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BLACKSTONE ISG-II ADVISORS L.L.C.
CRD 289550File 801-111695
APPROVED
Custody
Filing as of Mar 30, 2026
Feed vintage Oct 1, 2026
Regulatory AUM
$8.01B
Top 10% of cohort (national)
Discretionary AUM
$8.01B
Clients
8
8 accounts
Employees
114
Top 25% of cohort in NY
Identity & registration
ADV Item 1- Organization form
- Limited Liability Company
- Firm type
- Registered
- SEC region
- NYRO
- Registration date
- Sep 18, 2017
- Principal office
- 345 PARK AVENUE, NEW YORK, NY, 10154
- Phone
- 212-583-5000
- Website
- HTTPS://WWW.BLACKSTONE.COM
Assets & accounts
ADV Item 5F- Total regulatory AUM
- $8.01B
- Discretionary AUM
- $8.01B
- Non-discretionary AUM
- $0
- Discretionary accounts
- 8
- Non-discretionary accounts
- 0
- Total accounts
- 8
- AUM per client
- $1.00B
Clients by type
ADV Item 5D| Client type | Clients | AUM |
|---|---|---|
| Pooled investment vehicles | 8 | $8.01B |
Compensation & activities
ADV Items 5E, 5GCompensation
- Performance-based fees
- A percentage of assets under your management
Advisory activities
- Selection of other advisers
- 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 | Change |
|---|---|---|---|---|
| Apr 1, 2026 | Employees | 97 | 114 | increased by17 |
| Apr 1, 2026 | Clients | 6 | 8 | increased by2 |
| Apr 1, 2026 | AUM | $14,468,008,713 | $8,006,994,436 | decreased by$6,461,014,277 |
| Apr 1, 2026 | Accounts | 6 | 8 | increased by2 |
| May 1, 2025 vs Oct 1, 2022 | Employees | 43 | 97 | increased by54 |
| May 1, 2025 vs Oct 1, 2022 | AUM | $6,551,808,950 | $14,468,008,713 | increased by$7,916,199,763 |
| Apr 1, 2022 | Employees | 33 | 43 | increased by10 |
| Apr 1, 2022 | AUM | $3,265,130,073 | $6,551,808,950 | increased by$3,286,678,877 |
| 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 “BLACKSTONE ISG-II” as a service provider on 5500mcp →Matched by name only — Form ADV and Form 5500 share no identifier, and names are searched loosely (“BLACKSTONE ISG-II” 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.