Sunriver Management LLC 13F: Quarter-over-Quarter Portfolio Changes
Sunriver Management LLC reported a disclosed portfolio value of approximately $591.3 million in its latest SEC Form 13F-HR filing for Q1 2026, down 38.0% quarter on quarter. Over the quarter, the fund initiated 4 new positions, bought more shares in 6 holdings, trimmed 8 holdings, and exited 9 positions.
Sunriver Management LLC's top buy was a new stake in Waste Connections INC (WCN) , equal to 8.9% of the disclosed portfolio. Its top sell was Box INC (BOX) . The fund exited the position completely after it had accounted for 5.5% of the previous portfolio.
New PositionsQ1 2026
Securities disclosed for the first time in Q1 2026 that were not present in the prior 13F-HR filing.
| Company | Ticker | Initial Portfolio Weight | History |
|---|---|---|---|
| WASTE CONNECTIONS INC | WCN | 8.9% | History → |
| FIDELITY NATL INFORMATION SV | FIS | 4.4% | Holders → |
| CAE INC | CAE | 3.7% | Holders → |
| BOBS DISC FURNITURE INC | BOBS | 3.0% | Holders → |
Top BuysQ1 2026
The fund's top buys among existing positions in Q1 2026. Ranked by portfolio-weight impact, with the percentage of additional shares shown separately.
| Company | Ticker | Portfolio Weight Change | More Shares | History |
|---|---|---|---|---|
| CDW CORP | CDW | +3.1% | +58.8% | History → |
| SS&C TECH HLDGS | SSNC | +3.3% | +26.5% | History → |
| FIRST ADVANTAGE CORP NEW | FA | +2.0% | +14.0% | History → |
| LIVE NATION ENTERTAINMENT IN | LYV | +2.2% | +13.8% | Holders → |
| ARAMARK | ARMK | +4.4% | +3.5% | History → |
| OPENLANE INC | OPLN | +2.8% | +1.3% | History → |
Top SellsQ1 2026
The fund's top sells among positions it retained in Q1 2026. Ranked by portfolio-weight impact. Full exits are listed separately.
| Company | Ticker | Portfolio Weight Change | Shares Sold | History |
|---|---|---|---|---|
| LOCKHEED MARTIN CORP | LMT | -2.8% | 72.0% | Holders → |
| WEX INC | WEX | 0.1% | 38.1% | History → |
| TRANSUNION | TRU | -0.8% | 35.9% | Holders → |
| STANLEY BLACK & DECKER INC | SWK | 0.1% | 32.4% | Holders → |
| PERFORMANCE FOOD GROUP CO | PFGC | 0.7% | 24.0% | History → |
| HURON CONSULTING GROUP INC | HURN | -0.0% | 16.2% | History → |
| CBIZ INC | CBZ | -0.8% | 2.1% | Holders → |
| VERRA MOBILITY CORP | VRRM | 0.2% | 0.4% | History → |
Full ExitsQ1 2026
Positions present in the prior 13F-HR filing that no longer appear in Q1 2026.
| Company | Ticker | Last-Reported Portfolio Weight |
|---|---|---|
| BOX INC | BOX | 5.5% |
| RENTOKIL INITIAL PLC | RTO | 5.2% |
| SYSCO CORP | SYY | 5.0% |
| N-ABLE INC | NABL | 4.8% |
| HUNTINGTON INGALLS INDS INC | HII | 4.1% |
| IQVIA HLDGS INC (IQV) | IQV | 3.9% |
| ACV AUCTIONS INC | ACVA | 2.5% |
| REPAY HLDGS CORP | RPAY | 1.7% |
| CCC INTELLIGENT SOLUTIONS HL | CCC | 1.7% |
Net Portfolio Value ChangeQ1 2026
- $1.0BPrior quarter
- $0.6BCurrent quarter
- $-0.4BNet delta
- -38.0%% change
Methodology & FAQ
How Sunriver Management LLC Quarterly Changes Are Computed
All deltas are sourced from sequential SEC Form 13F-HR filings for Sunriver Management LLC: each row joins the most recent filing against the immediately preceding quarterly filing for the same fund. Share-count changes reflect reported trading activity, while portfolio weights can also move because of market price changes. Portfolio weights are normalized to exclude listed options for comparability. A complete description — including how confidential treatment filings are handled — is documented in the Methodology.
What stocks did Sunriver Management LLC buy in Q1 2026?
In Q1 2026, Sunriver Management LLC initiated 4 new positions (WASTE CONNECTIONS INC (WCN), FIDELITY NATL INFORMATION SV (FIS), CAE INC (CAE), BOBS DISC FURNITURE INC (BOBS)); bought more shares of CDW CORP (CDW), SS&C TECH HLDGS (SSNC), FIRST ADVANTAGE CORP NEW (FA), LIVE NATION ENTERTAINMENT IN (LYV), ARAMARK (ARMK) — the largest 5 of 6 adds.
What stocks did Sunriver Management LLC sell in Q1 2026?
In Q1 2026, Sunriver Management LLC fully sold 9 positions (BOX INC (BOX), RENTOKIL INITIAL PLC (RTO), SYSCO CORP (SYY), N-ABLE INC (NABL), HUNTINGTON INGALLS INDS INC (HII), IQVIA HLDGS INC (IQV) (IQV), ACV AUCTIONS INC (ACVA), REPAY HLDGS CORP (RPAY), CCC INTELLIGENT SOLUTIONS HL (CCC)); reduced holdings in LOCKHEED MARTIN CORP (LMT), WEX INC (WEX), TRANSUNION (TRU), STANLEY BLACK & DECKER INC (SWK), PERFORMANCE FOOD GROUP CO (PFGC) — the largest 5 of 8 reductions.
Which positions did Sunriver Management LLC initiate in Q1 2026?
Sunriver Management LLC established 4 new positions in Q1 2026: WASTE CONNECTIONS INC (WCN, 8.9%), FIDELITY NATL INFORMATION SV (FIS, 4.4%), CAE INC (CAE, 3.7%), BOBS DISC FURNITURE INC (BOBS, 3.0%).
Which existing positions saw the largest allocation increases for Sunriver Management LLC in Q1 2026?
Of 6 existing positions with share-count increases in Q1 2026, the largest were: CDW CORP (CDW, +3.1% weight, +58.8% shares), SS&C TECH HLDGS (SSNC, +3.3% weight, +26.5% shares), FIRST ADVANTAGE CORP NEW (FA, +2.0% weight, +14.0% shares), LIVE NATION ENTERTAINMENT IN (LYV, +2.2% weight, +13.8% shares), ARAMARK (ARMK, +4.4% weight, +3.5% shares), OPENLANE INC (OPLN, +2.8% weight, +1.3% shares).
Which positions did Sunriver Management LLC fully exit in Q1 2026?
Sunriver Management LLC fully exited 9 positions in Q1 2026: BOX INC (BOX, last-reported weight 5.5%), RENTOKIL INITIAL PLC (RTO, last-reported weight 5.2%), SYSCO CORP (SYY, last-reported weight 5.0%), N-ABLE INC (NABL, last-reported weight 4.8%), HUNTINGTON INGALLS INDS INC (HII, last-reported weight 4.1%), IQVIA HLDGS INC (IQV) (IQV, last-reported weight 3.9%), ACV AUCTIONS INC (ACVA, last-reported weight 2.5%), REPAY HLDGS CORP (RPAY, last-reported weight 1.7%), CCC INTELLIGENT SOLUTIONS HL (CCC, last-reported weight 1.7%).
Which existing positions saw the largest allocation reductions for Sunriver Management LLC in Q1 2026?
Of 8 existing positions with share-count reductions in Q1 2026, the largest were: LOCKHEED MARTIN CORP (LMT, -2.8% weight, -72.0% shares), WEX INC (WEX, 0.1% weight, -38.1% shares), TRANSUNION (TRU, -0.8% weight, -35.9% shares), STANLEY BLACK & DECKER INC (SWK, 0.1% weight, -32.4% shares), PERFORMANCE FOOD GROUP CO (PFGC, 0.7% weight, -24.0% shares), HURON CONSULTING GROUP INC (HURN, -0.0% weight, -16.2% shares), CBIZ INC (CBZ, -0.8% weight, -2.1% shares), VERRA MOBILITY CORP (VRRM, 0.2% weight, -0.4% shares).
Do quarter-over-quarter 13F allocation changes constitute explicit trading signals?
No. Quarter-over-quarter changes reflect a combination of active trading and market price movement. A weight increase can result from price appreciation alone, without the manager adding shares. Share-count delta is the cleaner indicator of explicit trading activity. All deltas on this page are sourced from sequential SEC Form 13F-HR filings.