The following brief description of The Lubrizol Corporation Employees’ Profit Sharing and Savings Plan (the “Plan”) is provided for general information purposes only. Participants should refer to the Plan document for more complete information.

General—The Lubrizol Corporation (the “Company”) established the Plan for the purpose of encouraging employee long-term, tax-deferred savings for retirement. The Plan is subject to the reporting and disclosure requirements, the vesting standards and the fiduciary responsibility requirements of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”).

All investments of the Plan are held by Empower Trust Company, LLC (“Trustee”) in participant-directed investment funds and the Plan’s recordkeeper is Empower Retirement, LLC (“Empower”).

Administration—The Plan is administered by the Employee Benefits Administrative Committee (the “Committee”), which is appointed by the Chief Executive Officer of the Company. The Committee’s powers and duties relate to the issuance of interpretive rules and regulations in accordance with the Plan document, including determination of the method and timing of benefit distributions and authorization of disbursements from the Plan, as well as the selection of the recordkeeper.

The Retirement and Savings Plans Investment Committee, which is also appointed by the Chief Executive Officer of the Company, reviews and approves investment and funding strategies, objectives and policies, and makes any necessary or desirable changes; reviews, selects and monitors the performance of investment options for participants in the Plan; and appoints and removes investment managers, trustees, consultants and other service providers (other than the recordkeeper) and monitors the performance, fees and expenses of each. The Plan document and trust agreement provide that the Trustee of the Plan shall hold, invest, reinvest, manage, and administer all assets of the Plan as a trust fund for the exclusive benefit of participants and their beneficiaries.

Participation and Contributions—All regular employees of the Company and of participating subsidiaries and affiliates are eligible for participation on the first day of covered employment.

The combined before-tax (“CODA”), after-tax Roth 401(k) (“Roth”) and after-tax (“Supplemental”) contributions are limited to 75% of eligible compensation for both highly and non-highly compensated employees. Company Matching contributions equal 100% of an employee’s combined CODA, Roth and Supplemental contributions up to 6% of the employee’s eligible compensation. This matching contribution is intended to enable the Plan to meet the rules of a 401(k) safe harbor plan. The maximum eligible compensation set by the Internal Revenue Service for purposes of allocating Plan contributions was $350,000 and $345,000 for 2025 and 2024, respectively.

CODA and Company Matching contributions are excluded from the participants’ taxable income until such amounts are received by them as a distribution from the Plan. Roth and Supplemental contributions are made on an after-tax basis and are therefore included in the participants’ taxable income in the period of contribution. Participants who turned at least age 50 during 2025 or 2024 were eligible to elect to make an additional before-tax or Roth Catch-up contribution of up to $7,500 for 2025 and 2024, or up to $11,250 for participants who turned age 60, 61, 62, or 63 for 2025, if they met one of the following conditions:

Newly eligible employees, both new hires and rehires, are subject to automatic enrollment. Participants will be automatically enrolled in the Plan at a CODA contribution rate of 6%.

There is a 30-day opt-out period during which participants may change their CODA contribution rate or elect not to contribute (“opt-out”). If participants do not make a positive election or opt-out, contributions will begin to be withheld as soon as administratively possible following the end of the 30-day period. CODA contributions and Company Matching contributions will be invested in the applicable State Street Target Retirement Fund that most closely matches a retirement age of 65. Once enrolled, participants may choose to change the election percentage, reallocate investments or stop contributing at any time.

For participants who become participants on or before January 1 of the current year with plan contribution rates between 0% and 14% of pay (whether those contributions are CODA, Roth, Supplemental, or any combination) as of July 1 of the current year, such participants will automatically have their CODA contribution rate increase to the next higher full percent starting the first full pay period after July 1 of the current year (or as soon thereafter as administratively practicable). Automatic escalation will continue each year until participants are contributing 15%, which is an increase from 10% in 2024.

For participants who become participants after January 1 of any year, automatic escalation will work as described above, except that the first automatic escalation will not occur until July 1 of the year following the year a participant was hired.

The Plan offers various investment alternatives, maintains separate accounts for each participant, and invests contributions and earnings, as required by the Plan or as directed by each participant, in one or more of the following funds:

The Stable Value Fund invests in stable value investment contracts issued by banks, insurance companies and other financial institutions and a diversified portfolio of fixed income instruments including U.S. Government and agency securities, mortgage-backed securities, asset-backed securities, corporate bonds, interest rate futures and options. Goldman Sachs Asset Management manages the investments of the fund.

The Core Fixed Income Fund invests in a mutual fund, the Baird Aggregate Bond Fund. The fund invests in fixed income instruments including U.S. Government and corporate bond securities, mortgage and asset-backed securities, U.S. dollar and non-U.S. dollar denominated securities of non-U.S. issuers.

The Target Retirement Income Fund is an actively managed collective trust fund by State Street Investment Management and invests in a combination of U.S. and international equity securities, fixed income securities, alternative investments such as real estate securities index funds and commodity index funds and cash with a current target asset allocation of 65% fixed income and 35% in equities, real estate and commodities. The fund’s objective is to allocate its assets across multiple asset classes while seeking to achieve the appropriate level of risk for a retired participant or a participant who anticipates retiring in the near-term.

The Target Retirement 2025 Fund is an actively managed collective trust fund by State Street Investment Management and invests in a combination of U.S. and international equity securities, fixed income securities, alternative investments such as real estate securities index funds and commodity index funds and cash with a current target asset allocation of 54% fixed income and 46% in equities, real estate and commodities. The fund’s objective is to allocate its assets across multiple asset classes while seeking to achieve the appropriate level of risk given a participant’s anticipated retirement date in or within a few years of 2025.

The Target Retirement 2030 Fund is an actively managed collective trust fund by State Street Investment Management and invests in a combination of U.S. and international equity securities, fixed income securities, alternative investments such as real estate securities index funds and commodity index funds and cash with a current target asset allocation of 42% fixed income and 58% equities, real estate and commodities. The fund’s objective is to allocate its assets across multiple asset classes while seeking to achieve the appropriate level of risk given a participant’s anticipated retirement date in or within a few years of 2030.

The Target Retirement 2035 Fund is an actively managed collective trust fund by State Street Investment Management and invests in a combination of U.S. and international equity securities, fixed income securities, alternative investments such as real estate securities index funds and commodity index funds and cash with a current target asset allocation of 31% fixed income and 69% in equities and real estate. The fund’s objective is to allocate its assets across multiple asset classes while seeking to achieve the appropriate level of risk given a participant’s anticipated retirement date in or within a few years of 2035.

The Target Retirement 2040 Fund is an actively managed collective trust fund by State Street Investment Management and invests in a combination of U.S. and international equity securities, fixed income securities, alternative investments such as real estate securities index funds and commodity index funds and cash with a current target asset allocation of 24% fixed income and 76% equities. The fund’s objective is to allocate its assets across multiple asset classes while seeking to achieve the appropriate level of risk given a participant’s anticipated retirement date in or within a few years of 2040.

The Target Retirement 2045 Fund is an actively managed collective trust fund by State Street Investment Management and invests in a combination of U.S. and international equity securities, fixed income securities, alternative investments such as real estate securities index funds and commodity index funds and cash with a current target asset allocation of 17% fixed income and 83% in equities. The fund’s objective is to allocate its assets across multiple asset classes while seeking to achieve the appropriate level of risk given a participant’s anticipated retirement date in or within a few years of 2045.

The Target Retirement 2050 Fund is an actively managed collective trust fund by State Street Investment Management and invests in a combination of U.S. and international equity securities, fixed income securities, alternative investments such as real estate securities

The Plan has an investment contract with Goldman Sachs Asset Management through which both traditional and synthetic GICs can be held in the Plan’s Stable Value Fund. Traditional GICs are unsecured, general account obligations of insurance companies. The obligation is backed by the general account assets of the insurance company that writes the investment contract. The crediting rate on this product is typically fixed for the life of the investment. A separate account GIC is similar to a traditional GIC except investments are segregated in separate accounts maintained by an insurance company for the benefit of the investors. The total return of the segregated account assets supports the separate account GIC’s return. The crediting rate on this product will reset periodically but will not have an interest rate of less than 0%.

General fixed maturity synthetic GICs consist of an asset or collection of assets that are owned by the fund and a benefit-responsive, book value wrap contract purchased for the portfolio. The wrap contract provides book value accounting for the asset and assures that book value, benefit-responsive payments will be made for participant-directed withdrawals from the Stable Value Fund. The crediting rate of the contract is set at the start of the contract and typically resets monthly. The initial crediting rate is established based on the market interest rates at the time the initial asset is purchased but will not be less than 0%.

Constant duration synthetic GICs consist of a portfolio of securities owned by the fund and a benefit-responsive, book value wrap contract purchased for the portfolio. The wrap contract amortizes gains and losses of the underlying securities over the portfolio duration and assures that book value, benefit-responsive payments will be made for participant-directed withdrawals from the Stable Value Fund. The crediting rate on a constant duration synthetic GIC resets every month based on the book value of the contract and the market yield, market value and average duration of the underlying assets. The crediting rate aims at converging the book value of the contract and the market value of the underlying portfolio over the duration of the contract and therefore will be affected by movements in interest rates and/or changes in the market value of the underlying portfolio. The initial crediting rate is established based on the market interest rates at the time the underlying portfolio is first put together but will not be less than 0%.

Withdrawals and transfers resulting from certain events, including employer-initiated events and changes in the qualification of the Plan, may limit the ability of the Stable Value Fund to transact at book or contract value. These events may cause liquidation of all or a portion of a contract at market value. The Plan administrator does not believe that the occurrence of any event that would limit the Plan’s ability to transact at book or contract value is probable. All contracts are fully benefit-responsive.

The components of investments at contract value at December 31, 2025 and 2024 were $121,066,889 and $128,966,334 of Synthetic GICs, respectively, and $3,099,392 and $3,327,172 of cash and equivalents, respectively.

The Plan estimates the fair value of investments using available market information and generally accepted valuation methodologies. Fair value is defined as the price that would be received to sell an asset or would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. The inputs used to measure fair value are classified into three levels: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The following is a description of the valuation methodologies used for assets measured at fair value:

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. There have been no changes in the methodologies used from 2024 to 2025. Furthermore, while 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.

The Plan holds various investment securities. Investment securities are exposed to various risks such as interest rate, market, and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participants’ account balances and the amounts reported in the Statement of Net Assets Available for Benefits.

The Plan invests in Class B shares of Berkshire Hathaway within the Berkshire Hathaway Class B stock fund. A total of 2,427 and 7,464 Class B shares for 2025 and 2024, respectively, of Berkshire Hathaway at a cost of $1,250,722 and $3,031,680 respectively, were purchased within the fund. All purchased shares were acquired at the then current market value on the open market. In addition, during the years ended December 31, 2025 and 2024, the fund sold or distributed to participants 21,829 and 20,976 Class B shares, respectively, of Berkshire Hathaway and received proceeds of $10,721,074 and $8,870,165, respectively. The realized gains on these sales were $7,146,211 and $5,589,735 for 2025 and 2024, respectively.

Fees charged to individual participant accounts for loan initiations, QDROs and brokerage account maintenance and paid to the Trustee, during the years ended December 31, 2025 and December 31, 2024 were $53,777 and $47,972, respectively. Fees charged to individual participant accounts for investment advice service and paid to Empower Advisory Group, LLC and Advised Assets Group, LLC during the years ended December 31, 2025 and December 31, 2024 were $737,440 and $677,784, respectively.

The Plan obtained its latest determination letter dated August 24, 2017, in which the Internal Revenue Service stated that the Plan, as then designed, was in compliance with the applicable requirements of Section 401 of the Internal Revenue Code. The Plan has been amended since receiving this determination letter. However, the Company believes that the Plan currently is designed and is being operated in compliance with the applicable requirements of the Internal Revenue Code. Therefore, no provision for income taxes has been included in the Plan’s financial statements.

The Plan administrator has analyzed the tax positions taken by the Plan and has concluded that, as of December 31, 2025, there are no uncertain positions taken or expected to be taken that would require such recognition or disclosure in the financial statements.

The Plan was adopted with the expectation that it will continue indefinitely. The Company may, however, terminate the Plan at any time. In addition, the management of any subsidiary may withdraw such subsidiary from the Plan at any time. In the event of termination of the Plan, all participants immediately will become fully vested in the value of their account balances.

SCHEDULE H LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR)

EIN 34-0367600 - PLAN NO. 003

DECEMBER 31, 2025