Mountaineer Partners Management provides portfolio management for investment companies, portfolio management for pooled vehicles and portfolio management for institutions. The firm advises 3 private funds.
Mountaineer Partners Management reports 4 clients. They include 3 pooled investment vehicles and 1 investment company. Of its assets, 100.0% ($306M across 5 accounts) are managed with discretion. Of its clients, 40% are outside the U.S.
| Client type | Clients | Assets |
|---|---|---|
| Investment companies | 25% | 19% |
| Pooled investment vehicles | 75% | 32% |
| Charitable organizations | Fewer than 5 | 49% |
Client shares use reported counts. Client types without a reported count are excluded from that total.
Client breakdown and activity details
| Client type | Clients | Regulatory AUM | AUM share | Avg. per client |
|---|---|---|---|---|
| Investment companies | 1 | $58M | 19.0% | $58M |
| Pooled investment vehicles | 3 | $97.2M | 31.8% | $32.4M |
| Charitable organizations | Fewer than 5 | $151M | 49.2% | — |
| Total | 4 | $306M | 100% | — |
- Clients
- 1
- Regulatory AUM
- $58M
- AUM share
- 19.0%
- Avg. per client
- $58M
- Clients
- 3
- Regulatory AUM
- $97.2M
- AUM share
- 31.8%
- Avg. per client
- $32.4M
- Clients
- Fewer than 5
- Regulatory AUM
- $151M
- AUM share
- 49.2%
- Avg. per client
- —
Total
- Clients
- 4
- Regulatory AUM
- $306M
- AUM share
- 100%
- Avg. per client
- —
- Clients outside the U.S.
- 40%
- Clients advised without assets under management last fiscal year
- 0
- Private funds advised
- 3
Mountaineer Partners Management is paid through a percentage of assets under management and performance-based fees; its fees and minimums are set out in its brochures on the SEC website.
Mark Lee owns 75% or more of Mountaineer Partners Management. The leadership team of Mountaineer Partners Management includes Chief Compliance Officer Gregory Williams. It has 4 employees, 3 of them in advisory roles.
Staff
- 4 employees
- 3 in advisory functions
- Owns 75% or more of Mountaineer Partners Management, LLC
Mark Lee
Control person · since May 2011
Mountaineer Partners Management’s regulatory assets grew from $226M (May 2021) to $306M (March 2026); clients were 4 in both filings and employees fell from 5 to 4.
Figures from each annual filing
| Filed | Regulatory AUM | Clients | StaffEmployees | Offices |
|---|---|---|---|---|
| Mar 2026March 2026 | $306M | 4 | 4 | 1 |
| Mar 2025March 2025 | $187M | 4 | 4 | 1 |
| Mar 2024March 2024 | $253M | 4 | 3 | 1 |
| Mar 2023March 2023 | $303M | 4 | 5 | 1 |
| Mar 2022March 2022 | $316M | 4 | 5 | 1 |
| May 2021May 2021 | $226M | 4 | 5 | 1 |
Besides its headquarters, Mountaineer Partners Management has 0 offices, with 1 listed address in 1 state.
New York · 1 listed address
- 950 Third Avenue, 28th Floor, New YorkHQ
Contact and registration details
- Legal name
- Mountaineer Partners Management, LLC
- Headquarters
- 950 Third Avenue, 28th Floor, New York, NY 10022
- Website
- Not reported
- Phone
- 646-459-7064
- SEC file
- 801-78304
- Structure
- Delaware LLC
- Fiscal year end
- December
Mountaineer Partners Management’s named custodian for separately managed accounts is Merrill Lynch Professional Clearing ($151M). Mountaineer Partners Management has custody of $97.2M for 3 clients.
- Merrill Lynch Professional ClearingMerrill Lynch Professional Clearing Corp. · New York, NY · $151M100%
At year end, Mountaineer Partners Management’s separately managed accounts were mostly in stocks (78%) and cash (23%). Its reported 13F holdings for the quarter ended 30 June 2026 total $137M across 11 positions; the largest are Century Alum CO (16.8%), Sensient Technologies Corp. (11.8%) and Constellium SE (11.2%).
What the accounts hold
- Stocks78%
- Cash23%
How many clients does Mountaineer Partners Management have?
Mountaineer Partners Management has 4 clients and manages $306 million for them, as of March 2026. They include 3 pooled investment vehicles and 1 investment company.
Source: Form ADV Part 1A, Items 5.D and 5.F, filed 31 March 2026
What services does Mountaineer Partners Management offer?
Mountaineer Partners Management provides portfolio management for investment companies, portfolio management for pooled vehicles and portfolio management for institutions.
Source: Form ADV Part 1A, Item 5.G, from the SEC's 2 October 2026 data file
Which custodians does Mountaineer Partners Management use?
Mountaineer Partners Management’s separately managed account assets are held at Merrill Lynch Professional Clearing Corp. (New York, NY), with $151M. 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 Mountaineer Partners Management have?
Mountaineer Partners Management has 0 investment adviser representatives registered with state securities authorities, out of 4 employees, and 3 perform investment advisory functions. None are registered representatives of a broker-dealer or licensed insurance agents.
Source: Form ADV Part 1A, Items 5.A and 5.B, from the SEC's 2 October 2026 data file
What does Mountaineer Partners Management invest in?
At the end of its last fiscal year, Mountaineer Partners Management’s separately managed accounts held 78% exchange-traded equities and 23% cash and equivalents. It advises 3 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 Mountaineer Partners Management?
Mountaineer Partners Management’s direct owner is Mark Lee (75% or more).
Source: Form ADV Part 1A, Schedules A and B, filed 31 March 2026
How does Mountaineer Partners Management get paid?
Mountaineer Partners Management is paid through a percentage of assets under management and performance-based fees. Its Form ADV lists no commissions 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 Mountaineer Partners Management?
Mountaineer Partners Management’s main office is at 950 Third Avenue, 28th Floor, New York, NY 10022. Its phone number is 646-459-7064.