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Mainstreet RIA LLC

Mainstreet RIA LLC. CRD 309150

Mainstreet RIA LLC logo

CRD: 309150

Mainstreet RIA LLC

$446.4M Total AUM
$446.4M Disc. AUM
13.8% 3Y CAGR
3 Employees
134 ADV. Clients
6 yrs Firm Age

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Firm Details

Custodian
Charles Schwab & Company · LPL Financial · Merrill Lynch
Clients
Retail and Institutional
Established Date
07-06-2020
Office Locations
1

Office Locations

6700 Keaton Corporate Parkway Suite 102 O'fallon MO

About Mainstreet RIA LLC

Mainstreet RIA LLC provides fiduciary retirement plan advisory services to employers/plan sponsors, helping improve 401(k) offerings and keep participant needs first. The firm benchmarks plan fees and services, sources and compares recordkeeper quotes, and supports recordkeeper transitions. Ongoing service includes plan reviews, IPS development, legislative updates (including SECURE Act 2.0 options), and quarterly fund monitoring with custom pass/fail screening against peer groups.

Reported data analysis

What the numbers show

Between January 15, 2025 and February 12, 2026, reported AUM increased 13.8%, from $392.2M to $446.4M.

Across 5 reported observations, AUM increased 55.3% between August 30, 2022 and February 12, 2026, from $287.4M to $446.4M.

Of the latest reported AUM, 100.0% is discretionary and 0.0% is non-discretionary.

The firm reports 3 advisory representatives and 134 clients, or 44.7 clients per representative. That equates to $3.3M in reported AUM per client.

The profile lists 1 reported office location and 6 years in operation. The source data was last updated on February 12, 2026. Figures reflect reported regulatory data and may not include subsequent changes.

Team overview

-- AVG AGE
$148.8M AVG AUM / ADVISOR
$3.3M AVG AUM / CLIENT
5.9 yrs AVG TENURE
3 Employees
3 Advisory Reps
3 RIA Reps
6yrs Firm Age

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Available data coverage

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  • Client Personas
  • Custodian
  • Investment Themes
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  • Services
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Owner & Executives

R

RICHARD LEE COUNTS

INVESTMENT ADVISOR REPRESENTATIVE, Managing Partner, Retirement Plan Advisor

CRD
#2428369
Ownership
25% but less than 50%
Nicholas S Oldham

Nicholas S Oldham

Chief Compliance Officer, INVESTMENT ADVISOR REPRESENTATIVE, Managing Partner

CRD
#5379115
Ownership
25% but less than 50%

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Contacts

No contact records available.

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Assets Under Management

Total AUM
Discretionary
Non-Discretionary
08-30-2022
10-13-2023
07-16-2024
01-15-2025
02-12-2026
Category Assets AVG. Account size
Discretionary $446,355,239 $2,166,773
Non-Discretionary $0 --
Total $446,355,239 $2,166,773

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Separately Managed Accounts

SMA allocation detail is available

Mainstreet RIA LLC has reported separately managed account data across 4 asset classes. AdvizorPro provides the associated asset values, allocation percentages, and exportable breakdown.

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