Cion Grosvenor Management, Llc
SEC-registered
Mutual Fund / Asset Manager · Small ($100M–$1B)
CRD 330199
· SEC file 801-130219
· New York, NY
· cioninvestments.com
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ADV data as of Mar 31, 2026
- Regulatory AUM
- $335M
- Discretionary
- $335M
- Clients
- 2
- Avg AUM / client
- $168M
- Accounts
- 2
- Employees
- 5
AUM over time
$0
$335M
Dec 2023
Dec 2025
Annual snapshots from Form ADV filings · as of Mar 31, 2026
Who they serve
| Client type | Clients | AUM | % of AUM |
|---|---|---|---|
| Investment companies | 2 | $335M | 100.0% |
People (6)
| Name | Role / title | Credentials | With firm since | Ownership |
|---|---|---|---|---|
| Sacks, Michael, Jay | Trustee | Dec 1995 (31y) | GP / trustee / elected manager of Michael J. Sacks Revocable Trust (indirect) | |
| Gatto, Mark | Co Ceo, Director | Dec 2022 (4y) | ≈ 3.96% – 37.5% via Gatto Living Trust | |
| Reisner, Michael, Adam | Co Ceo, Director | Feb 2024 (3y) | ≈ 3.96% – 37.5% via Michael Reisner Revocable Living Trust | |
| Quinn, Patrick, Thomas | Chief Legal Officer | Mar 2024 (2y) | Less than 5% | |
| Roman, Stephen | Chief Compliance Officer | Mar 2024 (2y) | Less than 5% | |
| Schill, Gregory, Michael | Vice President | Mar 2024 (2y) | Less than 5% |
Entity owners (Schedule A/B)
| Entity | Title / status | Since | Sch. | Ownership |
|---|---|---|---|---|
| Cion Jv Spv 1, Llc | Member | Mar 2024 | A | 75% or more |
| Gcm Jv Holding, Llc | Member | Mar 2024 | A | 25% – 50% |
| Grosvenor Capital Management Holdings, Lllp | Sole Member | Mar 2024 | B | ≈ 18.75% – 50% via Gcm Jv Holding, Llc |
| Cion Jv Holdings, Llc | Sole Member | Mar 2024 | B | ≈ 56.25% – 100% via Cion Jv Spv 1, Llc |
| Gcm Grosvenor Inc. | Sole Member | Nov 2020 | B | 75% or more of Gcm Grosvenor Holdings, Llc (indirect) |
| Cion Investment Group, Llc | Sole Member | Dec 2023 | B | ≈ 42.19% – 100% via Cion Jv Holdings, Llc |
| Grosvenor Holdings, L.L.C. | Limited Partner | Dec 2005 | B | ≈ 9.38% – 37.5% via Grosvenor Capital Management Holdings, Lllp |
| Warrenton Capital Corp. | Member Series B | Jan 2020 | B | ≈ 21.09% – 75% via Cion Investment Group, Llc |
| Michael J. Sacks Revocable Trust | Member | Nov 2001 | B | ≈ 2.34% – 18.75% via Grosvenor Holdings, L.L.C. |
| Gatto Living Trust | Shareholder | Feb 2024 | B | ≈ 5.27% – 37.5% via Warrenton Capital Corp. |
| Michael Reisner Revocable Living Trust | Shareholder | Feb 2024 | B | ≈ 5.27% – 37.5% via Warrenton Capital Corp. |
| Mjs Llc | Managing Member | Jul 2005 | B | GP / trustee / elected manager of Grosvenor Holdings, L.L.C. (indirect) |
| Gcm Grosvenor Holdings, Llc | Sole General Partner | Nov 2020 | B | GP / trustee / elected manager of Grosvenor Capital Management Holdings, Lllp (indirect) |
Estimated effective ownership (look-through of filed bands):
- Gatto, Mark: 75% – 100% of Gatto Living Trust × 25% – 50% of Warrenton Capital Corp. × 50% – 75% of Cion Investment Group, Llc × 75% – 100% of Cion Jv Holdings, Llc × 75% – 100% of Cion Jv Spv 1, Llc × 75% – 100% direct ≈ 3.96% – 37.5% of the firm
- Reisner, Michael, Adam: 75% – 100% of Michael Reisner Revocable Living Trust × 25% – 50% of Warrenton Capital Corp. × 50% – 75% of Cion Investment Group, Llc × 75% – 100% of Cion Jv Holdings, Llc × 75% – 100% of Cion Jv Spv 1, Llc × 75% – 100% direct ≈ 3.96% – 37.5% of the firm
- Grosvenor Capital Management Holdings, Lllp: 75% – 100% of Gcm Jv Holding, Llc × 25% – 50% direct ≈ 18.75% – 50% of the firm
- Cion Jv Holdings, Llc: 75% – 100% of Cion Jv Spv 1, Llc × 75% – 100% direct ≈ 56.25% – 100% of the firm
- Cion Investment Group, Llc: 75% – 100% of Cion Jv Holdings, Llc × 75% – 100% of Cion Jv Spv 1, Llc × 75% – 100% direct ≈ 42.19% – 100% of the firm
- Grosvenor Holdings, L.L.C.: 50% – 75% of Grosvenor Capital Management Holdings, Lllp × 75% – 100% of Gcm Jv Holding, Llc × 25% – 50% direct ≈ 9.38% – 37.5% of the firm
- Warrenton Capital Corp.: 50% – 75% of Cion Investment Group, Llc × 75% – 100% of Cion Jv Holdings, Llc × 75% – 100% of Cion Jv Spv 1, Llc × 75% – 100% direct ≈ 21.09% – 75% of the firm
- Michael J. Sacks Revocable Trust: 25% – 50% of Grosvenor Holdings, L.L.C. × 50% – 75% of Grosvenor Capital Management Holdings, Lllp × 75% – 100% of Gcm Jv Holding, Llc × 25% – 50% direct ≈ 2.34% – 18.75% of the firm
- Gatto Living Trust: 25% – 50% of Warrenton Capital Corp. × 50% – 75% of Cion Investment Group, Llc × 75% – 100% of Cion Jv Holdings, Llc × 75% – 100% of Cion Jv Spv 1, Llc × 75% – 100% direct ≈ 5.27% – 37.5% of the firm
- Michael Reisner Revocable Living Trust: 25% – 50% of Warrenton Capital Corp. × 50% – 75% of Cion Investment Group, Llc × 75% – 100% of Cion Jv Holdings, Llc × 75% – 100% of Cion Jv Spv 1, Llc × 75% – 100% direct ≈ 5.27% – 37.5% 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.
Documents (1 archived)
| Form | Period | Size | |
|---|---|---|---|
| Form ADV (full filing) | 03/31/2026 | 1.17 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 investment companies
Custody
Firm reports it does not have custody of client funds or securities (Item 9.A).
No custodian data reported or mined yet.
Source
All data on this page comes from this firm's Form ADV filings, reproduced without modification. Latest filing: Mar 31, 2026.
View current Form ADV (SEC/IAPD) ↗