Firm profile

Longfellow Investment Management Co.. LLC

BOSTON, MACRD 104945Registration Status: ApprovedEffective since July 21, 1986SEC # 801-27485Latest ADV August 6, 2026

Longfellow Investment Management Co. LLC is an SEC registered investment adviser organized as a limited liability company with a primary office location in Boston, MA.

Assets Under Management
$23.4B
Employees
51
Offices
1 office
Total Clients
161

Associated firm names

2 names listed
  • LONGFELLOW INVESTMENT MANAGEMENT CO LTD PARTN
  • LONGFELLOW INVESTMENT MANAGEMENT CO. LLC

Leadership

1 roles identified
CCONicole M. Tremblay

Advisory services offered

3 types reported
Portfolio management for businesses
Portfolio management for individuals and small businesses
Portfolio management for pooled investment vehicles

Fee models offered

3 types reported
Asset based fees
Fixed fees
Performance-based fees

Offices & Contact

Primary office

BOSTON, Massachusetts, United States

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Primary office regionOther reported regions

Shading shows states and countries with reported offices. Cities are listed below; shading does not indicate service coverage.

Massachusetts

BOSTONPrimary office

1 office records listed · 1 total offices reported. Counts can use different reporting dates. SEC filers may list only their largest 25 additional offices.

Contact and digital presence

ADV profile links

Regulatory Assets Under Management Breakdown

Total regulatory assets under management$23.4Bas of August 6, 2026
Discretionary100.0%
$23.4B
100% of total RAUM100.0%
Non-discretionary0.0%
$0
0% of total RAUM0.0%
All regulatory assets under management are discretionary.

Client Coverage Demographics

Top client segmentCharitable represent 26.7% of total clients.
Top client categories% of clientsClients
1
Charitable
26.7%
43
2
Corporations
21.7%
35
3
Government
14.9%
24
4
Pension Plans
14.3%
23
5
Insurance Cos.
11.2%
18
Categories with <5 clients
Banking or thrift institutions<5 clients

Assets under management Growth by Quarter

Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.

Total AUM$23.4B
Total Accounts192
10Y AUM Change+$14.2B (+155.0%)

Private Funds

Private funds reported by Longfellow Investment Management Co.. LLC

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Employee Growth by Quarter

Quarterly points use the latest ADV filing or SEC roster snapshot available in each quarter.

Total Employees51
Clients per Employee3:1
10Y Employee Change+23 (+82.1%)

Historical AUM and employee figures reflect available SEC Form ADV filings under this CRD. Filing gaps may reflect registration status changes, dormant periods, state registration periods, firm restructuring, or other reporting changes. Rialytix does not interpolate missing periods.


Ownership

Reported direct and indirect ownership ranges

Each range applies to a separate reported relationship and should not be added together.

Reported ownership ranges

Highlighted bands show the percentage range reported in Form ADV.

0%25%50%75%100%
BARBARA JEANNE MCKENNADirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
25% to < 50%
ANUJA BATRADirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
10% to < 25%
IM SQUARE HOLDING 12 LLCDirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
10% to < 25%
MICHELLE LYNN MARTINDirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
5% to < 10%
Akshay AnandDirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
5% to < 10%
DAVID CHARLES STUEHRDirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
< 5%
MARY CORINNE LARSONDirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
< 5%
NICOLE MARIE TREMBLAYDirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
< 5%
Meagen Patricia SweeneyDirect owner · Schedule AInterest in LONGFELLOW INVESTMENT MANAGEMENT CO. LLC
< 5%
IM SQUARE PARTNERS HOLDINGIndirect owner · Schedule BInterest in IM SQUARE HOLDING 12 LLC
75%+
IM SQUARE SASIndirect owner · Schedule BInterest in IM SQUARE PARTNERS HOLDING
75%+
EURAZEO SEIndirect owner · Schedule BInterest in LEGENDRE HOLDING 36
75%+
LEGENDRE HOLDING 36Indirect owner · Schedule BInterest in IM SQUARE SAS
50% to < 75%
JC DECAUX HOLDINGS SASIndirect owner · Schedule BInterest in EURAZEO SE
25% to < 50%

Bars represent the reported range at that individual ownership step, not an estimated percentage of the advisory firm. Indirect relationships may refer to intermediate entities rather than directly to Longfellow Investment Management Co.. LLC.

Reported ownership and control details

Form ADV · Filing date 2026-08-06 · Schedules A and B

15 entries
#Owner / person & roleInterest in entityReported interestControl personTitle / status acquiredSource
1BARBARA JEANNE MCKENNAPRESIDENT, MANAGING MEMBERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLC25% to less than 50%Code CYesPRESIDENT, MANAGING MEMBER04/2009Schedule APDF page 21
2MICHELLE LYNN MARTINCHIEF ADMINISTRATIVE OFFICER, MEMBERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLC5% to less than 10%Code ANoCHIEF ADMINISTRATIVE OFFICER, MEMBER11/2021Schedule APDF page 21
3DAVID CHARLES STUEHRMANAGING MEMBERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLCLess than 5%Code NAYesMANAGING MEMBER10/2021Schedule APDF page 21
4Akshay AnandMEMBERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLC5% to less than 10%Code ANoMEMBER04/2018Schedule APDF page 21
5ANUJA BATRAMANAGING MEMBER, TREASURERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLC10% to less than 25%Code BYesMANAGING MEMBER, TREASURER04/2018Schedule APDF page 21
6GEORGE WEBB NOYESELECTED MANAGERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLCLess than 5%Code NAYesELECTED MANAGER04/2018Schedule APDF page 21
7MARY CORINNE LARSONMANAGING MEMBERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLCLess than 5%Code NAYesMANAGING MEMBER09/2021Schedule APDF page 21
8NICOLE MARIE TREMBLAYCHIEF COMPLIANCE OFFICER, GENERAL COUNSEL, MANAGING MEMBERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLCLess than 5%Code NAYesCHIEF COMPLIANCE OFFICER, GENERAL COUNSEL, MANAGING MEMBER04/2024Schedule APDF page 21
9Meagen Patricia SweeneyDIRECTOR, OPERATIONS AND INFRASTRUCTURE, MEMBERIndividualLONGFELLOW INVESTMENT MANAGEMENT CO. LLCLess than 5%Code NAYesDIRECTOR, OPERATIONS AND INFRASTRUCTURE, MEMBER01/2026Schedule APDF page 21
10IM SQUARE HOLDING 12 LLCMEMBERDomestic entityLONGFELLOW INVESTMENT MANAGEMENT CO. LLC10% to less than 25%Code BNoMEMBER07/2026Schedule APDF page 21
11IM SQUARE PARTNERS HOLDINGHOLDING COMPANYForeign entityIM SQUARE HOLDING 12 LLC75% or moreCode EYesHOLDING COMPANY03/2026Schedule BPDF page 21
12IM SQUARE SASPARENTForeign entityIM SQUARE PARTNERS HOLDING75% or moreCode EYesPARENT12/2020Schedule BPDF page 21
13LEGENDRE HOLDING 36HOLDING COMPANYForeign entityIM SQUARE SAS50% to less than 75%Code DYesHOLDING COMPANY06/2015Schedule BPDF page 21
14EURAZEO SEPARENTForeign entityLEGENDRE HOLDING 3675% or moreCode EYesPARENT06/2014Schedule BPDF page 21
15JC DECAUX HOLDINGS SASSHAREHOLDERForeign entityEURAZEO SE25% to less than 50%Code CYesSHAREHOLDER01/2022Schedule BPDF page 21

Less than 5% may include zero. Code F identifies a role without specifying a percentage. Reported interests may overlap and may not include every owner. Total indirect ownership is not calculated.

Compliance & Disclosures

Filing dated 8/6/2026 3:34:41 PM

Responses were selected by the RIA in its filing. Questions are shortened for readability; “you” refers to the reporting firm, and some questions also cover advisory affiliates.

RIA or supervised-person involvementThe RIA reported that none of the events below involve the firm or its supervised persons.RIA responseNo
AFelonies2 No

In the past ten years, have you or any advisory affiliate:

  • A1Been convicted of or pleaded guilty or no contest to a felony?No
  • A2Been charged with a felony?No
BMisdemeanors2 No

In the past ten years, have you or any advisory affiliate:

  • B1Been convicted of or pleaded guilty or no contest to a misdemeanor involving investments, an investment-related business, fraud, false statements or omissions, wrongful taking of property, bribery, perjury, forgery, counterfeiting, or extortion?No
  • B2Been charged with a misdemeanor of the kind listed above?No
CSEC or CFTC actions5 No

Has the SEC or CFTC ever:

  • C1Found you or an advisory affiliate made a false statement or omission?No
  • C2Found you or an advisory affiliate violated SEC or CFTC regulations or statutes?No
  • C3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • C4Entered an order against you or an advisory affiliate in connection with investment-related activity?No
  • C5Imposed a civil money penalty on you or an advisory affiliate, or ordered you or an advisory affiliate to cease and desist from any activity?No
DOther regulatory actions5 No

Has any other federal regulatory agency, state regulatory agency, or foreign financial regulatory authority ever:

  • D1Found you or an advisory affiliate made a false statement or omission, or was dishonest, unfair, or unethical?No
  • D2Found you or an advisory affiliate violated investment-related regulations or statutes?No
  • D3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • D4In the past ten years, entered an order against you or an advisory affiliate in connection with investment-related activity?No
  • D5Denied, suspended, or revoked your or an advisory affiliate’s registration or license, or otherwise prevented association with an investment-related business or restricted activities?No
ESelf-regulatory organization actions4 No

Has a self-regulatory organization or commodities exchange ever:

  • E1Found you or an advisory affiliate made a false statement or omission?No
  • E2Found you or an advisory affiliate violated its rules, other than a violation designated as a minor rule violation under an SEC-approved plan?No
  • E3Found you or an advisory affiliate caused an investment-related business to have its authorization to do business denied, suspended, revoked, or restricted?No
  • E4Disciplined you or an advisory affiliate by expulsion, suspension, barring association with other members, or otherwise restricting activities?No
FProfessional authorizations1 No
  • FHas an authorization to act as an attorney, accountant, or federal contractor granted to you or an advisory affiliate ever been revoked or suspended?No
GPending regulatory proceedings1 No
  • GAre you or any advisory affiliate now the subject of a regulatory proceeding that could result in a “Yes” answer to any part of C, D, or E?No
HCivil judicial actions and proceedings4 No

(1) Court actions

Has a domestic or foreign court:

  • H(1)(a)In the past ten years, enjoined you or an advisory affiliate in connection with investment-related activity?No
  • H(1)(b)Found that you or an advisory affiliate violated investment-related statutes or regulations?No
  • H(1)(c)Dismissed, pursuant to a settlement agreement, an investment-related civil action brought against you or an advisory affiliate by a state or foreign financial regulatory authority?No

(2) Pending civil proceedings

  • H(2)Are you or any advisory affiliate now the subject of a civil proceeding that could result in a “Yes” answer to any part of H(1)?No

* Metrics are based on the latest available data, including Form ADV filings, brochures, and relationship summaries pulled from the SEC IAPD, and may be subject to change. Learn what is included in the Rialytix data. Please refer to the firm's official disclosures for the most accurate information using their CRD number. This is not investment advice.