# Third Harbor

> Third Harbor is an SEC-registered investment advisory firm in Cold Spring Harbor, NY, registered since 2026, with no regulatory assets under management reported in its Form ADV filing dated August 11, 2026.

- CRD: 343219
- Filed as: THIRD HARBOR
- Legal name: Third Harbor Partners L.P.
- Registration: SEC-registered investment adviser (status as filed: 120-Day Approval)
- Location: Cold Spring Harbor, NY
- Filing period: October 2026
- Form ADV filing dated: August 11, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/343219
- AdvisorCensus page: https://advisorcensus.com/firm/third-harbor-cold-spring-harbor-ny-343219

## Quick answers

**How is Third Harbor compensated?**
On its Form ADV (Item 5.E, October 2026), Third Harbor reports these compensation arrangements: a percentage of assets under its management; performance-based fees.

**Where is Third Harbor located?**
Third Harbor's principal office is in Cold Spring Harbor, NY, according to its Form ADV.

**Is Third Harbor registered with the SEC or a state?**
Third Harbor is an SEC-registered investment advisory firm, registered since 2026. Status as filed: 120-Day Approval. CRD 343219.

**Does Third Harbor 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/343219

**What changed in Third Harbor's recent Form ADV filings?**
In the September 2026 filing data: Changed its legal name from Third Harbor Management L.P. to Third Harbor Partners L.P..

## From the Form ADV filing

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

### Advisory services (Item 5.G)
- Portfolio management for pooled investment vehicles (other than investment companies)

### Firm details
- Registered since: 2026 (0 years)
- Employees: 3 total, 3 performing advisory functions
- Wrap fee program participation: No
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

## Changes in the filing (last 12 months)

### September 2026
- Changed its legal name from Third Harbor Management L.P. to Third Harbor Partners L.P..

### August 2026
- Newly registered with the SEC.

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Third Harbor (CRD 343219): Form ADV filing data as of October 2026.