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AdvisorCensus / Financial advisors / Massachusetts / Boston / Harbor Island Capital LLC

Harbor Island Capital LLC

Topsfield, MASEC-registered investment adviserCRD 107457

Filed as HARBOR ISLAND CAPITAL LLC

Harbor Island Capital LLC is an SEC-registered investment advisory firm in Topsfield, MA, registered since 2018, reporting $100 million to $500 million in regulatory assets under management in its Form ADV filing dated June 15, 2026.

8 years
registered since 2018
$277,626,655
assets under management
1 arrangement
Percentage of assets
None
disclosure items (Item 11)

Quick answers

From the filing

How is Harbor Island Capital LLC compensated?

On its Form ADV (Item 5.E, October 2026), Harbor Island Capital LLC reports these compensation arrangements: a percentage of assets under its management. The amounts are in Item 5 of its Form ADV Part 2A brochure.

Where is Harbor Island Capital LLC located?

Harbor Island Capital LLC's principal office is in Topsfield, MA, according to its Form ADV.

Is Harbor Island Capital LLC registered with the SEC or a state?

Harbor Island Capital LLC is an SEC-registered investment advisory firm, registered since 2018. Status as filed: Approved. CRD 107457.

How much does Harbor Island Capital LLC manage?

Harbor Island Capital LLC reports $277,626,655 in regulatory assets under management in its Form ADV filing dated June 15, 2026 (100% discretionary).

How have Harbor Island Capital LLC's assets and staff changed since 2021?

In the Form ADV data for Harbor Island Capital LLC: Regulatory assets under management: $166,067,592 in the October 2021 data and $277,626,655 in the October 2026 data, up 67%. Total employees: 2 in October 2021 and 2 in October 2026. Assets under management move with markets as well as with clients coming and going.

What types of clients does Harbor Island Capital LLC serve?

By number of clients on Form ADV Item 5.D: high net worth individuals (13); other (1).

Which custodians does Harbor Island Capital LLC use?

Harbor Island Capital LLC's 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 Harbor Island Capital LLC 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/107457

What changed in Harbor Island Capital LLC's recent Form ADV filings?

In the April 2026 filing data: Regulatory assets under management went from $226,903,079 to $277,626,655 (+22%).

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

See the firm's brochure (dated June 15, 2026) for its fees and any account minimum, on the SEC's IAPD site.

Regulatory assets under management

Item 5.F
$277,626,655

$277,626,655 as of October 2026, filing dated June 15, 2026.

Discretionary: $277,626,655.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
High net worth individuals
Clients 13 Assets $257,020,609 (93%)
Other
Clients 1 Assets $20,606,046 (7%)

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

Registration and firm details

Items 1, 2, 5
Registration
SEC-registered investment adviser. Status as filed: Approved.
Registered since
2018 (8 years)
Employees
Total: 2. Performing investment advisory functions: 2.
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
2 states or jurisdictions
MANH

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
$166M 2021 $235M 2022 $166M 2023 $208M 2024 $227M 2025 $278M 2026
Data periodAssets under managementEmployeesFiling dated
October 2026$277,626,6552June 15, 2026
October 2025$226,903,0792February 20, 2025
October 2024$207,725,8092March 5, 2024
October 2023$165,698,6222March 15, 2023
October 2022$234,681,8852March 16, 2022
October 2021$166,067,5922March 15, 2021

Regulatory assets under management: $166,067,592 in the October 2021 data and $277,626,655 in the October 2026 data, up 67%.

Total employees: 2 in October 2021 and 2 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. April 2026
    • Regulatory assets under management went from $226,903,079 to $277,626,655 (+22%).

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

Not reported.

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. Harbor Island Capital LLC (CRD 107457): Form ADV filing data as of October 2026.
https://advisorcensus.com/firm/harbor-island-capital-llc-topsfield-ma-107457