| H. M. Payson & Co. | Portland | $9.09B | 1 |
| R M Davis Inc | Portland | $8.15B | — |
| Greenbacker Capital Management LLC | Portland | $3.14B | 4 |
| Means Investment Co., Inc. | Bangor | $1.59B | 1 |
| Portland Global Advisors LLC | Portland | $1.17B | — |
| Headinvest, LLC | Portland | $891.8M | — |
| Great Diamond Partners, LLC | Portland | $804.1M | — |
| Old Port Advisors, Inc | Portland | $782.8M | — |
| Fow Partners, LP | Portland | $747.3M | 5 |
| Aries Wealth Management, LLC | Portland | $658.6M | — |
| Harpswell Capital Advisors, LLC | Yarmouth | $587M | — |
| Bigelow Investment Advisors, LLC | Portland | $555.2M | — |
| Penobscot Wealth Management | Portland | $544.5M | — |
| Coston, McIsaac, and Partners Inc. | Bar Harbor | $466.9M | — |
| Robinson Smith Wealth Advisors, LLC | South Portland | $444.9M | — |
| Choice Wealth Advisors LLC | Waterville | $323.3M | — |
| Birchbrook | Bangor | $296.5M | — |
| Rm Financial Services, LLC | Falmouth | $245.4M | — |
| Abbington Investment Group, LLC | South Portland | $202.1M | — |
| Clark & Stuart Inc | Portland | $195.6M | — |
| J.m. Arbour, LLC | Gardiner | $183.2M | — |
| Allegiance Financial Group, Inc. | South Portland | $180.6M | — |
| Outfitters Financial LLC | Brunswick | $157.7M | — |
| Grp Financial Services, LLC | Farmingdale | $155.3M | — |
| Maiden Cove Capital, LLC | Yarmouth | $153.7M | — |
| Blue Point Financial, Inc. | Scarborough | $152.7M | — |
| Alpha Capital Advisors, Inc. | Bangor | $146M | — |
| Gibson Financial Solutions, Inc. | Ellsworth | $133.7M | — |
| Wright Cove Capital, LLC | Portland | $120.7M | — |
| Volk Financial LLC | Falmouth | $116.5M | — |
| Oldfield Wealth Partners LLC | Bangor | $110M | — |
| Guidance Point Retirement Services, LLC | Portland | $88.2M | — |