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Livermore
Livermore
ZHEN

Sunriver Management LLC

SEC CIK
0001663900
Latest filing
Aug 13, 2026

The latest 13F from Sunriver Management LLC covers Q2 2026 (filed Aug 13, 2026): 21 long positions worth $636.8M. The top 10 holdings make up 62.8% of the portfolio, and the largest is Aramark (ARMK) at 9.4%. Livermore has 23 filings on Form 13F from this institution, going back to Q1 2021.

What changed in Q2 2026

Share counts compared with Q1 2026: how many positions were new, added to, reduced or sold out, and the biggest buys and sells. Dollar amounts are estimated at the quarter-end prices implied by the filing.

Full comparison
New
11
Est. +$277.4M
Added
6
Est. +$10.3M
Reduced
4
Est. −$53.3M
Sold out
8
Est. −$236.3M

Top 5 holdings

Share of this quarter's portfolio value

  1. ARMKAramark
    9.4%$60.1MHistory
  2. WCNWaste Connections, Inc.
    9.0%$57.3MHistory
  3. SSNCSS&C Technologies Holdings Inc
    7.9%$50.5MHistory
  4. DGDollar General Corp
    6.0%$38.3MHistory
  5. FAFirst Advantage Corp
    5.5%$35.0MHistory

Biggest buys

New and added positions, by estimated amount bought

  1. DGDollar General Corp
    +$38.3MNewHistory
  2. BKNGBooking Holdings Inc.
    +$34.7MNewHistory
  3. LIILennox International Inc
    +$33.8MNewHistory
  4. CNMCore & Main, Inc.
    +$29.9MNewHistory
  5. GPCGenuine Parts Co
    +$28.5MNewHistory

Largest weight increases

New and added positions, by percentage points of the portfolio gained

  1. DGDollar General Corp
    +6.02 pp0.0% → 6.0%History
  2. BKNGBooking Holdings Inc.
    +5.44 pp0.0% → 5.4%History
  3. LIILennox International Inc
    +5.31 pp0.0% → 5.3%History
  4. CNMCore & Main, Inc.
    +4.70 pp0.0% → 4.7%History
  5. GPCGenuine Parts Co
    +4.48 pp0.0% → 4.5%History

Biggest sells

Reduced and sold-out positions, by estimated amount sold

  1. OPLNOPENLANE, Inc.
    −$44.3MSold outHistory
  2. VRRMVerra Mobility Corp
    −$42.1MSold outHistory
  3. CDWCDW Corp
    −$32.5MSold outHistory
  4. CBZCBIZ, Inc.
    −$26.0MSold outHistory
  5. FISFidelity National Information Services, Inc.
    −$25.7MSold outHistory

Largest weight decreases

Reduced and sold-out positions, by percentage points of the portfolio lost

  1. OPLNOPENLANE, Inc.
    −7.48 pp7.5% → 0.0%History
  2. VRRMVerra Mobility Corp
    −7.11 pp7.1% → 0.0%History
  3. CDWCDW Corp
    −5.49 pp5.5% → 0.0%History
  4. CBZCBIZ, Inc.
    −4.40 pp4.4% → 0.0%History
  5. FISFidelity National Information Services, Inc.
    −4.35 pp4.4% → 0.0%History

Metrics

13F metrics for Q2 2026, computed only from the numbers in the filings. Definitions below.

Portfolio value
$636.8M
+$45.5M (+7.7%) vs. prior quarter
Positions
21
+3 vs. prior quarter
Top 10 concentration
62.8%
Top 10 as share of value
Turnover
46.8%
Q2 2026, one quarter
Average holding period
3.8 quarters
Weighted by value

How these are calculated

  • Portfolio value: the market value of all long positions in the 13F, as reported at quarter end, excluding options.
  • Top 10 concentration: the combined value of the 10 largest positions as a share of portfolio value.
  • Turnover: the smaller of this quarter's estimated purchases and estimated sales, divided by the average of this and last quarter's portfolio value. Estimates multiply the change in shares by the quarter-end price implied by the filing (market value divided by shares); new positions use this quarter's value and sold-out positions last quarter's. Only positions reported in shares count, and it is not calculated when the previous quarter was not filed.
  • Average holding period: how many consecutive quarters each current position has been held (including this one; a quarter without the position or without a filing starts the count over), weighted by this quarter's value. Counting starts with the first 13F in Livermore (Q1 2021), so positions held before then are understated.

13F filings by quarter

22 quarters, going back to Q1 2021. Bars show each quarter's 13F portfolio value; quarters without a filing are left blank.

Peak $953.9M (Q4 2025)

Q1 2021: $534.8MQ2 2021: $587.7MQ3 2021: $629.2MQ4 2021: $633.6MQ1 2022: $635.3MQ2 2022: $631.2MQ3 2022: $581.1MQ4 2022: $487.0MQ1 2023: $479.5MQ2 2023: $495.7MQ3 2023: $528.9MQ4 2023: $638.3MQ1 2024: $765.2MQ2 2024: $790.0MQ3 2024: $813.5MQ4 2024: $835.7MQ1 2025: $810.3MQ2 2025: $932.6MQ3 2025: $920.0MQ4 2025: $953.9MQ1 2026: $591.3MQ2 2026: $636.8M
Q1 2021Q2 2026
13F filings of Sunriver Management LLC by quarter
QuarterFiledPositionsValueTop 3 holdingsChangesFiling
Q2 2026Aug 13, 202621$636.8MARMKWCNSSNCvs. Q1 2026SEC
Q1 2026May 14, 202618$591.3MARMKSSNCWCNvs. Q4 2025SEC
Q4 2025Feb 13, 202623$953.9MVRRMLMTSSNCvs. Q3 2025SEC
Q3 2025Nov 13, 202521$920.0MIASHURNVRRMvs. Q2 2025SEC
Q2 2025Aug 13, 202523$932.6MIASPFGCOPLNvs. Q1 2025SEC
Q1 2025May 14, 202522$810.3MIASPFGCWEXvs. Q4 2024SEC
Q4 2024Feb 13, 202519$835.7MPFGCIASDNBvs. Q3 2024SEC
Q3 2024Nov 13, 202417$813.5MIASPFGCDNBvs. Q2 2024SEC
Q2 2024Aug 13, 202420$790.0MDNBIASPFGCvs. Q1 2024SEC
Q1 2024May 14, 202420$765.2MIASDNBPFGCvs. Q4 2023SEC
Q4 2023Feb 13, 202422$638.3MPFGCBOXSSNCvs. Q3 2023SEC
Q3 2023Nov 14, 202319$528.9MPFGCDNBIASvs. Q2 2023SEC
Q2 2023Aug 14, 202317$495.7MPFGCNEWRDNBvs. Q1 2023SEC
Q1 2023May 15, 202317$479.5MNEWRSSNCRCMvs. Q4 2022SEC
Q4 2022Feb 13, 202315$487.0MFISVSSNCRCMvs. Q3 2022SEC
Q3 2022Nov 14, 202217$581.1MFISVSSNCDNBvs. Q2 2022SEC
Q2 2022Aug 15, 2022Amended18$631.2MFISVDNBSSNCvs. Q1 2022SEC
Q1 2022May 13, 202220$635.3MSSNCFISVDNBvs. Q4 2021SEC
Q4 2021Feb 11, 202217$633.6MSSNCDNBFISVvs. Q3 2021SEC
Q3 2021Nov 15, 202121$629.2MSSNCFISVSAICvs. Q2 2021SEC
Q2 2021Aug 16, 202120$587.7MSSNCDNBSAICvs. Q1 2021SEC
Q1 2021May 17, 202119$534.8MSSNCBOXSEIC–SEC

13D and 13G filings

Companies where Sunriver Management LLC reports owning 5% or more on Schedule 13D or 13G, and its latest filings.

Current stakes of 5% or more

Sunriver Management LLC does not currently report owning 5% or more of any company.

Latest filings

7 filings on file made by Sunriver Management LLC or listing it as a reporting person, newest first.

Schedule 13D and 13G filings by Sunriver Management LLC
CompanyFiled (ET)FormStakeChangeEvent dateFiling
IASIntegral Ad Science Holding Corp.Nov 13, 20255:56 PM ET13G/A4.30%7.12M shares−1.00 ppfrom 5.30%Below 5%Sep 30, 2025SEC
RPAYRepay Holdings CorpAug 13, 20259:03 PM ET13G/A3.90%3.72M shares–Below 5%Jun 30, 2025SEC
IASIntegral Ad Science Holding Corp.Aug 13, 20258:43 PM ET13G5.30%8.82M sharesNewJun 30, 2025SEC
RPAYRepay Holdings CorpNov 14, 202413GOld format–New–SEC
NeoGames S.A.Feb 12, 202413G/AOld format–––SEC
NeoGames S.A.Feb 14, 202313G/AOld format–––SEC
NeoGames S.A.May 23, 202213GOld format–New–SEC