# Great Mountain Partners

> Great Mountain Partners is an SEC-registered investment advisory firm in New Haven, CT, registered since 2020, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated March 27, 2026.

- CRD: 309528
- Filed as: GREAT MOUNTAIN PARTNERS
- Legal name: Great Mountain Partners LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: New Haven, CT
- Filing period: October 2026
- Form ADV filing dated: March 27, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/309528
- AdvisorCensus page: https://advisorcensus.com/firm/great-mountain-partners-new-haven-ct-309528

## Quick answers

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

**Where is Great Mountain Partners located?**
Great Mountain Partners' principal office is in New Haven, CT, according to its Form ADV; the April 2026 filing also lists 1 other office (Schedule D, Section 1.F).

**Is Great Mountain Partners registered with the SEC or a state?**
Great Mountain Partners is an SEC-registered investment advisory firm, registered since 2020. Status as filed: Approved. CRD 309528.

**How much does Great Mountain Partners manage?**
Great Mountain Partners reports $14,107,025,927 in regulatory assets under management in its Form ADV filing dated March 27, 2026 (100% discretionary).

**How have Great Mountain Partners' assets and staff changed since 2021?**
In the Form ADV data for Great Mountain Partners: Regulatory assets under management: $5,164,875,548 in the October 2021 data and $14,107,025,927 in the October 2026 data, up 173%. Total employees: 5 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 Great Mountain Partners serve?**
By number of clients on Form ADV Item 5.D: pooled investment vehicles (other than investment companies and business development companies) (11).

**Does Great Mountain Partners 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/309528

**What changed in Great Mountain Partners' recent Form ADV filings?**
In the April 2026 filing data: Regulatory assets under management went from $11,315,145,744 to $14,107,025,927 (+25%). 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
- Performance-based fees

### Regulatory assets under management (Item 5.F)
- Total: $14,107,025,927
- Discretionary: $14,107,025,927
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Pooled investment vehicles (other than investment companies and business development companies) | 11 | $14,107,025,927 |

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

### Firm details
- Registered since: 2020 (5 years)
- Employees: 17 total, 10 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: CT
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Other offices (Schedule D, Section 1.F), as of the April 2026 filing
- East Lansing, MI

### Websites listed on Form ADV (Item 1.I)
- gmp.llc
- LinkedIn @great-mountain-partners

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $5,164,875,548 | 5 | July 23, 2021 |
| October 2022 | $5,400,624,992 | 7 | June 8, 2022 |
| October 2023 | $8,881,116,442 | 11 | July 13, 2023 |
| October 2024 | $10,592,680,510 | 15 | May 20, 2024 |
| October 2025 | $11,315,145,744 | 17 | June 2, 2025 |
| October 2026 | $14,107,025,927 | 17 | March 27, 2026 |

Regulatory assets under management: $5,164,875,548 in the October 2021 data and $14,107,025,927 in the October 2026 data, up 173%.
Total employees: 5 in October 2021 and 17 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Regulatory assets under management went from $11,315,145,744 to $14,107,025,927 (+25%).
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Great Mountain Partners (CRD 309528): Form ADV filing data as of October 2026.