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MAINLINE INVESTMENT ADVISERS, LLC
CRD 159045File 801-72761
APPROVED
Retail clients
Custody
Filing as of Sep 1, 2026
Feed vintage Oct 1, 2026
Regulatory AUM
$109.9M
Bottom 25% of cohort (national)
Discretionary AUM
$84.4M
Non-discretionary $25.5M
Clients
16
15 accounts
Employees
4
Bottom 25% of cohort in PA
Identity & registration
ADV Item 1- Organization form
- Limited Liability Company
- Firm type
- Registered
- SEC region
- PLRO
- Registration date
- Oct 5, 2011
- Principal office
- 308 E. LANCASTER AVENUE, SUITE 300, WYNNEWOOD, PA, 19096-2145
- Phone
- 610-896-3000
- Website
- HTTPS://WWW.MAINLINECO.COM
Assets & accounts
ADV Item 5F- Total regulatory AUM
- $109.9M
- Discretionary AUM
- $84.4M
- Non-discretionary AUM
- $25.5M
- Discretionary accounts
- 6
- Non-discretionary accounts
- 9
- Total accounts
- 15
- AUM per client
- $6.9M
Clients by type
ADV Item 5D| Client type | Clients | AUM |
|---|---|---|
| High net worth individuals | 7 | $2.0M |
| Pooled investment vehicles | 9 | $107.9M |
Compensation & activities
ADV Items 5E, 5GCompensation
- Other
- Fixed fees
- Other (described) — A PERCENTAGE OF COMMITTED OR CONTRIBUTED CAPITAL
- Performance-based fees
- A percentage of assets under your management
Advisory activities
- Portfolio management for pooled investment vehicles
- Portfolio management for individuals and/or small businesses
Custody
ADV Item 9- Firm Custody Cash
- Yes
- Firm Custody Assets
- Yes
- Firm Custody Clients
- Yes
- Firm Custody Securities
- Yes
- Related Person Custody Cash
- Yes
- Related Person Custody Assets
- No
- Related Person Custody Clients
- No
- Related Person Custody Securities
- Yes
Disclosure events
ADV Item 11This firm answered no to every Item 11 disclosure question in this filing.
Filed changes
| Date | Field | From | To | Change |
|---|---|---|---|---|
| May 1, 2026 | AUM | $109,796,880 | $109,927,979 | increased by$131,099 |
| Apr 1, 2026 | Employees | 5 | 4 | decreased by1 |
| Apr 1, 2026 | Clients | 15 | 16 | increased by1 |
| Apr 1, 2026 | AUM | $200,838,563 | $109,796,880 | decreased by$91,041,683 |
| May 1, 2025 vs Oct 1, 2022 | Clients | 16 | 15 | decreased by1 |
| May 1, 2025 vs Oct 1, 2022 | AUM | $435,072,100 | $200,838,563 | decreased by$234,233,537 |
| May 1, 2025 vs Oct 1, 2022 | Accounts | 16 | 15 | decreased by1 |
| Apr 1, 2022 | Clients | 20 | 16 | decreased by4 |
| Apr 1, 2022 | AUM | $404,993,715 | $435,072,100 | increased by$30,078,385 |
| Apr 1, 2022 | Accounts | 20 | 16 | decreased by4 |
| Oct 1, 2021 | Employees | 6 | 5 | decreased by1 |
| Oct 1, 2021 | Clients | 11 | 20 | increased by9 |
| Oct 1, 2021 | AUM | $296,577,975 | $404,993,715 | increased by$108,415,740 |
| Oct 1, 2021 | Accounts | 11 | 20 | increased by9 |
| Apr 1, 2021 | Registration | — | APPROVED |
On Form 5500, an adviser usually appears as a plan service provider (Schedule C), not the plan sponsor.
See plans that list “MAINLINE INVESTMENT” as a service provider on 5500mcp →Matched by name only — Form ADV and Form 5500 share no identifier, and names are searched loosely (“MAINLINE INVESTMENT” may also match similarly-named firms). Confirm identity against each filing.
Every value above is reproduced from this firm's Form ADV filing. Fields the firm left blank are shown as “Not reported” rather than filled in from other sources.