Blackstone Isg-I Advisors L.L.C. is an SEC-registered investment adviser based in New York, NY.
Form ADVIt reports 6 private funds on Form ADV, 4 of them private equity. The largest is Blackstone Holdings Partners L.P.fund, at $533M.
Form ADVIts website lists 11 deals, the latest Moisescompany on Oct 21, 2026 (the deal).
WebsiteIts website lists 3 portfolio companies, all current, among them Moisescompany and Nina Protocolcompany.
WebsiteSEC filings name 6 people, including Panayiota K. Bougiamas, Chief Compliance Officer.
Form ADV
Funds
first 2 of 6CSV
| Fund | Type | Gross assets | Owners | Source |
|---|---|---|---|---|
| Blackstone Holdings Partners L.P. | Private equity | $533M | 1 | Form ADV |
| Arrow PTF LP | Other private | $211M | 1 | Form ADV |
4 more funds
$278M in gross assets between them.
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Deals
first 2 of 11CSV
| Date | Deal | Its role | Source |
|---|---|---|---|
| Oct 21, 2026 | Moises · Partnership | Buyer | Website |
| Oct 9, 2026 | Riot Games · Partnership | Buyer | Website |
9 more deals
Going back to 2022.
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Portfolio companies
first 2 of 3CSV
| Company | Sector | Status | Source |
|---|---|---|---|
| Moises | AI-supported music creation | Current | Website |
| Nina Protocol | independent music culture | Current | Website |
People
first 2 of 6CSV
| Name | Title | Source |
|---|---|---|
| Panayiota K. Bougiamas | Chief Compliance Officer | Form ADV |
| Gilles Maurice Dellaert | Global Head of Blackstone Credit and Insurance | Form ADV |
4 more people
2 partners, principals and managing directors among them.
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