Sunriver Management Llc
- Regulatory AUM
- $1.2B
- Discretionary
- $1.2B
- Clients
- 7
- Avg AUM / client
- $171M
- Accounts
- 7
- Employees
- 9
AUM over time
Reported AUM from Form ADV filings, plotted by filing date · as of Mar 30, 2026
Investments (13F portfolio — 18 positions, $591,346,268)
13F period Mar 31, 2026| # | Issuer | Class | Value | Shares | % of 13F | % of AUM |
|---|---|---|---|---|---|---|
| 1 | Aramark | COM | $56,689,068 | 1,398,349 | 9.59% | 4.73% |
| 2 | Ss&C Tech Hldgs | COM | $53,910,657 | 797,849 | 9.12% | 4.49% |
| 3 | Waste Connections Inc | COM | $52,416,627 | 322,683 | 8.86% | 4.37% |
| 4 | Openlane Inc | COM | $44,255,413 | 1,518,196 | 7.48% | 3.69% |
| 5 | Verra Mobility Corp | CL A COM STK | $42,068,574 | 2,943,917 | 7.11% | 3.51% |
| 6 | First Advantage Corp New | COM | $35,664,681 | 3,032,711 | 6.03% | 2.97% |
| 7 | Cdw Corp | COM | $32,476,443 | 268,356 | 5.49% | 2.71% |
| 8 | Wex Inc | COM | $31,173,330 | 203,694 | 5.27% | 2.6% |
| 9 | Huron Consulting Group Inc | COM | $29,809,712 | 233,820 | 5.04% | 2.49% |
| 10 | Performance Food Group Co | COM | $29,570,774 | 345,211 | 5.0% | 2.47% |
| 11 | Live Nation Entertainment In | COM | $26,027,509 | 170,661 | 4.4% | 2.17% |
| 12 | Cbiz Inc | COM | $26,007,742 | 968,631 | 4.4% | 2.17% |
| 13 | Fidelity Natl Information Sv | COM | $25,747,023 | 548,860 | 4.35% | 2.15% |
| 14 | Transunion | COM | $22,957,865 | 331,809 | 3.88% | 1.91% |
| 15 | Cae Inc | COM | $21,996,438 | 844,393 | 3.72% | 1.83% |
| 16 | Lockheed Martin Corp | COM | $21,921,225 | 36,270 | 3.71% | 1.83% |
| 17 | Stanley Black & Decker Inc | COM | $20,823,138 | 293,036 | 3.52% | 1.74% |
| 18 | Bobs Disc Furniture Inc | COM SHS | $17,830,049 | 1,517,451 | 3.02% | 1.49% |
Top 25 of 18 positions from the manager's latest Form 13F · source filing (EDGAR) ↗. 13F covers long US-listed positions only. "% of AUM" is share of the firm's total regulatory AUM (Form ADV Item 5.F).
Who they serve
| Client type | Clients | AUM | % of AUM |
|---|---|---|---|
| Pooled investment vehicles (non-investment companies) | 7 | $1.2B | 100.0% |
Private funds (2)
Reported in Form ADV Section 7.B.(1), filing of Mar 2024 · $1.0B combined gross assets
| Fund | Type | Domicile | Gross assets | Owners |
|---|---|---|---|---|
| Sunriver Master Fund Ltd master | Hedge Fund | Cayman Islands | $856M | 35 |
| Sunriver Long Master Fund Ltd master | Hedge Fund | Cayman Islands | $177M | 22 |
People (2)
| Name | Role / title | Credentials | With firm since | Ownership |
|---|---|---|---|---|
| Cook, Randolph, Willett | Founder And Portfolio Manager | Jun 2015 (11y) | 75% or more of Sunriver Advisors Llc (indirect) | |
| Stadnyk, John, Nmn | Chief Financial Officer And Chief Compliance Officer | Jan 2021 (6y) | Less than 5% |
Entity owners (Schedule A/B)
| Entity | Title / status | Since | Sch. | Ownership |
|---|---|---|---|---|
| Sunriver Global Lp | Managing Member | Aug 2015 | A | 75% or more |
| Sunriver Advisors Llc | General Partner | Jun 2015 | B | GP / trustee / elected manager of Sunriver Global Lp (indirect) |
Undisclosed: 0% – 25% of the firm is not attributable from the filed Schedule A bands.
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 (2, $1.0B gross assets)
| Fund | Type | Gross assets | Min. investment | Owners |
|---|---|---|---|---|
| Sunriver Master Fund Ltd | Hedge Fund | $856M | $5.0M | 35 |
| Sunriver Long Master Fund Ltd | Hedge Fund | $177M | $5.0M | 22 |
From Form ADV Section 7.B private fund reporting.
Documents (1 archived)
| Form | Period | Size | |
|---|---|---|---|
| Form ADV (full filing) | 03/30/2026 | 1.55 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
- • Performance-based fees
Services
- • Portfolio management for pooled investment vehicles
Custody
Firm reports having 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 30, 2026.
View current Form ADV (SEC/IAPD) ↗