In May 2000, StanCorp Investment Advisers was incorporated under the laws of the State of Oregon and registered with the Securities and Exchange Commission to act as a registered investment adviser under the Investment Advisers Act of 1940. StanCorp Investment Advisers is headquartered in Portland, Oregon. StanCorp Investment Advisers is wholly owned by StanCorp Financial Group, Inc., which also owns several other investment-related and non-investment related subsidiaries. Subsidiaries of StanCorp Financial Group commonly operate under the marketing name, “The Standard.” StanCorp Investment Advisers and its supervised persons who are authorized to provide investment-related services may be referred to as “us,” “we,” or “our,” while clients (i.e., plan sponsors) may be referred to as “you,” and “your” throughout this brochure. We offer investment management and advisory services to plan sponsors of employer-sponsored retirement plans that have retained Standard Retirement Services, Inc., an affiliated recordkeeper, to provide recordkeeping services for their employer-sponsored retirement plan. Our plan sponsor clients hire us to provide investment advice for the benefit of the plan and its participants. Individual participants cannot access our advisory programs unless our services are made available to them by their employer. Our services are available to defined contribution and benefit plans. Our primary service consists of maintaining an approved list of funds that is curated through our continuous research and due diligence. The management of the plan’s investment lineup may be offered on a non-discretionary or discretionary basis. Once the plan sponsor has selected the investments for the plan, we may be hired to provide investment advisory or management services to the plan and/or its participants. Unless we otherwise mutually agree, we are generally not responsible for initial lineup selection, including the inclusion of any investments issued by Standard Insurance Company. If we are hired to provide non-discretionary services, we often do so as an ERISA 3(21)(A)(ii) fiduciary to your plan and our fiduciary status will be stated in the investment advisory agreement. In providing non-discretionary services, we will provide recommendations regarding your plan’s investment lineup periodically, but it is your responsibility to accept those recommendations and provide instructions to Standard Retirement Services which as recordkeeper for the plan, will transmit such instructions to the executing broker-dealer. If we are hired to provide discretionary services, we will serve as an ERISA 3(38) fiduciary to your plan. In this capacity, we are responsible for reviewing and updating the investment lineup for your retirement plan at any time and at our discretion in accordance with the investment advisory services agreement and your investment policy statement without prior notice to you or your prior input. Our practice, however, is to provide advance notice, to the extent that it is reasonably practical to do so, of any material changes to your lineup. In addition to our investment lineup services, we also offer various asset allocation and investment advisory services to the plan and its participants as authorized by the plan sponsor. Through Target RiskTM Portfolios or Guided Portfolios, including any prior versions, we provide five non-discretionary asset allocation models that are based on risk tolerance and investment objectives only. These models are made available to plan sponsor clients of Standard Retirement Services. Neither Target Risk nor Guided Portfolios are based on the financial situation or investment need of any specific investor, and the model portfolios are not intended to be, and should be not construed as investment advice or a recommendation of any specific security or product. Our investment advisory services are solely limited to the creation and maintenance of these allocation models. You can choose to make them available to your plan participants so that they may elect to use them as a guide to assist them with making investment selections from the plan’s investment line up. By using Target Risk Portfolios, participants agree to authorize Standard Retirement Services to initiate rebalancing of their portfolio at a pre- determined time each year. In Guided Portfolios, participants are responsible for setting up rebalancing of their portfolio by contacting Standard Retirement Services or logging into their account online. In addition, both Target Risk and Guided Portfolio programs require that 100% of a participant’s account be invested in one portfolio. Making investment allocation changes, transfers, or auto-rebalancing requests will automatically remove a participant from the Target Risk or Guided Portfolio program. We also offer a program called Target Age® Portfolios, which are a series of age-based investment allocation models that plan sponsors can build from the plan’s available investment options. Target Age Portfolios are designed to rebalance and reallocate participant accounts to a more conservative allocation model as they age. Investment transfer restrictions may apply. The plan’s available investment options used within the models are subject to change at the discretion of the plan sponsor or other external factors. Target Age Portfolios are not based on the financial situation or investment need of any specific investor, and the model portfolios are not intended to be, and should be not construed as investment advice or a recommendation of any specific security or product. Our investment advisory services are solely limited to the creation and maintenance of these allocation models and the associated glidepath. Target Age Portfolios are rebalanced annually and requires that 100% of a participant’s account be invested in one portfolio. Making investment allocation changes, transfers, or auto-rebalancing requests will automatically remove a participant from the Target Age Portfolio program. Plan sponsors who want an investment solution that is constructed by us and periodically adjusts with the participant’s retirement time horizon may elect to offer our Target-Date

Portfolios to their participating employees. These are model portfolios that may be comparable to the investment allocations made by target date funds offered by individual mutual fund companies. The intent of our Target-Date Portfolios is to provide a single investment solution through a portfolio where asset allocation automatically becomes more conservative as the target date approaches. Transactions are initiated through a rebalancing of the model portfolio at least annually and are transmitted to the executing broker-dealer by Standard Retirement Services as recordkeeper for the plan. Target-Date Portfolio is not a fund. Rather, it is a portfolio of multiple funds. The use of Target-Date Portfolios is optional. For plan sponsors who wish to offer a more customized investment solution for their employees, we offer Mainspring Managed, a discretionary asset allocation program, powered by a proprietary advice engine, that manages a participant’s account on a continuous basis using our approved list of funds and provides contribution recommendations based on the participant’s investment objectives. We act as an ERISA 3(38) fiduciary to the plan’s participants who have enrolled in this program. Additionally, participants may provide information regarding assets held outside of their retirement plan to generate contribution recommendations that are tailored to their specific circumstances. Accounts invest in securities such as mutual funds, collective investment trusts, and cash equivalent options selected by the plan sponsor and/or their responsible fiduciary. Participants receive a quarterly progress report which details their investment strategy, profile, and action plan. Participation in Mainspring Managed is optional and participants may opt-in or out at any time. However, Mainspring Managed is only available to participants whose plan sponsor has elected to make the program available to its employees. The program may be terminated by the plan sponsor at any time in accordance with the agreement between the plan sponsor and us. Certain features offered through the retirement plan may affect the recommendations generated by the advice engine. For example, automatic escalation or contribution features as determined by the plan sponsor may not be consistent with the recommendations generated by the program. In these instances, the plan sponsor ultimately retains the responsibility for determining whether Mainspring Managed is appropriate for their plan considering any plan design features that may conflict with the program. In addition, Mainspring Managed is not available to plans that offer self-directed brokerage accounts. Plan sponsors should consult with their financial advisor or consult with a Standard Retirement Services consultant to understand any particular limitations of the program with respect to their retirement plan. At all times, plan sponsors and participants have the right to consult with their own financial advisor. However, these services are only available through us. At a minimum, Mainspring Managed requires a participant’s date of birth and current salary information to provide personalized recommendations. If no date of birth is provided by the employer, the account will not be invested, and Standard Retirement Services will place the account into a default fund chosen by the plan sponsor. If current salary information is not available, the program will assume the last known salary. A summary of the information that is used to develop and implement the program’s investment strategy is provided each quarter on the Savings and Investment Plan document. Participants are encouraged to review this information and contact Standard Retirement Services with updated information as necessary. Mainspring Managed may not be appropriate for investors older than 85 years or younger than 16 years, as the program will not generate any deferral recommendations. To the extent that a participant is contributing the maximum amount allowable by their plan but is still facing a shortfall with respect to their investment goals, the program will continue to generate contribution increase recommendations reflecting the increased amount needed to achieve the goal. Any such amount should be saved additionally outside of the plan and information regarding the amount of your outside assets should be updated on Personal Savings Center or by calling Standard Retirement Services. Participants may also choose to decline contribution increase recommendations generated through the program. By opting out of the contribution increase recommendation, participants may not be able to fully cover income needs at retirement, as calculated by the program and the management of your Mainspring Managed portfolio may not be consistent with your investment objectives. Participants should evaluate whether or not changes to their goals are necessary and/or whether the advisory program continues to be appropriate for their circumstances. All of our plan sponsor clients receive our Quarterly Monitoring Report which provides performance information regarding each of the investment options in the plan as well as a summary of our Investment Committee’s recommendations and decisions. Additionally, Mainspring Managed participants also receive a Savings and Investment Plan report each quarter which details the performance, activity, fees, investment goals for the account, as well as information on how to update their personal information or whom to contact for assistance with their account. We also provide sub-advisory services to the Reliance Advisory Portfolio Collective Investment Trusts, a series of 14 collective investment trusts sponsored by Reliance Trust Company. These portfolios consist of 10 fully diversified portfolios and four style-based portfolios which invest in various types of domestic and international equities and fixed income. These collective investment trusts are only available through Reliance Trust Company and retirement plan clients of Standard Retirement Services. We do not participate in wrap fee programs. Our total Regulatory Assets Under Management as of December 31, 2023, was $32,385,256,113.