# Mariner

> Mariner is an SEC-registered investment advisory firm in Overland Park,, KS, registered since 2010, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated August 5, 2026.

- CRD: 151664
- Filed as: MARINER
- Legal name: Mariner Managed Account Solutions, LLC
- Also doing business as: MARINER
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Overland Park,, KS
- Filing period: October 2026
- Form ADV filing dated: August 5, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/151664
- AdvisorCensus page: https://advisorcensus.com/firm/mariner-overland-park-ks-151664

## Quick answers

**How is Mariner compensated?**
On its Form ADV (Item 5.E, October 2026), Mariner reports these compensation arrangements: a percentage of assets under its management. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is Mariner located?**
Mariner's principal office is in Overland Park,, KS, according to its Form ADV; the September 2026 filing also lists 1 other office (Schedule D, Section 1.F).

**Is Mariner registered with the SEC or a state?**
Mariner is an SEC-registered investment advisory firm, registered since 2010. Status as filed: Approved. CRD 151664.

**How much does Mariner manage?**
Mariner reports $2,770,128,298 in regulatory assets under management in its Form ADV filing dated August 5, 2026 (99% discretionary).

**How have Mariner's assets and staff changed since 2021?**
In the Form ADV data for Mariner: Regulatory assets under management: $1,299,443,460 in the October 2021 data and $2,770,128,298 in the October 2026 data, up 113%. Total employees: 6 in October 2021 and 13 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Mariner serve?**
By number of clients on Form ADV Item 5.D: individuals (other than high net worth individuals) (3,491); high net worth individuals (46).

**Which custodians does Mariner use?**
Mariner's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists National Financial Services LLC as a custodian holding 10% or more of its separately managed account assets.

**Does Mariner report any disciplinary disclosures?**
Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/151664

**What changed in Mariner's recent Form ADV filings?**
In the April 2026 filing data: Changed its legal name from Baystate Wealth Management LLC to Mariner Managed Account Solutions, LLC. Employees performing advisory functions went from 6 to 7. Regulatory assets under management went from $2,352,770,746 to $2,770,128,298 (+18%). Updated its list of owners and control persons (Schedule A).

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management

### Custodians (Schedule D, Section 5.K(3))
- National Financial Services LLC

Custodians holding 10% or more of the firm's separately managed account assets, as filed on Form ADV (Schedule D, Section 5.K(3)). A custodian holds client assets; it does not endorse or supervise the firm. AdvisorCensus has no relationship with any custodian.

### Regulatory assets under management (Item 5.F)
- Total: $2,770,128,298
- Discretionary: $2,735,036,176
- Non-discretionary: $35,092,122

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 3,491 | $2,346,345,504 |
| High net worth individuals | 46 | $423,782,794 |

### Advisory services (Item 5.G)
- Portfolio management for individuals and/or small businesses
- Portfolio management for businesses (other than small businesses) or institutional clients

### Firm details
- Registered since: 2010 (16 years)
- Employees: 13 total, 7 performing advisory functions
- Wrap fee program participation: Yes
- States registered or notice-filed: AK, AZ, CA, CT, DC, FL, GA, IL, KS, LA, MA, MD, ME, MI, MO, NC, NH, NJ, NM, NY, OH, OR, PA, RI, SC, TN, TX, UT, VA, VT, WA
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Other offices (Schedule D, Section 1.F), as of the September 2026 filing
- Boston, MA

### Websites listed on Form ADV (Item 1.I)
- mmas.mariner.com
- LinkedIn @access-mariner

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $1,299,443,460 | 6 | April 5, 2021 |
| October 2022 | $1,571,527,380 | 13 | June 18, 2022 |
| October 2023 | $1,504,797,634 | 11 | March 31, 2023 |
| October 2024 | $1,917,168,691 | 12 | April 5, 2024 |
| October 2025 | $2,352,770,746 | 12 | May 1, 2025 |
| October 2026 | $2,770,128,298 | 13 | August 5, 2026 |

Regulatory assets under management: $1,299,443,460 in the October 2021 data and $2,770,128,298 in the October 2026 data, up 113%.
Total employees: 6 in October 2021 and 13 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Changed its legal name from Baystate Wealth Management LLC to Mariner Managed Account Solutions, LLC.
- Employees performing advisory functions went from 6 to 7.
- Regulatory assets under management went from $2,352,770,746 to $2,770,128,298 (+18%).
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Mariner (CRD 151664): Form ADV filing data as of October 2026.