# MAINLINE INVESTMENT ADVISERS, LLC

MAINLINE INVESTMENT ADVISERS, LLC of WYNNEWOOD, PA is an SEC-registered investment adviser.

## Registration

- CRD: 159045
- Type: SEC-registered investment adviser
- SEC file number: 801-72761
- Location: 308 E. LANCASTER AVENUE, SUITE 300, WYNNEWOOD, PA, 19096-2145
- Phone: 610-896-3000
- Latest filing: 2026-04-28
- Regulatory AUM: $109.9M
- Discretionary AUM: $84.4M
- Non-discretionary AUM: $25.5M
- Clients: 4
- Accounts: 15

## Business model

- Compensation: % of AUM, Fixed, Performance, Other
- Clients served: High net worth, Investment cos

## Officers, owners & control persons (12)

| Name | Role | Location |
| --- | --- | --- |
| William Alan Landman | MANAGING MEMBER; PRESIDENT, CHIEF EXECUTIVE OFFICER | Wynnewood, PA |
| Donna Marie Rittershausen | CHIEF COMPLIANCE OFFICER | — |
| David Andrew Clapper | MEMBER/PARTNER AND MINORITY OWNER; VICE PRESIDENT, SECRETARY, CHIEF OPERATIONS OFFICER | — |
| William J Romanelli | TREASURER AND VICE PRESIDENT, CHIEF FINANCIAL OFFICER | — |
| MITCHELL RICHARD ALAN | CHIEF COMPLIANCE OFFICER, GENERAL COUNSEL, VICE PRESIDENT AND SECRETARY | — |
| LANDMAN WILLIAM ALAN | MANAGER; MANAGING MEMBER; MEMBER, MANAGER (+2 more) | — |
| CLAPPER DAVID ANDREW | CFO, VICE PRESIDENT, ASSISTANT SECRETARY; MEMBER/PARTNER AND MINORITY OWNER; VICE PRESIDENT, ASSISTANT SECRETARY (+1 more) | — |
| BROWN MATTHEW WARREN | VICE PRESIDENT | — |
| RITTERSHAUSEN DONNA MARIE | CHIEF COMPLIANCE OFFICER; SECRETARY, CHIEF COMPLIANCE OFFICER | — |
| ADAMS JOHN TUCKER | CFO, TREASURER, VICE PRESIDENT | — |
| CHADWICK ALEXANDER C | VICE PRESIDENT | — |
| ROMANELLI WILLIAM J | CFO, TREASURER AND VICE PRESIDENT; TREASURER AND VICE PRESIDENT, CHIEF FINANCIAL OFFICER | — |


## Private funds (9)

Mix: Private Equity Fund 7 · Real Estate Fund 1 · Venture Capital Fund 1

| Fund | Type | Formed | Owners | GAV | Min investment |
| --- | --- | --- | --- | --- | --- |
| MLH HOLDINGS, LLC | Private Equity Fund | Delaware | 3 | $55.8M | $2.0M |
| CAPE US ARTESTAR, LLC | Private Equity Fund | Delaware | 28 | $18.3M | — |
| MLIP MLH INVESTMENTS, LLC | Private Equity Fund | Delaware | 3 | $17.8M | $1.0M |
| MAINLINE CALA DEL SOL PARTNERS, L.P. | Real Estate Fund | Delaware | 5 | $5.7M | $400K |
| K DIAMOND LLC | Private Equity Fund | Delaware | 27 | $5.2M | — |
| MAINLINE TU-K INDUSTRIES, LLC | Venture Capital Fund | Delaware | 10 | $5.1M | $200K |
| MAINLINE SO/UNEQUAL PARTNERS, L.P. | Private Equity Fund | Delaware | 23 | $42K | $100K |
| MAINLINE SPECIAL OPPORTUNITIES FUND, L.P. | Private Equity Fund | Delaware | 8 | $1K | $250K |
| CMS PLATINUM FUND, L.P. | Private Equity Fund | Delaware | 52 | — | $500K |


## Related pages

- Form ADV Part 2 brochure: https://search.stillhousedata.com/firm/159045/brochure
- Similar advisers: https://search.stillhousedata.com/firm/159045/similar
- Related entities: https://search.stillhousedata.com/firm/159045/related
- SEC IAPD (source of record): https://adviserinfo.sec.gov/firm/summary/159045

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Source: public SEC Form ADV data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.