O'FALLON, MOCRD 309150Latest ADV February 12, 2026
Mainstreet Ria LLC is an SEC registered investment adviser organized as a limited liability company with a primary office location in O'Fallon, MO. Its latest Form ADV filing, dated February 12, 2026, reports $446M in regulatory assets under management, 3 employees, and 206 accounts.
Assets Under Management
$446M
Employees
3
Offices
--
Total Clients
132
Primary office
O'FALLON, MO
6700 KEATON CORPORATE PARKWAY, SUITE 102, O'FALLON, MO, United States
Top client segmentIndividuals represent 78.8% of total clients.
Top client categories% of clientsClients
1
Individuals
78.8%
104
2
HNWI
17.4%
23
3
Pension Plans
3.8%
5
Regulatory Assets Under Management Breakdown
Total regulatory assets under management$446Mas of February 12, 2026
Discretionary100.0%
$446M
100% of total RAUM100.0%
Non-discretionary0.0%
$0
0% of total RAUM0.0%
All regulatory assets under management are discretionary.
Assets under management Growth by Quarter
Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.
Total AUM$446M
Total Accounts206
10Y AUM Change+$189M (+73.1%)
Employee Growth by Quarter
Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.
Total Employees3
Clients per Employee44:1
10Y Employee Change-1 (-25.0%)
* Metrics are based on the latest available data, including Form ADV filings, brochures, and relationship summaries pulled from the SEC IAPD, and may be subject to change. Learn what is included in the Rialytix data. Please refer to the firm's official disclosures for the most accurate information using their CRD number. This is not investment advice.