# Sunstone Partners

> Sunstone Partners is an SEC-registered investment advisory firm in San Mateo, CA, registered since 2019, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated July 2, 2026.

- CRD: 305064
- Filed as: SUNSTONE PARTNERS
- Legal name: Sunstone Partners Management, LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: San Mateo, CA
- Filing period: October 2026
- Form ADV filing dated: July 2, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/305064
- AdvisorCensus page: https://advisorcensus.com/firm/sunstone-partners-san-mateo-ca-305064

## Quick answers

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

**Where is Sunstone Partners located?**
Sunstone Partners' principal office is in San Mateo, CA, according to its Form ADV.

**Is Sunstone Partners registered with the SEC or a state?**
Sunstone Partners is an SEC-registered investment advisory firm, registered since 2019. Status as filed: Approved. CRD 305064.

**How much does Sunstone Partners manage?**
Sunstone Partners reports $1,586,963,155 in regulatory assets under management in its Form ADV filing dated July 2, 2026 (100% discretionary).

**How have Sunstone Partners' assets and staff changed since 2021?**
In the Form ADV data for Sunstone Partners: Regulatory assets under management: $923,340,249 in the October 2021 data and $1,586,963,155 in the October 2026 data, up 72%. Total employees: 27 in October 2021 and 39 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Sunstone Partners serve?**
By number of clients on Form ADV Item 5.D: pooled investment vehicles (other than investment companies and business development companies) (8).

**Does Sunstone 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/305064

**What changed in Sunstone Partners' recent Form ADV filings?**
In the April 2026 filing data: Regulatory assets under management went from $1,988,367,621 to $1,586,963,155 (-20%).

## 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: $1,586,963,155
- Discretionary: $1,586,963,155
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Pooled investment vehicles (other than investment companies and business development companies) | 8 | $1,586,963,155 |

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

### Firm details
- Registered since: 2019 (7 years)
- Employees: 39 total, 24 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: CA
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Websites listed on Form ADV (Item 1.I)
- sunstonepartners.com

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $923,340,249 | 27 | July 20, 2021 |
| October 2022 | $1,257,635,615 | 32 | March 29, 2022 |
| October 2023 | $2,109,620,176 | 38 | April 12, 2023 |
| October 2024 | $2,155,315,048 | 37 | April 30, 2024 |
| October 2025 | $1,988,367,621 | 37 | March 28, 2025 |
| October 2026 | $1,586,963,155 | 39 | July 2, 2026 |

Regulatory assets under management: $923,340,249 in the October 2021 data and $1,586,963,155 in the October 2026 data, up 72%.
Total employees: 27 in October 2021 and 39 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Regulatory assets under management went from $1,988,367,621 to $1,586,963,155 (-20%).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Sunstone Partners (CRD 305064): Form ADV filing data as of October 2026.