Top 10 financial advisor firms in Maine

28 SEC-registered financial advisor firms are headquartered in Maine, with $28B in combined regulatory assets under management. The largest by assets are H. M. Payson & Co. ($9.09B), R M Davis ($8.15B) and Means Investment ($1.59B).

28
Financial advisor firms: $28B
Their combined AUM: $271M
Median firm AUM: 11,315
Clients of the top 10

The 10 largest by assets

1
H. M. Payson & Co.
RIA
$9.09B
0.40% to 1.00% a year
2
R M Davis
RIA
$8.15B
0.35% to 1.00% a year
3
Means Investment
RIA
$1.59B
1.00% to 2.00% a year
4
Portland Global Advisors
RIA
$1.17B
0.50% to 1.00% a year
5
HeadInvest
RIA
$892M
Up to 1.25% a year
6
Great Diamond Partners
RIA
$804M
0.50% to 1.20% a year
7
Old Port Advisors
RIA
$783M
0.50% to 1.00% a year
8
Aries Wealth Management
RIA
$659M
Regulatory AUM
9
Bigelow Investment Advisors
RIA
$555M
0.40% to 1.00%
10
Penobscot Wealth Management
RIA
$545M
0.40% to 1.00% a year

Profiles of the top 10

No. 1 · RIA

H. M. Payson & Co.

H. M. Payson & Co. is an investment adviser based in Portland, ME, registered with the SEC since 1966. It provides financial planning and investment management. Its clients include high-net-worth individuals, individual clients, and corporations and other businesses. Its regulatory assets under management total $9.09 billion, as filed on 31 March 2026.

H. M. Payson & Co. charges 0.40%–1.00% a year for its Investment management.

Regulatory AUM: $9.09B
Clients: 4,308
Advisory staff: 29
Fee schedule: 0.40% to 1.00% a year
Headquarters: One City Center, Ste 211, Portland, ME 04101
Phone: 207-772-3761
Website: hmpayson.com

No. 2 · RIA

R M Davis

R M Davis is an investment adviser based in Portland, ME, registered with the SEC since 1978. It provides financial planning and investment management. Its clients include high-net-worth individuals, individual clients and charitable organizations. Its regulatory assets under management total $8.15 billion, as filed on 30 March 2026.

R M Davis charges 0.35%–1.00% a year for its Investment Management Services.

Regulatory AUM: $8.15B
Clients: 2,437
Advisory staff: 25
Fee schedule: 0.35% to 1.00% a year
Custodians: Charles Schwab, Fidelity
Headquarters: 24 City Center, Portland, ME 04101-4069
Phone: 207-774-0022
Website: rmdavis.com

No. 3 · RIA

Means Investment

Means Investment is an investment adviser based in Bangor, ME, registered with the SEC since 2015. It provides financial planning and investment management. Its clients include high-net-worth individuals, individual clients, and pension and profit-sharing plans. Its regulatory assets under management total $1.59 billion, as filed on 14 September 2026.

Means Investment charges 1.00%–2.00% a year for its Investment Advisory Services.

Regulatory AUM: $1.59B
Clients: 1,375
Advisory staff: 15
Founded: 1935
Fee schedule: 1.00% to 2.00% a year
Custodians: Fidelity
Headquarters: 802 Stillwater Ave., Bangor, ME 04401-3614
Phone: 12079476763
Website: meanswealth.com

No. 4 · RIA

Portland Global Advisors

Portland Global Advisors is an investment adviser based in Portland, ME, registered with the SEC since 1997. It provides financial planning and investment management. Its clients include high-net-worth individuals, individual clients and charitable organizations. Its regulatory assets under management total $1.17 billion, as filed on 26 March 2026.

Portland Global Advisors charges 0.50%–1.00% a year for its Comprehensive Fee.

Regulatory AUM: $1.17B
Clients: 304
Advisory staff: 11
Founded: 1994
Fee schedule: 0.50% to 1.00% a year
Custodians: Fidelity
Headquarters: 217 Commercial St, Suite 400, Portland, ME 04101
Phone: 207-773-2773
Website: portlandglobal.com

No. 5 · RIA

HeadInvest

HeadInvest is an investment adviser based in Portland, ME, registered with the SEC since 2006. It provides financial planning and investment management. Its clients include high-net-worth individuals, charitable organizations and individual clients. Its regulatory assets under management total $892 million, as filed on 19 March 2026.

HeadInvest charges up to 1.25% a year for its Portfolio Management Services.

Regulatory AUM: $892M
Clients: 445
Advisory staff: 6
Founded: 1989
Fee schedule: Up to 1.25% a year
Custodians: Charles Schwab
Headquarters: 7 Custom House St, 4th Floor, Portland, ME 04101-4194
Phone: 207-773-5333
Website: headinvest.com

No. 6 · RIA

Great Diamond Partners

Great Diamond Partners is an investment adviser based in Portland, ME, registered with the SEC since 2019. It provides financial planning and investment management. Its clients include high-net-worth individuals, individual clients, and pension and profit-sharing plans. Its regulatory assets under management total $804 million, as filed on 14 September 2026.

Great Diamond Partners charges 0.50%–1.20% a year for its Portfolio management services.

Regulatory AUM: $804M
Clients: 533
Advisory staff: 7
Founded: 2019
Fee schedule: 0.50% to 1.20% a year
Custodians: Charles Schwab
Headquarters: 22 Monument Square, Suite 300, Portland, ME 04101
Phone: 207-274-2500
Website: greatdiamondpartners.com

No. 7 · RIA

Old Port Advisors

Old Port Advisors is an investment adviser based in Portland, ME, registered with the SEC since 2001. It provides financial planning and investment management. Its clients include high-net-worth individuals, individual clients, and pension and profit-sharing plans. Its regulatory assets under management total $783 million, as filed on 31 August 2026.

Old Port Advisors charges 0.50%–1.00% a year for its Asset Management.

Regulatory AUM: $783M
Clients: 856
Advisory staff: 10
Founded: 1994
Fee schedule: 0.50% to 1.00% a year
Custodians: Charles Schwab
Headquarters: 130 Middle Street, 2nd Floor, Portland, ME 04101-7104
Phone: 207-774-6552
Website: oldportadvisors.com

No. 8 · RIA

Aries Wealth Management

Aries Wealth Management is an investment adviser based in Portland, ME, registered with the SEC since 2015. It provides financial planning and investment management. Its clients include high-net-worth individuals, corporations and other businesses, and charitable organizations. Its regulatory assets under management total $659 million, as filed on 19 March 2026.

Regulatory AUM: $659M
Clients: 164
Advisory staff: 3
Founded: 2015
Custodians: Pershing, Charles Schwab
Headquarters: 70 Center Street, 2nd Floor, Portland, ME 04101
Phone: 207-536-0530
Website: arieswealthllc.com

No. 9 · RIA

Bigelow Investment Advisors

Bigelow Investment Advisors is an investment adviser based in Portland, ME, registered with the SEC since 2007. It provides financial planning and investment management. Its clients include high-net-worth individuals, pension and profit-sharing plans, and individual clients. Its regulatory assets under management total $555 million, as filed on 8 May 2026.

Bigelow Investment Advisors charges 0.40%–1.00% for its Firm fee schedule. The brochure does not state whether the rate is annual.

Regulatory AUM: $555M
Clients: 331
Advisory staff: 4
Fee schedule: 0.40% to 1.00%
Custodians: Charles Schwab
Headquarters: 2 Monument Square, Suite 701, Portland, ME 04101
Phone: 207-772-2900

No. 10 · RIA

Penobscot Wealth Management

Penobscot Wealth Management is an investment adviser based in Portland, ME, registered with the SEC since 2017. It provides financial planning and investment management. Its clients include high-net-worth individuals, individual clients and charitable organizations. Its regulatory assets under management total $545 million, as filed on 27 April 2026.

Penobscot Wealth Management charges 0.40%–1.00% a year for its Wealth Management Services.

Regulatory AUM: $545M
Clients: 562
Advisory staff: 7
Founded: 2000
Fee schedule: 0.40% to 1.00% a year
Custodians: Charles Schwab, Tiaa-Cref Individual & Institutional Services
Headquarters: One Monument Square, Suite 501, Portland, ME 04101
Phone: 207-990-1901
Website: penobscotfa.com

Questions about financial advisors in Maine

How many financial advisor firms are headquartered in Maine?

28 SEC-registered financial advisor firms report their principal office in Maine, managing $28B in regulatory assets between them. The other 3 advisers headquartered in the state are broker-dealers, other kinds of wealth firm, or fund and institutional managers.

Source: Form ADV Part 1A, Items 1.F, 5.D and 5.F

What is the largest financial advisor firm in Maine?

H. M. Payson & Co., with $9.09B in regulatory assets under management on its latest Form ADV. The next largest are R M Davis ($8.15B) and Means Investment ($1.59B).

Source: Form ADV Part 1A, Item 5.F

How large is a typical financial advisor firm in Maine?

The median firm manages $271M in regulatory assets. That is the midpoint of the 28 firms headquartered in Maine.

Source: Form ADV Part 1A, Item 5.F

How much do financial advisors in Maine charge?

Of the 10 largest firms, 9 publish an asset-based fee schedule for their main service in their brochure. The highest rate in those schedules runs from 1.00% to 2.00% of assets, depending on the firm; each firm's fee is in its profile above.

Source: Form ADV Part 2A brochures, Item 5

How can I check a financial advisor's record in Maine?

Search the firm or the person on the SEC's Investment Adviser Public Disclosure site, adviserinfo.sec.gov, which shows registrations, Form ADV filings and any disclosures. Each firm profile in this directory links its SEC record.

Source: SEC Investment Adviser Public Disclosure

How is this list ordered?

By regulatory assets under management as filed on Form ADV, largest first. A firm is included when its principal office is in the state and most of its client assets belong to individuals and its type is RIA, which leaves out broker-dealers, wirehouses, RIA networks, digital advice, bank, insurance and family-office firms. A firm with only a branch office here is listed in its own headquarters state.

Source: Niva directory methodology

Maine has 28 financial advisor firms; see every adviser in the state →

The 10 largest by assets

Profiles of the top 10

Questions about financial advisors in Maine

Top financial advisor firms by city in Maine