Harbor Ithaka WM provides portfolio management for individuals and small businesses, portfolio management for pooled vehicles, and selecting other managers. The firm advises 10 private funds.
Harbor Ithaka WM reports 43 clients. They include 33 high-net-worth individuals and 10 pooled investment vehicles. Of its assets, 80.1% ($137M across 54 accounts) are managed with discretion; $34M across 16 accounts are not. Of its clients, 93% are outside the U.S.
| Client type | Clients | Assets |
|---|---|---|
| High-net-worth individuals | 77% | 37% |
| Pooled investment vehicles | 23% | 63% |
Client breakdown and activity details
| Client type | Clients | Regulatory AUM | AUM share | Avg. per client |
|---|---|---|---|---|
| High-net-worth individuals | 33 | $64M | 37.4% | $1.94M |
| Pooled investment vehicles | 10 | $107M | 62.6% | $10.7M |
| Total | 43 | $171M | 100% | $3.98M |
- Clients
- 33
- Regulatory AUM
- $64M
- AUM share
- 37.4%
- Avg. per client
- $1.94M
- Clients
- 10
- Regulatory AUM
- $107M
- AUM share
- 62.6%
- Avg. per client
- $10.7M
Total
- Clients
- 43
- Regulatory AUM
- $171M
- AUM share
- 100%
- Avg. per client
- $3.98M
- Clients outside the U.S.
- 93%
- Clients advised without assets under management last fiscal year
- 0
- Private funds advised
- 10
Harbor Ithaka WM is paid through a percentage of assets under management and fixed fees (other than subscription fees); its fees and minimums are set out in its brochures on the SEC website.
Harbor Financial Holdings LLC owns 75% or more of Harbor Ithaka WM and is in turn owned by Lionfern Ventures LLC (75% or more). It has 7 employees, 3 of them in advisory roles.
Leadership
- Rafael Alcantara-LansbergManaging Director & CCO
Investment adviser representatives
2 representatives listed in the SEC register as of 9 October 2026.
- Carlos Alberto Machado
- Javier Bartolome Minana
Staff
- 7 employees
- 3 in advisory functions
- 3 state-registered reps
- 1 insurance agent
- 7 soliciting firms
- Owns 75% or more of Harbor Ithaka WM, LLC
Harbor Financial Holdings LLC
Control person · since August 2014
- Owns 75% or more of Harbor Financial Holdings LLC
Lionfern Ventures LLC
Control person · since January 2021
- Owns 75% or more of Lionfern Ventures LLC
Rafael Alcantara-Lansberg
Control person · since February 2019
Harbor Ithaka WM’s regulatory assets grew 1.6× from $107M (March 2021) to $171M (March 2026); clients rose from 16 to 43 and employees fell from 8 to 7.
Figures from each annual filing
| Filed | Regulatory AUM | Clients | Employees | Offices |
|---|---|---|---|---|
| March 2026 | $171M | 43 | 7 | 1 |
| March 2025 | $160M | 42 | 5 | 1 |
| March 2024 | $151M | 42 | 5 | 1 |
| May 2023 | $138M | 37 | 5 | 1 |
| April 2022 | $128M | 27 | 7 | 1 |
| March 2021 | $107M | 16 | 8 | 1 |
Besides its headquarters, Harbor Ithaka WM has 0 offices, with 1 listed address in Florida.
Florida · 1 listed address
- 19505 Biscayne Boulevard, Suite 2350, AventuraHQ
Contact and registration details
- Legal name
- Harbor Ithaka WM, LLC
- Headquarters
- 19505 Biscayne Boulevard, Suite 2350, Aventura, FL 33180
- Website
- harbor-ithaka.com
- Phone
- 305-755-7600
- @harbor-ithaka
- SEC file
- 801-113143
- Structure
- Florida LLC
- Fiscal year end
- December
Harbor Ithaka WM uses Bank Ozk ($107M, 65%), Morgan Stanley ($34M, 21%) and Stonex Financial ($22.5M, 14%) as custodians for its separately managed accounts. Harbor Ithaka WM does not have custody of client assets.
- Morgan StanleyMorgan Stanley Smith Barney LLC · Purchase, NY · $34M21%
- Stonex FinancialStonex Financial Inc. · Winter Park, FL · $22.5M14%
- Bank OzkBank Ozk · Little Rock, AR · $107M65%
At year end, Harbor Ithaka WM’s separately managed accounts were mostly in funds (53%) and stocks (25%).
What the accounts hold
- Stocks25%
- Funds53%
- Pooled vehicles37%
- Registered funds16%
- Bonds7%
- Investment grade corporate bonds5%
- U.S. government and agency bonds1%
- High-yield corporate bonds1%
- Cash15%
How many clients does Harbor Ithaka WM have?
Harbor Ithaka WM has 43 clients and manages $171 million for them, as of March 2026. They include 33 high-net-worth individuals and 10 pooled investment vehicles.
Source: Form ADV Part 1A, Items 5.D and 5.F, filed 31 March 2026
What services does Harbor Ithaka WM offer?
Harbor Ithaka WM provides portfolio management for individuals and small businesses, portfolio management for pooled vehicles, and selecting other managers.
Source: Form ADV Part 1A, Item 5.G, from the SEC's 2 October 2026 data file
Which custodians does Harbor Ithaka WM use?
Harbor Ithaka WM’s separately managed account assets are held at Bank Ozk (Little Rock, AR), with $107M, Morgan Stanley Smith Barney LLC (Purchase, NY), with $34M and Stonex Financial Inc. (Winter Park, FL), with $22.5M. Only custodians holding at least a tenth of those assets are named.
Source: Form ADV Part 1A, Schedule D, Section 5.K.(3), filed 31 March 2026
How many financial advisors does Harbor Ithaka WM have?
Harbor Ithaka WM has 3 investment adviser representatives registered with state securities authorities, out of 7 employees, and 3 perform investment advisory functions. 0 employees are registered representatives of a broker-dealer and 1 employee is a licensed insurance agent.
Source: Form ADV Part 1A, Items 5.A and 5.B, from the SEC's 2 October 2026 data file
What does Harbor Ithaka WM invest in?
At the end of its last fiscal year, Harbor Ithaka WM’s separately managed accounts held 37% pooled vehicles (private funds and similar), 25% exchange-traded equities, 16% registered funds (mutual funds, ETFs, BDCs), 15% cash and equivalents, 5% investment grade corporate bonds, 1% U.S. government and agency bonds and 1% high-yield corporate bonds. It advises 10 private funds.
Source: Form ADV Part 1A, Items 5.K.(1) and 7.B, from the SEC's 2 October 2026 data file
Who owns Harbor Ithaka WM?
Harbor Ithaka WM is owned through a chain of holding companies by Rafael Alcantara-Lansberg. Its direct owner is Harbor Financial Holdings LLC (75% or more).
Source: Form ADV Part 1A, Schedules A and B, filed 31 March 2026
How does Harbor Ithaka WM get paid?
Harbor Ithaka WM is paid through a percentage of assets under management and fixed fees. Its Form ADV lists no commissions or performance-based fees among how it is paid.
Source: Form ADV Part 1A, Item 5.E, from the SEC's 2 October 2026 data file
How do I contact Harbor Ithaka WM?
Harbor Ithaka WM’s main office is at 19505 Biscayne Boulevard, Suite 2350, Aventura, FL 33180. Its phone number is 305-755-7600. Its website is harbor-ithaka.com.