SEC-Registered Investment Adviser
Mainline Investment Advisers, LLC
Registration facts are from the firm's Form ADV Part 1A as published by the SEC, latest filing dated September 1, 2026. Figures are firm-level: they describe the advisory firm, not any single offering.
Registration
- Status
- Approved
- Registered since
- October 5, 2011
- Principal office
- 308 E. Lancaster Avenue, Suite 300, Wynnewood, PA 19096-2145
- Organized as
- Limited Liability Company, DE
- Fiscal year end
- December
- Umbrella registration
- Yes, 4 relying advisers
Scale
- Regulatory AUM
- $109.9M
- Discretionary / non-discretionary
- $84.4M / $25.5M
- Accounts
- 15
- Clients
- 1
- Employees
- 4, 3 in advisory roles
- Private funds advised
- 8
- Private fund gross assets
- $107.9M
- Fund types
- 6 private equity funds, 1 real estate funds, 1 venture capital funds
- Funds with Form D records
- 2 issuers in AltStreet's ledger, $17.2M reported sold across them
- Client assets in custody
- $28.8M (6 clients)
Business, clients and compensation, as filed
- Advisory activities
- portfolio management for individuals and small businesses and portfolio management for pooled investment vehicles
- Compensated by
- a percentage of assets under management, fixed fees, performance-based fees and other
- Client types
- high net worth individuals (7); pooled investment vehicles (9)
- Related persons include
- another investment adviser, a commodity pool operator or commodity trading advisor, a real estate broker or dealer, a sponsor or syndicator of limited partnerships and a sponsor, general partner or managing member of pooled investment vehicles
- Affiliates
- 2 investment advisers
Form ADV Item 11 disclosures
No yes answers on Item 11 as of the latest Form ADV (September 1, 2026). Item 11 covers the firm and its advisory affiliates.
Form D activity of the funds this firm advises, by year
2 issuers in AltStreet's EDGAR ledger are joined to this adviser through Form ADV Schedule D, with Form D filings from April 5, 2018 to December 8, 2022. Reported sold across them: $17.2M.Years are the year of each offering's first notice; sold and investors are the latest figures on each chain. Counts and totals only; the fund roster is in the terminal.
| First notice | Offerings | Reported sold | Investors |
|---|---|---|---|
| 2022 | 1 | $6.9M | 9 |
| 2018 | 1 | $10.3M | 2 |
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Source: SEC Form ADV via IARD (roster of October 6, 2026), matched to the platform by AltStreet analysts. Item 11 answers are as reported on the firm's Form ADV and cover the firm and its advisory affiliates; consult the firm's IAPD record for the Disclosure Reporting Pages. Brochure statements are the firm's own. Nothing on this page is investment advice.