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RIA / WealthRegistered adviserasset managerSEC registeredRAUM 1b 10b

SUNRIVER MANAGEMENT LLC

CRD 281277

GREENWICH, CT

This is the graph view. The full profile, with its team, deals and sources, is on RIA / Wealth Management.Open the full profile →

Search this name across graphsid dfx:ria:9b34f0fe-7132-38ec-8805-a4076efdfc84

Data as of Mar 30, 2026 (this record's last observation) from federal regulator filings. Page built Sep 20, 2026, 11:26 AM UTC and rebuilt at most every 15 minutes.

Relationships: 8
Dated events: 5
On other graphs: 0
Observed: Sep 4, 2015 to Mar 30, 2026
16 observations

Across DFX

This entity has not been resolved onto another DFX graph by a shared identifier. A name match elsewhere would be a candidate, never an identity, and none is recorded.

Facts

fact = as filed or announced; derived = computed by DFX; estimate = a band, never a point

Firm class: asset managerderivedprivate_client_share=0.0 fund_share=1.0 institutional_share=0.0 related_bd=false related_bank=true bd_reps=0.0
Regulatory AUM: $1.2BItem 5.F on the latest filing (2026-03-30); as reported, and an affiliate's assets may be counted again on its own filing
Discretionary RAUM: $1.2B
Private client RAUM: $0derivedItem 5.D individuals plus high net worth individuals
Private client share: 0%derivedprivate client RAUM over total RAUM
Advisors on IAPD: 0
Employees: 9
Advisory employees: 5
Offices: 0Schedule D 1.F, beyond the principal office
Accounts: 7
Private funds: 2Schedule D 7.B(1)
Custody, client assets: $1.2B
SEC number: 801-106651
CIK: 1663900
CRD: 281277
Filings on the tape: 16
First filed: Sep 4, 2015
Latest filed: Mar 30, 2026
Organised: Limited Liability Company, DE

Private funds

Schedule D 7.B(1); gross asset value as reported, never fund size; reporting ends 2024-12-31

Fund	Type	Reported GAV	As of	Owners	First reported	Status	Form D file
SUNRIVER MASTER FUND LTD	Hedge Fund	$856M	Mar 26, 2024	35	Jan 13, 2016	reported	021-262009
SUNRIVER LONG MASTER FUND LTD	Hedge Fund	$177M	Mar 26, 2024	22	Mar 30, 2020	reported	021-371094

Owners and control persons

Schedule A and B as filed; ownership codes are the form's bands (NA under 5%, A 5 to 10%, B 10 to 25%, C 25 to 50%, D 50 to 75%, E over 75%); people are listed as filed and never merged by name

Owner	Title	Ownership code	Control person	Acquired	First seen	Last seen
COOK, RANDOLPH, WILLETT	MANAGING MEMBER	E	yes	07/2015	Sep 4, 2015	Mar 26, 2024
COOK, RANDOLPH, WILLETT	LIMITED PARTNER	E	yes	07/2015	Sep 4, 2015	Mar 26, 2024
COOK, RANDOLPH, WILLETT	FOUNDER AND PORTFOLIO MANAGER	Na	yes	06/2015	Sep 4, 2015	Mar 26, 2024
STADNYK, JOHN, NMN	CHIEF FINANCIAL OFFICER AND CHIEF COMPLIANCE OFFICER	Na	yes	01/2021	Mar 30, 2021	Mar 26, 2024
SUNRIVER ADVISORS LLC	GENERAL PARTNER	F	yes	06/2015	Sep 4, 2015	Mar 26, 2024
SUNRIVER GLOBAL LP	MANAGING MEMBER	E	yes	08/2015	Sep 4, 2015	Mar 26, 2024

Affiliates (Item 7.A)

as filed on Item 7.A; a related person with a CRD on the graph links to its own page

Related person	Type	Class on the graph	Its RAUM	Control	Common control	State
SUNRIVER GP LLC	n/a	n/a	n/a	N	yes	n/a

Regulatory AUM by fiscal year

annual amendments (and the roster's annual snapshot) as filed; where a year was amended twice the later filing draws the line

Fiscal year	Filed	RAUM	Discretionary	Employees	Advisory staff	Offices	Private funds	Fund GAV
2025	Mar 30, 2026	$1.2B	$1.2B	9	5	0	2	n/a
2024	Mar 28, 2025	$1.2B	$1.2B	11	6	0	2	n/a
2023	Mar 26, 2024	$1.0B	$1.0B	10	5	0	2	$1.0B
2022	Mar 28, 2023	$806M	$806M	11	5	0	2	$806M
2021	Mar 25, 2022	$935M	$935M	11	5	0	2	$935M
2020	Mar 30, 2021	$688M	$688M	10	5	0	2	$688M
2019	Mar 30, 2020	$819M	$819M	11	5	0	2	$819M
2018	Mar 26, 2019	$728M	$728M	10	5	1	1	$728M
2017	Mar 30, 2018	$707M	$707M	10	5	1	1	$707M
2016	Mar 23, 2017	$683M	$683M	10	5	n/a	1	$683M
2015	Mar 25, 2016	$386M	$386M	7	4	n/a	1	$386M

Growth

derived from consecutive annual filings; RAUM as reported

Latest fiscal year	RAUM	A year earlier	1y change	Three years earlier	3y CAGR	Employees	A year earlier	Offices	A year earlier
2025	$1.2B	$1.2B	-2.3%	$806M	14.2%	9	11	0	0

Relationships

Advises (2)

→ SUNRIVER MASTER FUND LTDPrivate fundHedge Fund, IA
Jan 13, 2016 to presentfactForm ADV
→ SUNRIVER LONG MASTER FUND LTDPrivate fundHedge Fund, IA
Mar 30, 2020 to presentfactForm ADV

Controls (4)

← COOK, RANDOLPH, WILLETTOwnerMANAGING MEMBER, ownership code E, individual
Sep 4, 2015 to Mar 26, 2024factForm ADV
← STADNYK, JOHN, NMNOwnerCHIEF FINANCIAL OFFICER AND CHIEF COMPLIANCE OFFICER, ownership code NA, individual
Mar 30, 2021 to Mar 26, 2024factForm ADV
← SUNRIVER ADVISORS LLCOwnerGENERAL PARTNER, ownership code F, domestic entity
Sep 4, 2015 to Mar 26, 2024factForm ADV
← SUNRIVER GLOBAL LPOwnerMANAGING MEMBER, ownership code E, domestic entity
Sep 4, 2015 to Mar 26, 2024factForm ADV

Dated events

Occurred
Mar 26, 2024
Regulatory AUM changed
Sunriver Management Llc reported RAUM $1.0B, up 28% from $805.6M (2023-03-28 to 2024-03-26)
Form ADVobserved 5 days ago
$228M
Occurred
Mar 25, 2022
Regulatory AUM changed
Sunriver Management Llc reported RAUM $935.0M, up 36% from $687.8M (2022-01-07 to 2022-03-25)
Form ADVobserved 5 days ago
$247M
Occurred
Jan 7, 2022
Control person left
David Justin Morgan (Chief Operating Officer And Chief Compliance Officer - Registrant) no longer on Schedule A of Sunriver Management Llc (listed 2021-03-30, absent 2022-01-07)
Form ADVobserved 5 days ago
Occurred
Mar 30, 2021
Control person joined
Nmn John Stadnyk (Chief Financial Officer - Registrant) appeared on Schedule A of Sunriver Management Llc
Form ADVobserved 5 days ago
Occurred
Sep 4, 2015
First Form ADV filing
Sunriver Management Llc filed its initial SEC registration (Form ADV)
Form ADVobserved 5 days ago

Provenance

Graph: RIA / Wealth Management
Canonical id: dfx:ria:9b34f0fe-7132-38ec-8805-a4076efdfc84
First observed: Sep 4, 2015
Last observed: Mar 30, 2026 5 months ago
Source families: Federal regulator filings
3 registered feeds stand behind this record; each fact above carries its own dates and, where the publisher serves one, its document.
Resolution: Identity across graphs by shared identifier (CRD, CIK, EIN, ADV fund id, individual CRD) or citation; a name match is shown as a candidate and never merged.

SUNRIVER MANAGEMENT LLC

CRD 281277

GREENWICH, CT

This is the graph view. The full profile, with its team, deals and sources, is on RIA / Wealth Management.Open the full profile →

Search this name across graphsid dfx:ria:9b34f0fe-7132-38ec-8805-a4076efdfc84

Data as of Mar 30, 2026 (this record's last observation) from federal regulator filings. Page built Sep 20, 2026, 11:26 AM UTC and rebuilt at most every 15 minutes.

Fund

Type

Reported GAV

As of

Owners

First reported

Status

Form D file

SUNRIVER MASTER FUND LTD

Hedge Fund

$856M

Mar 26, 2024

Jan 13, 2016

reported

021-262009

SUNRIVER LONG MASTER FUND LTD

Hedge Fund

$177M

Mar 26, 2024

Mar 30, 2020

reported

021-371094

Owner

Title

Ownership code

Control person

Acquired

First seen

Last seen

COOK, RANDOLPH, WILLETT

MANAGING MEMBER

yes

07/2015

Sep 4, 2015

Mar 26, 2024

COOK, RANDOLPH, WILLETT

LIMITED PARTNER

yes

07/2015

Sep 4, 2015

Mar 26, 2024

COOK, RANDOLPH, WILLETT

FOUNDER AND PORTFOLIO MANAGER

yes

06/2015

Sep 4, 2015

Mar 26, 2024

STADNYK, JOHN, NMN

CHIEF FINANCIAL OFFICER AND CHIEF COMPLIANCE OFFICER

yes

01/2021

Mar 30, 2021

Mar 26, 2024

SUNRIVER ADVISORS LLC

GENERAL PARTNER

yes

06/2015

Sep 4, 2015

Mar 26, 2024

SUNRIVER GLOBAL LP

MANAGING MEMBER

yes

08/2015

Sep 4, 2015

Mar 26, 2024

Related person

Type

Class on the graph

Its RAUM

Control

Common control

State

SUNRIVER GP LLC

n/a

yes

n/a

Fiscal year

Filed

RAUM

Discretionary

Employees

Advisory staff

Offices

Private funds

Fund GAV

2025

Mar 30, 2026

$1.2B

n/a

2024

Mar 28, 2025

$1.2B

n/a

2023

Mar 26, 2024

$1.0B

2022

Mar 28, 2023

$806M

2021

Mar 25, 2022

$935M

2020

Mar 30, 2021

$688M

2019

Mar 30, 2020

$819M

2018

Mar 26, 2019

$728M

2017

Mar 30, 2018

$707M

2016

Mar 23, 2017

$683M

n/a

$683M

2015

Mar 25, 2016

$386M

n/a

$386M

Latest fiscal year

RAUM

A year earlier

1y change

Three years earlier

3y CAGR

Employees

A year earlier

Offices

A year earlier

2025

$1.2B

-2.3%

$806M

14.2%