401(k) glossary

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Fiduciary & roles

3(38) fiduciary (investment manager)

Short definition

A 3(38) fiduciary is an investment manager, as defined in section 3(38) of ERISA, with discretion to choose and change a plan’s investments. It must be a registered investment adviser, bank or insurance company.

What a 3(38) fiduciary is

Section 3(38) of ERISA defines an “investment manager” as a fiduciary that has the power to manage, acquire or dispose of plan assets, that is a registered investment adviser, a bank or an insurance company, and that has acknowledged in writing that it is a fiduciary to the plan.

For a 401(k), a 3(38) manager typically selects the fund lineup and the default investment, monitors them and replaces funds when needed. It acts without asking the employer to approve each change.

Why it matters to employers

ERISA says that when an investment manager has been properly appointed, the plan’s other fiduciaries are not liable for the manager’s individual investment decisions. This is the largest transfer of investment responsibility available to an employer.

It is not a complete transfer. Appointing the manager is a fiduciary decision. You must choose the manager prudently, understand its fees and review its performance periodically. Keep a record of each review.

Example

An employer appoints a registered investment adviser as 3(38) manager under an investment management agreement. During the year the manager replaces an underperforming bond fund. The employer is told about the change and does not need to approve it. At its annual review, the employer checks the manager’s report against the plan’s investment policy statement and files the minutes.

Common mistakes

  • Assuming a 3(38) covers plan administration. Filings, notices and distributions are 3(16) duties.

  • Not having the written acknowledgment of fiduciary status.

  • Never reviewing the manager after appointment.

  • Assuming the manager is responsible for investments employees choose through a brokerage window. Usually it is not.

Basic Capital and this term

Basic Capital Advisors can serve as the 3(38) investment fiduciary for a plan’s fund menu; the service is optional and separate from recordkeeping.

Go deeper

Read the full employer guide related to: 3(38) fiduciary (investment manager)

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Sources

U.S. Code (govinfo.gov): 29 U.S.C. 1002 (ERISA section 3): Definitions (https://www.govinfo.gov/content/pkg/USCODE-2023-title29/html/USCODE-2023-title29-chap18-subchapI-subtitleA-sec1002.htm), retrieved 2026-11-11 U.S. Code (govinfo.gov): 29 U.S.C. 1105 (ERISA section 405): Liability for breach of co-fiduciary (https://www.govinfo.gov/content/pkg/USCODE-2023-title29/html/USCODE-2023-title29-chap18-subchapI-subtitleB-part4-sec1105.htm), retrieved 2026-11-11 U.S. Department of Labor, EBSA: Meeting your fiduciary responsibilities (https://www.dol.gov/agencies/ebsa/about-ebsa/our-activities/resource-center/publications/meeting-your-fiduciary-responsibilities), retrieved 2026-11-11

General information, not legal or tax advice.

© 2026 Basic Capital. All rights reserved.

Basic Capital Group, Inc. and its affiliates and subsidiaries (collectively, "Basic Capital") provide this website and its contents for informational and educational purposes only. The information on this website is general in nature and is not intended to address the circumstances of any particular individual or entity.  Nothing on this website constitutes investment, financial, legal, tax, or accounting advice, nor should it be construed as a recommendation or endorsement of any specific investment product, strategy, or service. Basic Capital does not provide legal, tax, or accounting advice. You should consult with your own qualified financial, legal, and tax advisors before making any investment decisions. Our site uses a third party service to match browser cookies to your contact information. We then use another company to send special offers on our behalf.

Recordkeeping Services

Recordkeeping services are provided through Basic Capital Recordkeeping Services LLC, a wholly owned subsidiary of Basic Capital Group, Inc. Unless expressly agreed to in writing, Basic Capital Recordkeeping Services LLC does not act as a fiduciary under the Employee Retirement Income Security Act of 1974, as amended, with respect to any employee benefit plan.

Investment Advisory Services

Investment advisory services are provided through Basic Capital Advisors LLC, a wholly owned subsidiary of Basic Capital Group, Inc. registered with the State of New York as an investment adviser. Registration does not imply a certain level of skill or training. Investing involves risk, including the potential loss of principal. Past performance is not indicative of future results.
Investments in securities are: Not FDIC Insured • Not Bank Guaranteed • May Lose Value.
Neither Basic Capital Advisors LLC nor its affiliates are a registered broker-dealer or engage in securities brokerage activities. Furthermore, Basic Capital Advisors LLC and its affiliates do not act as a broker-dealer.

Basic Capital, 52 Walker Street, 5th Floor, New York, NY 10013 | 888-460-4901

© 2026 Basic Capital. All rights reserved.

Basic Capital Group, Inc. and its affiliates and subsidiaries (collectively, "Basic Capital") provide this website and its contents for informational and educational purposes only. The information on this website is general in nature and is not intended to address the circumstances of any particular individual or entity.  Nothing on this website constitutes investment, financial, legal, tax, or accounting advice, nor should it be construed as a recommendation or endorsement of any specific investment product, strategy, or service. Basic Capital does not provide legal, tax, or accounting advice. You should consult with your own qualified financial, legal, and tax advisors before making any investment decisions. Our site uses a third party service to match browser cookies to your contact information. We then use another company to send special offers on our behalf.

Recordkeeping Services

Recordkeeping services are provided through Basic Capital Recordkeeping Services LLC, a wholly owned subsidiary of Basic Capital Group, Inc. Unless expressly agreed to in writing, Basic Capital Recordkeeping Services LLC does not act as a fiduciary under the Employee Retirement Income Security Act of 1974, as amended, with respect to any employee benefit plan.

Investment Advisory Services

Investment advisory services are provided through Basic Capital Advisors LLC, a wholly owned subsidiary of Basic Capital Group, Inc. registered with the State of New York as an investment adviser. Registration does not imply a certain level of skill or training. Investing involves risk, including the potential loss of principal. Past performance is not indicative of future results.
Investments in securities are: Not FDIC Insured • Not Bank Guaranteed • May Lose Value.
Neither Basic Capital Advisors LLC nor its affiliates are a registered broker-dealer or engage in securities brokerage activities. Furthermore, Basic Capital Advisors LLC and its affiliates do not act as a broker-dealer.

Basic Capital, 52 Walker Street, 5th Floor, New York, NY 10013 | 888-460-4901

© 2026 Basic Capital. All rights reserved.

Basic Capital Group, Inc. and its affiliates and subsidiaries (collectively, "Basic Capital") provide this website and its contents for informational and educational purposes only. The information on this website is general in nature and is not intended to address the circumstances of any particular individual or entity.  Nothing on this website constitutes investment, financial, legal, tax, or accounting advice, nor should it be construed as a recommendation or endorsement of any specific investment product, strategy, or service. Basic Capital does not provide legal, tax, or accounting advice. You should consult with your own qualified financial, legal, and tax advisors before making any investment decisions. Our site uses a third party service to match browser cookies to your contact information. We then use another company to send special offers on our behalf.

Recordkeeping Services

Recordkeeping services are provided through Basic Capital Recordkeeping Services LLC, a wholly owned subsidiary of Basic Capital Group, Inc. Unless expressly agreed to in writing, Basic Capital Recordkeeping Services LLC does not act as a fiduciary under the Employee Retirement Income Security Act of 1974, as amended, with respect to any employee benefit plan.

Investment Advisory Services

Investment advisory services are provided through Basic Capital Advisors LLC, a wholly owned subsidiary of Basic Capital Group, Inc. registered with the State of New York as an investment adviser. Registration does not imply a certain level of skill or training. Investing involves risk, including the potential loss of principal. Past performance is not indicative of future results.
Investments in securities are: Not FDIC Insured • Not Bank Guaranteed • May Lose Value.
Neither Basic Capital Advisors LLC nor its affiliates are a registered broker-dealer or engage in securities brokerage activities. Furthermore, Basic Capital Advisors LLC and its affiliates do not act as a broker-dealer.

Basic Capital, 52 Walker Street, 5th Floor, New York, NY 10013 | 888-460-4901