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Updated September 22, 2026. Quick answer: It depends which hat Oppenheimer & Co. is wearing. As your investment adviser, Oppenheimer & Co. owes you a fiduciary duty under the Investment Advisers Act of 1940. As your broker-dealer, Oppenheimer & Co. owes you Regulation Best Interest, a real and enforceable standard, but not a fiduciary duty. Oppenheimer & Co.’s own Form CRS states: “When we provide you with a recommendation as your broker-dealer or act as your investment adviser, we have to act in your best interest and not put our interest ahead of yours. … When we act as your investment adviser, we are a fiduciary.”
How it’s registered
From Oppenheimer & Co. Inc. Customer Relationship Summary (Form CRS) (June 15, 2026): “Oppenheimer & Co. Inc. is registered with the Securities and Exchange Commission (“SEC”) as both a broker-dealer and an investment adviser.”
The standard of conduct, in its own words
“When we provide you with a recommendation as your broker-dealer or act as your investment adviser, we have to act in your best interest and not put our interest ahead of yours. … When we act as your investment adviser, we are a fiduciary.”
On commissions: “If you open a brokerage account, you will pay a transaction based fee, generally called a commission, every time you buy or sell an investment.”
Fiduciary status by capacity
| Capacity | Registration | Standard you’re owed | Can earn commissions | Source |
|---|---|---|---|---|
| As your broker-dealer | SEC-registered broker-dealer | Regulation Best Interest (not a fiduciary duty) | Yes | Oppenheimer & Co. Inc. Customer Relationship Summary (Form CRS), June 15, 2026 |
| As your investment adviser | SEC-registered investment adviser | Fiduciary duty (Investment Advisers Act of 1940) | No (asset-based advisory fee: up to $15,000 a year, 3.00% on a $500,000 account, the published maximum) | Oppenheimer & Co. Inc. Customer Relationship Summary (Form CRS), June 15, 2026 |
What this means for what you pay
Fiduciary status is one input, not the whole picture. Oppenheimer & Co. discloses a published fee that runs up to $15,000 a year on a $500,000 account (the published maximum); see the full dollar breakdown from Oppenheimer & Co.’s own fee disclosure before deciding whether the standard of conduct here changes your answer.
If the answer above changes your mind about staying, see what it costs to leave Oppenheimer & Co., or read the general mechanics of switching financial advisors.
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- Oppenheimer & Co. Inc. Customer Relationship Summary (Form CRS) (June 15, 2026): https://reports.adviserinfo.sec.gov/crs/crs_249.pdf
- SEC Investment Adviser Public Disclosure, Oppenheimer & Co. Inc. (CRD #249): https://adviserinfo.sec.gov/firm/summary/249
- Oppenheimer & Co. Inc., SEC Form ADV filing: https://reports.adviserinfo.sec.gov/reports/ADV/249/PDF/249.pdf
Methodology. This page was built September 22, 2026, quoting directly from Oppenheimer & Co.’s own current Form CRS, with the source linked above; any distinction we could not independently confirm this session is named as an honest gap rather than presented as verified. Nothing here is personalized financial, tax, legal, or investment advice, and it is not a substitute for reading the firm’s own Form CRS. See our Editorial Policy, Corrections, Affiliate Disclosure, and Disclaimer.
What does it actually take to open an account? See Oppenheimer & Co.’s minimum investment, quoted verbatim from its own Form ADV Part 2A / wrap-fee brochure.
Weighing whether to move ahead? Read the full Oppenheimer & Co. review, including its fiduciary status and what it costs to leave.
Comparing Oppenheimer & Co. against other options? See Oppenheimer & Co. alternatives, including a flat-fee route and a robo/hybrid, plus a lower-fee full-service firm.