Sunriver Management LLC

Hedge Fund • Long/Short

Sunriver Management LLC is a Long/Short Hedge Fund based in Greenwich, CT led by Randolph Willett Cook, reporting $1.2B in AUM as of Q3 2025 with 34% Industrials concentration and 58% concentrated in top 10 holdings.

FounderRandolph Willett Cook

Portfolio Value: $920.0M
Positions: 21
Top Holding: IAS at 7.87%
Last Reported: Q3 2025

Address2 Sound View Drive, 2nd Floor, Greenwich, CT, 06830, United States

Top Holdings

Largest long holdings in Sunriver Management LLC's portfolio (57.6% of total portfolio)

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Holding	Sector	Position	Weight	Traded	Ownership	Owned Since
1 Integral Ad Science IAS	Advertising Agencies Communication Services	$72.4M	7.87%	-$17.3M Sold	4.27% 7.1M shares	Q1 2023 Held for 2y 8m
2 Huron Consulting Group HURN	Consulting Services Industrials	$66.3M	7.21%	+$10.8M Bought	2.61% 452.0K shares	Q2 2024 Held for 1y 5m
3 Verra Mobility VRRM	Industrial - Infrastructure Operations Industrials	$56.4M	6.13%	+$5.4M Bought	1.43% 2.3M shares	Q4 2024 Held for 11 months
4 RTO Rentokil Initial RTO	Unknown Unknown	$50.1M	5.45%	-$1.8M Sold	— 2.0M shares	Q1 2025 Held for 8 months
5 Box BOX	Software - Infrastructure Technology	$49.0M	5.32%	+$11.6M Bought	1.05% 1.5M shares	Q4 2020 Held for 4y 11m
6 WEX WEX	Software - Infrastructure Technology	$48.5M	5.28%	-$5.2M Sold	0.90% 308.1K shares	Q3 2024 Held for 1y 2m
7 N-able NABL	Information Technology Services Technology	$48.5M	5.27%	-$1.5M Sold	3.32% 6.2M shares	Q3 2021 Held for 4y 2m
8 Performance Food Group PFGC	Food Distribution Consumer Defensive	$48.2M	5.24%	-$20.0M Sold	0.30% 463.1K shares	Q4 2021 Held for 3y 11m
9 Sysco SYY	Food Distribution Consumer Defensive	$45.8M	4.98%	+$45.8M Bought	0.12% 556.3K shares	Q1 2025 Held for 8 months
10 SS&C Technologies SSNC	Software - Application Technology	$45.0M	4.89%	+$2.0M Bought	0.21% 507.0K shares	Q3 2019 Held for 6y 2m

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Changes

Portfolio activity, position movements, and quarter-over-quarter changes in Sunriver Management LLC's latest filing

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Market Value

$920.0M

Prior: $932.6M

Q/Q Change

-1.35%

-$12.6M

Net Flows % of MV

-11.23%

Turnover Ratio

25.09%

New Purchases

2 stocks

$75.1M

Added To

8 stocks

+$81.2M

Sold Out Of

5 stocks

$166.3M

Reduced Holdings

10 stocks

-$93.2M

Increased Positions

Position	Shares Δ	Change
1 IQVIA IQV	New	0 → 229.1K +$43.5M
2 CBIZ CBZ	New	0 → 596.8K +$31.6M
3 Stanley Black & Decker SWK	+299.73%	142.0K → 567.5K +$31.6M
4 First Advantage Corporation FA	+46.12%	1.6M → 2.4M +$11.4M
5 Box BOX	+31.02%	1.2M → 1.5M +$11.6M

Decreased Positions

Position	Shares Δ	Change
1 Fiserv FI	Sold	274.0K → 0 −$47.2M
2 Fidelity National Information Services FIS	Sold	552.4K → 0 −$45.0M
3 Amplitude, Inc. AMPL	Sold	3.3M → 0 −$41.4M
4 Willis Towers Watson WTW	Sold	78.5K → 0 −$24.0M
5 Paysafe PSFE	Sold	688.4K → 0 −$8.7M