Mainline Investment Advisers, LLC
● SEC registered since 2011CRD 159045SEC# 801-72761Wynnewood, PA
Ranks #5,650 of 5,974 private fund managers by regulatory AUM.
Reg. AUM
$109.9M
Fund GAV
$107.9M
Private funds
8
Employees
4
Accounts
15
Location
Wynnewood, PA
About Mainline Investment Advisers
Mainline Investment Advisers identifies investment opportunities typically in small companies with exceptional ideas, products, or entrepreneurial leadership that need capital to grow. It provides funding intended to help those companies develop their platforms.
Summary based on the firm’s website.
Mainline Investment Advisers, LLC assets under management
Mainline Investment Advisers, LLC is an investment advisory firm registered with the SEC based in Wynnewood, PA. The firm has been registered since 2011. It reports $109.9 million in regulatory assets under management and employs 4 people. Mainline Investment Advisers, LLC manages 8 private funds with combined gross assets of $107.9 million, including Mlh Holdings, LLC. By regulatory assets, it ranks 5,650 of 5,974 private fund managers.
Mainline Investment Advisers, LLC private funds
8 funds · $107.9M GAV| Fund | Type | Gross assets | Min. |
|---|---|---|---|
| Mlh Holdings, LLC | Private Equity | $55.8M | $2M |
| Cape US Artestar, LLC | Private Equity | $18.3M | — |
| Mlip Mlh Investments, LLC | Private Equity | $17.8M | $1M |
| Mainline Cala del Sol Partners, L.P. | Real Estate | $5.7M | $400K |
| K Diamond LLC | Private Equity | $5.2M | — |
| Mainline Tu-K Industries, LLC | Venture Capital | $5.1M | $200K |
| Mainline So/Unequal Partners, L.P. | Private Equity | $42K | $100K |
| Mainline Special Opportunities Fund, L.P. | Private Equity | $1K | $250K |
Mainline Investment Advisers, LLC owners & executives
6 reported| Name | Title | Ownership | Since |
|---|---|---|---|
| David Andrew Clapper Control | Vice President, Secretary, Chief Operations Officer | Under 5% | 2011 |
| Donna Marie Rittershausen | Chief Compliance Officer | Under 5% | 2021 |
| Mainline Investment Partners, LLC Control | Sole Managing Member - 100% Owner | Over 75% | 2011 |
| William Alan Landman Control | President, Chief Executive Officer | Under 5% | 2011 |
| David Andrew Clapper Control | Member/Partner And Minority Owner | 25-50% | 2011 |
| William Alan Landman Control | Managing Member | 50-75% | 2011 |
Frequently asked questions
How much does Mainline Investment Advisers, LLC manage?
Mainline Investment Advisers, LLC reports $109.9 million in regulatory assets under management on its Form ADV.
How many private funds does Mainline Investment Advisers, LLC manage?
Mainline Investment Advisers, LLC manages 8 private funds with combined gross assets of $107.9 million.
How many employees does Mainline Investment Advisers, LLC have?
Mainline Investment Advisers, LLC reports 4 employees.
Where is Mainline Investment Advisers, LLC located?
Mainline Investment Advisers, LLC is based in Wynnewood, PA and has been SEC-registered since 2011.
Does Mainline Investment Advisers, LLC disclose fund performance?
Mainline Investment Advisers, LLC is not required to publicly disclose fund returns. Form ADV filings include assets, ownership, and service providers, shown above.
Contact & registration
| Address | 308 E. Lancaster Avenue, Suite 300, Wynnewood, PA 19096-2145 |
| Phone | 610-896-3000 |
| Office hours | 9:00 a.m. To 5:00 p.m. |
| SEC region | Philadelphia Regional Office (PLRO) |
| Umbrella registration | Yes |
| Discloses disciplinary history | No |
Regulatory AUM
$109.9M▼ 55%
Mar '25Form ADV, monthlySep '26
How this firm compares
Regulatory AUMTop 91%
Larger than 9% of 16,369 advisers
AUM vs fund managersTop 95%
Larger than 5% of 5,974 private-fund managers
Number of fundsTop 30%
More funds than 70% of fund managers
EmployeesTop 69%
More than 31% of 16,804 advisers
Assets under management
$109.9Mregulatory AUM
Discretionary $84.4MNon-discretionary $25.5M
Fund type mix
Private Equity6
Real Estate1
Venture Capital1
Service providers
Auditor
Administrator