Q2 2026 13F · SEC CIK 1663900
Sunriver Management LLC
Investment managerFiled 2026-08-13 for Q2 2026. Open the filing ↗ · All SEC filings ↗
- Reported 13F value
- $636.8M
- Reported positions
- 21
- Top holdings a year, 3 yrs
- +5.0%
- Average holding period
- 4 qtrs
Sunriver Management LLC is an investment manager that reported 21 positions worth $636.8M in its Q2 2026 13F, filed 2026-08-13. Its largest holdings were Aramark (ARMK, 9.4%), Waste Connections Inc (WCN, 9.0%), Ss&c Tech Hldgs (SSNC, 7.9%). A portfolio copying its top holdings returned 5.0% a year over the last 3 years, against 20.4% for the S&P 500.
Sunriver Management LLC holdings all 21 positions.
Weights are shares of the filer's total reported 13F value, compared with Q1 2026. Share changes may reflect splits; weight changes also reflect price moves. A 13F shows long US-listed positions only, up to 135 days after the fact.
| Stock | % of 13F value | Share change | Reported value |
|---|---|---|---|
| ARMKAramark | 9.4% | -24.4% | $60.1M |
| WCNWaste Connections Inc | 9.0% | +6.5% | $57.3M |
| SSNCSs&c Tech Hldgs | 7.9% | +1.9% | $50.5M |
| DGDollar Gen Corp | 6.0% | — | $38.3M |
| FAFirst Advantage Corp | 5.5% | -36.0% | $35.0M |
| BKNGBooking Holdings Inc | 5.4% | — | $34.7M |
| LIILennox Intl Inc | 5.3% | — | $33.8M |
| LYVLive Nation Entertainment in | 5.0% | +2.4% | $32.0M |
| CNMCore & Main Inc | 4.7% | — | $29.9M |
| WEXWex Inc | 4.5% | -0.6% | $28.6M |
| GPCGenuine Parts Co | 4.5% | — | $28.5M |
| BOBSBobs Disc Furniture Inc | 4.0% | +6.5% | $25.6M |
| PFGCPerformance Food Group Co | 3.9% | -36.1% | $24.6M |
| CAECae Inc | 3.9% | +16.0% | $24.5M |
| MGRCMcgrath Rentcorp Com | 3.8% | — | $24.0M |
| NSPInsperity Inc Com | 3.4% | — | $21.4M |
| HURNHuron Consulting Group Inc | 3.3% | +0.8% | $21.2M |
| ROADConstruction Partners Inc | 3.3% | — | $20.8M |
| WAYWaystar Hldg Corp | 2.8% | — | $17.6M |
| SOLSSolstice Advanced Matls Inc | 2.7% | — | $17.4M |
| KFYKorn-Ferry Com | 1.7% | — | $10.9M |
What Sunriver Management LLC bought and sold in Q2 2026, against Q1 2026.
New positions
- DG Dollar Gen Corp6.0% of 13F
- BKNG Booking Holdings Inc5.4% of 13F
- LII Lennox Intl Inc5.3% of 13F
- CNM Core & Main Inc4.7% of 13F
- GPC Genuine Parts Co4.5% of 13F
- MGRC Mcgrath Rentcorp Com3.8% of 13F
- NSP Insperity Inc Com3.4% of 13F
- ROAD Construction Partners Inc3.3% of 13F
Added to
- CAE Cae Inc+16.0% shares
- BOBS Bobs Disc Furniture Inc+6.5% shares
- WCN Waste Connections Inc+6.5% shares
Reduced
- PFGC Performance Food Group Co-36.1% shares
- FA First Advantage Corp-36.0% shares
- ARMK Aramark-24.4% shares
Sold out
- KAR Openlane Incwas 7.5%
- VRRM Verra Mobility Corpwas 7.1%
- CDW Cdw Corp/dewas 5.5%
- CBZ Cbiz Incwas 4.4%
- FIS Fidelity Natl Information Svwas 4.4%
- TRU Transunionwas 3.9%
- LMT Lockheed Martin Corpwas 3.7%
- SWK Stanley Black & Decker Incwas 3.5%
Share counts compared with the Q1 2026 13F; a split also changes share counts.
How the holdings did against the S&P 500.
- 1 year
- +4.5% /yr
- S&P 500 +20.1%
- 3 years
- +5.0% /yr
- S&P 500 +20.4%
- 5 years
- +1.0% /yr
- S&P 500 +11.6%
A portfolio of the filer's 20 largest 13F positions, weighted by value, bought the trading day after each 13F was filed and held until the next one was: what copying this filer could have earned. 13Fs show long US-listed positions only, so this is an estimate of the stock picks, not the fund's reported returns.
Reported 13F value by quarter.
| Quarter | 13F value | Positions |
|---|---|---|
| Q2 2026 | $636.8M | 21 |
| Q1 2026 | $591.3M | 18 |
| Q4 2025 | $953.9M | 23 |
| Q3 2025 | $920.0M | 21 |
| Q2 2025 | $932.6M | 23 |
| Q1 2025 | $810.3M | 22 |
| Q4 2024 | $835.7M | 19 |
| Q3 2024 | $813.5M | 17 |
| Q2 2024 | $790.0M | 20 |
| Q1 2024 | $765.2M | 20 |
| Q4 2023 | $638.3M | 22 |
| Q3 2023 | $528.9M | 19 |
Questions about Sunriver Management LLC's portfolio
What stocks does Sunriver Management LLC own?
Sunriver Management LLC's latest 13F, for Q2 2026 and filed Aug 13, 2026, lists 21 positions worth $636.8M. The largest are Aramark (ARMK) at 9.4%, Waste Connections Inc (WCN) at 9.0%, Ss&c Tech Hldgs (SSNC) at 7.9%, Dollar Gen Corp (DG) at 6.0% and First Advantage Corp (FA) at 5.5%.
What did Sunriver Management LLC buy last quarter?
In Q2 2026, Sunriver Management LLC added a new position in Dollar Gen Corp (DG), a new position in Booking Holdings Inc (BKNG), a new position in Lennox Intl Inc (LII), a new position in Core & Main Inc (CNM), a new position in Genuine Parts Co (GPC), Cae Inc (CAE) (+16.0% shares), Bobs Disc Furniture Inc (BOBS) (+6.5% shares) and Waste Connections Inc (WCN) (+6.5% shares), compared with its Q1 2026 filing.
What did Sunriver Management LLC sell last quarter?
In Q2 2026, Sunriver Management LLC sold all of Openlane Inc (KAR), sold all of Verra Mobility Corp (VRRM), sold all of Cdw Corp/de (CDW), sold all of Cbiz Inc (CBZ), sold all of Fidelity Natl Information Sv (FIS), Performance Food Group Co (PFGC) (-36.1% shares), First Advantage Corp (FA) (-36.0% shares) and Aramark (ARMK) (-24.4% shares), compared with its Q1 2026 filing.
How has Sunriver Management LLC's portfolio performed?
A portfolio copying Sunriver Management LLC's 20 largest 13F holdings each quarter, from the day each filing was public, returned +5.0% a year over the last 3 years, against +20.4% for the S&P 500. Over 1 year: +4.5% against +20.1%. Over 5 years: +1.0% a year against +11.6%.
When is Sunriver Management LLC's next 13F filing due?
13F filings are due 45 days after each quarter ends. Sunriver Management LLC's filing for the quarter ending Sep 30, 2026 is due by Nov 14, 2026; this page updates the day after it is published.