Winthrop Advisory Group, Llc
SEC-registered
Wealth Manager · Mid-sized ($1B–$10B)
CRD 288178
· SEC file 801-110461
· Boston, MA
· www.youtube.com
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ADV data as of Jun 16, 2026
- Regulatory AUM
- $3.1B
- Discretionary
- $3.1B
- Clients
- 2,481
- Avg AUM / client
- $1.3M
- Accounts
- 4,369
- Employees
- 40
AUM over time
$0
$3.1B
Dec 2016
Jun 2026
Annual snapshots from Form ADV filings · as of Jun 16, 2026
Who they serve
| Client type | Clients | AUM | % of AUM |
|---|---|---|---|
| Individuals (non-high net worth) | 1,662 | $440M | 14.2% |
| High net worth individuals | 743 | $2.5B | 80.4% |
| Banking or thrift institutions | 0 | $0 | — |
| Pension and profit sharing plans | 20 | $51.5M | 1.66% |
| Charitable organizations | 19 | $23.9M | 0.77% |
| State or municipal government entities | 0 | $0 | — |
| Other investment advisers | 0 | $0 | — |
| Insurance companies | 0 | $0 | — |
| Sovereign wealth funds and foreign official institutions | 0 | $0 | — |
| Corporations and other businesses | 37 | $91.9M | 2.96% |
Retirement plan clients
Plans that reported this firm as an investment service provider on Form 5500 Schedule C.
| Plan | Location | Plan year |
|---|---|---|
| Kamco Supply Corporation Of Boston 401(k) Profit Sharing Plan Kamco Supply Corporation Of Boston | 2024 |
People (29)
roster as of Jul 20, 2026| Name | Role / title | Credentials | With firm since | Ownership |
|---|---|---|---|---|
| Banchick, Michael, G. | Chief Technology Officer | Apr 2017 (9y) | Less than 5% | |
| Richard Charles St. Onge | Chief Compliance Officer | Apr 2017 (9y) | Less than 5% | |
| Earl Bryan Winthrop | Managing Member (Class A), Elected Manager | May 2017 (9y) | 25% – 50% | |
| Lucas Alexander Winthrop | Chief Operating Officer, Elected Manager | Oct 2017 (9y) | Less than 5% | |
| Mark Steven Winthrop | Managing Member (Class A And B), Elected Manager | Oct 2017 (9y) | 25% – 50% | |
| Andrew Joseph Murphy | Co Chief Investment Officer | CFA | Mar 2018 (8y) | Less than 5% |
| Max Gustav Winthrop | Chief Operating Officer, Elected Manager | Mar 2018 (8y) | Less than 5% | |
| Harvey Alan Slaughter | Director Of Operations And Client Service, Executive | Oct 2022 (4y) | Less than 5% | |
| Edward Thomas Burke | Registered representative | CFA | Oct 2017 (9y) | |
| Peter Thomas Jaworski | Registered representative | CFP Chartered Financial Consultant | Oct 2017 (9y) | |
| Robert Eric Zola | Registered representative | CFP | Oct 2017 (9y) | |
| Gregory Paul Costantino | Registered representative | CFP | Mar 2018 (8y) | |
| Kenneth James Dean | Registered representative | CFP CFA | May 2018 (8y) | |
| Daniel L Castle | Registered representative | CFP Chartered Financial Consultant | Jun 2019 (7y) | |
| Richard Andrew Boehm | Registered representative | CFP | Aug 2020 (6y) | |
| Sheena Anne Oberoi | Registered representative | CFP | Aug 2020 (6y) | |
| Jonathan Peter Hunter | Registered representative | Nov 2021 (5y) | ||
| Francesca M Lanza | Registered representative | Nov 2022 (4y) | ||
| Aimee Margaret Lloyd | Registered representative | CFP | Nov 2022 (4y) | |
| Amber Michele Moser | Registered representative | CFP | Nov 2022 (4y) | |
| David Michael Moretsky | Registered representative | CFP Chartered Financial Consultant | Nov 2022 (4y) | |
| Robert James Reamer | Registered representative | CFP | Nov 2022 (4y) | |
| Sean Winthrop | Registered representative | Apr 2023 (3y) | ||
| Matthew Joseph Mc Grath | Registered representative | CFA | May 2025 (1y) | |
| Cavan M Lamontagne | Registered representative | Jun 2025 (1y) | ||
| David William Mercer | Registered representative | Sep 2025 (1y) | ||
| Robert Abendroth | Registered representative | CFP Chartered Financial Consultant | Apr 2026 (0y) | |
| Scott Cohen | Registered representative | Apr 2026 (0y) | ||
| Joseph M Anastasi | Registered representative | Jul 2026 (0y) |
Entity owners (Schedule A/B)
| Entity | Title / status | Since | Sch. | Ownership |
|---|---|---|---|---|
| Winthrop Family Irrevocable Trust | Trust (Class B) | Dec 2020 | A | 25% – 50% |
| Lpl Capital Partners, Inc. | Member (Class C) | Dec 2022 | A | 10% – 25% |
Undisclosed: 0% – 15% of the firm is not attributable from the filed Schedule A bands.
Roster from the IAPD representatives feed; ownership and acquisition dates from Form ADV Schedule A/B. "Since" is the earliest filed registration or acquisition date.
Retirement plans served (1)
| Plan | Sponsor | Participants | Plan assets | As of |
|---|---|---|---|---|
| Kamco Supply Corporation Of Boston 401(k) Profit Sharing Plan | Kamco Supply Corporation Of Boston | 312 | $41.7M | 11/01/2024 |
From Form 5500 service-provider disclosures.
Documents (1 archived)
| Form | Period | Size | |
|---|---|---|---|
| Form ADV (full filing) | 06/16/2026 | 1.03 MB | View · PDF · Source ↗ |
Archived copies of the firm's regulatory filings, versioned by content hash.
Disciplinary disclosures
No disciplinary events reported on the firm's latest Form ADV filing.
How they charge
- • Percentage of assets under management
- • Hourly charges
- • Fixed fees
- • Other fees
- • % RETIREMENT PLANS UNDER ADVISEMENT
Services
- • Financial planning services
- • Portfolio management for individuals/small businesses
- • Portfolio management for businesses/institutional clients
- • Pension consulting services
- • Selection of other advisers
Custody
Reported custodians
- LPL Financial $3.0B (97% of AUM) Jun 2026
Amounts as reported in ADV Item 5.K.(3) (custodians holding 10%+ of SMA assets).
Firm reports having custody of client funds or securities (Item 9.A).
Source
All data on this page comes from this firm's Form ADV filings, reproduced without modification. Latest filing: Jun 16, 2026.
View current Form ADV (SEC/IAPD) ↗