Blackstone Isg I Advisors L.L.C.
- Regulatory AUM
- $184B
- Discretionary
- $184B
- Clients
- 44
- Avg AUM / client
- $4.2B
- Accounts
- 44
- Employees
- 114
AUM over time
Annual snapshots from Form ADV filings · as of Mar 30, 2026
Asset allocation (SMA assets by investment type)
as of Mar 30, 2026Share of SMA assets by investment vehicle type, as filed in Form ADV Item 5.K. Dollar figures are percentages applied to total regulatory AUM.
Who they serve
| Client type | Clients | AUM | % of AUM |
|---|---|---|---|
| Pooled investment vehicles (non-investment companies) | 6 | $917M | 0.5% |
| Insurance companies | 38 | $183B | 99.5% |
Private funds (4)
Reported in Form ADV Section 7.B.(1), filing of Oct 2024 · $836M combined gross assets
| Fund | Type | Domicile | Gross assets | Owners |
|---|---|---|---|---|
| Blackstone Holdings Partners L.P. | Private Equity Fund | Cayman Islands | $541M | 1 |
| Bisa Co Invest Fund (Cayman) L.P. | Private Equity Fund | Cayman Islands | $134M | 1 |
| Bisa Co Invest Fund Ii L.P. | Private Equity Fund | Delaware | $95.9M | 1 |
| Bisa Co Invest Fund L.P. | Private Equity Fund | Delaware | $65.0M | 1 |
People (5)
| Name | Role / title | Credentials | With firm since | Ownership |
|---|---|---|---|---|
| Schwartz, Neil, Douglas | Chief Compliance Officer | Mar 2021 (5y) | Less than 5% | |
| Young, Robert, Freddie | General Counsel | Jun 2021 (5y) | Less than 5% | |
| Hoghooghi, Ida | Chief Operating Officer | Mar 2022 (4y) | Less than 5% | |
| Dellaert, Gilles, Maurice | Global Head Of Blackstone Credit And Insurance | Jan 2024 (3y) | Less than 5% | |
| Skinner, William, P | Chief Financial Officer | Jan 2024 (3y) | Less than 5% |
Entity owners (Schedule A/B)
| Entity | Title / status | Since | Sch. | Ownership |
|---|---|---|---|---|
| Blackstone Intermediary Holdco L.L.C. | Sole Member | Aug 2017 | A | 75% or more |
| Blackstone Holdings I L.P. | Limited Partner | Jun 2007 | B | ≈ 31.64% – 100% via Blackstone Group Holdings L.P. |
| Blackstone Group Holdings L.P. | Limited Partner | Jul 2011 | B | ≈ 42.19% – 100% via Blackstone Securities Partners L.P. |
| Blackstone Inc. | Sole Member | Jun 2007 | B | 75% or more of Blackstone Holdings I/Ii Gp L.L.C. (indirect) |
| Blackstone Securities Partners L.P. | Sole Member | Jul 2011 | B | ≈ 56.25% – 100% via Blackstone Intermediary Holdco L.L.C. |
| Blackstone Holdings I/Ii Gp L.L.C. | General Partner | Jun 2007 | B | GP / trustee / elected manager of Blackstone Holdings I L.P. (indirect) |
Undisclosed: 0% – 25% of the firm is not attributable from the filed Schedule A bands.
Estimated effective ownership (look-through of filed bands):
- Blackstone Holdings I L.P.: 75% – 100% of Blackstone Group Holdings L.P. × 75% – 100% of Blackstone Securities Partners L.P. × 75% – 100% of Blackstone Intermediary Holdco L.L.C. × 75% – 100% direct ≈ 31.64% – 100% of the firm
- Blackstone Group Holdings L.P.: 75% – 100% of Blackstone Securities Partners L.P. × 75% – 100% of Blackstone Intermediary Holdco L.L.C. × 75% – 100% direct ≈ 42.19% – 100% of the firm
- Blackstone Securities Partners L.P.: 75% – 100% of Blackstone Intermediary Holdco L.L.C. × 75% – 100% direct ≈ 56.25% – 100% of the firm
Roster from the IAPD representatives feed; ownership and acquisition dates from Form ADV Schedule A/B. "Since" is the earliest filed registration or acquisition date.
Private funds (4, $836M gross assets)
| Fund | Type | Gross assets | Min. investment | Owners |
|---|---|---|---|---|
| Blackstone Holdings Partners L.P. | Private Equity Fund | $541M | $0 | 1 |
| Bisa Co Invest Fund (Cayman) L.P. | Private Equity Fund | $134M | $0 | 1 |
| Bisa Co Invest Fund Ii L.P. | Private Equity Fund | $95.9M | $0 | 1 |
| Bisa Co Invest Fund L.P. | Private Equity Fund | $65.0M | $0 | 1 |
From Form ADV Section 7.B private fund reporting.
Documents (1 archived)
| Form | Period | Size | |
|---|---|---|---|
| Form ADV (full filing) | 03/30/2026 | 5.37 MB | View · PDF · Source ↗ |
Archived copies of the firm's regulatory filings, versioned by content hash.
Disciplinary disclosures
No disciplinary events reported on the firm's latest Form ADV filing.
How they charge
- • Percentage of assets under management
Services
- • Portfolio management for pooled investment vehicles
- • Portfolio management for businesses/institutional clients
- • Selection of other advisers
Custody
Reported custodians
- BNY Mellon $127B (69% of AUM) Mar 2026
- Citibank $52.1B (28% of AUM) Mar 2026
- Brown Brothers Harriman & Co. $21.1B (94% of AUM) Jan 2019
- Bnp Paribas $3.3B (2% of AUM) Mar 2026
- Federal Home Loan Bank Of Atlanta: Fhlbank Atlanta $713M (3% of AUM) Dec 2017
- U.S. Bank $112M (1% of AUM) Dec 2017
- J.P. Morgan $91.1M (0% of AUM) Mar 2026
- Wilmington Trust Company $25.6M (0% of AUM) Dec 2017
Amounts as reported in ADV Item 5.K.(3) (custodians holding 10%+ of SMA assets).
Firm reports having custody of client funds or securities (Item 9.A).
Source
All data on this page comes from this firm's Form ADV filings, reproduced without modification. Latest filing: Mar 30, 2026.
View current Form ADV (SEC/IAPD) ↗