Private company

CastleKnight Master Fund LP

Fund registered in the Cayman Islands, based in New York, active since 2020. Summary from the record

Last updated Oct 21, 2026.

Overview

HeadquartersNew York, United States²
Legal formMutual Fund²
Kind of organizationFund²
LEI549300TE4QR6L5VK7005²
StatusActive²
LEI statusIssued and current²
Registered addressC/O Maples Corporate Services Limited, KY1-1104 George Town, Cayman Islands²
Registered withCayman Islands Monetary Authority, 1814234²

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Corporate structure

CastleKnight Master Fund LP sits at the top of its group. 22 entities, 2 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

CastleKnight Master Fund LP New York, New York, United States
- AdvanSix Inc. Stake · Parsippany, New Jersey
- Advantage Solutions Inc. Stake · St. Louis, Missouri
- ALTA EQUIPMENT GROUP INC. Stake · Livonia, Michigan, United States
- AMC Global Media Stake · New York, New York, United States
- ASHFORD HOSPITALITY TRUST INC Stake · Dallas, Texas
- Babcock & Wilcox Stake · Akron, Ohio, United States
- Community Health Systems Stake · Attleboro, Massachusetts, United States
- Hain Celestial Group Stake · Hoboken, New Jersey, United States
- Innventure, Inc. Stake · Orlando, Florida
- KLX Energy Services Holdings, Inc. Stake · Houston, Texas
- Loyalty Ventures Inc. Stake · Plano, Texas, United States
- LSB INDUSTRIES, INC. Stake · Dover, Delaware, United States
- Nine Energy Service, Inc. Stake · Houston, Texas, United States
- Rent The Runway Stake · New York City
- STARZ ENTERTAINMENT CORP /CN/ Stake · Santa Monica, California
- SUJA LIFE, INC. Stake · Oceanside, California
- Sunnova Energy International Inc. Stake · Wilmington, Delaware, United States
- SunOpta Stake · Eden Prairie, Minnesota, United States
- Trinseo PLC Stake · Wayne, Pennsylvania
- TSAKOS ENERGY NAVIGATION LTD Stake · J3
- Upland Software, Inc. Stake · Austin, Texas, United States

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); stakes of 5% or more it reported on Schedules 13D and 13G (21 companies). Each entity in the chart links to its source.

Timeline

Sep 22, 2020Founded CastleKnight Master Fund LP is founded²

Stakes it holds

CastleKnight Master Fund LP has told the SEC it owns more than 5% of 21 companies, latest first (Schedules 13D and 13G).

SUJA LIFE, INC.SCHEDULE 13G Aug 28, 2026³
Advantage Solutions Inc.SCHEDULE 13G/A Mar 26, 2026 to Aug 14, 2026⁴
Hain Celestial GroupSCHEDULE 13G/A Mar 24, 2026 to Aug 14, 2026⁵
Innventure, Inc.SCHEDULE 13G/A Nov 15, 2024 to Aug 14, 2026⁶
KLX Energy Services Holdings, Inc.SCHEDULE 13G/A May 15, 2025 to Aug 14, 2026⁷
ALTA EQUIPMENT GROUP INC.SCHEDULE 13G Jul 10, 2026⁸
AMC Global MediaSCHEDULE 13G May 27, 2026⁹
Community Health SystemsSCHEDULE 13G/A Dec 26, 2023 to May 15, 2026¹⁰
SunOptaSCHEDULE 13G/A Nov 13, 2025 to May 15, 2026¹¹
AdvanSix Inc.SCHEDULE 13G May 14, 2026¹²
STARZ ENTERTAINMENT CORP /CN/SCHEDULE 13G Apr 17, 2026¹³
Nine Energy Service, Inc.SCHEDULE 13G Apr 9, 2026¹⁴
ASHFORD HOSPITALITY TRUST INCSCHEDULE 13G/A Jan 5, 2024 to Feb 17, 2026¹⁵
LSB INDUSTRIES, INC.SCHEDULE 13G/A Oct 10, 2025 to Feb 17, 2026¹⁶
TSAKOS ENERGY NAVIGATION LTDSCHEDULE 13G/A Oct 21, 2025 to Feb 17, 2026¹⁷
Trinseo PLCSCHEDULE 13G/A Dec 17, 2024 to Feb 17, 2026¹⁸
Rent The RunwaySCHEDULE 13G/A Mar 27, 2025 to Nov 14, 2025¹⁹
Babcock & WilcoxSCHEDULE 13G/A Sep 30, 2024 to Aug 14, 2025²⁰
Sunnova Energy International Inc.SCHEDULE 13G Mar 20, 2025²¹
Upland Software, Inc.SCHEDULE 13G/A Aug 8, 2024 to Feb 14, 2025²²
Loyalty Ventures Inc.SC 13G/A Nov 17, 2022 to Feb 15, 2023²³

Sources

The numbers on this page point here. Each one links to the record it came from.

1
SEC EDGARCastleKnight Master Fund LP filings on SEC EDGAR
2
GLEIFCastleKnight Master Fund LP LEI record (549300TE4QR6L5VK7005)
3
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G on SUJA LIFE, INC.
4
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on Advantage Solutions Inc.
5
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on Hain Celestial Group
6
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on Innventure, Inc.
7
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on KLX Energy Services Holdings, Inc.
8
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G on ALTA EQUIPMENT GROUP INC.
9
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G on AMC Global Media
10
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on Community Health Systems
11
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on SunOpta
12
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G on AdvanSix Inc.
13
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G on STARZ ENTERTAINMENT CORP /CN/
14
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G on Nine Energy Service, Inc.
15
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on ASHFORD HOSPITALITY TRUST INC
16
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on LSB INDUSTRIES, INC.
17
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on TSAKOS ENERGY NAVIGATION LTD
18
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on Trinseo PLC
19
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on Rent The Runway
20
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on Babcock & Wilcox
21
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G on Sunnova Energy International Inc.
22
SEC EDGARCastleKnight Master Fund LP SCHEDULE 13G/A on Upland Software, Inc.
23
SEC EDGARCastleKnight Master Fund LP SC 13G/A on Loyalty Ventures Inc.