# Castleark Management LLC

> Castleark Management LLC is an SEC-registered investment advisory firm in Chicago, IL, registered since 1999, reporting $1 billion to $5 billion in regulatory assets under management in its Form ADV filing dated April 1, 2026.

- CRD: 109587
- Filed as: CASTLEARK MANAGEMENT LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Chicago, IL
- Filing period: October 2026
- Form ADV filing dated: April 1, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/109587
- AdvisorCensus page: https://advisorcensus.com/firm/castleark-management-llc-chicago-il-109587

## Quick answers

**How is Castleark Management LLC compensated?**
On its Form ADV (Item 5.E, October 2026), Castleark Management LLC reports these compensation arrangements: a percentage of assets under its management. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is Castleark Management LLC located?**
Castleark Management LLC's principal office is in Chicago, IL, according to its Form ADV.

**Is Castleark Management LLC registered with the SEC or a state?**
Castleark Management LLC is an SEC-registered investment advisory firm, registered since 1999. Status as filed: Approved. CRD 109587.

**How much does Castleark Management LLC manage?**
Castleark Management LLC reports $4,585,548,400 in regulatory assets under management in its Form ADV filing dated April 1, 2026 (100% discretionary).

**How have Castleark Management LLC's assets and staff changed since 2021?**
In the Form ADV data for Castleark Management LLC: Regulatory assets under management: $3,456,502,200 in the October 2021 data and $4,585,548,400 in the October 2026 data, up 33%. Total employees: 30 in October 2021 and 28 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Castleark Management LLC serve?**
By number of clients on Form ADV Item 5.D: high net worth individuals (46); state or municipal government entities (including government pension plans) (11); pooled investment vehicles (other than investment companies and business development companies) (5).

**Which custodians does Castleark Management LLC use?**
Castleark Management LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists BNY Mellon, Brown Brothers Harriman, Northern Trust and State Street as custodians holding 10% or more of its separately managed account assets.

**Does Castleark Management 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/109587

**What changed in Castleark Management LLC's recent Form ADV filings?**
In the May 2026 filing data: Regulatory assets under management went from $3,970,780,800 to $4,585,548,400 (+15%).

## From the Form ADV filing

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

### Custodians (Schedule D, Section 5.K(3))
- BNY Mellon
- Brown Brothers Harriman
- Northern Trust
- 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: $4,585,548,400
- Discretionary: $4,585,548,400
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| High net worth individuals | 46 | $76,815,000 |
| Investment companies | 1 | $311,716,000 |
| Pooled investment vehicles (other than investment companies and business development companies) | 5 | $362,411,000 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | 3 | $1,135,898,000 |
| State or municipal government entities (including government pension plans) | 11 | $2,698,708,400 |

### Advisory services (Item 5.G)
- Portfolio management for individuals and/or small businesses
- Portfolio management for investment companies (and business development companies)
- Portfolio management for pooled investment vehicles (other than investment companies)
- Portfolio management for businesses (other than small businesses) or institutional clients

### Firm details
- Registered since: 1999 (27 years)
- Employees: 28 total, 18 performing advisory functions
- Wrap fee program participation: Yes
- States registered or notice-filed: IL
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

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

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $3,456,502,200 | 30 | March 31, 2021 |
| October 2022 | $3,666,123,000 | 34 | April 5, 2022 |
| October 2023 | $2,782,446,000 | 29 | March 30, 2023 |
| October 2024 | $3,059,938,100 | 30 | March 30, 2024 |
| October 2025 | $3,970,780,800 | 28 | May 8, 2025 |
| October 2026 | $4,585,548,400 | 28 | April 1, 2026 |

Regulatory assets under management: $3,456,502,200 in the October 2021 data and $4,585,548,400 in the October 2026 data, up 33%.
Total employees: 30 in October 2021 and 28 in October 2026.

## Changes in the filing (last 12 months)

### May 2026
- Regulatory assets under management went from $3,970,780,800 to $4,585,548,400 (+15%).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Castleark Management LLC (CRD 109587): Form ADV filing data as of October 2026.