# Isthmus Partners, LLC

> Isthmus Partners, LLC is an SEC-registered investment advisory firm in Madison, WI, registered since 2014, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated January 23, 2026.

- CRD: 171279
- Filed as: ISTHMUS PARTNERS, LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Madison, WI
- Filing period: October 2026
- Form ADV filing dated: January 23, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/171279
- AdvisorCensus page: https://advisorcensus.com/firm/isthmus-partners-llc-madison-wi-171279

## Quick answers

**How is Isthmus Partners, LLC compensated?**
On its Form ADV (Item 5.E, October 2026), Isthmus Partners, LLC reports these compensation arrangements: a percentage of assets under its management; hourly charges; fixed fees (other than subscription fees).

**Where is Isthmus Partners, LLC located?**
Isthmus Partners, LLC's principal office is in Madison, WI, according to its Form ADV.

**Is Isthmus Partners, LLC registered with the SEC or a state?**
Isthmus Partners, LLC is an SEC-registered investment advisory firm, registered since 2014. Status as filed: Approved. CRD 171279.

**How much does Isthmus Partners, LLC manage?**
Isthmus Partners, LLC reports $1,438,537,516 in regulatory assets under management in its Form ADV filing dated January 23, 2026 (95% discretionary).

**How have Isthmus Partners, LLC's assets and staff changed since 2021?**
In the Form ADV data for Isthmus Partners, LLC: Regulatory assets under management: $779,624,047 in the October 2021 data and $1,438,537,516 in the October 2026 data, up 85%. Total employees: 14 in October 2021 and 17 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Isthmus Partners, LLC serve?**
By number of clients on Form ADV Item 5.D: high net worth individuals (208); individuals (other than high net worth individuals) (149); pension and profit sharing plans (but not the plan participants or government pension plans) (14).

**Which custodians does Isthmus Partners, LLC use?**
Isthmus Partners, LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists BMO Harris, Charles Schwab & Co., Inc., Godfrey & Kahn and State Street as custodians holding 10% or more of its separately managed account assets.

**Does Isthmus Partners, LLC 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/171279

**What changed in Isthmus Partners, LLC's recent Form ADV filings?**
In the February 2026 filing data: Regulatory assets under management went from $1,296,248,165 to $1,438,537,516 (+11%). 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
- Hourly charges
- Fixed fees (other than subscription fees)

### Custodians (Schedule D, Section 5.K(3))
- BMO Harris
- Charles Schwab & Co., Inc.
- Godfrey & Kahn
- State Street

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: $1,438,537,516
- Discretionary: $1,361,282,671
- Non-discretionary: $77,254,845

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 149 | $138,003,368 |
| High net worth individuals | 208 | $1,142,271,239 |
| Banking or thrift institutions | 0 | $0 |
| Investment companies | 0 | $0 |
| Business development companies | 0 | $0 |
| Pooled investment vehicles (other than investment companies and business development companies) | 0 | $0 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | 14 | $35,726,671 |
| Charitable organizations | 5 | $96,411,820 |
| State or municipal government entities (including government pension plans) | 0 | $0 |
| Other investment advisers | 0 | $0 |
| Insurance companies | 0 | $0 |
| Sovereign wealth funds and foreign official institutions | 0 | $0 |
| Corporations or other businesses not listed above | 5 | $26,124,418 |
| Other | 0 | $0 |

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

### Firm details
- Registered since: 2014 (12 years)
- Employees: 17 total, 8 performing advisory functions
- Wrap fee program participation: Yes
- States registered or notice-filed: AZ, CA, CO, FL, IL, MN, NC, TX, WI
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Websites listed on Form ADV (Item 1.I)
- isthmuspartnersllc.com
- LinkedIn linkedin.com
- LinkedIn @Alex-Barenklau
- LinkedIn @Laura-Richardson
- LinkedIn @Laura-Tzakis
- LinkedIn @brandoncloetemu
- LinkedIn @david-hackworthy-9b55844
- LinkedIn @eric-knudson-cfp-b85777147
- LinkedIn @jeremy-bair-cfs-11a7b613
- LinkedIn @joemcneil
- LinkedIn @josephedelstein
- LinkedIn @noel-d-goeddel-cfa-b4a8b7
- LinkedIn @rebecca-wiegand-55a96b93
- LinkedIn @ryan-cobb-6b32a032
- LinkedIn @sara-trachte-6b0b6621
- LinkedIn @victor-rodriguez-88035013

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $779,624,047 | 14 | March 19, 2021 |
| October 2022 | $952,505,865 | 15 | February 16, 2022 |
| October 2023 | $977,296,272 | 15 | September 14, 2023 |
| October 2024 | $1,108,775,286 | 16 | April 29, 2024 |
| October 2025 | $1,296,248,165 | 16 | July 11, 2025 |
| October 2026 | $1,438,537,516 | 17 | January 23, 2026 |

Regulatory assets under management: $779,624,047 in the October 2021 data and $1,438,537,516 in the October 2026 data, up 85%.
Total employees: 14 in October 2021 and 17 in October 2026.

## Changes in the filing (last 12 months)

### February 2026
- Regulatory assets under management went from $1,296,248,165 to $1,438,537,516 (+11%).
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Isthmus Partners, LLC (CRD 171279): Form ADV filing data as of October 2026.