Firm profile

Winston Capital Management LLC

ARLINGTON, VACRD 111450Registration Status: ApprovedEffective since January 31, 1997SEC # 801-54022Latest ADV June 4, 2026

Winston Capital Management LLC is an SEC registered investment adviser organized as a limited liability company with a primary office location in Arlington, VA. Its latest Form ADV filing, dated June 4, 2026, reports $1.1B in regulatory assets under management, 9 employees, 1 office, and 9 accounts.

Assets Under Management
$1.1B
Employees
9
Offices
1 office
Total Clients
9

Associated firm names

1 name listed
  • WINSTON CAPITAL MANAGEMENT LLC

Leadership

3 roles identified
CCOWilliam O. Birchfield
CFOWilliam O. Birchfield
COOWilliam O. Birchfield

Advisory services offered

3 types reported
Portfolio management for businesses
Portfolio management for pooled investment vehicles
Selection of other advisers

Fee models offered

2 types reported
Asset based fees
Performance-based fees

Offices & Contact

Primary office

ARLINGTON, Virginia, 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.

Virginia

ARLINGTONPrimary 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$1.1Bas of June 4, 2026
Discretionary99.6%
$1.1B
100% of total RAUM99.6%
Non-discretionary0.4%
$4M
0% of total RAUM0.4%
Regulatory assets under management are split between discretionary and non-discretionary assets.

Client Coverage Demographics

Top client segmentPooled Investment Vehicles represent 88.9% of total clients.
Top client categories% of clientsClients
1
Pooled Investment Vehicles
88.9%
8
2
Insurance Cos.
11.1%
1

Assets under management Growth by Quarter

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

Total AUM$1.1B
Total Accounts9
10Y AUM Change$-68M (-5.6%)

Private Funds

Private funds reported by Winston Capital 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 Employees9
Clients per Employee1:1
10Y Employee Change-5 (-35.7%)

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%
WINSTON PARTNERS GROUP LLCDirect owner · Schedule AInterest in WINSTON CAPITAL MANAGEMENT LLC
75%+
MPB HOLDINGS, L.L.C.Indirect owner · Schedule BInterest in WINSTON PARTNERS GROUP LLC
25% to < 50%
MARVIN PIERCE BUSHIndirect owner · Schedule BInterest in MPB HOLDINGS, L.L.C.
25% to < 50%
JONATHAN DAVID SCANLONIndirect owner · Schedule BInterest in MPB HOLDINGS, L.L.C.
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 Winston Capital Management LLC.

Reported ownership and control details

Form ADV · Filing date 2026-06-04 · Schedules A and B

8 entries
#Owner / person & roleInterest in entityReported interestControl personTitle / status acquiredSource
1MARVIN PIERCE BUSHVICE-PRESIDENT/DIRECTORIndividualWINSTON CAPITAL MANAGEMENT LLCLess than 5%Code NAYesVICE-PRESIDENT/DIRECTOR01/1997Schedule APDF page 42
2WINSTON PARTNERS GROUP LLCSOLE MEMBERDomestic entityWINSTON CAPITAL MANAGEMENT LLC75% or moreCode EYesSOLE MEMBER01/1997Schedule APDF page 42
3JONATHAN DAVID SCANLONDIRECTOR/PRESIDENTIndividualWINSTON CAPITAL MANAGEMENT LLCLess than 5%Code NAYesDIRECTOR/PRESIDENT04/2002Schedule APDF page 42
4WILLIAM OTTO BIRCHFIELDCHIEF FINANCIAL OFFICER/CHIEF OPERATING OFFICER/CHIEF COMPLIANCE OFFICER/TREASURER/SECRETARY/DIRECTORIndividualWINSTON CAPITAL MANAGEMENT LLCLess than 5%Code NAYesCHIEF FINANCIAL OFFICER/CHIEF OPERATING OFFICER/CHIEF COMPLIANCE OFFICER/TREASURER/SECRETARY/DIRECTOR03/2010Schedule APDF page 42
5MPB HOLDINGS, L.L.C.MEMBER; CLASS ADomestic entityWINSTON PARTNERS GROUP LLC25% to less than 50%Code CYesMEMBER; CLASS A01/1997Schedule BPDF page 42
6MARVIN PIERCE BUSHMANAGERIndividualMPB HOLDINGS, L.L.C.25% to less than 50%Code CYesMANAGER09/1996Schedule BPDF page 42
7WILLIAM OTTO BIRCHFIELDSECRETARY AND TREASURERIndividualMPB HOLDINGS, L.L.C.Percentage not specifiedCode FYesSECRETARY AND TREASURER09/2009Schedule BPDF page 42
8JONATHAN DAVID SCANLONMANAGERIndividualMPB HOLDINGS, L.L.C.25% to less than 50%Code CYesMANAGER01/2022Schedule BPDF page 43

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 6/4/2026 5:10:15 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.