# Longfellow Investment Management Co. LLC

> Longfellow Investment Management Co. LLC is an SEC-registered investment advisory firm in Boston, MA, registered since 1986, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated August 6, 2026.

- CRD: 104945
- Filed as: LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Boston, MA
- Filing period: October 2026
- Form ADV filing dated: August 6, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/104945
- AdvisorCensus page: https://advisorcensus.com/firm/longfellow-investment-management-co-llc-boston-ma-104945

## Quick answers

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

**Where is Longfellow Investment Management Co. LLC located?**
Longfellow Investment Management Co. LLC's principal office is in Boston, MA, according to its Form ADV.

**Is Longfellow Investment Management Co. LLC registered with the SEC or a state?**
Longfellow Investment Management Co. LLC is an SEC-registered investment advisory firm, registered since 1986. Status as filed: Approved. CRD 104945.

**How much does Longfellow Investment Management Co. LLC manage?**
Longfellow Investment Management Co. LLC reports $23,442,074,430 in regulatory assets under management in its Form ADV filing dated August 6, 2026 (100% discretionary).

**How have Longfellow Investment Management Co. LLC's assets and staff changed since 2021?**
In the Form ADV data for Longfellow Investment Management Co. LLC: Regulatory assets under management: $14,710,396,576 in the October 2021 data and $23,442,074,430 in the October 2026 data, up 59%. Total employees: 47 in October 2021 and 51 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Longfellow Investment Management Co. LLC serve?**
By number of clients on Form ADV Item 5.D: charitable organizations (43); corporations or other businesses not listed above (35); state or municipal government entities (including government pension plans) (24).

**Which custodians does Longfellow Investment Management Co. LLC use?**
Longfellow Investment Management Co. LLC's most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Northern Trust Corporation, State Street Bank and Trust Company and The Bank of New York Mellon Corporation as custodians holding 10% or more of its separately managed account assets.

**Does Longfellow Investment Management Co. 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/104945

**What changed in Longfellow Investment Management Co. LLC's recent Form ADV filings?**
In the September 2026 filing data: 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
- Fixed fees (other than subscription fees)
- Performance-based fees

### Custodians (Schedule D, Section 5.K(3))
- Northern Trust Corporation
- State Street Bank and Trust Company
- The Bank of New York Mellon Corporation

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: $23,442,074,430
- Discretionary: $23,442,074,430
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 0 | $0 |
| High net worth individuals | 15 | $240,340,475 |
| Banking or thrift institutions | 1 | $327,014,935 |
| Investment companies | 1 | $100,372,686 |
| Business development companies | 0 | $0 |
| Pooled investment vehicles (other than investment companies and business development companies) | 1 | $3,591,514 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | 23 | $7,238,200,407 |
| Charitable organizations | 43 | $3,312,814,219 |
| State or municipal government entities (including government pension plans) | 24 | $6,102,424,390 |
| Other investment advisers | 0 | $0 |
| Insurance companies | 18 | $1,016,070,029 |
| Sovereign wealth funds and foreign official institutions | 0 | $0 |
| Corporations or other businesses not listed above | 35 | $5,101,245,775 |
| Other | 0 | $0 |

### Advisory services (Item 5.G)
- Portfolio management for individuals and/or small businesses
- 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: 1986 (40 years)
- Employees: 51 total, 24 performing advisory functions
- Wrap fee program participation: Yes
- States registered or notice-filed: CA, CT, FL, LA, MA, MI, NY, PA, TX
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

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

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $14,710,396,576 | 47 | March 30, 2021 |
| October 2022 | $18,128,008,950 | 54 | September 16, 2022 |
| October 2023 | $16,792,077,162 | 51 | March 20, 2023 |
| October 2024 | $17,000,577,298 | 56 | April 10, 2024 |
| October 2025 | $18,925,792,512 | 55 | July 2, 2025 |
| October 2026 | $23,442,074,430 | 51 | August 6, 2026 |

Regulatory assets under management: $14,710,396,576 in the October 2021 data and $23,442,074,430 in the October 2026 data, up 59%.
Total employees: 47 in October 2021 and 51 in October 2026.

## Changes in the filing (last 12 months)

### September 2026
- Updated its list of owners and control persons (Schedule A).

### April 2026
- Regulatory assets under management went from $18,925,792,512 to $23,442,074,430 (+24%).
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Longfellow Investment Management Co. LLC (CRD 104945): Form ADV filing data as of October 2026.