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AdvisorCensus / Financial advisors / Massachusetts / Boston / Mason Capital Partners

Mason Capital Partners

Boston, MASEC-registered investment adviserCRD 107412

Filed as MASON CAPITAL PARTNERS · Legal name Albert D Mason Inc

Mason Capital Partners is an SEC-registered investment advisory firm in Boston, MA, registered since 1976, reporting $100 million to $500 million in regulatory assets under management in its Form ADV filing dated March 31, 2026.

50 years
registered since 1976
$210,604,947
assets under management
1 arrangement
Percentage of assets
None
disclosure items (Item 11)

Quick answers

From the filing

How is Mason Capital Partners compensated?

On its Form ADV (Item 5.E, October 2026), Mason Capital Partners reports these compensation arrangements: a percentage of assets under its management.

What does Mason Capital Partners' brochure say about its fees?

Its Form ADV Part 2A brochure dated March 31, 2026 states: Asset-based fee: 1% of assets a year. Fees can differ by service and may be negotiable; the brochure is the complete statement.

Where is Mason Capital Partners located?

Mason Capital Partners' principal office is in Boston, MA, according to its Form ADV.

Is Mason Capital Partners registered with the SEC or a state?

Mason Capital Partners is an SEC-registered investment advisory firm, registered since 1976. Status as filed: Approved. CRD 107412.

How much does Mason Capital Partners manage?

Mason Capital Partners reports $210,604,947 in regulatory assets under management in its Form ADV filing dated March 31, 2026 (100% discretionary).

How have Mason Capital Partners' assets and staff changed since 2021?

In the Form ADV data for Mason Capital Partners: Regulatory assets under management: $192,226,032 in the October 2021 data and $210,604,947 in the October 2026 data, up 10%. Total employees: 6 in October 2021 and 7 in October 2026. Assets under management move with markets as well as with clients coming and going.

What types of clients does Mason Capital Partners serve?

By number of clients on Form ADV Item 5.D: high net worth individuals (96); individuals (other than high net worth individuals) (81); pooled investment vehicles (other than investment companies and business development companies) (2).

Which custodians does Mason Capital Partners use?

Mason Capital Partners' most recent Form ADV filing (Schedule D, Section 5.K(3)) lists Charles Schwab & Co., Inc. as a custodian holding 10% or more of its separately managed account assets.

Does Mason Capital Partners report any disciplinary disclosures?

Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/107412

What changed in Mason Capital Partners' recent Form ADV filings?

In the January 2026 filing data: No longer registered or notice-filed in MD, NC.

From the Form ADV filing

Every figure below is as the firm filed it with regulators, as of October 2026.

How the firm is compensated

Item 5.E
  • A percentage of assets under your management

Item 5.E lists how the firm is compensated for its advice; Items 5.B, 6.A, and 7.A show whether its people or related companies can also earn commissions. Percentage of assets, fixed, hourly, subscription, and performance-based fees come from clients (a performance-based fee depends on investment results); commissions come with a sale or a trade, often from the company behind the product. How fees, commissions, and other arrangements differ

Fees and minimums

Form ADV Part 2A

Asset-based fee: 1% of assets a year

The brochure's wording
The fees are generally charged at a rate of 1% (100 bps) per annum with some exceptions. The fee is typically charged quarterly in arrears based on the asset value at quarter end.

As stated in the firm's Form ADV Part 2A brochure dated March 31, 2026. Fees can differ by service and may be negotiable; the brochure is the complete statement. Read the brochure on the SEC's IAPD site

Regulatory assets under management

Item 5.F
$210,604,947

$210,604,947 as of October 2026, filing dated March 31, 2026.

Discretionary: $210,604,947.Non-discretionary: $0.

A measure of scale, not skill or returns. Discretionary means the firm decides trades; non-discretionary means clients approve each one. What assets under management means

Who the firm serves

Item 5.D
Individuals (other than high net worth individuals)
Clients 81 Assets $19,123,063 (9%)
High net worth individuals
Clients 96 Assets $122,257,474 (58%)
Banking or thrift institutions
Clients Fewer than 5 Assets $0 (0%)
Investment companies
Clients 0 Assets $0 (0%)
Business development companies
Clients 0 Assets $0 (0%)
Pooled investment vehicles (other than investment companies and business development companies)
Clients 2 Assets $60,111,930 (29%)
Pension and profit sharing plans (but not the plan participants or government pension plans)
Clients Fewer than 5 Assets $7,115,498 (3%)
Charitable organizations
Clients Fewer than 5 Assets $0 (0%)
State or municipal government entities (including government pension plans)
Clients Fewer than 5 Assets $0 (0%)
Other investment advisers
Clients Fewer than 5 Assets $0 (0%)
Insurance companies
Clients Fewer than 5 Assets $0 (0%)
Sovereign wealth funds and foreign official institutions
Clients Fewer than 5 Assets $0 (0%)
Corporations or other businesses not listed above
Clients Fewer than 5 Assets $1,996,982 (1%)

A firm with no individual clients is an institutional manager even if it manages billions; the mix tells you whom the practice is built around.

Advisory services

Item 5.G
  • Portfolio management for individuals and/or small businesses
  • Portfolio management for pooled investment vehicles (other than investment companies)
  • Portfolio management for businesses (other than small businesses) or institutional clients

Registration and firm details

Items 1, 2, 5
Legal name
Albert D Mason Inc
Registration
SEC-registered investment adviser. Status as filed: Approved.
Registered since
1976 (50 years)
Employees
Total: 7. Performing investment advisory functions: 4.
Wrap fee program participation
No.
Custodians (Schedule D, Section 5.K(3))

Custodians holding 10% or more of the firm's separately managed account assets, as filed on Form ADV (Schedule D, Section 5.K(3)). A custodian holds client assets; it does not endorse or supervise the firm. AdvisorCensus has no relationship with any custodian.

States registered or notice-filed
7 states or jurisdictions
CACOFLMAMENJNY

SEC-registered investment advisers are examined by the SEC. SEC, state, and exempt registration

Disclosures

Item 11

None Reports no disclosure items on Form ADV Item 11. View on IAPD.

Item 11 asks about criminal, regulatory, and civil events involving the firm and its advisory personnel. The detail of each yes answer is on the IAPD record. Reading a firm's disclosures

Assets and staff over time

Items 5.A, 5.F
$192M 2021 $214M 2022 $184M 2023 $201M 2024 $202M 2025 $211M 2026
Data periodAssets under managementEmployeesFiling dated
October 2026$210,604,9477March 31, 2026
October 2025$201,988,0177March 26, 2025
October 2024$200,538,1176March 26, 2024
October 2023$183,735,8866March 22, 2023
October 2022$213,823,1806March 30, 2022
October 2021$192,226,0326March 24, 2021

Regulatory assets under management: $192,226,032 in the October 2021 data and $210,604,947 in the October 2026 data, up 10%.

Total employees: 6 in October 2021 and 7 in October 2026.

As filed in each year's data for the same month. Assets under management move with markets as well as with clients coming and going; they measure scale, not skill or returns. Most firms update these figures once a year.

Changes in the filing

Last 12 months
  1. January 2026
    • No longer registered or notice-filed in MD, NC.

Compared month to month from the SEC's monthly adviser data and the state compilation feed. Owners and control persons are summarized, never named.

Websites listed on Form ADV

Item 1.I
fundamentalsfirstfund.commason-capital.com

Source: Form ADV, as of October 2026. Values appear as filed; a value the firm did not report is shown as "Not reported."

Cite this page

AdvisorCensus. Mason Capital Partners (CRD 107412): Form ADV filing data as of October 2026.
https://advisorcensus.com/firm/mason-capital-partners-boston-ma-107412