# 13D Management LLC

> 13D Management LLC is an SEC-registered investment advisory firm in New York, NY, registered since 2024, reporting $25 million to $100 million in regulatory assets under management in its Form ADV filing dated March 25, 2026.

- CRD: 154009
- Filed as: 13D MANAGEMENT LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: New York, NY
- Filing period: October 2026
- Form ADV filing dated: March 25, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/154009
- AdvisorCensus page: https://advisorcensus.com/firm/13d-management-llc-new-york-ny-154009

## Quick answers

**How is 13D Management LLC compensated?**
On its Form ADV (Item 5.E, October 2026), 13D Management LLC reports these compensation arrangements: a percentage of assets under its management; performance-based fees. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is 13D Management LLC located?**
13D Management LLC's principal office is in New York, NY, according to its Form ADV.

**Is 13D Management LLC registered with the SEC or a state?**
13D Management LLC is an SEC-registered investment advisory firm, registered since 2024. Status as filed: Approved. CRD 154009.

**How much does 13D Management LLC manage?**
13D Management LLC reports $99,422,046 in regulatory assets under management in its Form ADV filing dated March 25, 2026 (100% discretionary).

**How have 13D Management LLC's assets and staff changed since 2021?**
In the Form ADV data for 13D Management LLC: Regulatory assets under management: $254,440,554 in the October 2021 data and $99,422,046 in the October 2026 data, down 61%. Total employees: 8 in October 2021 and 8 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does 13D Management LLC serve?**
By number of clients on Form ADV Item 5.D: investment companies (1).

**Does 13D 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/154009

**What changed in 13D Management LLC's recent Form ADV filings?**
In the April 2026 filing data: Employees performing advisory functions went from 5 to 6. Regulatory assets under management went from $138,827,340 to $99,422,046 (-28%).

## 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: $99,422,046
- Discretionary: $99,422,046
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Investment companies | 1 | $99,422,046 |

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

### Firm details
- Registered since: 2024 (2 years)
- Employees: 8 total, 6 performing advisory functions
- Wrap fee program participation: No
- States registered or notice-filed: NY
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Websites listed on Form ADV (Item 1.I)
- 13dactivistfund.com
- 13dmanagement.com
- LinkedIn @13d-management

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $254,440,554 | 8 | March 31, 2021 |
| October 2022 | $280,818,767 | 7 | August 25, 2022 |
| October 2023 | $200,962,446 | 9 | May 3, 2023 |
| October 2024 | $176,029,176 | 9 | July 11, 2024 |
| October 2025 | $138,827,340 | 9 | March 31, 2025 |
| October 2026 | $99,422,046 | 8 | March 25, 2026 |

Regulatory assets under management: $254,440,554 in the October 2021 data and $99,422,046 in the October 2026 data, down 61%.
Total employees: 8 in October 2021 and 8 in October 2026.

## Changes in the filing (last 12 months)

### April 2026
- Employees performing advisory functions went from 5 to 6.
- Regulatory assets under management went from $138,827,340 to $99,422,046 (-28%).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. 13D Management LLC (CRD 154009): Form ADV filing data as of October 2026.