# Nicholas Oldham

> 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.

Page: https://find.wellspent.co/advisors/nicholas-oldham-5379115/
Built from SEC adviser records; last checked October 30, 2026.

## Facts

- **Firm:** Mainstreet RIA
- **Based in:** O'Fallon, Missouri
- **Fee model (firm's Form ADV):** Percentage of assets; Hourly; Fixed fees
- **Assets under management (firm):** $471.8M across 141 accounts
- **Credentials:** CFP
- **CRD:** 5379115 (https://adviserinfo.sec.gov/individual/summary/5379115)
- **SEC registration:** Investment adviser representative in MO, TX
- **Exams passed:** Series 66 (2008)
- **Firm size:** 3 employees
- **Disclosures:** None reported
- **Website:** https://mainstreet-ria.com

## Frequently asked questions

### 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.

## Sources

- SEC adviser records (https://adviserinfo.sec.gov/individual/summary/5379115): 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 and Form ADV: registration, exams, and firm facts, data as of October 29, 2026

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Source: Wellspent, the public graph of fee-only advisors (https://find.wellspent.co). No paid placement.