Wednesday, October 21, 2026The Morning EditionOpen AtlasSign inJoin free
FinancialADVSR

Est. 2026The front page of wealth managementNew York

The Morning EditionFree · 6:30 AM ETSubscribe
IN SpaceX’s AI segment now drives more than half its revenue. Here’s what advisors should watch nextFP Why AI might recommend your competitor instead of youFP Why clients are choosing phased retirement — and what advisors should know4K SPARK Forum Offering Scholarships for Retirement Plan AdvisorsFP What Schwab's new ETF platform fees mean for clients, advisorsWM RIA Platform Leaders Ask ‘What’s the Advantage in Having Your Own Form ADV?’IN Fake e-vite phishing scams put high-net-worth clients at riskRB Rick Wurster says Schwab is tackling its forced rationing of long/short SMAs with proprietary 'offering' to stretch balance sheet, but it may be more about a fee upside, a long/short manager saysIN Fintech bytes: 55ip, Vise, Syntax push tax-smart tools for RIAsWM $20B Modera Wealth Management Launches AI Operating Platform

Wealth manager, independent · Grand Blanc, MI

Mainstay Capital Management, LLC

SEC-registered investment adviser · CRD 109528 · SEC 801-58099

At a glance

Mainstay Capital Management, LLC is an SEC-registered investment adviser based in Grand Blanc, Michigan, with $5.3B in regulatory assets under management as of its Form ADV filed July 15, 2026. It reports 3,454 individual clients, 1,664 of them high-net-worth, holding an average of about $1.4 million each, and 33 employees. That ranks it 200th among the nation’s 5,657 independent wealth management RIAs and 3rd of 178 in Michigan. It reports 2 custodians for its clients’ separately managed accounts: Charles Schwab and BNY Pershing.

Up $469M from $4.8B in its previous filing; rank 232 → 200. This month’s movers →

Main office 866-444-6246mainstaycapital.comLinkedInAs filed on Form ADV

Regulatory AUM
$5.3B
Rank among independent wealth managers
#200 of 5,657
Rank among all SEC RIAs
#2,013 of 17,210
Rank in Michigan
#3 of 178
Individual clients
3,454
High-net-worth clients
1,664
Accounts
3,460
Discretionary
88% of AUM
Employees
33
Advisory staff
19
Offices
5

Owners and executives on its Form ADV

Custody and brokerage

Broker-dealer

No broker-dealer ties

Mainstay Capital Management, LLC reports no employees registered with a broker-dealer and no affiliated broker-dealer.

Other RIAs with no broker-dealer ties

Who it serves

Client typeClientsRegulatory AUMShare
High-net-worth individuals1,664$4.1B78%
Individuals1,790$812M15%
Banking or thrift institutions–$372M7%
Corporations or other businesses–$3M<1%

Disciplinary disclosures

Mainstay Capital Management, LLC reports no disciplinary disclosures in Item 11 of Form ADV. Read the details on the SEC’s adviser search ↗

Services

  • Financial planning
  • Portfolio management for individuals and small businesses
  • Educational seminars and workshops

How it’s paid

  • A percentage of assets under management
  • Fixed fees

AtlasMembers

The full record on Mainstay Capital Management, LLC

Ten years of SEC filings, its owners and contacts, and how it stacks up against its peers. Atlas members see all of it.

Assets, accounts, clients and staff, ten years of filings
Locked
Growth over one, three and five years
Locked
Rank against 770 peers of its type and size
Locked
Owners and executives, with titles and stakes
2 namedLocked
Main office, fax and compliance officer
Locked
Filing changes this year, with alerts
5Locked
Open Atlas free

Free while Atlas launches: create a free account and confirm your email. Every figure comes from SEC filings.

Similar-size RIAs in Michigan

All of Michigan →
FirmRegulatory AUMClients
Plante Moran Financial AdvisorsSouthfield$27B3,988
SPCANN Arbor$6.1B30,595
Rehmann WealthLansing$5.3B2,186
Advance Capital Management IncSouthfield$5.0B7,287
CG Advisory ServicesWilliamston$4.6B4,898
Advisory Alpha, LLCHolland$4.4B8,799

Background

Questions

How much does Mainstay Capital Management, LLC manage?

Mainstay Capital Management, LLC reports $5.3B in regulatory assets under management across 3,460 accounts, 88% of it on a discretionary basis, on its Form ADV filed July 15, 2026.

How many clients does Mainstay Capital Management, LLC have?

It reports 3,454 individual clients: 1,664 high-net-worth individuals and 1,790 other individuals. Individuals account for about 93% of its regulatory assets.

Where is Mainstay Capital Management, LLC headquartered?

Its main office is in Grand Blanc, Michigan. It reports 5 offices in total and 33 employees, 19 of whom perform investment advisory functions.

How does Mainstay Capital Management, LLC charge clients?

On Form ADV it lists these forms of compensation: a percentage of assets under management; fixed fees. Fees and minimums are set out in its Form ADV Part 2A brochure, available on the SEC’s adviser search.

What custodian does Mainstay Capital Management, LLC use?

It reports 2 custodians for its clients’ separately managed accounts: Charles Schwab and BNY Pershing. On Schedule D of its Form ADV filed July 15, 2026, it reports these amounts held: Charles Schwab ($2.8B); BNY Pershing ($14M). Form ADV lists only custodians holding 10% or more of separately managed account assets.

Is Mainstay Capital Management, LLC a hybrid RIA with a broker-dealer?

Mainstay Capital Management, LLC reports no employees registered with a broker-dealer and no affiliated broker-dealer.

Is Mainstay Capital Management, LLC a fiduciary?

As an SEC-registered investment adviser, Mainstay Capital Management, LLC owes its advisory clients a fiduciary duty under the Investment Advisers Act of 1940, which includes duties of care and loyalty. It reports no employees who are registered representatives of a broker-dealer.

Where these numbers come from

Every figure is Mainstay Capital Management, LLC’s own answer on its latest Form ADV, from the SEC’s registered-adviser list as of October 1, 2026: regulatory assets and accounts (Item 5.F), clients by type (5.D), employees (5.A and 5.B), compensation (5.E) and services (5.G). Custodians come from Schedule D 5.K(3) of its latest filing (2026-07-15), which lists those holding 10% or more of separately managed account assets and the amount at each. “Hybrid” means some employees are also registered representatives of a broker-dealer (Item 5.B(2)); affiliated broker-dealers are the related persons it lists in Item 7.A and Schedule D. Firm type comes from its own answers: broker-dealer firms are registered broker-dealers themselves (Item 6.A); private fund advisers manage mostly private funds (Item 7.B, 5.D); wealth managers manage at least half their assets for individuals (5.D). Its national rank compares it with every US-based independent wealth management RIA, the same field as The Largest RIAs. Figures are as of the firm’s last annual update, so they can lag recent deals and market moves. Regulatory AUM counts assets the firm continuously supervises and can differ from what a firm markets.

Not an endorsement or a recommendation. Before hiring any adviser, read its Form ADV Part 2A brochure and check its record on the SEC’s adviser search. How to check a financial advisor →