Twin Oak ETF provides portfolio management for investment companies.
Twin Oak ETF reports 5 investment companies. These counts refer to investment vehicles, rather than the individual investors in them. Of its assets, 100.0% ($1.06B across 5 accounts) are managed with discretion.
| Client type | Clients | Assets |
|---|---|---|
| Investment companies | 100% | 100% |
Client breakdown and activity details
| Client type | Clients | Regulatory AUM | AUM share | Avg. per client |
|---|---|---|---|---|
| Investment companies | 5 | $1.06B | 100.0% | $212M |
| Total | 5 | $1.06B | 100% | $212M |
- Clients
- 5
- Regulatory AUM
- $1.06B
- AUM share
- 100.0%
- Avg. per client
- $212M
Total
- Clients
- 5
- Regulatory AUM
- $1.06B
- AUM share
- 100%
- Avg. per client
- $212M
- Clients outside the U.S.
- 0%
- Clients advised without assets under management last fiscal year
- 0
- Private funds advised
- 0
Twin Oak ETF is paid through a percentage of assets under management; its fees and minimums are set out in its brochures on the SEC website.
Twin Oak Holdings LP owns 75% or more of Twin Oak ETF and is in turn owned by Zachary Wainwright (50–75%), Turtle Holdings LLC (50–75%) and Etfholdings LP (25–50%). The leadership team of Twin Oak ETF includes Chief Investment Officer John Downing and Chief Compliance Officer Brian Mackenzie. It has 6 employees, 3 of them in advisory roles.
Leadership
- Brian MackenzieChief Compliance Officer
- John DowningChief Investment Officer
- Zachary WainwrightCEO
Staff
- 6 employees
- 3 in advisory functions
- 1 broker-dealer rep
- Owns 75% or more of Twin Oak ETF Company
Twin Oak Holdings LP
Control person · since February 2024
- Owns 50% to 75% of Twin Oak Holdings LP
Zachary Wainwright
Control person · since February 2024
- Owns 50% to 75% of Twin Oak Holdings LP
Turtle Holdings LLC
Control person · since August 2025
- Owns 50% to 75% of Turtle Holdings LLC
The Turtle Trust
Control person · since August 2025
Adam Meyer
Trustee · Control person · since August 2025
- Owns 25% to 50% of Twin Oak Holdings LP
Etfholdings LP
since February 2024
Twin Oak ETF’s regulatory assets grew Infinity× from $0 (July 2024) to $1.06B (September 2026); employees rose from 2 to 6.
Figures from each annual filing
| Filed | Regulatory AUM | Clients | Employees | Offices |
|---|---|---|---|---|
| September 2026 | $1.06B | 5 | 6 | 1 |
| April 2025 | $572M | 2 | 5 | 1 |
| July 2024 | $0 | 0 | 2 | 1 |
Besides its headquarters, Twin Oak ETF has 0 offices, with 1 listed address in Massachusetts.
Massachusetts · 1 listed address
- 888 Worcester St, Suite 200, WellesleyHQ
Contact and registration details
- Legal name
- Twin Oak ETF Company
- Headquarters
- 888 Worcester St, Suite 200, Wellesley, MA 02482
- Website
- twinoaketfs.com
- Phone
- 617-402-5495
- @twinoak
- SEC file
- 801-130584
- Structure
- Delaware corporation
- Fiscal year end
- December
Twin Oak ETF does not have custody of client assets.
How many clients does Twin Oak ETF have?
Twin Oak ETF has 5 clients and manages $1.06 billion for them, as of September 2026. They include 5 investment companies.
Source: Form ADV Part 1A, Items 5.D and 5.F, filed 23 September 2026
What services does Twin Oak ETF offer?
Twin Oak ETF provides portfolio management for investment companies.
Source: Form ADV Part 1A, Item 5.G, from the SEC's 2 October 2026 data file
How many financial advisors does Twin Oak ETF have?
Twin Oak ETF has 0 investment adviser representatives registered with state securities authorities, out of 6 employees, and 3 perform investment advisory functions. 1 employee is a registered representative of a broker-dealer and 0 employees are licensed insurance agents.
Source: Form ADV Part 1A, Items 5.A and 5.B, from the SEC's 2 October 2026 data file
Who owns Twin Oak ETF?
Twin Oak ETF is owned through a holding company by Zachary Wainwright and Etfholdings LP. Its direct owner is Twin Oak Holdings LP (75% or more).
Source: Form ADV Part 1A, Schedules A and B, filed 23 September 2026
How does Twin Oak ETF get paid?
Twin Oak ETF is paid through a percentage of assets under management. 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 Twin Oak ETF?
Twin Oak ETF’s main office is at 888 Worcester St, Suite 200, Wellesley, MA 02482. Its phone number is 617-402-5495. Its website is twinoaketfs.com.