Nicholas Oldham
Mainstreet RIA · O'Fallon, Missouri
Nicholas Oldham is a fee-only financial advisor at Mainstreet RIA in O'Fallon, Missouri, who holds the CFP credential. Mainstreet RIA reports charging a percentage of assets, hourly fees and fixed fees on its Form ADV.
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Facts
| Firm | Mainstreet RIA |
|---|---|
| Based in | O'Fallon, Missouri |
| Fee model (firm's Form ADV) | Percentage of assets · Hourly · Fixed fees |
| Assets under management | $471.8M across 141 accounts |
| Credentials | CFP |
| SEC registration | Investment adviser representative in MO, TX · CRD 5379115 |
| Exams passed | Series 66 (2008) |
| Firm size | 3 employees |
| Disclosures | None reported |
| Website | mainstreet-ria.com |
How Nicholas's firm compares
- Mainstreet RIA's average account is about $3.3 million, from its Form ADV (assets managed divided by 141 accounts).
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Questions about Nicholas
Is Nicholas Oldham a fee-only financial advisor?
Yes, according to SEC records as of October 29, 2026: Nicholas holds no broker registration, and Mainstreet RIA reports no commissions, no broker-dealer, and no insurance sales or affiliated insurance agency on its Form ADV.
How does Nicholas charge for financial advice?
Nicholas's firm, Mainstreet RIA, reports charging a percentage of assets, hourly fees and fixed fees on its SEC Form ADV.
Where is Nicholas Oldham based?
Nicholas Oldham is based in O'Fallon, Missouri.
What credentials does Nicholas Oldham hold?
Nicholas Oldham holds the CFP credential.
Is Nicholas Oldham registered with the SEC?
Yes. Nicholas Oldham is registered as an investment adviser representative in MO and TX (CRD 5379115), per SEC Investment Adviser Public Disclosure data as of October 29, 2026.
How much does Mainstreet RIA manage?
Mainstreet RIA reports $471.8M across 141 accounts in assets under management.
How do I contact Nicholas Oldham?
Through Nicholas's website, mainstreet-ria.com.
What these terms mean: fee-only · fiduciary · CFP · CRD number · all terms
Other fee-only advisors in O'Fallon
Where this information comes from
- SEC adviser records : the firm's Form ADV reports no commissions, no broker-dealer, and no insurance sales or affiliated insurance agency, and the advisor holds no broker registration
- SEC Investment Adviser Public Disclosure : registration, exams, and the firm's Form ADV, data as of October 29, 2026
- Directory listing last checked October 30, 2026.
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