnostics Profit Sharing Plan
    EIN: #38-2084239 Plan: #333    
        
    Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year)
    December 31, 2025 (dollars in thousands)

    (a)(b)
    Identity of Issue, Borrower, Lessor, or Similar Party
    (c)
    Description
    (d)
    Cost
    (e)
    Current
    Value
    *Fidelity Freedom Blend 2010 TCollective Fund***$19,293 
    *Fidelity Freedom Blend 2015 TCollective Fund***51,191 
    *Fidelity Freedom Blend 2020 TCollective Fund***161,359 
    *Fidelity Freedom Blend 2025 TCollective Fund***408,245 
    *Fidelity Freedom Blend 2030 TCollective Fund***656,013 
    *Fidelity Freedom Blend 2035 TCollective Fund***593,796 
    *Fidelity Freedom Blend 2040 TCollective Fund***474,987 
    *Fidelity Freedom Blend 2045 TCollective Fund***358,119 
    *Fidelity Freedom Blend 2050 TCollective Fund***241,734 
    *Fidelity Freedom Blend 2055 TCollective Fund***154,613 
    *Fidelity Freedom Blend 2060 TCollective Fund***86,956 
    *Fidelity Freedom Blend 2065 TCollective Fund***35,726 
    *Fidelity Freedom Blend Income TCollective Fund***19,341 
    *Fidelity Managed Income Portfolio II - Class 3Collective Fund***153,848 
    *Fidelity Contrafund Comingled PoolCollective Fund***487,077 
    *Fidelity OTC Comingled PoolCollective Fund***362,812 
    Spartan 500 Index Pool Class FCollective Fund***737,911 
    Spartan Extended Market Index Pool Class FCollective Fund***50,200 
    Spartan Total International Index Pool Class FCollective Fund***56,836 
    GW&K Small/Mid Cap FundCollective Fund***120,332 
    Prudential Core Plus Bond Fund Class 15Collective Fund***25,256 
    GQG Partners International Equity CIT Class DCollective Fund***90,855 
    State Street Short Term Investment FundCollective Fund***1,900 
      Total Interest in Collective Funds$5,348,400 
    T Rowe Price Government Reserve Investment FundMutual Fund***$2,000 
    Vanguard Total Bond Market Index Fund - Institutional Plus Share ClassMutual Fund***90,881 
    *Fidelity Investments Money Market Government Portfolio - Institutional ClassMutual Fund***119,351 
      Total Interest in Mutual Funds$212,232 
    *Quest Diagnostics IncorporatedCommon Stock***$310,165 
    9


    The Quest Diagnostics Profit Sharing Plan
    EIN: #38-2084239 Plan: #333    
        
    Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year)
    December 31, 2025 (dollars in thousands)

    (a)(b)
    Identity of Issue, Borrower, Lessor, or Similar Party
    (c)
    Description
    (d)
    Cost
    (e)
    Current
    Value
    Accenture Plc CL AOther Common Stock***$534 
    Advanced Micro Devices IncOther Common Stock***1,678 
    Adyen Bv ADROther Common Stock***1,210 
    Agco CorpOther Common Stock***824 
    Alliant Energy CorporationOther Common Stock***267 
    Allstate CorporationOther Common Stock***1,639 
    Alphabet Inc CL AOther Common Stock***13,928 
    Alphabet Inc CL COther Common Stock***4,670 
    Amazon.Com IncOther Common Stock***10,240 
    Ameren CorpOther Common Stock***1,639 
    American International GroupOther Common Stock***1,188 
    Amphenol Corporation CL AOther Common Stock***4,715 
    Apple IncOther Common Stock***17,323 
    Applied Materials IncOther Common Stock***1,128 
    Applovin CorpOther Common Stock***1,880 
    Ares Management Corp CL AOther Common Stock***408 
    Argenx Se Sponsored ADROther Common Stock***1,534 
    Arista Networks IncOther Common Stock***3,005 
    Astrazeneca Plc Spons ADROther Common Stock***949 
    Avalonbay Communities Inc ReitOther Common Stock***1,582 
    Bank Of America CorporationOther Common Stock***3,068 
    Becton Dickinson & CoOther Common Stock***896 
    Block Inc CL AOther Common Stock***4,606 
    Boeing CoOther Common Stock***3,023 
    Broadcom IncOther Common Stock***9,779 
    Cf Industries Holdings IncOther Common Stock***803 
    Chipotle Mexican Grill IncOther Common Stock***1,181 
    Chubb LtdOther Common Stock***2,565 
    Ciena CorpOther Common Stock***1,029 
    Cigna Group (The)Other Common Stock***1,849 
    Cisco Systems IncOther Common Stock***262 
    Citigroup IncOther Common Stock***2,007 
    Coca Cola CoOther Common Stock***767 
    Colgate-Palmolive CoOther Common Stock***1,953 
    ConocophillipsOther Common Stock***2,602 
    Coupang Inc AOther Common Stock***1,032 
    Csx CorpOther Common Stock***2,451 
    10


    The Quest Diagnostics Profit Sharing Plan
    EIN: #38-2084239 Plan: #333    
        
    Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year)
    December 31, 2025 (dollars in thousands)

    (a)(b)
    Identity of Issue, Borrower, Lessor, or Similar Party
    (c)
    Description
    (d)
    Cost
    (e)
    Current
    Value
    Cummins IncOther Common Stock***$861 
    CVS Health CorpOther Common Stock***1,784 
    Danaher CorpOther Common Stock***1,116 
    Datadog Inc CL AOther Common Stock***1,391 
    Disney (Walt) CoOther Common Stock***950 
    Doordash IncOther Common Stock***1,438 
    Elevance Health IncOther Common Stock***2,522 
    Eli Lilly & CoOther Common Stock***4,243 
    Entegris IncOther Common Stock***1,765 
    Eog Resources IncOther Common Stock***631 
    Equifax IncOther Common Stock***505 
    Equitable Holdings IncOther Common Stock***991 
    Expand Energy CorpOther Common Stock***706 
    Exxon Mobil CorpOther Common Stock***1,604 
    FabrinetOther Common Stock***1,161 
    Fifth Third BancorpOther Common Stock***271 
    Fortive CorpOther Common Stock***1,470 
    GE AerospaceOther Common Stock***1,255 
    Hartford Insurance Group Inc/TheOther Common Stock***1,254 
    Home Depot IncOther Common Stock***1,833 
    Howmet Aerospace IncOther Common Stock***2,717 
    Hubspot IncOther Common Stock***2,620 
    Huntington Bancshares IncOther Common Stock***1,061 
    Ingersoll Rand IncOther Common Stock***953 
    Intel CorpOther Common Stock***614 
    International Paper CoOther Common Stock***1,400 
    Intuit IncOther Common Stock***4,706 
    Intuitive Surgical IncOther Common Stock***4,072 
    Johnson & JohnsonOther Common Stock***813 
    Keysight Technologies IncOther Common Stock***1,228 
    L3Harris Technologies IncOther Common Stock***1,889 
    Las Vegas Sands CorpOther Common Stock***730 
    Lattice Semiconductor CorpOther Common Stock***1,447 
    Linde PLCOther Common Stock***836 
    Mastercard Inc CL AOther Common Stock***5,885 
    Mercadolibre IncOther Common Stock***1,960 
    Merck & Co Inc NewOther Common Stock***1,598 
    Meta Platforms Inc CL AOther Common Stock***7,622 
    11


    The Quest Diagnostics Profit Sharing Plan
    EIN: #38-2084239 Plan: #333    
        
    Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year)
    December 31, 2025 (dollars in thousands)

    (a)(b)
    Identity of Issue, Borrower, Lessor, or Similar Party
    (c)
    Description
    (d)
    Cost
    (e)
    Current
    Value
    Metlife IncOther Common Stock***$2,144 
    Microsoft CorpOther Common Stock***22,859 
    Middleby CorpOther Common Stock***748 
    Mongodb Inc CL AOther Common Stock***1,503 
    Natera IncOther Common Stock***1,852 
    Netflix IncOther Common Stock***2,070 
    News Corp New CL AOther Common Stock***668 
    Nvidia CorpOther Common Stock***21,467 
    Philip Morris Intl IncOther Common Stock***1,514 
    Procter & Gamble CoOther Common Stock***2,332 
    Qualcomm IncOther Common Stock***1,716 
    Rexford Industrial Realty IncOther Common Stock***1,043 
    Rocket Cos IncOther Common Stock***470 
    Rockwell Automation IncOther Common Stock***823 
    RPM International IncOther Common Stock***796 
    Salesforce IncOther Common Stock***1,512 
    Samsung Elec Vtg Gdr RegsOther Common Stock***1,812 
    Sanofi Spon ADROther Common Stock***389 
    Schwab Charles CorpOther Common Stock***3,228 
    SempraOther Common Stock***1,186 
    Servicenow IncOther Common Stock***2,408 
    Shopify Inc CL AOther Common Stock***1,270 
    Siemens AG (REGD)Other Common Stock***1,199 
    SLB LtdOther Common Stock***820 
    Southern CoOther Common Stock***1,669 
    Stanley Black & Decker IncOther Common Stock***1,356 
    Stryker CorpOther Common Stock***2,234 
    TE Connectivity PLCOther Common Stock***310 
    Texas Instruments IncOther Common Stock***1,265 
    The Booking Holdings IncOther Common Stock***2,255 
    Thermo Fisher Scientific IncOther Common Stock***645 
    T-Mobile US IncOther Common Stock***1,118 
    Totalenergies SEOther Common Stock***1,192 
    Tower Semicondctr LtdOther Common Stock***845 
    Tradeweb Markets Inc AOther Common Stock***1,477 
    United Parcel Service Inc CL BOther Common Stock***96 
    Unitedhealth Group IncOther Common Stock***3,061 
    US Bancorp DelOther Common Stock***2,126 
    12


    The Quest Diagnostics Profit Sharing Plan
    EIN: #38-2084239 Plan: #333    
        
    Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year)
    December 31, 2025 (dollars in thousands)

    (a)(b)
    Identity of Issue, Borrower, Lessor, or Similar Party
    (c)
    Description
    (d)
    Cost
    (e)
    Current
    Value
    Viatris IncOther Common Stock***$1,115 
    Visa Inc CL AOther Common Stock***4,891 
    Walmart IncOther Common Stock***553 
    Wells Fargo & CoOther Common Stock***1,803 
    Weyerhaeuser CoOther Common Stock***911 
    Williams Companies IncOther Common Stock***523 
    Zimmer Biomet Hldgs IncOther Common Stock***1,930 
      Total Interest in Other Common Stock$287,320 
    Investments at Fair Value$6,158,117 
    *Notes Receivable from Participants**Loans$70,137 
    TOTAL$6,228,254 
    *Party-in-interest to the Plan.
    **
    Rates range from 3.25% to 10.50%; maturities vary by participant.
    ***The cost of participant-directed investments is not required to be disclosed.

    13


    Signature

    Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned, hereunto duly authorized.

    June 18, 2026            

    The Quest Diagnostics Profit Sharing Plan


    By:  /s/ Cecilia K. McKenney
    Cecilia K. McKenney
    Senior Vice President, Chief Human Resources Officer and Member of the Benefits Administration Committee of Quest Diagnostics Clinical Laboratories, Inc.




    14
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    4 - QUEST DIAGNOSTICS INC (0001022079) (Issuer)

    6/8/26 4:32:30 PM ET
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    CEO and President Davis J. E. sold $1,941,400 worth of shares (10,000 units at $194.14) as part of a pre-agreed trading plan, decreasing direct ownership by 7% to 132,423 units (SEC Form 4)

    4 - QUEST DIAGNOSTICS INC (0001022079) (Issuer)

    6/2/26 6:38:38 PM ET
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    Director Carter Robert B was granted 1,142 shares, increasing direct ownership by 42% to 3,853 units (SEC Form 4)

    4 - QUEST DIAGNOSTICS INC (0001022079) (Issuer)

    5/21/26 4:59:34 PM ET
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    $DGX
    Analyst Ratings

    Analyst ratings in real time. Analyst ratings have a very high impact on the underlying stock. See them live in this feed.

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    Quest Diagnostics upgraded by Barclays with a new price target

    Barclays upgraded Quest Diagnostics from Equal Weight to Overweight and set a new price target of $210.00

    1/30/26 6:40:39 AM ET
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    Quest Diagnostics downgraded by Robert W. Baird with a new price target

    Robert W. Baird downgraded Quest Diagnostics from Outperform to Neutral and set a new price target of $194.00

    8/25/25 8:10:20 AM ET
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    Redburn Atlantic initiated coverage on Quest Diagnostics with a new price target

    Redburn Atlantic initiated coverage of Quest Diagnostics with a rating of Buy and set a new price target of $195.00

    4/2/25 8:51:11 AM ET
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    Quest Diagnostics to Release Second Quarter Financial Results on July 23, 2026

    SECAUCUS, N.J., June 17, 2026 /PRNewswire/ -- Quest Diagnostics Incorporated (NYSE:DGX), a leader in diagnostic information services, announced today that it will report its second quarter 2026 financial results on Thursday, July 23, 2026, before the market opens. It will hold its quarterly conference call to discuss the results beginning at 8:30 a.m. Eastern Time on that day. The conference call can be accessed by dialing 888-455-0391 within the U.S. and Canada, or 773-756-0467 internationally, using the passcode: "7895081." The earnings release and live webcast will be posted on www.QuestDiagnostics.com/investor. The company

    6/17/26 9:00:00 AM ET
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    Quest Diagnostics Declares Quarterly Cash Dividend

    SECAUCUS, N.J., May 19, 2026 /PRNewswire/ -- Quest Diagnostics (NYSE:DGX), a leader in diagnostic information services, today announced that its Board of Directors declared a quarterly cash dividend of $0.86 per share, payable on July 22, 2026 to shareholders of record of Quest Diagnostics common stock on July 8, 2026. About Quest DiagnosticsQuest Diagnostics works across healthcare to create a healthier world, one life at a time. We connect people, from clinicians to consumers, with laboratory insights that illuminate a path to better health. With a focus on delivering smarter,

    5/19/26 4:37:00 PM ET
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    Quest Diagnostics Reports First Quarter 2026 Financial Results; Raises Revenue and EPS Guidance for Full Year 2026

    First quarter revenues of $2.90 billion, up 9.2% from 2025, with 9.0% organic revenue growthFirst quarter reported diluted earnings per share ("EPS") of $2.24, up 15.5% from 2025; and adjusted diluted EPS of $2.50, up 13.1% from 2025Full year 2026 reported diluted EPS now expected to be between $9.58 and $9.78; and adjusted diluted EPS is expected to be between $10.63 and $10.83SECAUCUS, N.J., April 21, 2026 /PRNewswire/ -- Quest Diagnostics Incorporated (NYSE:DGX), a leading provider of diagnostic information services, today announced financial results for the first quarter ended March 31, 2026.

    4/21/26 6:47:00 AM ET
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    Large Ownership Changes

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    SEC Form SC 13G/A filed by Quest Diagnostics Incorporated (Amendment)

    SC 13G/A - QUEST DIAGNOSTICS INC (0001022079) (Subject)

    2/13/24 5:12:21 PM ET
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    SEC Form SC 13G/A filed by Quest Diagnostics Incorporated (Amendment)

    SC 13G/A - QUEST DIAGNOSTICS INC (0001022079) (Subject)

    1/25/24 12:16:40 PM ET
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    SEC Form SC 13G/A filed by Quest Diagnostics Incorporated (Amendment)

    SC 13G/A - QUEST DIAGNOSTICS INC (0001022079) (Subject)

    2/7/23 1:25:52 PM ET
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    Sonora Quest and Laboratory Sciences of Arizona Announce Jennifer Erickson as CEO-Elect

    Jennifer Erickson succeeds longtime CEO David Dexter following more than 26 years of service PHOENIX, Jan. 15, 2026 /PRNewswire/ -- Sonora Quest Laboratories, together with its parent company Laboratory Sciences of Arizona (LSA), is pleased to announce the appointment of Jennifer Erickson as Chief Executive Officer-Elect. Erickson will take over from David Dexter, who is retiring this March after more than 26 years of leadership. Dexter joined Sonora Quest and LSA as president and CEO in 1999, where under his leadership, the company has grown tremendously, serving as the marke

    1/15/26 9:00:00 AM ET
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    Quanterix Appoints Everett Cunningham as President and CEO Effective January 19, 2026

    Planned Leadership Transition Positions Company for Growth Company Expects to Exceed Revenue and Cash Guidance for the Full Year 2025 Quanterix Corporation ("Quanterix" or the "Company") (NASDAQ:QTRX), a company transforming healthcare by accelerating biomarker breakthroughs from discovery to diagnostics, today announced that its Board of Directors (the "Board") has appointed Everett Cunningham as the Company's next President and Chief Executive Officer and a member of the Board, effective January 19, 2026. Mr. Cunningham will succeed Masoud Toloue, who will continue to serve as Chief Executive Officer until Mr. Cunningham assumes the role on January 19, 2026. Following Mr. Cunningham

    1/8/26 4:30:00 PM ET
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    Fitbit and Quest Diagnostics Collaborate to Advance Research on the Use of Wearable Devices to Improve Metabolic Health

    Study to evaluate how behavioral and sensor data from wearables and blood tests can be leveraged to help individuals better assess and manage their metabolic health SECAUCUS, N.J., Jan. 17, 2024 /PRNewswire/ -- Fitbit and Quest Diagnostics (NYSE:DGX), the world's leading provider of diagnostic information services, today announced a collaboration to study the potential of wearable devices to improve metabolic health, which influences risk of developing several diseases, including diabetes and heart disease. The Wearables for Metabolic Health (WEAR-ME) pilot study will pair beh

    1/17/24 8:58:00 AM ET
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