Marnell Management provides portfolio management for pooled vehicles. The firm advises 1 private fund.
Marnell Management reports 3 pooled investment vehicles. These counts refer to investment vehicles, rather than the individual investors in them. Of its assets, 100.0% ($306M across 3 accounts) are managed with discretion. Of its clients, 66% are outside the U.S.
| Client type | Clients | Assets |
|---|---|---|
| Pooled investment vehicles | 100% | 100% |
Client breakdown and activity details
| Client type | Clients | Regulatory AUM | AUM share | Avg. per client |
|---|---|---|---|---|
| Pooled investment vehicles | 3 | $306M | 100.0% | $102M |
| Total | 3 | $306M | 100% | $102M |
- Clients
- 3
- Regulatory AUM
- $306M
- AUM share
- 100.0%
- Avg. per client
- $102M
Total
- Clients
- 3
- Regulatory AUM
- $306M
- AUM share
- 100%
- Avg. per client
- $102M
- Clients outside the U.S.
- 66%
- Clients advised without assets under management last fiscal year
- 0
- Private funds advised
- 1
Marnell 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.
Stevan Rosenberg owns 75% or more of Marnell Management. The leadership team of Marnell Management includes Chief Compliance Officer Ann Kvasnicka. It has 2 employees, 1 of them in advisory roles.
Leadership
- Ann KvasnickaChief Compliance Officer & Director of Operations
- Heather RosenbergMember
- Stevan RosenbergManaging Member
Staff
- 2 employees
- 1 in advisory functions
- Owns 75% or more of Marnell Management LLC
Stevan Rosenberg
Control person · since January 2015
- Owns 10% to 25% of Marnell Management LLC
Heather Rosenberg
since January 2015
Besides its headquarters, Marnell Management has 0 offices, with 1 listed address in Michigan.
Michigan · 1 listed address
- 30445 Northwestern Highway, Suite 235, Farmington HillsHQ
Contact and registration details
- Legal name
- Marnell Management LLC
- Headquarters
- 30445 Northwestern Highway, Suite 235, Farmington Hills, MI 48334
- Website
- marnellmanagement.com
- Phone
- 248-579-4531
- SEC file
- 801-136854
- Structure
- Michigan LLC
- Fiscal year end
- December
Marnell Management has custody of client assets.
Marnell Management’s reported 13F holdings for the quarter ended 30 June 2026 total $260M across 69 positions; the largest are Invesco Qqq TR (put option) (22.6%), Star Bulk Carriers Corp.. (4.9%) and Core Natural Resources Inc. (4.0%).
Reported 13F holdings
- $260M
- Reported 13F value
- 69
- Positions
- 50.3%
- In the 10 largest
- −9.4%
- Value vs. prior quarter
- Invesco Qqq TR · Unit Ser 1Put22.6%
- Star Bulk Carriers Corp.. · Shs Par4.9%
- Core Natural Resources Inc. · Com Shs4.0%
- Dht Holdings Inc. · Shs New3.4%
- Terawulf Inc.3.1%
- Torm PLC · Shs CL A2.6%
- Tidewater Inc. New2.5%
- Warrior Met Coal Inc.2.5%
- Vornado Rlty TR · SH Ben Int2.4%
- Garrett Motion Inc.2.3%
Together, the ten largest are 50.3% of reported value.
How many clients does Marnell Management have?
Marnell Management has 3 clients and manages $306 million for them, as of July 2026. They include 3 pooled investment vehicles.
Source: Form ADV Part 1A, Items 5.D and 5.F, filed 2 July 2026
What services does Marnell Management offer?
Marnell Management provides portfolio management for pooled vehicles.
Source: Form ADV Part 1A, Item 5.G, from the SEC's 2 October 2026 data file
How many financial advisors does Marnell Management have?
Marnell Management has 0 investment adviser representatives registered with state securities authorities, out of 2 employees, and 1 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
Who owns Marnell Management?
Marnell Management’s direct owners are Stevan Rosenberg (75% or more) and Heather Rosenberg (10% to 25%).
Source: Form ADV Part 1A, Schedules A and B, filed 2 July 2026
How does Marnell Management get paid?
Marnell 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 Marnell Management?
Marnell Management’s main office is at 30445 Northwestern Highway, Suite 235, Farmington Hills, MI 48334. Its phone number is 248-579-4531. Its website is marnellmanagement.com.