Firm profile

Gw&K Investment Management, LLC

BOSTON, MACRD 121942Registration Status: ApprovedEffective since November 18, 2002SEC # 801-61559Latest ADV March 26, 2026

Gw&K Investment Management, LLC is an SEC registered investment adviser organized as a limited liability company with a primary office location in Boston, MA. Its latest Form ADV filing, dated March 26, 2026, reports $52.8B in regulatory assets under management, 177 employees, 1 office, and 48,710 accounts.

Assets Under Management
$52.8B
Employees
177
Offices
1 office
Total Clients
48,710

Associated firm names

3 names listed
  • GANNETT WELSH & KOTLER INC.
  • GW&K INVESTMENT MANAGEMENT, LLC
  • GANNETT WELSH & KOTLER, LLC

Leadership

3 roles identified
CEOThomas F. X. Powers
CCODavid J. Rouse
CFOBrian T. Maguire

Advisory services offered

6 types reported
Financial Planning Services
Portfolio management for businesses
Portfolio management for individuals and small businesses

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
Phone617-236-8900
WebsiteNot found
LinkedInNot found

Regulatory Assets Under Management Breakdown

Total regulatory assets under management$52.8Bas of March 26, 2026
Discretionary100.0%
$52.8B
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 segmentHNWI represent 98.0% of total clients.
Top client categories% of clientsClients
1
HNWI
98.0%
47,749
2
Corporations
1.6%
776
3
Pension Plans
0.3%
123
Additional categories (<0.1%)
Banks17 clients
Investment Cos.17 clients
Pooled Investment Vehicles14 clients
Government13 clients
Sovereign Wealth<5 clients
Categories with <5 clients
Sovereign wealth funds and foreign official 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$52.8B
Total Accounts48,710
10Y AUM Change+$20.6B (+64.0%)

Private Funds

Private funds reported by Gw&K Investment Management, 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 Employees177
Clients per Employee275:1
10Y Employee Change+60 (+51.3%)

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%
AMG BOSTON HOLDINGS, LLCDirect owner · Schedule AInterest in GW&K INVESTMENT MANAGEMENT, LLC
50% to < 75%
THOMAS F X POWERSDirect owner · Schedule AInterest in GW&K INVESTMENT MANAGEMENT, LLC
5% to < 10%
AMG GWK HOLDINGS, LLCIndirect owner · Schedule BInterest in AMG BOSTON HOLDINGS, LLC
75%+
AFFILIATED MANAGERS GROUP, INC.Indirect owner · Schedule BInterest in AMG GWK HOLDINGS, LLC
75%+

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 Gw&K Investment Management, LLC.

Reported ownership and control details

Form ADV · Filing date 2026-03-26 · Schedules A and B

8 entries
#Owner / person & roleInterest in entityReported interestControl personTitle / status acquiredSource
1HAROLD GILBERT KOTLERFOUNDER- CHAIRMANIndividualGW&K INVESTMENT MANAGEMENT, LLCLess than 5%Code NAYesFOUNDER- CHAIRMAN06/2022Schedule APDF page 51
2THOMAS F X POWERSCHIEF EXECUTIVE OFFICERIndividualGW&K INVESTMENT MANAGEMENT, LLC5% to less than 10%Code AYesCHIEF EXECUTIVE OFFICER06/2022Schedule APDF page 51
3AMG BOSTON HOLDINGS, LLCMANAGER MEMBERDomestic entityGW&K INVESTMENT MANAGEMENT, LLC50% to less than 75%Code DNoMANAGER MEMBER10/2008Schedule APDF page 51
4DAVID JOHN ROUSECHIEF COMPLIANCE OFFICERIndividualGW&K INVESTMENT MANAGEMENT, LLCLess than 5%Code NANoCHIEF COMPLIANCE OFFICER03/2021Schedule APDF page 51
5BRIAN TIMOTHY MAGUIRECHIEF FINANCIAL OFFICERIndividualGW&K INVESTMENT MANAGEMENT, LLCLess than 5%Code NANoCHIEF FINANCIAL OFFICER01/2025Schedule APDF page 51
6MICHAEL JASON CLAREPRESIDENTIndividualGW&K INVESTMENT MANAGEMENT, LLCLess than 5%Code NAYesPRESIDENT03/2026Schedule APDF page 51
7AMG GWK HOLDINGS, LLCMANAGER AND SERIES A MEMBERDomestic entityAMG BOSTON HOLDINGS, LLC75% or moreCode EYesMANAGER AND SERIES A MEMBER09/2014Schedule BPDF page 52
8AFFILIATED MANAGERS GROUP, INC.MANAGER AND SOLE MEMBERDomestic entityAMG GWK HOLDINGS, LLC75% or moreCode EYesMANAGER AND SOLE MEMBER06/2014Schedule BPDF page 52

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 3/26/2026 4:28:38 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.