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MASON CAPITAL MANAGEMENT LLC
CRD 158797File 801-73255
APPROVED
Custody
Filing as of Mar 31, 2026
Feed vintage Aug 17, 2026
Regulatory AUM
$2.24B
Top 25% of cohort (national)
Discretionary AUM
$1.73B
Non-discretionary $509.2M
Clients
5
5 accounts
Employees
15
Above cohort median in NY
Identity & registration
ADV Item 1- Organization form
- Limited Liability Company
- Firm type
- Registered
- SEC region
- NYRO
- Registration date
- Feb 24, 2012
- Principal office
- 110 E. 59TH STREET, 30TH FL, NEW YORK, NY, 10022-1304
- Phone
- 212-771-1200
- Website
- HTTP://WWW.MASONCAP.COM
Assets & accounts
ADV Item 5F- Total regulatory AUM
- $2.24B
- Discretionary AUM
- $1.73B
- Non-discretionary AUM
- $509.2M
- Discretionary accounts
- 4
- Non-discretionary accounts
- 1
- Total accounts
- 5
- AUM per client
- $447.5M
Clients by type
ADV Item 5D| Client type | Clients | AUM |
|---|---|---|
| Pooled investment vehicles | 5 | $2.24B |
Compensation & activities
ADV Items 5E, 5GCompensation
- Other
- Other (described) — ONE-TIME EQUITY GRANT FROM PRIVATELY HELD PORTFOLIO COMPANY
- Performance-based fees
- A percentage of assets under your management
Advisory activities
- Portfolio management for pooled investment vehicles
Custody
ADV Item 9- Firm Custody Cash
- Yes
- Firm Custody Assets
- Yes
- Firm Custody Clients
- Yes
- Firm Custody Securities
- Yes
- Related Person Custody Cash
- No
- 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 |
|---|---|---|---|
| Aug 12, 2026 | Registration | — | APPROVED |
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.