South Dakota · Public trust company

Mariner Trust Company, LLC

Also used as MTC.

Charter / domicile: South DakotaPublic trust company (TC.2)TC.084-2
Regulator: South Dakota Division of Banking
Public / private: PrivateAffiliate of Mariner Wealth Advisors. Mariner legal pages describe Mariner Trust Company, LLC as a South Dakota state-chartered public trust company that provides administrative trust services and other related services. Not an independent directed boutique.Parent: Mariner Wealth Advisors
Directed-trust focus: Directed / mixedAffiliate disclosures describe MTC as providing administrative trust services. Mariner’s public trust-services page is a wealth-platform trust offering that names MTC as the South Dakota charter. That is directed / mixed — administrative trustee language inside a platform affiliate, not a pure directed shop.
Headquarters: 6320 S. Western Ave., Ste. 100, Sioux Falls, SD 57108
Founded / charter: Charter year 2013 (2013-11-12)
Published AUM / AUA: Not published — omitted
Website: www.marinerwealthadvisors.com

Services offered

Administrative trust services (as disclosed for MTC)
Related fiduciary services as described by Mariner affiliate disclosures

Who it is for

Mariner wealth clients who need a South Dakota administrative trustee
Families whose wealth advisor is already on the Mariner platform

Sourced facts

Appears on the South Dakota Division of Banking September 2026 roster as Mariner Trust Company, LLC, credential TC.084-2 (public TC.2), first issuance 12 November 2013, at 6320 S. Western Ave., Ste. 100, Sioux Falls, SD 57108.
The Division’s Annual Activity Report for 2024 records approval on 22 October 2024 of Mariner Trust Company, LLC’s application to relocate from 212 S. Main Ave., Suite 125, Sioux Falls, to the Western Avenue address.
Mariner’s Trust Management Services page states that trust services are provided by Mariner Trust Company (MTC), an affiliate of Mariner, a state-chartered public trust company organized under South Dakota law, serving customers with administrative trust services and other related services.
Mariner Independent’s legal page repeats that MTC is a state-chartered public trust company organized under the laws of South Dakota and provides administrative trust services and other related services.

Notes

Mariner Trust Company, LLC is on the South Dakota Division of Banking September 2026 roster as a public trust company (TC.084-2), first issued 12 November 2013, at 6320 S. Western Ave., Ste. 100, Sioux Falls. The Division’s 2024 annual activity report approved that relocation from 212 S. Main Ave. on 22 October 2024.

Mariner’s own pages name MTC as the South Dakota charter that provides administrative trust services. That is an affiliate trustee for a large RIA platform, not a product-free directed boutique. Confirm who signs and whether investment direction can sit outside Mariner. This page does not invent fees or AUM.

What to verify next

Confirm credential TC.084-2 and the Western Avenue office on the appointment. This is a Mariner-platform administrative trustee — write the affiliation into the file and ask whether a non-Mariner advisor can direct investments on equal terms. The public site does not publish a standalone directed-versus-discretionary statute explainer; get the role in the instrument. Ask for a current fee schedule; do not invent fees. Omit AUM.

Sources

Trust Companies Chartered to Do Business in South Dakota
South Dakota Division of Banking · dated as of September 2026 · accessed 2026-09-09
Annual Activity Report for 2024
South Dakota Division of Banking · dated approved 2024-10-22 · accessed 2026-09-09
Trust Management Services
Mariner Wealth Advisors · accessed 2026-09-09
Legal / Disclosure Information
Mariner Independent · accessed 2026-09-09

Last reviewed 2026-09-09.

State file: South Dakota trust companies · South Dakota directed trustees · Other South Dakota listings