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PESI · Industrials · Waste Management · Market cap $352M

2 funds in our archive have pitched PESI — most recently Long Cast Advisers Small- & Micro-Cap Concentrated Strategy in June 2026.

Company profile

Perma-Fix Environmental Services, Inc., operating through its various subsidiaries, functions as a U.S.-based company offering specialized expertise in environmental solutions and technology. Its operations are divided into three core divisions: Treatment, Services, and Medical. The Treatment division specializes in the handling, processing, and safe disposal of various waste types, including nuclear, low-level radioactive, mixed, hazardous, and non-hazardous materials, utilizing its dedicated treatment and storage facilities. Furthermore, this segment conducts research and development to devise and apply innovative methods for managing challenging waste streams. The Services division delivers extensive technical support, encompassing professional radiological assessments and site surveys for both government and commercial clients, alongside integrated occupational safety and health programs. Its offerings also include consulting, engineering, project and waste management, environmental remediation, and on-site decontamination and decommissioning (D&D) services, as well as providing specialized technical and managerial personnel. For the nuclear sector, it provides technology-driven solutions covering engineering, D&D, construction, logistics, transportation, processing, and disposal, in addition to undertaking the cleanup of licensed nuclear facilities and legacy sites. This segment further maintains an advanced laboratory for calibrating, maintaining, and sourcing a wide array of health physics, industrial hygiene, and custom nuclear, environmental, and occupational safety and health monitoring equipment. The Medical segment concentrates its efforts on the research and development of technologies for producing medical isotopes. Perma-Fix serves a diverse clientele, ranging from research institutions and commercial enterprises to public utilities and government bodies, engaging with them either directly or via third-party channels. Established in 1990, Perma-Fix Environmental Services, Inc. maintains its headquarters in Atlanta, Georgia.

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1
Reported positions
0
Bought
0
Sold
2
Letters

Position history

Between Q1 2026 and Q2 2026, 1 fund letter reported a position in PESI, with no move described.

Fund letters reporting a position in PESI, by quarter
QuarterLettersBoughtSoldTheses
Q2 20261001
Q1 20260001

Fund activity · 1 position

  • HoldsLong Cast Advisers Small- & Micro-Cap Concentrated Strategy
    June 2026
    Among our other large holdings, PESI recently preannounced 2Q26 earnings indicating continued weak profitability but strong backlog growth on expanding processing at Hanford.
    Read the letterPESI

Fund coverage · 2 theses

  • Long Cast Advisers Small- & Micro-Cap Concentrated Strategy
    June 2026

    PESI has growing backlog at Hanford and could benefit from a large long-term waste processing opportunity.

    Read the full thesis
  • White Brook Capital
    March 2026

    Perma-Fix Environmental is a hazardous waste and PFAS treatment company with a long-duration Hanford nuclear waste ramp and potential DOE contract wins plus PFAS optionality.

    Read the full thesis

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